# Power Management Board ## Description Production-grade power management board with protected 9-18V barrel input, auxiliary USB-C 5V sink input, TPS5430 5V buck rail, BQ24074 single-cell Li-ion power-path charging, and MIC5504 3.3V battery-backed output. ## Project Details - **Owner:** emasicollins - **Created:** 4/27/2026 - **Last Updated:** 4/27/2026 - **Visibility:** Public - **Battery:** 1S Li-ion/LiPo with NTC support - **Operating Voltage:** 9-18V DC primary input; 5V USB-C auxiliary sink input - **Implementation Details:** Default charger mode is USB500; charge current set by R7=1.8k to about 494mA; termination target about 50mA with R12=3k; charger current is intentionally conservative because USB and barrel share the same charger-input OR-ing node - **Power Requirements:** 5V main rail up to 2A from buck; 3.3V battery-backed rail from charger OUT ## Key Components ### D1 — [SMBJ24A-TR](https://www.flux.ai/lcsc/smbj24a-tr~hqz2.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_STMicroelectronics-SMBJ24A-TR_C133668.pdf - JLCPCB Part Class: Extended Part - Role Details: 24V standoff TVS on barrel input - Package: SMB - Role: TVS Protection - Product Info Url: https://lcsc.com/product-detail/TVS_STMicroelectronics_SMBJ24A-TR_SMBJ24A-TR_C133668.html - Manufacturer Part Number: SMBJ24A-TR - Manufacturer Name: ST(意法半导体) - Part Type: TVS - LCSC Part Number: C133668 - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD **Pins:** - A [pin 2] - K [pin 1] ### D2 — [SMBJ5.0A-13-F](https://www.flux.ai/lcsc/smbj5p0a-13-f~q28r.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-SMBJ5-0A-13-F_C110528.pdf - Part Type: TVS - Manufacturer Name: DIODES(美台) - Role Details: 5V TVS on USB-C VBUS - Package: SMB - Product Info Url: https://lcsc.com/product-detail/TVS_DIODES_SMBJ5-0A-13-F_SMBJ5-0A-13-F_C110528.html - LCSC Part Number: C110528 - Role: TVS Protection - Manufacturer Part Number: SMBJ5.0A-13-F - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - JLCPCB Part Class: Extended Part **Pins:** - A [pin 2] - C [pin 1] ### D3 — [MBRA340T3G](https://www.flux.ai/vasy_skral/mbra340t3g~p1.md) - Manufacturer Part Number: MBRA340T3G - Manufacturer Name: onsemi - Part Type: Diode - Package: SMA - Role: Schottky Diode - Role Details: Buck catch diode from PH node to ground - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mbra340t3-d.pdf **Pins:** - A [pin 2] - K [pin 1] ### D4 — [BZT52C12-13-F](https://www.flux.ai/adrian95/bzt52c12-13-f~6nn.md) - Role Details: 12V zener protecting PMOS gate-source voltage - Manufacturer Part Number: BZT52C12-13-F - Role: Gate Clamp - Manufacturer Name: Diodes Incorporated - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds18004.pdf - Package: SOD-123 - Part Type: Diode **Pins:** - A [pin 2] - K [pin 1] ### F1 — [A250-200](https://www.flux.ai/lcsc/a250-200~o4xq.md) - Role Details: Primary DC input resettable fuse - Manufacturer Part Number: A250-200 - Package: PTC THT - Package or Case Code: FUSE-TH_L9.0-W4.7-P5.10-D0.8 - Manufacturer Name: JDTfuse(集电通) - JLCPCB Part Class: Extended Part - Part Type: Resettable Fuses - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010303_Shenzhen-JDT-Fuse-A250-200_C135441.pdf - Role: Fuse - LCSC Part Number: C135441 - Product Info Url: https://lcsc.com/product-detail/PTC-Fuse_2A-Self-recovery_C135441.html **Pins:** - 1 [pin 1] - 2 [pin 2] ### F2 — [1812L200/12DR](https://www.flux.ai/jecstronic/1812l20012dr~98l.md) - Current Rating: 2A - Datasheet URL: https://www.littelfuse.com/~/media/electronics/datasheets/resettable_ptcs/littelfuse_ptc_1812l_datasheet.pdf.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Fuse - Part Type: Fuse - Package: 1812 - Manufacturer Name: Littelfuse Inc. - Role Details: USB 5V resettable fuse - Manufacturer Part Number: 1812L150/12DR **Pins:** - P1 [pin 1] - P2 [pin 2] ### J1 — [Vertical Barrel Jack](https://www.flux.ai/corynrobinson/vertical-barrel-jack~vk.md) - Part Type: Connector - Role: Power Input - Datasheet URL: https://www.cuidevices.com/product/resource/pj-044a.pdf - Manufacturer Part Number: PJ-044A - Package: Barrel Jack THT - Manufacturer Name: Texas Instruments Inc. - Purchase Url: https://www.digikey.com/en/products/detail/cui-devices/PJ-044A/1644567 - Role Details: Primary 9V to 18V DC barrel input **Pins:** - GND - GND - VCC ### J2 — [54-00285](https://www.flux.ai/adrian95/54-00285~482.md) - Role: Power Input - Manufacturer Part Number: 54-00285 - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: USB-C 5V auxiliary input - Part Type: Connector - Manufacturer Name: Tensility International Corp - Datasheet URL: https://tensility.s3.us-west-2.amazonaws.com/uploads/pdffiles/54-00285.pdf - Package: USB-C Power-Only SMT **Pins:** - CC1 [pin A5] - CC2 [pin B5] - GND_A [pin A12] - GND_B [pin B12] - VBUS_A [pin A9] - VBUS_B [pin B9] ### J3 — [S3B-PH-K-S(LF)(SN)](https://www.flux.ai/adrian95/s3b-ph-k-slfsn~y4m.md) - Package: JST-PH Right Angle THT - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: S3B-PH-K-S(LF)(SN) - Part Type: Connector - Role Details: Single-cell Li-ion battery connector with NTC sense - Manufacturer Name: JST Sales America Inc. - Role: Battery Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J4 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Symbol Style: parametric-v1 - Role Details: 5V output rail terminal - Manufacturer Part Number: 282837-2 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Manufacturer Name: TE Connectivity AMP Connectors - Package: Terminal Block 5.08mm THT - Part Type: Connector - Role: Power Output **Pins:** - 1 [pin 1] - 2 [pin 2] ### J5 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Role: Power Output - Manufacturer Part Number: 282837-2 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Manufacturer Name: TE Connectivity AMP Connectors - Symbol Style: parametric-v1 - Part Type: Connector - Package: Terminal Block 5.08mm THT - Role Details: 3.3V battery-backed output rail terminal **Pins:** - 1 [pin 1] - 2 [pin 2] ### Q1 — [DMP3098L-7](https://www.flux.ai/jecstronic/dmp3098l-7~qk6.md) - Role: Reverse Protection - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds31447.pdf - Package: SOT-23-3 - Manufacturer Part Number: DMP3098L-7 - Manufacturer Name: Diodes Incorporated - Role Details: High-side PMOS reverse polarity blocker for DC input - Part Type: Transistor **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### Q2 — [DMP3098L-7](https://www.flux.ai/jecstronic/dmp3098l-7~qk6.md) - Role Details: High-side PMOS isolating USB 5V from the main 5V rail - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds31447.pdf - Manufacturer Part Number: DMP3098L-7 - Role: Power OR-ing - Manufacturer Name: Diodes Incorporated - Part Type: Transistor - Package: SOT-23-3 **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### Q3 — [DMP3098L-7](https://www.flux.ai/jecstronic/dmp3098l-7~qk6.md) - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds31447.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Power OR-ing - Manufacturer Part Number: DMP3098L-7 - Part Type: Transistor - Package: SOT-23-3 - Manufacturer Name: Diodes Incorporated - Role Details: High-side PMOS isolating buck 5V from the charger input OR-ing rail **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### RT1 — [NCP18XH103J03RB](https://www.flux.ai/adrian95/ncp18xh103j03rb~buk.md) - Datasheet URL: https://www.mouser.com/datasheet/2/281/r44e-522712.pdf - Part Type: Sensor - Role Details: 10k NTC for BQ24074 TS input - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Murata Electronics - Role: Battery Temperature Sense - Package: 0603 - Manufacturer Part Number: NCP18XH103J03RB **Pins:** - P1 [pin 1] - P2 [pin 2] ### U1 — [TPS5430DDA](https://www.flux.ai/kicad-part-library/tps5430dda~3i5.md) - Manufacturer Name: Texas Instruments Inc. - Datasheet URL: http://www.ti.com/lit/ds/symlink/tps5430.pdf - Package or Case Code: TI_SO-PowerPAD-8_ThermalVias - Package: PowerSO-8 - Role: Buck Regulator - Manufacturer Part Number: TPS5430DDA - Role Details: 9V to 18V input down to 5V main rail **Pins:** - BOOT [pin 1] - EN [pin 5] - GND [pin 6] - GNDPAD [pin 9] - NC [pin 3] - NC [pin 2] - PH [pin 8] - VIN [pin 7] - VSENSE [pin 4] ### U2 — [BQ24074RGTT](https://www.flux.ai/vasyl/bq24074rgtt~qs.md) - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - Role Details: 5V input Li-ion charger with system OUT rail - Role: Battery Charger - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fbq24074 - Manufacturer Part Number: BQ24074RGTT - Package: VQFN-16 **Pins:** - ~CE [pin 4] - ~CHG [pin 9] - ~PGOOD [pin 7] - BAT [pin 3] - BAT [pin 2] - EN1 [pin 6] - EN2 [pin 5] - ILIM [pin 12] - IN [pin 13] - ISET [pin 16] - ITERM [pin 15] - OUT [pin 10] - OUT [pin 11] - TMR [pin 14] - TS [pin 1] - VSS [pin 17] - VSS [pin 8] ### U3 — [MIC5504-3.3YM5](https://www.flux.ai/kicad-part-library/mic5504-3p3ym5~ud0.md) - Role: LDO Regulator - Datasheet URL: http://ww1.microchip.com/downloads/en/DeviceDoc/MIC550X.pdf - Manufacturer Name: Microchip Technology Inc. - Role Details: 3.3V battery-backed logic rail from charger OUT - Manufacturer Part Number: MIC5504-3.3YM5 - Package or Case Code: SOT-23-5 - Package: SOT-23-5 **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/emasicollins/power-management-board~40](https://www.flux.ai/emasicollins/power-management-board~40).* --- *Generated from [https://www.flux.ai/emasicollins/power-management-board~40](https://www.flux.ai/emasicollins/power-management-board~40)*