5V@2.1A USB Charger Automotive Reference Design
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Key Document


This USB 3.0 charger provides 5V @ 2.1A over an automotive input range of 8V - 40V. It uses the integrated FET TPS54340 PWM Buck controller and implements cable voltage droop compensation. A TPS2546 charging port controller provides data line switching plus an integrated FET with dual current protection thresholds.

  • 8 to 40V (12V nominal) input voltage and 5V/2.1A output with TPS54340
  • Programmable voltage droop
  • Supports both USB 2.0 and 3.0 power switch requirements
  • This reference design has been lab tested and is supported with design files and an application note

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Design Files

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(Output Voltage 1)
Vin (Min) (V)8
Vin (Max) (V)40
Vout (Nom) (V)5
Iout (Max) (A)2.1
Output Power (W)10.5
Input TypeDC
TopologyBuck- Non Sync

TI Devices (4)

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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
TPD2E001  Low-capacitance 2-channel +/-15k-V ESD protection array for high-speed data interfaces  Circuit protection ICs  Sample & Buy View Design Kits & Evaluation Modules
TPS2546  USB charging port controller with CDP/SDP auto swtich and 2.5A power switch with load detection  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS54340  42 V Input, 3.5 A, Step-Down DC/DC Converter with Eco-mode™  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA213 Download Download
Download Download
TPD2E001 Download -
Download Download
Download -
Download Download
TPS2546 Download Download
TPS54340 Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1576 30 Nov 2015
Design files (5)
Title Type Size (KB) Date
ZIP 249 30 Nov 2015
ZIP 13917 30 Nov 2015
PDF 80 30 Nov 2015
PDF 99 30 Nov 2015
PDF 131 30 Nov 2015
Related Tools & Software

Reference Designs (1)

Name Part Number Tool Type
Dual-Port Automotive USB Charger Reference Design  PMP7390  Reference design 

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