9-40V Automotive Input, 5V@2.1A Smart USB Charger Reference Design
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This reference design is a complete automotive USB charger solution from the car battery.
From a 9V to 40V DC input,  this design generates a 5V/2.1A output for smart phones and tablets.

  • Complete USB charging solution for automotive applications
  • Very compact size design, PCB layout is optimized and ready to use.
  • The TPS54240 provides very high efficiency (~93%) DC/DC conversion.
  • The TPS2511 USB power switch offers adaptive electrical signature to recognize adn charge many devices.

See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

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Test Data

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Design Files

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(Output Voltage 1)
Vin (Min) (V)9
Vin (Max) (V)40
Vout (Nom) (V)5
Iout (Max) (A)2.1
Output Power (W)10.5
Input TypeDC
TopologyBuck- Non Sync
USB Switch

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TPS2511  USB dedicated charging port controller and 2.2A power switch  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS54240  3.5V to 42V Input, 2.5A Step-Down 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)
TPS2511 Download Download
TPS54240 Download Download
Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 717 14 May 2012
Design files (3)
Title Type Size (KB) Date
ZIP 116 14 May 2012
PDF 27 14 May 2012
PDF 61 14 May 2012

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