Automotive eCall Power Supply Reference Design with High Intermediate Voltage
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

Description & Features

Technical documentation

Support & Training

Order Now

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


This reference design includes a complete power management solution for a standalone emergency call (eCall) system in an automotive environment. The circuit is supplied directly from the car battery rail. It also manages a backup battery to power the eCall system while the car battery rail is not available. It includes power path management which routes the available power rail directly to four DC/DC converters which are supplying the required functional blocks of the eCall system. The solution is optimized to operate at maximum efficiency while powered from the backup battery.

  • Complete power solution for an automotive eCall system
  • Operating input voltage range up to 40V
  • Provides supply voltage for all required eCall functional blocks
  • Up to 87% total efficiency while operating at backup power
  • Up to 84% total efficiency in standby at backup power
  • All DC/DC converters used can operate at switching frequencies above 2MHz

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


Schematic/Block Diagram

Quickly understand overall system functionality.

Download Schematic

Test Data

Get results faster with test and simulation data that's been verified.

Download Test Data

Design Files

Download ready-to-use system files to speed your design process. Get Viewer.

Download Design Files

(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
Vin (Min) (V)5555
Vin (Max) (V)40404040
Vout (Nom) (V)3.81.859
Iout (Max) (A)2111
Output Power (W)7.61.859
TopologyBuck- Integrated SwitchBuck- Integrated SwitchBuck- Integrated SwitchSepic- Integrated Switch

TI Devices (7)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD25402Q3A  -20-V, P channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 8.9 mOhm  MOSFETs  Sample & Buy Not Available
TAS5421-Q1  Automotive, 22-W, 1-ch, 4.5- to 18-V analog input class-D audio amplifier w/ I2C diag, load dump  Audio amplifiers  Not Available View Design Kits & Evaluation Modules
TL331-Q1  Automotive Catalog Single Differential Comparator  Amplifiers  Sample & Buy Not Available
TLVH431A-Q1  Automotive, low-voltage adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
TPS61175-Q1  3-A, 40-V high voltage boost converter with soft-start and programmable switching frequency  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS62130A-Q1  TPS62130A-Q1 3 to 17-V 3-A Automotive Step-Down Converter in 3 × 3 QFN Package  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS62160-Q1  3V-17V 1A Automotive Step-Down Converters in 2x2SON  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD25402Q3A VSONP (DNH)| 8 Download
TAS5421-Q1 Download
TL331-Q1 Download Download
TLVH431A-Q1 Download Download
TPS61175-Q1 Download
TPS62130A-Q1 Download Download
TPS62160-Q1 Download Download

Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.

Step 1: Download and install the free download.

Step 2: Download the Symbol and Footprint from the CAD.bxl file table.

Technical documentation

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

User guide (1)
Title Type Size (KB) Date
PDF 273 22 Feb 2016
Design files (4)
Title Type Size (KB) Date
ZIP 162 22 Feb 2016
PDF 698 22 Feb 2016
PDF 94 22 Feb 2016
PDF 795 22 Feb 2016

Support & training

TI E2E™ forums with technical support from TI engineers

Search our extensive online knowledge base where millions of technical questions and answers are available 24/7.

Search answers from TI experts

Content is provided 'AS IS' by the respective TI and Community contributors and does not constitute TI specifications.
See terms of use.

If you have questions about quality, packaging, or ordering TI products visit our Support page.

Technical articles