# Faint Aqua Carbonite Freezer ## Description Power Tree and Actuator Driver with Robust Filtering, Current Sensing, PGOOD Sequencing, and Star-Tie Grounding ## Project Details - **Owner:** haiderp - **Created:** 1/31/2026 - **Last Updated:** 1/31/2026 - **Visibility:** Public - **Sequencing and Isolation:** Power-up rail order: +35V_IN -> EMI_IN -> V5 -> V3P3 -> V1P8A. Sequencer U6 monitors: V5 (U3:PG), V3P3 (planned PG from downstream load), V1P8A (U4:OUT via sense/flag). Ground domains: PGND (power/switching returns: U3:PGND, Q2 source network, R5/R11 low sides), AGND (quiet analog reference: U3:AGND, D3:C TVS return, U4:GND, sense amplifier/monitor references), DGND (digital/logic returns, reserved for LVDS and control logic if added). Star-tie implementation: AGND, PGND, and any future DGND are shorted only at the single net/interface represented by net GND (components: GND portals and U3 AGND - U4 GND star symbol), forming the sole copper junction on the PCB. LVDS isolation paths (conceptual documentation): LVDS link from upstream controller into this board shall cross isolation at the PGND/AGND star-tie; any LVDS receiver or digital isolator is referenced to DGND, with its return bonded to the star node so that high di/dt currents on PGND (Q2 switching, V35_HV current sense R5, snubbers R6/R9/C10/C11) do not flow in the LVDS or analog ground references. Documented rails and monitoring points: +35V_IN (TP1), V5 (TP2), V3P3 (TP3), V1P8A (TP4), V35_HV/EMI_IN node (TP5) plus per-rail shunt low-side test points TP6–TP9 for current-sense verification. This property summarizes startup rail sequence, ground-domain star-tie, and intended LVDS isolation boundary; schematic portals and GND symbols on Pages 2 and 3 are annotated accordingly. - **System Architecture:** ```mermaid flowchart TD subgraph PowerTree F1["+35V_IN"] D1["TVS D1"] Q1["MOSFET Q1"] EMI["EMI LC Filter"] U2["Buck U2 5V"] V5["V5"] U3["Buck U3 3.3V"] V3["V3P3"] U4["LDO U4 1.8V"] V18["V1P8A"] U6["Sequencer U6"] F1 --> D1 D1 --> Q1 Q1 --> EMI EMI --> U2 U2 --> V5 V5 --> U3 U3 --> V3 V3 --> U4 U4 --> V18 V5 -->|PGOOD| U6 V3 -->|PGOOD| U6 V18 -->|PGOOD| U6 end subgraph ActuatorDriver V35HV["V35_HV"] FilterHV["HVFilter"] Q2["MOSFET_Q2"] ActLoad["Actuator"] U5["GateDriver_U5"] Q3["BlankControl_Q3"] CS["CurrSense"] V35HV --> FilterHV FilterHV --> Q2 Q2 --> ActLoad U5 -->|GateSig| Q2 Q3 --> U5 Q2 -->|Sense| CS end PowerTree --> ActuatorDriver ``` ## Key Components ### D1 — [SM4T35AY](https://www.flux.ai/lcsc/sm4t35ay.md) - LCSC Part Number: C1977082 - Role Details: Transient voltage suppression for 35 V input rail - Part Type: TVS - Manufacturer Part Number: SM4T35AY - Manufacturer Name: ST(意法半导体) - JLCPCB Part Class: Extended Part - Package or Case Code: SMA_L4.3-W2.6-LS5.2-RD - Role: Protection **Pins:** - A [pin 2] - K [pin 1] ### D3 — [SPHV36-01ETG-C](https://www.flux.ai/adrian95/sphv36-01etg-c.md) - Part Type: Diode - Role Details: ESD/TVS protection for printhead connector on V35_HV rail - Role: Protection - Datasheet URL: https://www.verical.com/datasheet/littelfuse-tvs-SPHV36-01ETG-C-895267.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SPHV36-01ETG-C - Manufacturer Name: Littelfuse Inc. **Pins:** - A [pin 2] - C [pin 1] ### F1 — [MF-MSMF010-2](https://www.flux.ai/adrian95/mf-msmf010-2.md) - Package: SMD_1812_4532Metric - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: MF-MSMF010-2 - Role Details: Input fuse for 35V rail overcurrent protection - Role: Protection - Datasheet URL: https://www.bourns.com/docs/product-datasheets/mf-msmf.pdf - Manufacturer Name: Bourns Inc. - Part Type: Fuse **Pins:** - P1 [pin 1] - P2 [pin 2] ### Q1 — [MP6919GS-P](https://www.flux.ai/monolithicpower/mp6919gs-p.md) - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/3496?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing - Manufacturer Name: Monolithic Power Systems - Role Details: MOSFET ideal diode reverse polarity protection for 35V input rail - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP6919 - Manufacturer Part Number: MP6919GS-P - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/m/p/mp6919_tac_1.jpg - Role: Reverse Polarity Protection - Package or Case Code: SOIC-8_MP6919GS-Z_MNP **Pins:** - SENSE [pin 5] - VD [pin 1] - VD [pin 8] - VD [pin 7] - VD [pin 6] - VDD [pin 4] - VS [pin 2] - VS [pin 3] ### Q2 — [FDMC8032L](https://www.flux.ai/jecstronic/fdmc8032l.md) - Part Type: Transistor - Manufacturer Name: onsemi - Manufacturer Part Number: FDMC8032L - Role Details: Dual N-channel MOSFET array for high-voltage actuator switching - Package: POWER33-8_L3.0-W3.0-P0.65-BL-EP - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.onsemi.com/pdf/datasheet/fdmc8032l-d.pdf - Role: Switching **Pins:** - D1 [pin 6] - D2 [pin 5] - G1 [pin 1] - G2 [pin 4] - S1 [pin 2] - S2 [pin 3] ### Q3 — [MMBT3904TT1G](https://www.flux.ai/lcsc/mmbt3904tt1g.md) - JLCPCB Part Class: Extended Part - Role Details: Power sequencing latch for U2 EN control - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2210210100_onsemi-MMBT3904TT1G_C242260.pdf - Part Type: Bipolar Transistors - BJT - LCSC Part Number: C242260 - Role: Latch - Product Info Url: https://lcsc.com/product-detail/Others_ON-Semicon_MMBT3904TT1G_ON-Semicon-ON-MMBT3904TT1G_C242260.html - Manufacturer Part Number: MMBT3904TT1G - Manufacturer Name: onsemi(安森美) - Package or Case Code: SC-75-3_L1.6-W0.8-P1.00-LS1.6-BR - Package: SC-75-3_L1.6-W0.8-P1.00-LS1.6-BR **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### TP1 — [KH-PG2012005-DZ](https://www.flux.ai/lcsc/kh-pg2012005-dz.md) - Manufacturer Name: kinghelm(金航标) - JLCPCB Part Class: Extended Part - Role Details: +35V_IN rail test point - Part Type: Connectors - Accessories - LCSC Part Number: C2842936 - Manufacturer Part Number: KH-PG2012005-DZ - Package or Case Code: TESTPOINT-TH_KH-PG2012005-DZ - Role: Connector **Pins:** - 1 [pin 1] ### TP2 — [KH-PG2012005-DZ](https://www.flux.ai/lcsc/kh-pg2012005-dz.md) - Role: Connector - LCSC Part Number: C2842936 - Role Details: V5 rail test point - Manufacturer Part Number: KH-PG2012005-DZ - Package or Case Code: TESTPOINT-TH_KH-PG2012005-DZ - JLCPCB Part Class: Extended Part - Part Type: Connectors - Accessories - Manufacturer Name: kinghelm(金航标) **Pins:** - 1 [pin 1] ### TP3 — [KH-PG2012005-DZ](https://www.flux.ai/lcsc/kh-pg2012005-dz.md) - Role Details: V3P3 rail test point - Manufacturer Name: kinghelm(金航标) - JLCPCB Part Class: Extended Part - Role: Connector - Part Type: Connectors - Accessories - LCSC Part Number: C2842936 - Manufacturer Part Number: KH-PG2012005-DZ - Package or Case Code: TESTPOINT-TH_KH-PG2012005-DZ **Pins:** - 1 [pin 1] ### TP4 — [KH-PG2012005-DZ](https://www.flux.ai/lcsc/kh-pg2012005-dz.md) - JLCPCB Part Class: Extended Part - Role: Connector - Part Type: Connectors - Accessories - Manufacturer Name: kinghelm(金航标) - LCSC Part Number: C2842936 - Manufacturer Part Number: KH-PG2012005-DZ - Role Details: V1P8A rail test point - Package or Case Code: TESTPOINT-TH_KH-PG2012005-DZ **Pins:** - 1 [pin 1] ### TP5 — [KH-PG2012005-DZ](https://www.flux.ai/lcsc/kh-pg2012005-dz.md) - Package or Case Code: TESTPOINT-TH_KH-PG2012005-DZ - Role: Connector - LCSC Part Number: C2842936 - Manufacturer Part Number: KH-PG2012005-DZ - Role Details: V35_HV rail test point - Manufacturer Name: kinghelm(金航标) - Part Type: Connectors - Accessories - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] ### TP6 — [KH-PG2012005-DZ](https://www.flux.ai/lcsc/kh-pg2012005-dz.md) - Role Details: Sense resistor R2 low-side test point - Package or Case Code: TESTPOINT-TH_KH-PG2012005-DZ - LCSC Part Number: C2842936 - Manufacturer Part Number: KH-PG2012005-DZ - Part Type: Connectors - Accessories - JLCPCB Part Class: Extended Part - Manufacturer Name: kinghelm(金航标) - Role: Connector **Pins:** - 1 [pin 1] ### TP7 — [KH-PG2012005-DZ](https://www.flux.ai/lcsc/kh-pg2012005-dz.md) - JLCPCB Part Class: Extended Part - Part Type: Connectors - Accessories - Manufacturer Name: kinghelm(金航标) - Role Details: Sense resistor R3 low-side test point - Manufacturer Part Number: KH-PG2012005-DZ - LCSC Part Number: C2842936 - Role: Connector - Package or Case Code: TESTPOINT-TH_KH-PG2012005-DZ **Pins:** - 1 [pin 1] ### TP8 — [KH-PG2012005-DZ](https://www.flux.ai/lcsc/kh-pg2012005-dz.md) - Part Type: Connectors - Accessories - JLCPCB Part Class: Extended Part - Manufacturer Name: kinghelm(金航标) - Role: Connector - Role Details: Sense resistor R4 low-side test point - Package or Case Code: TESTPOINT-TH_KH-PG2012005-DZ - LCSC Part Number: C2842936 - Manufacturer Part Number: KH-PG2012005-DZ **Pins:** - 1 [pin 1] ### TP9 — [KH-PG2012005-DZ](https://www.flux.ai/lcsc/kh-pg2012005-dz.md) - Package or Case Code: TESTPOINT-TH_KH-PG2012005-DZ - Role: Connector - Manufacturer Part Number: KH-PG2012005-DZ - LCSC Part Number: C2842936 - Role Details: Sense resistor R5 low-side test point - Part Type: Connectors - Accessories - JLCPCB Part Class: Extended Part - Manufacturer Name: kinghelm(金航标) **Pins:** - 1 [pin 1] ### U2 — [BD9G341EFJ](https://www.flux.ai/kicad-part-library/bd9g341efj.md) - Role Details: 35 V → 5 V primary buck converter, up to 3 A, wide input 12–76 V, integrated FETs, high-efficiency - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Rohm%20PDFs/BD9G341EFJ.pdf - Role: Power Conversion - Package or Case Code: HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.4x3.2mm_ThermalVias - Manufacturer Part Number: BD9G341EFJ **Pins:** - BST [pin 7] - EN [pin 6] - FB [pin 4] - GND [pin 2] - LX [pin 1] - RT [pin 5] - VC [pin 3] - VCC [pin 8] ### U3 — [TPS62823DLC](https://www.flux.ai/kicad-part-library/tps62823dlc.md) - Role: Power Conversion - Manufacturer Name: Texas Instruments Inc. - Package or Case Code: Texas_VSON-HR-8_1.5x2mm_P0.5mm - Datasheet URL: http://www.ti.com/lit/ds/symlink/tps62823.pdf - Role Details: 5 V → 3.3 V step-down regulator, up to 3 A, point-of-load - Manufacturer Part Number: TPS62823DLC **Pins:** - AGND [pin 3] - EN [pin 1] - FB [pin 2] - NC [pin 4] - PG [pin 8] - PGND [pin 5] - SW [pin 6] - VIN [pin 7] ### U4 — [TPS7A4701xRGW](https://www.flux.ai/kicad-part-library/tps7a4701xrgw.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps7a47.pdf - Package or Case Code: Texas_RGW0020A_VQFN-20-1EP_5x5mm_P0.65mm_EP3.15x3.15mm_ThermalVias - Manufacturer Name: Texas Instruments Inc. - Role: Power Conversion - Manufacturer Part Number: TPS7A4701xRGW - Role Details: Low-noise LDO, adjustable to 1.8 V, up to 1 A, for analog 1.8 V rail **Pins:** - 0.1V [pin 12] - 0.2V [pin 11] - 0.4V [pin 10] - 0.8V [pin 9] - 1.6V [pin 8] - 3.2V [pin 6] - 6.4V [pin 4] - 6.4V [pin 5] - EN [pin 13] - EP [pin 21] - GND [pin 7] - IN [pin 15] - IN [pin 16] - NR [pin 14] - OUT [pin 20] - OUT [pin 1] - SENSE/FB [pin 3] ### U5 — [ZXGD3006E6](https://www.flux.ai/kicad-part-library/zxgd3006e6.md) - Package or Case Code: SOT-23-6 - Role: Logic-level Shifting - Datasheet URL: https://www.diodes.com/assets/Datasheets/ZXGD3006E6.pdf - Manufacturer Part Number: ZXGD3006E6 - Role Details: 3.3 V to 35 V gate driver for HV MOSFET array **Pins:** - IN [pin 2] - NC [pin 5] - SINK [pin 4] - SRC [pin 6] - VCC [pin 1] - VEE [pin 3] ### U6 — [LM3880](https://www.flux.ai/vasy_skral/lm3880.md) - Manufacturer Part Number: LM3880MF-1AC/NOPB - Role Details: PGOOD monitoring and sequencing for power rails - Role: Power Management - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - Datasheet URL: http://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=http%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Flm3880 **Pins:** - EN [pin 3] - FLAG1 [pin 6] - FLAG2 [pin 5] - FLAG3 [pin 4] - GND [pin 2] - VCC [pin 1] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/haiderp/faint-aqua-carbonite-freezer](https://www.flux.ai/haiderp/faint-aqua-carbonite-freezer).* --- *Generated from [https://www.flux.ai/haiderp/faint-aqua-carbonite-freezer](https://www.flux.ai/haiderp/faint-aqua-carbonite-freezer)*