46806005 - Ivy Design Analysis

AI-Assisted — The design is a carrier board for a Toradex Verdin system-on-module, fitted in M1 through a 260-position DDR4 SODIMM edge connector. The module supplies the processing, memory and most interface controllers. The carrier adds the following around it:

- power conversion
- two Gigabit Ethernet ports
- a USB 3.0 hub with Type-A and Type-C ports
- a full-size Mini PCIe socket for an LTE modem
- isolated fieldbus and analog I/O
- local storage and security devices

The schematic spans 21 sheets covering power, Ethernet, USB, LTE, CAN, RS-232, RS-485, ADC, digital inputs, relays, microSD, status LEDs and the I/O connectors. Field wiring lands on two 20-position 3.5 mm Weidmuller terminal blocks, J5 and J6, and a 2-position 3.5 mm terminal block, J3, rated 8 A. A 34-position 0.5 mm FFC connector, J15, carries a four-lane MIPI DSI display interface with backlight PWM, touch I2C and 1.8 V, 3.3 V and 5 V supplies. Two tactile push-buttons and fifteen status indicators, including four RGB LEDs, provide the local user interface.

Power Architecture

U12, a Texas Instruments LM5013 constant-on-time buck regulator, generates the 5V rail through L14. The LM5013 accepts 6 V to 100 V input and delivers up to 3.5 A, per the Texas Instruments LM5013 datasheet (Datasheet). U10, a TPS62823 2.2 MHz buck, generates 3V3 through L11.

Five AP2132 LDOs produce the board's lower rails:

- U9 produces the 1.2 V rails for the USB hub: DVDD12 directly, AVDD12 through L7, and NetC64_2 through R23.
- U29 produces 2V5.
- U30 produces 1V0_ETH.
- U32 produces MPCI1_1V5 for the Mini PCIe socket.
- U65 produces 1V8_SW.

Two AP2202 LDOs, U41 and U42, generate the 3V2_AIN1 and 3V2_AIN2 rails for the two isolated analog front ends.

Current-limited load switches gate the downstream 5 V supplies. U64 sources +V5_SW, U68 sources TOP_5V, and U14, a BD2222G, sources USB_1_VBUS through L17. A third AP22653, U35, is also fitted.

Input protection uses an SMAJ33CA bidirectional TVS (33 V standoff), together with an SDT15H50P5 15 A Schottky rectifier and an SK510A 5 A Schottky diode. A 1220-size coin-cell holder, XS1, maintains the VBAT backup rail.

Six UCC12040 isolated DC/DC converters, U18, U19, U44, U46, U49 and U53, create the floating supply domains:

- 5V_CAN1 and 5V_CAN2, with GND_CAN1 and GND_CAN2
- 5V_AIN1 and 5V_AIN2, with GND_AIN1 and GND_AIN2
- VCC_232, with GND_232
- 5V_485, with GND_485

The UCC12040 is certified basic insulation per DIN V VDE V 0884-11, with an 850 VRMS continuous working voltage and a 3000 VRMS withstand to UL 1577, per the Texas Instruments UCC12040 datasheet (Datasheet).

Ethernet

The board provides two RJ45 ports on Pulse JXD0-0025NL integrated-magnetics jacks, J7 and J10.

- The first port carries the Verdin module's native 1000BASE-T MDI pairs.
- The second port is driven by U26, a Texas Instruments DP83867E Gigabit PHY. U26 connects to the module over RGMII, with MDIO management, and is clocked from a 25 MHz crystal, Y2.

The PHY straps resolve to PHY address 2, auto-negotiation enabled, 10/100/1000 advertisement, RGMII mode and active-high LED drive. The DP83867E supports cable lengths up to 130 m and operates from −40 °C to 105 °C, per the Texas Instruments DP83867E datasheet (Datasheet).

USB

U8, an Infineon CYUSB3304 four-port USB 3.0 hub, is clocked from a 26 MHz crystal, Y1. Its mode-select straps choose internal ROM configuration, and downstream port power is controlled in ganged mode, per the Infineon CYUSB3304 datasheet, page 23 (Datasheet).

Hub downstream ports serve the following:

- the USB 3.1 Type-A connector J16
- the USB 2.0 lines of the Mini PCIe socket

A GCT USB4105 Type-C receptacle, J4, carries the module's USB_1 OTG port. U13, a TUSB320LI CC controller, manages J4 in dual-role mode, with I2C disabled (GPIO mode). Four-channel DT1240 TVS arrays protect the high-speed connector lines.

Cellular

J8 is a full-size Mini PCIe socket for an LTE modem. It is supplied from the MPCI1_3V3 and MPCI1_1V5 rails and is paired with a nano-SIM socket, J9, with card detect.

Industrial Interfaces

Two TCAN1044V-Q1 CAN FD transceivers, U22 and U23, operate at up to 8 Mbps on separately isolated domains. Each sits behind ISO6721RB digital isolators, with ESDCAN06-2BWY bus TVS protection. The transceivers' bus pins tolerate ±58 V, per the Texas Instruments TCAN1044V-Q1 datasheet (Datasheet).

The serial ports are also isolated:

- An ST3232 transceiver, U56, provides an isolated RS-232 port.
- An SN65176B transceiver, U52, provides an isolated half-duplex RS-485 port, rated −40 °C to 105 °C per the Texas Instruments SN65176B datasheet (Datasheet).
- PESD15VL2BT TVS arrays protect the serial lines.

Two ADS1119 16-bit, four-channel delta-sigma ADCs, U39 and U40, sit at I2C addresses 0x40 and 0x41 behind ISO1644 I2C isolators. Each ADC runs at 20 SPS to 1000 SPS from a 2.048 V internal reference, per the Texas Instruments ADS1119 datasheet (Datasheet). TPS26614 current-loop protectors and PSSI2021SAY constant-current sources condition the analog inputs.

Digital inputs are isolated by TLP185 optocouplers. Four TLP241A photorelays, PR1 to PR4, provide SPST-NO solid-state outputs rated 2 A at 40 V. SN74AXC8T245 and PCA9306 level translators bridge the module's 1.8 V I/O to the 3.3 V peripherals.

Storage, Security and Monitoring

The board's storage, security and monitoring devices are:

- J12, a push-push microSD socket on the module's 4-bit SD interface.
- U3, an Infineon SLM9670 TPM 2.0, on the SPI bus.
- U6, an MB85RS256 256 Kbit FRAM, on the same SPI bus.
- U5, an M24C02 2 Kbit EEPROM, at I2C address 0x57.
- U7, a TMP1075 temperature sensor, at I2C address 0x4F.

Temperature Rating

Most fitted semiconductors are rated −40 °C to 85 °C or wider. The CYUSB3304-68LTXI is rated −40 °C to 85 °C, while the PHY, TPM and RS-485 transceiver extend to 105 °C. The CAN transceivers, isolated converters and ADCs extend to 125 °C. The TL3340 tactile switches, S1 and S2, rated −35 °C to 85 °C, set the narrowest component range on the board.

AI-Assisted — Power enters on J3 (Molex 0395061002), J3_2 on V+ and J3_1 on V-. The stated operating range is 21-72 V, 48 V nominal. The designer's note on 100_Power gives 8-72 V / 2 A for the extended version and 8-32 V / 2 A for the standard version.

The analyzed build is the 46801015 Ivy Plus variant. It fits D1 as SMAJ70CA-TP in place of the library SMAJ33CA-E3/5A. The 46801005 Ivy variant keeps the SMAJ33CA and depopulates U12 with its parts.

D1 sits across V+ and V- at the connector, on the unfused side of F1 (5 A slow-blow, 125 V AC/DC). The 70 in its part number is a 70 V standoff class, below the 72 V top of the range. Its breakdown voltage is not in the data, so whether it reaches breakdown at 72 V was not checked.

After F1, V1 passes through D2 (SK510A-LTP, reverse-polarity block), the C80 feedthrough and one winding of L12 (CM3421Y600R-10, 15 A) to VIN. V- returns to GND through the other winding. VIN has four loads:
- C69, L10 and U12.
- The D4 LED, through R41 and R43.
- J5_17 and J5_18, as PWR1 and PWR2 through PTC8 and PTC7.
- D26 and D23, which clamp PWR1 and PWR2. In Ivy Plus these clamps are still SMAJ33CA.

U12 (LM5013) makes 5V. 5V feeds the Verdin module as VT (through C3 and L2), the six UCC12040 isolated converters, U13, U14, U64, U68 and the AP2132 control inputs. U10 (TPS62823) makes 3V3 from 5V. 3V3 feeds AVDD33, MPCI1_3V3 (L27 and L28 in parallel), U9, U29, U30 and U65. U32 makes MPCI1_1V5 from MPCI1_3V3.

The power-up order is:
1. J3 is powered. U12 starts, with EN held at VIN by R30, and 5V rises over the 3.5 ms soft-start.
2. VT powers M1. The UCC12040 converters, U13, U14's input and the AP2132 control inputs come up with 5V.
3. M1 supplies 1V8 from PWR_1V8_MOCI through L3. It also drives CTRL_PWR_EN_MOCI through R5 onto PWR_EN, which R27 (100 kΩ) holds low until then. PWR_EN enables U10 and U64. The relative timing of these two module outputs is set by the module.
4. 3V3 rises in 1.25 ms. U29, U30, U9 and U32 already have their enables high, so they follow their inputs.

AI-Assisted — U12 is a constant-on-time buck (TI LM5013 datasheet). It is fed from VIN through C69 and L10 onto NetC70_2, where C70, C72, C75, C76, C78 and C79 form the input bank. R30 holds EN/UVLO at VIN, so U12 runs whenever VIN exceeds its 6 V minimum. PGOOD is unused.

The R44/R45/R46 divider, against the 1.2 V reference, sets 5.080 V. R33 and R34 in parallel give 43.3 kΩ on RON, which sets 293 kHz.

Ripple for the COT comparator comes from a Type 3 network: R42 (86.6 kΩ) from SW, C93 (2.2 nF) to 5V and C90 (100 pF) into FB. With RA × CA = 190.5 µs, the injected ripple is 69 mV at 21 V and 85 mV at 72 V.

L14 (Eaton DR127-150-R, 15 µH) has a ripple of (VIN − VOUT) × tON / L. That is 0.88 A at 21 V and 1.07 A at 72 V. The peak at the 3.5 A maximum output is 4.04 A, against a 9.66 A saturation current.

The output bank on the U12 sheet is six 22 µF 16 V X5R 0805 capacitors, 132 µF nominal. DC-bias loss is not applied, because the part has no bias curve in the data. The 5V rail carries 244.4 µF in total.

The freewheel diode D3 (Diodes SDT15H50P5 datasheet) is oriented correctly. However, its 50 V VRRM is below the 72 V that SW reaches. The LM5013 datasheet requires a reverse rating above VIN maximum + 25%, which is 90 V.

VT feeds the Verdin module through the C3 feedthrough and L2. Its five 22 µF 6.3 V capacitors keep only about 3.96 µF each at 5.08 V (Murata DC bias characteristic, p.5).

The known 5V load is about 0.88 A:
- 0.30 A for the six UCC12040 at no load (TI UCC12040 datasheet p.7).
- At least 0.58 A into U10.
- 2 mA for four AP2132 control inputs.
- Divider and LED paths.

This excludes M1, U13, the U14 and U68 USB port loads, the U64 display supply and the UCC12040 load current.

AI-Assisted — U10 is a 2.2 MHz synchronous buck (TI TPS62823 datasheet). It takes 5V through the C67 feedthrough and the L8 ferrite (600 Ω, 2.5 A, 50 mΩ; Würth 78279221601 datasheet) onto NetC71_2.

C71 and C74 decouple that node with 44 µF nominal, against the 4.7 µF the datasheet asks for. The worst-case input, 5.24 V at the 5V tolerance corner, is inside the 5.5 V maximum.

R36 + R37 (54 kΩ) over R38 (12 kΩ), against the 0.6 V reference, set 3.300 V. With reference and 1% resistor tolerances this spans 3.21-3.39 V. C83 (100 pF) across the upper leg places a feed-forward zero at 29.5 kHz.

L11 is a 1 µH Bourns SRP3212 (Datasheet), which the datasheet supports as an alternative to 470 nH.

The output capacitors C86, C88, C89 and C91 are 22 µF 6.3 V 0402 parts. At 3.3 V they keep about 30% of nominal, about 26.7 µF effective for the bank.

PWR_EN enables U10 together with U64. R27 holds that net low until M1 drives CTRL_PWR_EN_MOCI through R5, so every 3V3 load starts after the module. PG and pin 4 are unused, as the datasheet permits.

The known 3V3 load is about 0.89 A, against U10's 3 A rating:
- 286 mA for the CYUSB3304 3.3 V supplies (Infineon CYUSB3304 datasheet p.37).
- 526 mA for the CYUSB3304 1.2 V supplies, drawn through the linear U9.
- 13 mA for the four TLP241A relay LEDs.
- 7 mA for D10-D13.
- A 55 mA upper bound for the J7 jack LEDs.

This excludes the Mini PCIe card on MPCI1_3V3, the DP83867E draw through U29 and U30, the isolators and translators, J10 and the DSI supply.

MPCI1_3V3 carries 682.3 µF, from two 330 µF polymer capacitors behind L27 and L28. In total 3V3 charges about 905 µF at start-up. Over the 1.25 ms soft-start that is 905 µF × 3.3 V / 1.25 ms ≈ 2.4 A, on top of the load.

AI-Assisted — U14 switches 5V onto the J4 Type-C VBUS for the OTG port (ROHM BD2222G datasheet).

Its input is NetC104_2, reached through the L15 ferrite and decoupled by C104 (22 µF). Its output passes the L17 ferrite to USB_1_VBUS. That net carries C107 (4.7 µF), C108 (100 nF), the D32 TVS, R64 to the U13 VBUS detect input, and the R65/R63 path to M1.

EN is USB1_EN_3V from U48 pin B4 on the 3V3 side of the translator. The port can therefore be enabled only after M1 has raised PWR_EN, and that net has no pull resistor.

R62 (27 kΩ) on ILIM sets the current limit:
- Ith(typ) = 19364 × 27^−0.98 = 766 mA.
- Ith(min) = 0.98 × 766 − 96 = 655 mA.
- Ith(max) = 1.02 × 766 + 96 = 877 mA.

These match the designer's 0.77 A note. USB1_OC# is pulled up by R61 (27 kΩ) to 1V8 and read by M1.

At the 877 mA maximum limit, U14's on-resistance is taken as 146 mΩ. That is the 120 mΩ 25 C maximum, scaled by the 1.22 typical ratio from the On-Resistance vs Ambient Temperature graph (p.7). U14 then dissipates 0.112 W. The 5.4 mW/C derating corresponds to 185 C/W, giving a 21 C rise to about 106 C at 85 C ambient. The datasheet states no junction maximum, so the 115 C limit governs.

VBUS1_SNS is not a 1 V level. R65 (274 Ω) and R63 (27 kΩ) give a ratio of 0.990, so M1 pin 159 sees about 5.03 V.

D32 (Diodes D5V0L1B2S9) is bidirectional, so there is no orientation to check. Its 5 V standoff is below the 5.5 V Type-C VBUS maximum, but the 6 V minimum breakdown is still above it.

AI-Assisted — U29 and U30 take their input from 3V3 through the L26 ferrite onto NetC158_2 (C158 and C159, 44 µF). Their control supply and enable come from 5V through R125 and R126 (120 Ω each), with no capacitor on either VCTRL node. Both enables are therefore high as soon as 5V exists, and each output rises when 3V3 arrives.

The output is VOUT = 0.8 × (R1 + R2) / R2 (Diodes AP2132B datasheet
- R127 (100 kΩ) over R128 (47 kΩ) sets 2V5 at 2.502 V.
- R129 (12 kΩ) over R130 (47 kΩ) sets 1V0_ETH at 1.004 V.

The 620_Ethernet2 sheet states 2.502 V, which matches, and 1.042 V, which the drawn resistors cannot produce.

Across the 0.784-0.816 V reference band and 1% resistors, 2V5 spans 2.42-2.59 V and 1V0_ETH spans 0.98-1.03 V. Both are inside the DP83867E recommended VDDA2P5 and VDD1P0 ranges (TI DP83867E datasheet, p.9).

U29 has 0.8 V of headroom; U30 drops 2.3 V. With θJA of 53 C/W, 85 C ambient and a 115 C junction limit, U29 can deliver 0.71 A and U30 0.25 A. The DP83867E datasheet gives total power but not the per-rail current.

The PHY's 1.8 V analog supply comes from 1V8, which M1 supplies from PWR_1V8_MOCI. VDDA2P5 follows U10, so the order between the two is set by the module's output timing. The DP83867E constrains that order.

The output banks hold 34.2 µF on 2V5 and 36.4 µF on 1V0_ETH. Every PHY supply pin has 1 µF and 100 nF.

AI-Assisted — U32 supplies MPCI1_1V5 from MPCI1_3V3 to the J8 Mini PCIe pins 6, 28 and 48. Its enable sits directly on MPCI1_3V3. VCTRL is fed from 5V through R138 (60.4 Ω), with C176 (22 µF) as the control-supply capacitor. U32 therefore follows the MPCI1_3V3 ramp after M1 raises PWR_EN.

R149 (10 kΩ) over R150 (12 kΩ) sets 0.8 × 22 / 12 = 1.467 V, matching the designer's 1.47 V note. The reference band and 1% resistors give a range of 1.424-1.510 V.

The only output capacitor is C180 (22 µF 6.3 V X5R 0402). On the Murata DC bias characteristic (p.5) it keeps about 14.1 µF at 1.5 V.

Headroom is 1.83 V. At θJA of 53 C/W and 85 C ambient, the 115 C junction limit allows 0.31 A. The card's 1.5 V current leaves the board through J8 and is not stated.

C176 is a 6.3 V part on the 5 V control node. It is included in the 6.3 V capacitor finding.

AI-Assisted — U41 and U42 are 150 mA LDOs that supply the two isolated analog input channels (Diodes AP2202 datasheet, source: Tomachie). Each takes its input from the 5.0 V output of a UCC12040 isolated converter: U44 drives 5V_AIN1 and U46 drives 5V_AIN2, both with SEL tied to VISO. EN sits on the same node, so each LDO starts once its converter output rises after 5V. The outputs return to GND_AIN1 and GND_AIN2.

The 1.25 V reference sits between VOUT and ADJ. R165 (6.49 kΩ) and R167 (10 kΩ) set 1.25 × (1 + 10/6.49) = 3.176 V; R164 and R166 do the same for U42. This matches the designer's 3.18 V note on 840_ADC. The ±2% accuracy over temperature gives 3.11-3.24 V, inside the ADS1119 AVDD range of 2.3-5.5 V.

C190 and C189 (100 pF) from ADJ to the isolated ground are the optional bypass capacitor. With it fitted, the minimum output capacitance is 2.2 µF. C191 and C192 (22 µF 16 V X5R) with five 100 nF parts exceed that at nominal value; DC-bias loss is not applied.

The datasheet's stable-ESR graphs stop at 4.7 µF, so a 22 µF all-ceramic output lies outside the characterised region.

The known load is about 0.6 mA from U39 or U40 and the feedback divider. The I2C and DRDY pull-ups add up to 2.04 mA while those lines are low. U43, U45, U37 and U38 have no stated supply current on these rails.

At 200 C/W, with a 1.82 V drop and 85 C ambient, each LDO can deliver 82 mA before its junction reaches the 115 C limit.

AI-Assisted — U64 switches 5V onto +V5_SW for the display (Diodes AP22653A datasheet). Its input is NetC241_2, fed from 5V through the L34 ferrite and decoupled by C241. +V5_SW feeds J15 pins 26-29 and the VCTRL and EN pins of U65.

EN shares PWR_EN with U10, so the display supply comes up with the carrier 3V3 domain after M1 drives CTRL_PWR_EN_MOCI. AP22653A is the latch-off version. An overcurrent that persists through the 6 ms deglitch turns the switch off until EN is toggled or power is cycled.

R206 (10 kΩ) sets the current limit to 2478-2852 mA at 25 C, and 2398-2931 mA over -40 to 85 C (p.5). The designer's note on 810_AUX_Connectors gives Ilim = 2.1 A. That figure is the switch's recommended maximum continuous current, not the 10 kΩ limit.

L34 carries the whole switch current and is rated 1.7 A in its library description. A display load between 1.7 A and 2.4 A therefore flows through L34 indefinitely without U64 acting.

+V5_SW holds 44.5 µF: C240, C243 and five 100 nF parts. J15 is a display FFC connector, so the datasheet's 120 µF USB output requirement does not apply. FAULT (U64_4) is unconnected.

At the 135 mΩ maximum on-resistance and 120 C/W JEDEC high-K thermal resistance, 85 C ambient allows 1.36 A continuous before the junction reaches 115 C. The J15 5 V current is not stated.

AI-Assisted — U65 makes 1V8_SW for the J15 display's 1.8 V and IO_VREF pins (Diodes AP2132B datasheet). Its input is 3V3 through the L33 ferrite onto NetC239_2, decoupled by C239.

VCTRL and EN sit directly on +V5_SW, so U65 runs only while U64 is on. U10 and U64 both start from PWR_EN, and 1V8_SW follows whichever of 3V3 and +V5_SW comes up later. The 44.5 µF on +V5_SW decouples VCTRL.

R203 (4.7 kΩ) over R204 + R205 (3.74 kΩ) sets 0.8 × 8.44 / 3.74 = 1.805 V, matching the designer's 1.805 V note. The 0.784-0.816 V reference band and 1% resistors give 1.75-1.86 V.

C242 keeps about 12.3 µF at 1.8 V (Murata DC bias characteristic p.5, Datasheet). Together with C247 and C249 it exceeds the 10 µF typical application figure.

The drop is 1.5 V. At 53 C/W and 85 C ambient, the 115 C junction limit allows 0.38 A. R200, R207, R208, R210 and the feedback divider draw at most 2.5 mA together. The display's own 1.8 V current leaves the board through J15 and is not stated. PG is unused.

AI-Assisted — U68 switches 5V onto TOP_5V, the VBUS of both J16 Type-A host ports (Diodes AP22653A datasheet). Its input NetC253_2 is fed from 5V through L1 and L40 in parallel and decoupled by C253 (22 µF 16 V).

R213 + R216 (13.6 kΩ) set the limit to 1751-2104 mA, 1931 mA typical, by the datasheet equations on p.10. This matches the designer's 1900 mA note.

At the maximum limit, equal sharing puts about 1.05 A into each bead. The 48-80 mΩ DCR spread puts at most about 1.31 A into the lower-resistance bead, within its 1.7 A rating.

EN is the PWR_USB net. R223 (27 kΩ) pulls it up to NetC253_2, and Q11 channel 2 pulls it low; that channel's gate is PWR_EN# and its drain is PWR_USB. Q11 channel 1 has USB2_EN from M1 on its gate and PWR_EN# on its drain. R16 pulls PWR_EN# up to 3V3, and U8 PWR_EN drives it.

With 3V3 present, TOP_5V is on when USB2_EN is high or U8 holds PWR_EN# low; this is an OR of the module's and the hub's port enables. Before PWR_EN raises 3V3, R16 has no supply and PWR_EN# sits low. In that state R223 turns U68 on as soon as 5V rises.

FAULT drives FAULTn, which reaches U8 OVRCURR through R217 (0 Ω), with R15 to 3V3. C255 (330 µF polymer) and C258 (100 nF) form the output bank, and D31 clamps TOP_5V.

The thermal limit stated for U64, 1.36 A continuous at 85 C ambient, applies here as well.

AI-Assisted — U9 makes DVDD12 for the CYUSB3304 hub (Diodes AP2132B datasheet). Its input is 3V3 through the L6 ferrite onto NetC58_2, decoupled by C58. VCTRL and EN sit on 5V, so U9 follows 3V3 after PWR_EN.

AVDD12 is DVDD12 through the L7 ferrite. VDD_EFUSE (NetC64_2) is DVDD12 through R23 (0 Ω). R22, from 2V5 to NetC64_2, is marked do-not-install.

R24 (10 kΩ) over R25 + R26 (20 kΩ) sets 0.8 × 30 / 20 = 1.200 V, matching the designer's note on 500_USB_Hub. The reference band and 1% resistors give 1.168-1.232 V. That is inside the 1.14-1.26 V DVDD12 and AVDD12 range (Infineon CYUSB3304 datasheet p.37, Datasheet).

C17 and C66 each keep about 16.2 µF at 1.2 V (Murata DC bias characteristic p.5), above the 10 µF typical application figure.

The hub's 1.2 V supplies draw 410 mA typical and 526 mA maximum combined (p.37). From a 3.3 V input, U9 dissipates 2.1 V × 0.526 A = 1.105 W.

At 53 C/W (2-layer board with a 1 cm² pad), the junction reaches 85 + 58.6 = 143.6 C, or 130.6 C at the typical current. Both exceed the 115 C limit. Meeting it at the maximum current needs a thermal resistance of 27 C/W or less.

L7 sits outside the feedback loop. With its 80 mΩ maximum DCR, AVDD12 stays at or above 1.14 V at the low setpoint only while the AVDD12 share stays below 0.35 A.

AI-Assisted — The two highest-risk items sit at the 48 V input, and both arise from the extended 72 V range. D3, U12's freewheel diode, is a 50 V part on a switch node that swings to the full input voltage. D23 and D26 (SMAJ33CA) conduct continuously on PWR1 and PWR2 at any input above about 37 V. The Ivy Plus variant changes D1 but neither of these.

At the same node, D1 sits unfused at the connector. F1 (5 A) does not protect L10 (2.5 A). PTC7 and PTC8 are 60 V parts, and the 100 V ceramics exceed the 30% derating above 70 V.

U9 is the hottest linear stage: about 1.1 W at the hub's maximum 1.2 V current, with a predicted 143.6 C junction at 85 C ambient. U64 and U68 can pass up to 2.93 A and 2.10 A before their current limits act, but reach the 115 C junction limit at 1.36 A in SOT-26. U12's dissipation is not computed, because its datasheet has efficiency curves only for a 12 V output.

The 5V budget is open. The switch limits alone (U14 0.88 A, U68 2.10 A, U64 2.93 A maximum) admit 5.9 A against U12's 3.5 A rating, before counting M1, the hub and the isolated converters. On 3V3, the known 0.89 A already approaches the 1 A in the designer's note, before the Mini PCIe card, the PHY and the display.

Sequencing is set by the module:
1. VT reaches M1 directly from 5V.
2. M1 supplies 1V8 and releases PWR_EN.
3. 3V3, the PHY LDOs, the display supplies and the hub follow.

TOP_5V turns on with 5V, before M1 and the hub are powered, and turns off when 3V3 rises until a port enable asserts.

Two designer notes disagree with their circuits: 1.042 V for 1V0_ETH and Ilim = 2.1 A for U64. VCC_232 is a 5.0 V rail despite its name. The FAULT outputs of U35 and U64 are unconnected, and U6's 1.8 V supply minimum equals 1V8C's nominal voltage.

AI-Assisted —

#	Device	Rail	Observation	Severity
4.8.1	D23, D26 (SMAJ33CA-E3/5A)	PWR1, PWR2	PWR1 and PWR2 carry VIN through PTC8/PTC7, at 48 V nominal and up to 72 V. The SMAJ33CA breakdown is 36.7 V minimum at 1 mA (Eaton SMAJ datasheet p.3), below 48 V, so both parts are in breakdown in normal operation. A TVS is a pulse device and is not rated for continuous conduction. Its current is limited only by the PTC until the PTC trips, so PWR1/PWR2 cannot hold VIN above about 37 V. Ivy Plus changes D1 to SMAJ70CA-TP but not D23/D26. Fix: fit a TVS whose standoff covers 72 V as an ALT in the same variant.	High
4.8.2	D3 (SDT15H50P5-13)	NetC85_1	This is the U12 freewheel diode, with cathode pin 3 on SW and anode pins 1-2 on GND; orientation is correct. It is a 50 V VRRM part (Diodes datasheet p.2). Each on-time, the SW node applies the full VIN in reverse, up to 72 V at the top of the V+ range, so the part is not rated for this position. Even at 48 V nominal, its 20% derated limit is 40 V. The TI LM5013 datasheet (p.11, p.16) requires a Schottky whose reverse breakdown exceeds VIN maximum + 25% (90 V) and whose current rating exceeds the maximum DC output. Fix: a 100 V-class Schottky rated for 3.5 A in the same PowerDI5 body, which meets both and keeps the footprint. Its higher forward drop sets its dissipation.	High
4.8.3	D1 (SMAJ70CA-TP, Ivy Plus ALT)	V+	D1 is across V+ and V- at J3_2/J3_1, on the connector side of F1, so the clamp and its fault current are not protected by the fuse. If D1 fails short after a surge, the input is shorted with no series protection. Fix: reorder so J3_2 feeds F1 first and D1 clamps the fused node.	Medium
4.8.4	F1 (5A Slow, 0680L5000-05)	V1, VIN	F1 is rated 5 A. L10 carries all of U12's input current and is rated 2.5 A (Würth 78279221601 datasheet, 40 K rise). A fault downstream of L10 can pass more than L10's rating without opening F1. Fix: a fuse of 2.5 A or less, which still carries the 2 A input stated in the designer's note on 100_Power, or an L10 rated above 5 A.	Medium
4.8.5	C69, C80 (YFF31HC2A105MT000N, 1 µF 100 V feedthrough)	VIN, NetC80_1	Each is a 100 V part with up to 72 V applied, which its rating meets. Derated 30% (capacitor_voltage_pct = 70) in the Benign (controlled office) derating selected for this schematic analysis, it permits 70 V, so under that derating the part is unsuitable. No higher-rated part exists in this 1206 feedthrough body. Fix: a different, larger part. This changes the footprint and must be decided before layout begins.	Medium
4.8.6	C70, C72, C75, C76, C78, C79 (CC1206KKX7R0BB225, 2.2 µF 100 V X7R)	NetC70_2	Each is a 100 V part with up to 72 V applied, which its rating meets. Derated 30% (capacitor_voltage_pct = 70) in the Benign (controlled office) derating selected for this schematic analysis, it permits 70 V, so under that derating the part is unsuitable. Fix: a higher-rated 2.2 µF part, which needs a larger body and so changes the footprint; decide before layout. The TI LM5013 datasheet (p.20) prefers a rating of twice maximum VIN; that is a preference, not a requirement.	Medium
4.8.7	PTC7, PTC8 (0ZCG0010FF2C)	VIN, PWR1, PWR2	Rated 60 V DC maximum (Bel Fuse datasheet). A short on J5_17 or J5_18 puts VIN, up to 72 V, across the tripped PTC, so the part is not rated for this position. Fix: a PPTC rated at least 72 V with the same hold/trip coordination for the extended input range.	Medium
4.8.8	R41, R43 (6.49 kΩ 0805 0.25 W)	VIN	At 72 V the D4 path carries (72 V − 2.1 V) / 12.98 kΩ = 5.39 mA, using the APT1608CGCK typical VF (Kingbright datasheet). That is 0.188 W in each resistor, which the 0.25 W rating meets. Derated 30% in the Benign (controlled office) derating selected for this schematic analysis, it permits 0.175 W, so under that derating the part is unsuitable. Fix: two 10 kΩ resistors, giving 3.5 mA and 0.122 W each at 72 V in the same footprint, with D4 still lit at about 0.95 mA at 21 V.	Medium
4.8.9	C4, C5, C6, C7, C8, C123, C124, C176, C241, C243 (GRM155R60J226ME11D, 22 µF 6.3 V)	VT, 5V_CAN1, 5V_CAN2, NetC176_2, NetC241_2, +V5_SW	Each is a 6.3 V part with 5.08 V applied (5 V rail), which its rating meets. Derated 30% (capacitor_voltage_pct = 70) in the Benign (controlled office) derating selected for this schematic analysis, it permits 4.41 V, so under that derating the part is unsuitable. The Murata DC bias characteristic (p.5) also shows −82% at 5.08 V, about 3.96 µF per part, so the five VT capacitors give about 20 µF. Fix: a 16 V 22 µF 0805 part such as the CL21A226MOQNNNE already used on 5V, which meets the derating. This changes the footprint and must be decided before layout.	Medium
4.8.10	L34 (330 Ω 0603, 1.7 A), U64	NetC241_2, +V5_SW	U64 is the current limiter for this path. Its limit (2.40 A minimum, 2.93 A maximum over temperature) sits above the 1.7 A rating of L34, which carries the whole switch current. A display load between 1.7 A and 2.40 A therefore flows through L34 continuously without U64 acting, and a short passes up to 2.93 A for the 2-20 ms latch-off deglitch. Fix: a ferrite rated above 2.93 A, or RLIM of at least 16.7 kΩ so the maximum limit falls below 1.7 A. 18 kΩ gives 1.30-1.58 A by the p.10 equations, if the J15 display draws less than that.	Medium
4.8.11	U9 (AP2132BMP-2.5TRG1)	DVDD12	The CYUSB3304 1.2 V supplies draw 526 mA maximum (410 mA typical) (Infineon CYUSB3304 datasheet p.37). From 3.3 V, U9 dissipates 2.1 V × 0.526 A = 1.105 W. At 53 C/W (Diodes AP2132B datasheet p.4) and 85 C ambient, the predicted junction is 143.6 C (130.6 C typical). Under the Benign (controlled office) derating selected for this schematic analysis, the junction may not exceed 115 C, so the part is unsuitable in this position. The limit needs a θJA of 27 C/W or less (copper area and thermal vias), or a lower input-to-output difference, such as a 1.2 V switching regulator.	Medium
4.8.12	U30 (AP2132BMP-2.5TRG1)	1V0_ETH	The 620_Ethernet2 sheet states 1.042 V, but R129 (12 kΩ) over R130 (47 kΩ) gives 0.8 × 59 / 47 = 1.004 V. 1.042 V would need R129/R130 = 0.3025, for example 14.3 kΩ over 47 kΩ. Either the note or a resistor value is wrong. Both voltages are inside DP83867E VDD1P0 (0.95-1.155 V).	Low
4.8.13	U64 (AP22653AW6-7), R206	+V5_SW	The designer's note on 810_AUX_Connectors states 'Rlim = 10K, Ilim = 2.1A'. R206 (10 kΩ) gives 2478-2852 mA at 25 C and 2398-2931 mA over -40 to 85 C (Diodes AP22653A datasheet p.5, Datasheet). 2.1 A is the recommended maximum continuous current (p.4), not the limit 10 kΩ sets. The note and R206 disagree. A 2.1 A typical limit needs about 12.7 kΩ, which gives 2.08 A typical by the p.10 equation.	Low
4.8.14	D1, U12 (LM5013DDAR)	V+, VIN	U12 VIN has a 100 V absolute maximum (TI LM5013 datasheet p.5). Check that D1 clamps below 100 V at U12. Include the hot-plug overshoot of a 72 V source into the all-ceramic input (C69, C70-C79; the LM5013 datasheet p.17 and p.20 says a damping capacitor may be needed for a long harness). Inputs above 72 V also call for at least 22 µH at L14 (p.19); L14 is 15 µH. The D1 clamping voltage was not available at report generation time.	Review
4.8.15	F1	V1	F1 is a 125 V-rated fuse carrying 48 V nominal and up to 72 V. This design is not being assessed against NASA EEE-INST-002. If it were, that document stipulates that a 125 V-rated fuse carry no more than 50 V, because enduring arcs have been observed above that (EEE-INST-002 Section F3 Table 4 note 5).	Review
4.8.16	U12	5V	U12 is rated 3.5 A maximum output (TI LM5013 datasheet p.6); the designer states 2.5 A for the extended version. The known 5V load is about 0.88 A: six UCC12040 at 0.30 A no-load, U10 at least 0.58 A, and the control inputs, dividers and D6 together 3 mA. That excludes M1, U13, the USB port loads, U64 and the UCC12040 load current. The USB limits alone admit up to 2.78 A (U14 0.877 A maximum; U68 1.9 A per the designer's note), which with the known load reaches 3.66 A. Check that the worst-case total stays below 2.5 A.	Review
4.8.17	L2 (78279221601)	VT	L2 permits 2.5 A (Würth datasheet; flat to 85 C on its derating curve). VT feeds only M1, whose current is not stated. Check that the M1 peak VCC current stays below 2.5 A.	Review
4.8.18	U10	PWR_EN	U10 EN has VIH = 1.0 V minimum (TI TPS62823 datasheet p.5). It is driven by M1 CTRL_PWR_EN_MOCI through R5 and held low by R27 until then. Check that the M1 CTRL_PWR_EN_MOCI VOH is compatible with 1.0 V at U10 and with the 1.5 V VIH of U64 on the same net.	Review
4.8.19	U10	3V3	U10 is rated 3 A (TI TPS62823 datasheet p.4). The known 3V3 load is 0.89 A: U8 0.81 A, relay and status LEDs 20 mA, and J7 LEDs 55 mA upper bound. That excludes J8, U26 through U29/U30, the isolators and translators, J10 and U65. Check that the total stays below 3 A.	Review
4.8.20	L8 (78279221601)	NetC71_2	L8 permits 2.5 A (Würth datasheet). The known U10 input current is at least 0.58 A (0.89 A × 3.3 V / 5.08 V). At U10's full 3 A it reaches 1.95 A before conversion losses. Check that U10's input current stays below 2.5 A.	Review
4.8.21	U10	3V3, MPCI1_3V3, AVDD33	About 905 µF must charge at start-up: 89 µF on 3V3, 682 µF on MPCI1_3V3, 23 µF on AVDD33 and 110 µF on the LDO and switch inputs. Charging it to 3.3 V within the 1.25 ms typical soft-start (TI TPS62823 datasheet p.5) takes about 2.4 A on top of the load, against the 3.7 A minimum high-side current limit. Check the 3V3 start-up on the first assembled units.	Review
4.8.22	C168, C169	MPCI1_3V3	Endurance is 2000 h at 105 C (Nippon Chemi-Con datasheet p.1). At the 85 C design ambient on an always-on product, life should be estimated from the manufacturer's life formula at the predicted body temperature.	Review
4.8.23	L27, L28 (330 Ω 0603)	MPCI1_3V3	L27 and L28 share the card current; each is rated 1.7 A by its library description, with no datasheet entry. Check that the J8 card peak current stays within the two ferrites and within U10's 3 A together with the rest of 3V3.	Review
4.8.24	U14	USB_1_VBUS	USB_1_VBUS has C107 (4.7 µF) and C108 (100 nF). The 120 µF CL on OUT comes from the ROHM BD2222G Figure 1 application circuit (p.1); the datasheet states no minimum output capacitance.	Review
4.8.25	U14	USB1_EN_3V	U14 EN has VIH = 2.0 V (ROHM BD2222G datasheet p.3), and its driver is U48 B4. Check that the U48 VOH at 3.3 V meets 2.0 V. USB1_EN_3V has no pull resistor, and U14's input is live from 5V before U48 has 3V3. During that window the EN level depends only on U48's unpowered output. A 100 kΩ pull-down to GND would hold the port off.	Review
4.8.26	D32 (D5V0L1B2S9-7)	USB_1_VBUS	D32's VRWM is 5 V, below the 5.5 V maximum on the rail (vSafe5V, USB Type-C specification), so the part operates above a datasheet rating. However, 5.5 V is still below the breakdown voltage, V_BR(min) 6 V (at 1 mA, 25 C), so the part is not in breakdown. There is leakage at 5.5 V, and the datasheet does not characterise it: it guarantees 100 nA maximum leakage only up to 5 V, and leakage rises with temperature. The leakage is a shunt to GND, in the microamp range at worst, so this is a specification-margin note. A part in the 6 V standoff class restores the guarantee, at a modestly higher clamping voltage (Diodes D5V0L1B2S9 datasheet, source: Tomachie).	Review
4.8.27	D32, U14	USB_1_VBUS	D32 clamps at 14 V maximum at 6 A, 8/20 µs (Diodes D5V0L1B2S9 datasheet, source: Tomachie). U14 OUT has a 7.0 V DC absolute maximum and no stated transient rating. Check that U14 OUT is rated for this waveform; L17 sits between D32 and U14 OUT.	Review
4.8.28	R65, R63	VBUS1_SNS	R65 (274 Ω) from USB_1_VBUS and R63 (27 kΩ) to GND put VBUS1_SNS at 0.990 × VBUS, about 5.03 V, not a 1 V sense level. Check that M1 pin 159 USB_1_VBUS is rated for 5 V.	Review
4.8.29	U29, U30	NetR125_1, NetR126_1	VCTRL is fed through R125 and R126 (120 Ω) from 5V, with no capacitor. The AP2132B typical application (p.2) shows 1 µF on VCTRL; that is an application figure, not a minimum. U32's C176 is the on-board precedent. 5.08 V is inside the 4.5-5.5 V VCTRL range, and the 500 µA maximum ICTRL drops 0.06 V across 120 Ω.	Review
4.8.30	U29, U30	2V5, 1V0_ETH	At θJA 53 C/W (Diodes AP2132B datasheet p.4) and 85 C ambient, the 115 C junction limit allows 0.566 W. That is 0.71 A through U29 (0.8 V drop) and 0.25 A through U30 (2.3 V drop). Check that the DP83867E VDDA2P5 current stays below 0.71 A and its VDD1P0 current below 0.25 A.	Review
4.8.31	U29, U26	2V5, 1V8	The TI DP83867E datasheet (p.115) requires the external VDDA1P8 to become stable 0 to 25 ms after VDDA2P5 starts ramping. VDDA2P5 follows U10's 3V3, which M1 enables through CTRL_PWR_EN_MOCI, while VDDA1P8 is on 1V8 from M1 PWR_1V8_MOCI. Check that PWR_1V8_MOCI stabilises within 0 to 25 ms after the 2V5 ramp starts.	Review
4.8.32	C133-C155 (U26 supply decoupling)	1V0_ETH, 2V5	Each VDD1P0 and VDDA2P5 pin has 1 µF and 100 nF, with C133 and C143 as the 10 µF bulk. The 10 nF bulk capacitor that the TI DP83867E datasheet (pp.114-115) lists for each supply is not fitted on 1V0_ETH or 2V5.	Review
4.8.33	U32	MPCI1_1V5	At θJA 53 C/W and 85 C ambient, U32 can deliver 0.31 A at its 1.83 V drop (Diodes AP2132B datasheet p.4). Check that the J8 card's 1.5 V current stays below 0.31 A.	Review
4.8.34	R48/R49, R51/R52, R53/R54, R56/R57	V1, 5V, 3V3, 1V8	The monitor dividers to M1 ADC_1-ADC_4 reproduce the designer's notes: 24 V × 0.02296 = 0.551 V, 5.08 V × 0.30769 = 1.563 V, 3.3 V × 0.5 = 1.65 V, and 1.8 V × 0.69231 = 1.246 V. ADC_1 reaches 1.653 V at 72 V. Check that this is inside the M1 ADC input range.	Review
4.8.35	U41, U42, C191, C192	3V2_AIN1, 3V2_AIN2	The AP2202 ESR vs Output Current graphs (p.19) give a lower stable-ESR boundary of 0.028-0.041 Ω for COUT of 1.0-4.7 µF without a bypass capacitor, and p.20 states that CBYP narrows the stable region. The U41/U42 outputs are all-ceramic: 22 µF X5R plus five 100 nF, with a 100 pF CBYP, which is outside the graphed capacitance. Check that the output ESR at U41/U42 lies inside the stable region. The C191 ESR value was not available at report generation time.	Review
4.8.36	U41, U42	3V2_AIN1, 3V2_AIN2	Each LDO is rated 150 mA. At 200 C/W, with a 1.82 V drop and 85 C ambient, the 115 C junction limit allows 82 mA. The known load is 0.6 mA: U39/U40 at 0.41 mA (AVDD 310 µA typical with external reference, DVDD 100 µA maximum) plus the 0.19 mA divider. The pull-ups add up to 2.04 mA while the lines are held low. This excludes U43/U45 VCC2 and U37/U38 +Vs. Check that the total stays below 82 mA.	Review
4.8.37	U64, C241	NetC241_2	C241 (22 µF 6.3 V, about 3.96 µF at 5.08 V per the Murata DC bias characteristic p.5) meets the 0.1 µF minimum ceramic at IN (p.4). The 10 µF input bulk comes from the USB application circuit and the heavy-load recommendation (p.2, p.11), so it is a recommendation, not a minimum. C241's derating is covered by the 6.3 V capacitor finding.	Review
4.8.38	U35, U64 (AP22653AW6-7)	NetC182_2, +V5_SW	FAULT (U35_4, U64_4) is unconnected, so an overcurrent or latch-off event on the SD-card or display supply cannot be observed or probed. Fit at least a test point; a pull-up to 3V3 makes the latched state readable on the bench.	Review
4.8.39	U64, U68 (AP22653AW6-7)	+V5_SW, TOP_5V	RDS(on) is 135 mΩ maximum over -40 to 85 C, and θJA is 120 C/W (SOT26, JEDEC high-K) (p.4-5). At 85 C ambient the 115 C junction limit allows 0.25 W, or 1.36 A continuous. At U68's 2.10 A maximum limit the dissipation is 0.60 W, which predicts 157 C, above the 145 C thermal shutdown. Check that the J16 two-port load and the J15 5 V load each stay below 1.36 A, or provide copper that lowers θJA.	Review
4.8.40	U65	1V8_SW	At θJA 53 C/W and 85 C ambient, the 1.5 V drop allows 0.38 A before the 115 C junction limit. Known load: at most 2.5 mA (R200, R207, R208, R210 pull-ups and the feedback divider). The display's J15 1.8V/IO_VREF current is not stated. Check that it stays below 0.38 A.	Review
4.8.41	U9, U65, C58, C239	NetC58_2, NetC239_2	The LDO inputs C58 and C239 (22 µF 6.3 V) keep about 6.7 µF at 3.3 V (Murata DC bias characteristic p.5). The 10 µF CIN appears in the AP2132B typical application circuit (p.2), so this is a recommendation, not a minimum. The 6.3 V rating, derated 30%, permits 4.41 V with 3.3 V applied.	Review
4.8.42	U68, R16	TOP_5V, PWR_EN#	Until PWR_EN raises 3V3, R16 has no supply, PWR_EN# sits low, Q11 channel 2 is off, and R223 enables U68. TOP_5V therefore powers the J16 ports from the moment 5V rises, before M1 and U8 are up. It turns off when 3V3 rises, until USB2_EN or U8 enables it again. Check that this power-up pulse on the downstream VBUS is acceptable to attached devices; holding PWR_USB low until 3V3 is present removes it.	Review
4.8.43	Q11, U8 (CYUSB3304)	PWR_EN#	When USB2_EN is high, Q11 channel 1 holds PWR_EN# low, while U8 PWR_EN may be driving it. U8 I/O are specified to 4 mA (Infineon CYUSB3304 datasheet p.36-37). Check that U8 PWR_EN is open-drain, or tolerates being held low, while it drives high.	Review
4.8.44	D31 (D5V0L1B2S9-7)	TOP_5V	D31's VRWM is 5 V, below the 5.25 V maximum on a USB Type-A host VBUS, so it operates above a datasheet rating. However, 5.25 V is still below the breakdown, V_BR(min) 6 V (at 1 mA, 25 C), so the part is not in breakdown. There is leakage at 5.25 V and that leakage is not characterised by the datasheet, which guarantees leakage of 100 nA maximum only up to 5 V; it rises with temperature. The leakage is a shunt to GND in the microamp range at worst. A 6 V standoff class part restores the guarantee, at a modestly higher clamp level (Diodes D5V0L1B2S9 datasheet, source: Tomachie).	Review
4.8.45	L7 (330 Ω 0603, 80 mΩ maximum)	AVDD12	L7 sits outside U9's feedback loop, which regulates DVDD12. At the 1.168 V low setpoint, AVDD12 stays at or above the 1.14 V minimum only while L7 carries no more than 28 mV / 80 mΩ = 0.35 A. Check that the CYUSB3304 AVDD12 current stays below 0.35 A. The AVDD12 share of the 526 mA total was not available at report generation time.	Review
4.8.46	R22 (do-not-install), R23 (0 Ω, fitted)	NetC64_2, 2V5, DVDD12	R23 is fitted and ties VDD_EFUSE to DVDD12 at 1.2 V for normal operation. R22, from 2V5 to NetC64_2, is marked do-not-install only by its value and part number. It is an eFuse programming option (2.5 V lies within the 2.5-2.7 V programming range, p.37). Fitting both would short 2V5 to DVDD12. Express this either/or choice through the design-variant feature, so the BOM and test netlist carry it.	Review
4.8.47	U35	NetR154_1	U35 EN has a VIH of 1.5 V (p.4). It is driven from M1 SD_1_PWR_EN through R155 (274 Ω); the R154 pull-up is not fitted. Check that the M1 SD_1_PWR_EN VOH meets 1.5 V.	Review
4.8.48	U12, U14, U64, U68	5V	The downstream switch limits at their maximum ends total 5.91 A: U14 0.877 A, U68 2.104 A and U64 2.931 A. Adding the 0.88 A known 5V load gives 6.79 A, against U12's 3.5 A rating, before M1, U13 and the UCC12040 load currents. Check that the worst-case simultaneous port, display and module load stays below 3.5 A, which is the designer's 2.5 A extended-version budget plus margin. Otherwise U12's 3.7-5 A peak limit will collapse 5V for M1 and every carrier rail.	Review
4.8.49	U10	3V3	The designer's note on 100_Power gives 'Step-Down 3.3V / 1A'. The known 3V3 load is already 0.89 A (U8 0.81 A, LEDs 75 mA), before the J8 card, U26 through U29/U30, the isolators, the translators and U65. Check that the 3V3 total stays within the budget the note states; U10 itself is rated 3 A.	Review
4.8.50	U6 (MB85RS256TYPNF-G-BCERE1)	1V8C	U6's recommended VDD is 1.8-3.6 V (RAMXEED MB85RS256TY datasheet p.15, Datasheet). 1V8C is the 1.8 V nominal M1 PWR_1V8_MOCI rail, passed through L3 and L4. Check that the M1 1.8 V minimum, less the L3 and L4 drops, stays at or above 1.8 V.	Review
4.8.51	F1	V+, V1	Rated 125 V AC/DC against the 72 V top of the V+ range, and 5 A against the designer's stated 2 A input. The ratings cover the position; no derating percentage applies to a fuse.	✓
4.8.52	D2 (SK510A-LTP)	V1	Anode on V1, cathode on NetC80_1: correct for reverse-polarity blocking. A reversed 72 V input is a fault and is judged against the 100 V VRRM without derating. The 5 A average rating covers the stated 2 A input (MCC SK510A-L datasheet).	✓
4.8.53	U12 (LM5013DDAR)	NetC70_2	Input capacitance is 6 × 2.2 µF = 13.2 µF nominal X7R, matching the designer's note '6 x 2.2uF/100V'. This meets the 4.4 µF X7R/X7S the TI LM5013 datasheet (p.20) asks for. DC-bias loss at 48-72 V is not applied.	✓
4.8.54	U12 (LM5013DDAR)	VIN	Maximum VIN of 72 V is within the 100 V recommended maximum. EN/UVLO (U12_3) is pulled to NetC70_2 by R30 (10 kΩ) with R31 not fitted; tying EN to VIN is permitted, and the EN absolute maximum is 100 V. GND pins 1 and 9 are on GND (TI LM5013 datasheet p.5, p.6, p.11).	✓
4.8.55	U12	5V	R44 (560 kΩ) over R45 + R46 (173.2 kΩ) gives a ratio of 0.23622; with the 1.2 V FB reference that is 5.080 V, matching the designer's note. The 1.181-1.218 V reference band and 1% resistors give 4.92-5.24 V. R44 is inside the 100 kΩ-1 MΩ RFB1 range (TI LM5013 datasheet p.6, p.13).	✓
4.8.56	U12	5V	R33 and R34 in parallel give 43.3 kΩ on RON. FSW = 5.08 × 2500 / 43.3 = 293 kHz (TI LM5013 datasheet p.10). The designer's note '43.3K : 289 kHz' corresponds to a 5.0 V output. On-time at 72 V is 241 ns, above the 50 ns minimum; off-time at 21 V is 2.58 µs.	✓
4.8.57	U12	5V	Type 3 ripple injection (R42 86.6 kΩ, C93 2.2 nF, C90 100 pF): (VIN − VOUT) × tON / (RA × CA) = 69 mV at 21 V, 81 mV at 48 V and 85 mV at 72 V. All exceed the 12 mV minimum and the 20 mV recommended FB ripple (TI LM5013 datasheet p.12, p.17).	✓
4.8.58	C85 (C0603C222K1RACTU)	NetC85_1, NetC85_2	2.2 nF X7R from BST to SW, inside the 1.5-2.5 nF range the TI LM5013 datasheet (p.6) requires. The 100 V rating covers the 50 V the datasheet names (KEMET datasheet).	✓
4.8.59	L14 (DR127-150-R)	5V	Isat 9.66 A is above both the 5 A maximum LM5013 peak current limit and the 7 A TI recommends. Irms 5.03 A, derated 10%, permits 4.53 A against the 3.5 A maximum output. Ripple is 0.88-1.07 A over 21-72 V. 15 µH is adequate up to 72 V (Eaton DR datasheet p.5; TI LM5013 datasheet p.19).	✓
4.8.60	C92, C94, C95, C96, C98, C99 (CL21A226MOQNNNE)	5V	Six 22 µF 16 V X5R on the U12 sheet, 132 µF nominal, matching the designer's note '6 x 22uF/16V'. This exceeds the 22 µF typical application (TI LM5013 datasheet p.19). 16 V derated 30% (capacitor_voltage_pct = 70) permits 11.2 V with 5.08 V applied: correctly sized. DC-bias loss is not applied.	✓
4.8.61	U10, U12, U29, U30, U32	3V3, 5V, 2V5, 1V0_ETH, MPCI1_1V5	PG outputs U10_8, U12_6, U29_1, U30_1 and U32_1 are unconnected and drive no enable or input, so they need no pull-up or test point. The TI TPS62823 datasheet allows PG to be left floating when unused.	✓
4.8.62	L24, C115-C118	5V_CAN	One 22 µF and one 100 nF per UCC12040, meeting the 10 µF required and the 0.1 µF optional at VINP (TI UCC12040 datasheet p.3, p.20). The 5V range of 4.92-5.24 V is inside the 4.5-5.5 V input range.	✓
4.8.63	U10 (TPS62823DLCR)	NetC71_2	VIN is 5.08 V nominal and 5.24 V worst case, inside the 2.4-5.5 V range. C71 and C74 (44 µF nominal) exceed the 4.7 µF input capacitor the TI TPS62823 datasheet asks for. AGND and PGND are on GND.	✓
4.8.64	U10	3V3	VOUT = 0.6 × (54 kΩ + 12 kΩ) / 12 kΩ = 3.300 V, matching the designer's note; the range is 3.21-3.39 V. R2 = 12 kΩ is within the 120 kΩ limit, and C83 (100 pF) is the optional feed-forward capacitor (TI TPS62823 datasheet p.5, p.11).	✓
4.8.65	L11 (SRP3212-1R0M)	3V3	Irms 5.5 A, derated 10%, permits 4.95 A against U10's 3 A maximum output. Isat 6.5 A exceeds the 5.0 A maximum high-side current limit. 1 µH is a supported inductance (Bourns SRP3212 datasheet; TI TPS62823 datasheet p.5, p.12).	✓
4.8.66	C86, C88, C89, C91 (GRM155R60J226ME11D)	3V3	The Murata DC bias characteristic (p.5) shows −69.7% at 3.3 V, about 6.7 µF per part and 26.7 µF for the bank. 6.3 V derated 30% (capacitor_voltage_pct = 70) permits 4.41 V with 3.3 V applied: correctly sized.	✓
4.8.67	C168, C169 (APXF6R3ARA331MF61G)	MPCI1_3V3	330 µF 6.3 V aluminium-polymer. Derated 20% (capacitor_aluminum_voltage_pct = 80) it permits 5.04 V with 3.3 V applied: correctly sized. ESR of 10 mΩ maximum and a 3.9 A ripple rating suit bulk hold-up for card bursts. The 700 µA leakage does not matter on this switched rail (Nippon Chemi-Con datasheet).	✓
4.8.68	L5	AVDD33	AVDD33 carries the CYUSB3304 3.3 V supplies, 286 mA maximum including VDD_IO (Infineon CYUSB3304 datasheet p.37). That is within L5's 1.7 A library rating. AVDD33 has 23.44 µF, and the 3.21-3.39 V range is inside the 3.0-3.6 V AVDD33 range.	✓
4.8.69	U14 (BD2222G-GTR)	USB_1_VBUS	R62 (27 kΩ) is inside the 11.97-106.3 kΩ range and sets Ith to 766 mA typical, 655-877 mA (ROHM BD2222G datasheet p.27). This matches the designer's 0.77 A note. The 655 mA minimum carries a 500 mA default port.	✓
4.8.70	U14	USB1_OC#	R61 (27 kΩ) pulls /OC up to 1V8, within the 10-100 kΩ pull-up range. 1.8 V is far below the 7 V /OC maximum (ROHM BD2222G datasheet p.3, p.17).	✓
4.8.71	U14, C104	NetC104_2	IN is at 5.08 V (4.92-5.24 V), inside the 2.8-5.5 V range. C104 (22 µF) exceeds the 1 µF minimum and the 10 µF bulk recommended in the ROHM BD2222G datasheet (p.17).	✓
4.8.72	U14	USB_1_VBUS	At the 877 mA maximum limit, RON is taken as 146 mΩ: the 120 mΩ 25 C maximum scaled by the 1.22 typical ratio from the On-Resistance vs Ambient Temperature graph (p.7). Dissipation is 0.112 W. At 185 C/W, derived from the 5.4 mW/C derating, the junction reaches about 106 C at 85 C ambient. That is below 115 C and within the 350 mW Pd at 85 C (p.20).	✓
4.8.73	U29 (AP2132BMP-2.5TRG1)	2V5	VOUT = 0.8 × 147 / 47 = 2.502 V, matching the designer's note. The range is 2.42-2.59 V, inside DP83867E VDDA2P5 (2.375-2.625 V). Headroom is 0.8 V, or 0.71 V at the 3V3 low corner, against 450 mV maximum dropout at 2 A. C165 keeps about 9.0 µF at 2.5 V (Murata DC bias characteristic, p.5); with C143 the bank exceeds the 10 µF typical application (Diodes AP2132B datasheet; TI DP83867E datasheet p.9).	✓
4.8.74	U30	1V0_ETH	The range is 0.98-1.03 V across the reference band and 1% resistors, inside DP83867E VDD1P0 (0.95-1.155 V). C166 keeps about 17.6 µF at 1.0 V (Murata DC bias characteristic, p.5), above the 10 µF typical application. VIN of 3.3 V is within 1.4-5.5 V (Diodes AP2132B datasheet; TI DP83867E datasheet p.9).	✓
4.8.75	U32 (AP2132BMP-2.5TRG1), C180	MPCI1_1V5	VOUT = 0.8 × 22 / 12 = 1.467 V, matching the designer's '1.47V' note; the range is 1.424-1.510 V. C180 keeps about 14.1 µF at 1.5 V (Murata DC bias characteristic, p.5), above the 10 µF typical application. 6.3 V derated 30% (capacitor_voltage_pct = 70) permits 4.41 V with 1.5 V applied (Diodes AP2132B datasheet).	✓
4.8.76	U41, U42 (AP2202K-ADJTRG1)	3V2_AIN1, 3V2_AIN2	With the 1.25 V reference between VOUT and ADJ, VOUT = 1.25 × (1 + 10 kΩ / 6.49 kΩ) = 3.176 V (R165/R167 for U41, R164/R166 for U42). This matches the designer's '3.18V' note on 840_ADC and is above the 2.3 V minimum adjustable output. The ±2% accuracy over temperature gives 3.11-3.24 V, inside the ADS1119 AVDD range of 2.3-5.5 V (Diodes AP2202 datasheet, source: Tomachie; TI ADS1119 datasheet p.4, Datasheet).	✓
4.8.77	U41, U42	5V_AIN1, 5V_AIN2	VIN is the U44/U46 VISO output at 5.0 V, with SEL tied to VISO (TI UCC12040 datasheet p.20, Datasheet). This is within the 2.5-13.2 V recommended range and gives 1.82 V headroom against 230 mV maximum dropout at 50 mA. EN is tied to VIN; 5.0 V is below the 15 V EN absolute maximum and above the 2.0 V VIH. GND is on GND_AIN1/GND_AIN2 (Diodes AP2202 datasheet p.4-6, source: Tomachie).	✓
4.8.78	C191, C192, C189, C190	3V2_AIN1, 3V2_AIN2	C190 and C189 (100 pF, ADJ to the isolated ground) are the bypass capacitor. With CBYP fitted, the AP2202 requires at least 2.2 µF output capacitance to prevent oscillation (p.20). C191/C192 (22 µF 16 V X5R) plus five 100 nF exceed this at nominal value; DC-bias loss is not applied. The 16 V rating, derated 30% (capacitor_voltage_pct = 70), permits 11.2 V with 3.2 V applied.	✓
4.8.79	U64	+V5_SW	+V5_SW holds 44.5 µF (C240, C243 and five 100 nF), which includes the 0.1-4.7 µF ceramic bypass recommended on p.11. J15 is a display connector, so the 120 µF USB output requirement (p.2 Note 4) does not apply. IN at 4.92-5.24 V is within 3.0-5.5 V. EN is on PWR_EN and its 1.5 V VIH is covered in the U10 enable row.	✓
4.8.80	U65 (AP2132BMP-2.5TRG1)	1V8_SW	VOUT = 0.8 × (4.7 kΩ + 3.74 kΩ) / 3.74 kΩ = 1.805 V, matching the designer's note; the range is 1.75-1.86 V. VIN is 3.3 V, within 1.4-5.5 V. VCTRL and EN are on +V5_SW at 4.92-5.24 V, within 4.5-5.5 V and below the 6.0 V absolute maximum. C242 is about 12.3 µF at 1.8 V and, with two 100 nF, exceeds the 10 µF typical application (Diodes AP2132B datasheet p.2, p.4-5).	✓
4.8.81	U68 (AP22653AW6-7), R213, R216	TOP_5V	RLIM = 13.6 kΩ gives 1751-2104 mA, 1931 mA typical, by the p.10 equations. This matches the designer's 'Ilim = 1900mA' note and lies within the 10-210 kΩ range (Diodes AP22653A datasheet p.4, p.10).	✓
4.8.82	L1, L40 (330 Ω 0603, 1.7 A)	NetC253_2	In parallel, they carry about 1.05 A each at U68's 2.10 A maximum limit. With the 48-80 mΩ DCR spread, the lower-resistance bead carries at most about 1.31 A, which is within its 1.7 A rating.	✓
4.8.83	C255, C258	TOP_5V	C255 (330 µF polymer, 10 mΩ maximum ESR) covers the 120 µF USB output capacitance the AP22653A datasheet names (p.2 Note 4) for both J16 ports together (2 × 120 µF). C258 provides the 0.1 µF ceramic bypass.	✓
4.8.84	C255 (APXF6R3ARA331MF61G)	TOP_5V	6.3 V aluminium-polymer part with 5 V applied. Derated 20% (capacitor_aluminum_voltage_pct = 80), it permits 5.04 V: correctly sized (Nippon Chemi-Con datasheet).	✓
4.8.85	U68, C253	NetC253_2	C253 (22 µF 16 V) meets the 0.1 µF ceramic minimum and the 10 µF bulk at IN at nominal value. The 16 V rating, derated 30%, permits 11.2 V with 5 V applied. IN at 4.92-5.24 V is within 3.0-5.5 V.	✓
4.8.86	Q11 (NTZD3154NT1G), R223, R16	PWR_USB, PWR_EN#	Channel 1 (gate USB2_EN, drain PWR_EN#) and channel 2 (gate PWR_EN#, drain PWR_USB) form an OR of the module and hub port enables. USB2_EN high, or U8 holding PWR_EN# low, turns channel 2 off and lets R223 enable U68. Vth is 0.45-1.0 V and VGS(max) is 7 V; PWR_EN# reaches at most 3.3 V across gate and source (onsemi NTZD3154N datasheet p.1-2, Datasheet). R223 holds EN at 5.08 V, above the 1.5 V VIH and below the 6 V absolute maximum.	✓
4.8.87	U68, R217, R15	FAULTn, OVRCRRn	FAULT reaches U8 OVRCURR through R217 (0 Ω), with R15 (10 kΩ) to 3V3. Sink current is 0.33 mA against the 10 mA recommended maximum, and 3.3 V is below the 6.0 V pin absolute maximum (Diodes AP22653A datasheet p.4).	✓
4.8.88	U9 (AP2132BMP-2.5TRG1)	DVDD12, AVDD12, NetC64_2	VOUT = 0.8 × (10 kΩ + 20 kΩ) / 20 kΩ = 1.200 V, matching the designer's note. The range of 1.168-1.232 V lies inside the CYUSB3304 1.14-1.26 V DVDD12/AVDD12 range and the 1.2 V VDD_EFUSE normal-operation range (Infineon CYUSB3304 datasheet p.37). VCTRL and EN on 5V are within 4.5-5.5 V. L6 carries at most 0.53 A, against its 1.7 A rating.	✓
4.8.89	C17, C66, C39 (GRM155R60J226ME11D)	DVDD12, AVDD12	Each keeps about 16.2 µF at 1.2 V (Murata DC bias characteristic p.5); C17 and C66 alone exceed the AP2132B 10 µF typical application on DVDD12. The 6.3 V rating, derated 30%, permits 4.41 V with 1.2 V applied.	✓
4.8.90	U35 (AP22653AW6-7), R156	NetC182_2	R156 (47 kΩ) gives 462-587 mA, 522 mA typical, by the p.10 equations. This matches the designer's 'Ilim = 0.5A' note and is within the 10-210 kΩ range. At 587 mA and 135 mΩ the dissipation is 47 mW, a rise of 5.6 C (Diodes AP22653A datasheet).	✓
4.8.91	U35, C181, C182	NetC181_2, NetC182_2	IN is fed from 3V3 through L31, at 3.21-3.39 V. That is within 3.0-5.5 V and above the 2.95 V maximum UVLO. C181 (about 6.7 µF at 3.3 V) meets the 0.1 µF IN minimum, and C182 (100 nF) provides the OUT bypass. The 10 µF and 120 µF output figures apply to USB applications; J12 is a microSD socket (Diodes AP22653A datasheet p.2, p.4).	✓
4.8.92	U53, C230-C233, C237	VCC_232	VCC_232 is U53 VISO with SEL tied to VISO, which selects 5.0 V mode (TI UCC12040 datasheet p.3, p.20); it is not 2.32 V. At 5 V the parts remain correctly sized. C233 and C237 (16 V, derated 30%) permit 11.2 V, and C230-C232 (50 V) permit 35 V.	✓