# Milk-V Duo S Carrier ## Description Dual-rail carrier-board power supply with protected 7V to 16V DC input, 5V 5A primary buck rail, and 3.3V 3A modem buck rail. ## Project Details - **Owner:** semenetsvladyslav - **Created:** 4/14/2026 - **Last Updated:** 4/14/2026 - **Visibility:** Public - **Domain:** Power - **Power Requirements:** Input 7V-16V DC, outputs 5V at 5A and 3.3V at 3A - **Implementation Details:** Protected DC input with screw terminal and SMBJ18A TVS, TPS56528 primary 5V buck, TPS62132 secondary 3.3V modem buck, bulk and HF decoupling on both rails ## Key Components ### D1 — [SMBJ18A-13-F](https://www.flux.ai/lcsc/smbj18a-13-f~uiys.md) - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - Product Info Url: https://lcsc.com/product-detail/TVS_DIODES_SMBJ18A-13-F_SMBJ18A-13-F_C135055.html - Manufacturer Name: DIODES(美台) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-SMBJ18A-13-F_C135055.pdf - Role Details: Unidirectional 18V TVS across input after connector for surge suppression - LCSC Part Number: C135055 - Manufacturer Part Number: SMBJ18A-13-F - Part Type: TVS - JLCPCB Part Class: Extended Part - Role: TVS Protection - Package: SMB_L4.6-W3.6-LS5.3-RD **Pins:** - A [pin 2] - K [pin 1] ### IC1 — [TPS62132RGTT](https://www.flux.ai/vasyl/tps62132rgtt~3yu.md) - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - Role: Secondary Buck Regulator - Package: 16-VFQFN - Manufacturer Part Number: TPS62132RGTT - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftps62132 - Role Details: Generates dedicated 3.3V modem rail from 5V primary rail **Pins:** - AGND [pin 6] - AVIN [pin 10] - DEF [pin 8] - EN [pin 13] - EP [pin 17] - FB [pin 5] - FSW [pin 7] - PG [pin 4] - PGND [pin 16] - PGND [pin 15] - PVIN [pin 11] - PVIN [pin 12] - SS/TR [pin 9] - SW [pin 3] - SW [pin 1] - SW [pin 2] - VOS [pin 14] ### J1 — [M.2 Key B Connector](https://www.flux.ai/collinsemasi/mp2-key-b-connector~gf.md) - Role: Modem Socket - Implementation Details: Unused modem socket pins intentionally left unconnected for this USB/SIM-only implementation; treat remaining unassigned pins as NC during ERC review and layout bring-up. - Manufacturer Name: TE Connectivity - Manufacturer Part Number: 2199230-3 - Role Details: M.2 Key B 3042 socket for 4G/5G modem; using USB 2.0, UIM SIM, 3.3V power, and Full_Card_Power_Off - Application Specification URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Specification+Or+Standard%7F114-115006%7FC%7Fpdf%7FEnglish%7FENG_SS_114-115006_C.pdf%7F2199230-3 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7F1-1773702-1NGFFQRG-EN%7F0214%7Fpdf%7FEnglish%7FENG_DS_1-1773702-1NGFFQRG-EN_0214_1-1773702-1NGFF-QRG-EN-201402.pdf%7F2199230-3 - Package: M.2 Key B 67-position **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 2 [pin 2] - 20 [pin 20] - 21 [pin 21] - 22 [pin 22] - 23 [pin 23] - 24 [pin 24] - 25 [pin 25] - 26 [pin 26] - 27 [pin 27] - 28 [pin 28] - 29 [pin 29] - 3 [pin 3] - 30 [pin 30] - 31 [pin 31] - 32 [pin 32] - 33 [pin 33] - 34 [pin 34] - 35 [pin 35] - 36 [pin 36] - 37 [pin 37] - 38 [pin 38] - 39 [pin 39] - 4 [pin 4] - 40 [pin 40] - 41 [pin 41] - 42 [pin 42] - 43 [pin 43] - 44 [pin 44] - 45 [pin 45] - 46 [pin 46] - 47 [pin 47] - 48 [pin 48] - 49 [pin 49] - 5 [pin 5] - 50 [pin 50] - 51 [pin 51] - 52 [pin 52] - 53 [pin 53] - 54 [pin 54] - 55 [pin 55] - 56 [pin 56] - 57 [pin 57] - 58 [pin 58] - 59 [pin 59] - 6 [pin 6] - 60 [pin 60] - 61 [pin 61] - 62 [pin 62] - 63 [pin 63] - 64 [pin 64] - 65 [pin 65] - 66 [pin 66] - 67 [pin 67] - 68 [pin 68] - 69 [pin 69] - 7 [pin 7] - 70 [pin 70] - 71 [pin 71] - 72 [pin 72] - 73 [pin 73] - 74 [pin 74] - 75 [pin 75] - 8 [pin 8] - 9 [pin 9] - SHIELD [pin S1] - SHIELD__1 [pin S2] ### J10 — [640456-3](https://www.flux.ai/jecstronic/640456-3~tyi.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 0530470310 - Package: Through Hole - Role: Servo Header - Manufacturer Name: Molex - Part Type: Connector - Datasheet URL: https://www.molex.com/pdm_docs/sd/530470310_sd.pdf - Role Details: 3-pin servo header with GND 5V and PWM signal **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] ### J11 — [SFW15R-2STE1LF](https://www.flux.ai/adrian95/sfw15r-2ste1lf~hyf.md) - Datasheet URL: https://cdn.amphenol-cs.com/media/wysiwyg/files/drawing/10172241.pdf - Implementation Details: Mounting pads MP1 and MP2 are mechanical only; any remaining unassigned camera connector pins are intentional NCs for current revision. - Part Type: Connector - Role Details: 15-pin 1.0mm Raspberry Pi style CSI FPC connector for camera interface - Package: Surface Mount - Manufacturer Part Number: SFW15R-2STE1LF - Manufacturer Name: Amphenol - Role: Camera Connector - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: SFW15R2STE1LF **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] - MP1 [pin MP1] - MP2 [pin MP2] ### J12 — [Pin Header 01x04 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x04-254mm-vertical~l97.md) - Manufacturer Part Number: MAVLINK_FC - Package: Through Hole - Role: UART Header - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role Details: 4-pin MAVLINK_FC header pinout: GND, 5V, TX, RX **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] ### J13 — [M50-3651342R](https://www.flux.ai/adrian95/m50-3651342r~3j4.md) - Manufacturer Part Number: M50-3651342R - Role Details: One of two parallel 26-pin headers used to represent the Milk-V Duo S module interface at 22.86 mm spacing - Part Type: Connector - Package: 1x26 1.27 mm SMT Header - Datasheet URL: https://cdn.harwin.com/pdfs/M50-365R.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Harwin Inc. - Role: Module Header Placeholder **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 2 [pin 2] - 20 [pin 20] - 21 [pin 21] - 22 [pin 22] - 23 [pin 23] - 24 [pin 24] - 25 [pin 25] - 26 [pin 26] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### J14 — [M50-3651342R](https://www.flux.ai/adrian95/m50-3651342r~3j4.md) - Part Type: Connector - Role: Module Header Placeholder - Datasheet URL: https://cdn.harwin.com/pdfs/M50-365R.pdf - Manufacturer Part Number: M50-3651342R - Manufacturer Name: Harwin Inc. - Role Details: One of two parallel 26-pin headers used to represent the Milk-V Duo S module interface at 22.86 mm spacing - Package: 1x26 1.27 mm SMT Header - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 17 [pin 17] - 18 [pin 18] - 19 [pin 19] - 2 [pin 2] - 20 [pin 20] - 21 [pin 21] - 22 [pin 22] - 23 [pin 23] - 24 [pin 24] - 25 [pin 25] - 26 [pin 26] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### J2 — [78646-3001](https://www.flux.ai/adrian95/78646-3001~u5c.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package: Micro-SIM SMD - Manufacturer Part Number: 78646-3001 - Implementation Details: Micro-SIM wired as C1=SIM_VCC, C2=SIM_RST, C3=SIM_CLK, C5=GND, C6 left reserved, C7=SIM_IO. Ground shell pins tied to GND. - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Molex%20PDFs/micro-SIM_CardSockets(Hinged,PushPull).pdf - Role: SIM Connector - Manufacturer Name: Molex - Part Type: Connector - Role Details: Micro-SIM socket for modem UIM interface; standard SIM signals C1/C2/C3/C5/C6/C7 routed to M.2 Key B UIM pins **Pins:** - CLK [pin C3] - GND [pin G2] - GND [pin G6] - GND [pin C5] - GND [pin G4] - GND [pin G1] - GND [pin G3] - GND [pin G5] - I/O [pin C7] - RST [pin C2] - VCC [pin C1] - VPP [pin C6] ### J3 — [640456-3](https://www.flux.ai/jecstronic/640456-3~tyi.md) - Role: Servo Header - Part Type: Connector - Datasheet URL: https://www.molex.com/pdm_docs/sd/530470310_sd.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: 3-pin servo header with GND 5V and PWM signal - Package: Through Hole - Manufacturer Part Number: 0530470310 - Manufacturer Name: Molex **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] ### J4 — [640456-3](https://www.flux.ai/jecstronic/640456-3~tyi.md) - Role: Servo Header - Datasheet URL: https://www.molex.com/pdm_docs/sd/530470310_sd.pdf - Role Details: 3-pin servo header with GND 5V and PWM signal - Part Type: Connector - Manufacturer Part Number: 0530470310 - Package: Through Hole - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Molex **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] ### J5 — [640456-3](https://www.flux.ai/jecstronic/640456-3~tyi.md) - Role: Servo Header - Package: Through Hole - Part Type: Connector - Datasheet URL: https://www.molex.com/pdm_docs/sd/530470310_sd.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 0530470310 - Manufacturer Name: Molex - Role Details: 3-pin servo header with GND 5V and PWM signal **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] ### J6 — [640456-3](https://www.flux.ai/jecstronic/640456-3~tyi.md) - Manufacturer Part Number: 0530470310 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Molex - Role Details: 3-pin servo header with GND 5V and PWM signal - Role: Servo Header - Datasheet URL: https://www.molex.com/pdm_docs/sd/530470310_sd.pdf - Package: Through Hole - Part Type: Connector **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] ### J7 — [640456-3](https://www.flux.ai/jecstronic/640456-3~tyi.md) - Manufacturer Part Number: 0530470310 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Molex - Role Details: 3-pin servo header with GND 5V and PWM signal - Datasheet URL: https://www.molex.com/pdm_docs/sd/530470310_sd.pdf - Role: Servo Header - Part Type: Connector - Package: Through Hole **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] ### J8 — [640456-3](https://www.flux.ai/jecstronic/640456-3~tyi.md) - Role: Servo Header - Manufacturer Name: Molex - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 0530470310 - Package: Through Hole - Part Type: Connector - Datasheet URL: https://www.molex.com/pdm_docs/sd/530470310_sd.pdf - Role Details: 3-pin servo header with GND 5V and PWM signal **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] ### J9 — [640456-3](https://www.flux.ai/jecstronic/640456-3~tyi.md) - Manufacturer Name: Molex - Role Details: 3-pin servo header with GND 5V and PWM signal - License: https://creativecommons.org/licenses/by/4.0/ - Role: Servo Header - Manufacturer Part Number: 0530470310 - Part Type: Connector - Datasheet URL: https://www.molex.com/pdm_docs/sd/530470310_sd.pdf - Package: Through Hole **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] ### TP1 — [S1751-46R](https://www.flux.ai/adrian95/s1751-46r~7b.md) - Datasheet URL: https://content.harwin.com/m/c5b84e6a45e9b9f6/original/DRG-02202-Technical-Drawing-Datasheet-S1751R-pdf.pdf - Role Details: Manual USB bridge source pad labeled USB_SRC_DP near P3 - Role: USB Source Pad - Manufacturer Name: Harwin Inc. - Package: SMD - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Test point - Manufacturer Part Number: USB_SRC_DP **Pins:** - P1 ### TP2 — [S1751-46R](https://www.flux.ai/adrian95/s1751-46r~7b.md) - Part Type: Test point - Package: SMD - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: USB_SRC_DM - Manufacturer Name: Harwin Inc. - Role: USB Source Pad - Datasheet URL: https://content.harwin.com/m/c5b84e6a45e9b9f6/original/DRG-02202-Technical-Drawing-Datasheet-S1751R-pdf.pdf - Role Details: Manual USB bridge source pad labeled USB_SRC_DM near P3 **Pins:** - P1 ### U1 — [KF128-5.08-2P-AA](https://www.flux.ai/lcsc/kf128-5p08-2p-aa~0pbi.md) - Role: Power Input - Role Details: 7V to 16V DC input via 2-pin 5.08mm screw terminal - Current Rating: 24A - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2408211511_Cixi-Kefa-Elec-KF128-5-08-2P-AA_C474952.pdf - Manufacturer Part Number: KF128-5.08-2P-AA - Package or Case Code: CONN-TH_P5.08_KF128-5.08-2P - LCSC Part Number: C474952 - Manufacturer Name: KEFA(科发) - Connector Rows: 1 - Product Info Url: https://lcsc.com/product-detail/New-Quadratic-Unclassified-Data_Cixi-Kefa-Elec-KF128-5-08-2P_C474952.html - Connector Type: Screw terminal - Connector Positions: 2 - Connector Pitch: 5.08mm - Operating Temperature: -40℃~+105℃ - Package: CONN-TH_P5.08_KF128-5.08-2P - Connector Gender: Female - JLCPCB Part Class: Extended Part - Part Type: Screw terminal **Pins:** - 1 [pin 1] - 2 [pin 2] ### U2 — [TPS56528DDA](https://www.flux.ai/kicad-part-library/tps56528dda~rj3.md) - Role Details: Generates 5V rail at 5A from protected input supply - Package: SO-8EP - Manufacturer Name: Texas Instruments Inc. - Package or Case Code: Texas_HSOP-8-1EP_3.9x4.9mm_P1.27mm_ThermalVias - Manufacturer Part Number: TPS56528DDA - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps56528.pdf - Role: Primary Buck Regulator **Pins:** - EN [pin 1] - GND [pin 9] - GND [pin 5] - PG [pin 4] - SW [pin 6] - VBST [pin 7] - VFB [pin 2] - VIN [pin 8] - VREG5 [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/semenetsvladyslav/milk-v-duo-s-carrier~5s](https://www.flux.ai/semenetsvladyslav/milk-v-duo-s-carrier~5s).* --- *Generated from [https://www.flux.ai/semenetsvladyslav/milk-v-duo-s-carrier~5s](https://www.flux.ai/semenetsvladyslav/milk-v-duo-s-carrier~5s)*