Automotive USB Charging Port Supply Reference Design With Programmable Cable Compensation PMP9795 (ACTIVE)

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Key Document

Description

This reference design includes a power management circuit  capable of controlling a remote USB charging port in an automotive application environment. The circuit can be supplied directly from the car battery rail. It uses a small and highly efficient step-down converter, the TPS62130A-Q1, to regulate the required USB bus voltage for charging with charge currents up to 2.5A.

The USB charging port is controlled and protected by using a USB charging controller, the TPS2549-Q1, which is also used to monitor the charge current for adjusting the output voltage of the TPS62130A-Q1. This enables the voltage drop across the cable connection to the USB port to be compensated. In addition, the TPS2549-Q1 generates all required signals to indicate a USB charging port to the equipment connected to the port.

The required compensation for  the voltage drop across the cable connection to USB varies with the cable length.  This reference design presets the cable compensation for different cable lengths. It uses a rail-to-rail operational amplifier, OPA348,  to adjust the current sinked  from the TPS2549-Q1 into the TPS62130-Q1 and set the output voltage of the TPS62130A-Q1 accordingly.

Features
  • Complete power solution for a remote USB charging port
  • Input overvoltage protection for surge voltages up to 40V
  • Supports charge currents up to 2.5A
  • Up to 92% efficiency at full output power
  • Digitally programmable cable voltage drop compensation for 2% accurate load regulation

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Design Files

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Parametrics
 PMP9795.1
(Output Voltage 1)
Vin (Min) (V)5
Vin (Max) (V)40
Vout (Nom) (V)5
Iout (Max) (A)2.5
Output Power (W)12.5
Isolated/Non-IsolatedNon-Isolated
Input TypeDC
TopologyBuck- Synchronous

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA348  1MHz, 45uA, RRIO, Single Op Amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS2549-Q1  USB Charging Port Controller  Circuit protection  Sample & Buy View Design Kits & Evaluation Modules
TPS62130  3-17V 3A Step-Down Converter with DCS-Control in 3x3 QFN Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA348 Download Download
Download Download
Download Download
TPS2549-Q1 Download Download
TPS62130 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 381 20 Oct 2016
Design files (6)
Title Type Size (KB) Date
ZIP 457 21 Oct 2016
ZIP 533 21 Oct 2016
PDF 118 21 Oct 2016
PDF 229 21 Oct 2016
PDF 45 21 Oct 2016
PDF 370 21 Oct 2016
Related Tools & Software

Reference Designs  ( 1 )

Name Part Number Tool Type
Automotive USB Charger  PMP6934  Reference Designs 

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