Dual USB Type-C™ 1.5A DFPs Car Charger Reference Design
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Key Document


PMP40270 is a dual USB type-C DFPs reference design, as a cigar lighter adapter. It has a high effieicny DCDC converter LMS3635  inside, combined with a low cost USB type-C source controller TPS25821 for each port. Full voltage range of a 12V car battery, as well as the transistion voltage up to 42V, is supported for this design. Two output type-C ports can deliever 5V1.5A indepentenly. The legacy DCP charging protocol is also involved for both ports. With the high integration parts, a low cost solution can be achieved.

  • Full integration solution for USB Type-C DFP port
  • IEC ESD protection on CC1/CC2
  • USB BC1.2 DCP charging protocols supported
  • High efficiency up to 95% with full load
  • Compact form factor for CLAs

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Schematic/Block Diagram

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)66
Vin (Max) (V)4242
Vout (Nom) (V)55
Iout (Max) (A)1.51.5
Output Power (W)7.57.5
Input TypeDCDC
TopologyBuck- SynchronousBuck- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMS3635-Q1  3.5A /5.5A, 36V Synchronous, 400kHz, Step-Down Converter  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS25821  USB Type-C™ source controller and 1.5A power switch  USB ICs  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMS3635-Q1 Download Download
TPS25821 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1161 11 Dec 2017
Design files (6)
Title Type Size (KB) Date
ZIP 515 11 Dec 2017
ZIP 1933 11 Dec 2017
PDF 1163 11 Dec 2017
PDF 276 11 Dec 2017
PDF 61 11 Dec 2017
PDF 189 11 Dec 2017
Related Tools & Software

Reference Designs (2)

Name Part Number Tool Type
USB Type-C™ DFP 5V 1.5A + USB Type-A 5V 2.4A Car Charger Reference Design  PMP40269  Reference design 
USB Type-C™ DFP 5V3A Charger Reference Design  PMP11594  Reference design 

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