Automotive USB Battery Charging Reference Design


Design files


This USB battery charging reference design is optimized for size in order to fit within an automobile power accessory port. The design features a USB dedicated charging port controller with integrated current limiting power switch and a 42V DC/DC converter. High integration and small package sizing allows a small form factor.

  • Typical 13.6V input from car battery. Withstands 45V transients
  • Accurate current limit (+/- 10%)
  • Design provides up to 2.1A output current at 5V output
  • Supports BC 1.2 Dedicated Charging Port specification
  • Small 32mm x 16mm form factor
  • Design has been built and tested.

Output voltage options PMP8851.1
Vin (Min) (V) 8
Vin (Max) (V) 60
Vout (Nom) (V) 5
Iout (Max) (A) 2
Output Power (W) 10
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Synchronous
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

SLVU947A.PDF (988 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

SLVRB74A.PDF (137 K)

Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC128A.ZIP (290 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

TPS5434042 V Input, 3.5 A, Step-Down DC/DC Converter with Eco-mode™

Data sheet: PDF | HTML
USB power switches & charging port controllers

TPS2511USB dedicated charging port controller and 2.2A power switch

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP8851 Test Results (Rev. A) Jun. 15, 2015

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