Automotive USB Charger with Linear Droop Compensation Reference Design
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The PMP4425 reference design provides detailed data for evaluating and verifying a USB charger, which uses a USB charge controller, a buck converter and a shunt amplifier. Additionally the design demonstrates an automotive USB charging port that offers short-to-battery protection. With the help of the shunt amplifier, the design is capable of compensating for the effects on Vdroop when a smartphone / tablet is connected to the USB charger using a cable that is roughly 2-3 meters in length. Compliance wtih almost all major smartphone / tablet manufacturers is supported due to programmable current limit up to 2.1 A, BC 1.2 compliant devices are supported as well as D+/D- divider modes of 2.7V/2.7V and 1.2V.

  • Linear cable compensation feature 
  • The TI devices in this design are AEC-Q100 qualified.
  • Supports CDP/SDP auto switch for small industry standard footprint based devices.
  • Size: 95mm(L)X30.7mm(W)x12mm(H)
  • High efficiency with 91% @ 19Vin full load

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA213  26V, bi-directional, high-precision current sense amplifier  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS2546-Q1  Automotive USB Charging Port Controller and Power Switch  Power management  Not Available Not Available
TPS54340-Q1  Automotive 4.5V-42VIN, 3.5A, Step-Down Converter with Eco-mode™  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA213 Download Download
Download Download
TPS2546-Q1 Download
TPS54340-Q1 Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 437 19 Jan 2015
Design files (3)
Title Type Size (KB) Date
ZIP 179 19 Jan 2015
PDF 41 19 Jan 2015
PDF 30 19 Jan 2015

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