9-40V Automotive Input, 5V@2.1A Smart USB Charger Reference Design


Design files


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.
Output voltage options PMP7388.1
Vin (Min) (V) 9
Vin (Max) (V) 40
Vout (Nom) (V) 5
Iout (Max) (A) 2.1
Output Power (W) 10.5
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Non Sync^USB Switch
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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.

SLVU736.PDF (774 K)

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


Detailed schematic diagram for design layout and components


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

SLVC428.ZIP (116 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)

TPS542403.5V to 42V Input, 2.5A Step-Down 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
Technical article Power Tips: how to build a car charger Sep. 03, 2013
Technical article Silicon based annoyance reduction made easy Aug. 14, 2012
Test report PMP7388 Test Results May 14, 2012

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