Back-up battery power reference design for automotive emergency calling applications


Design files


This back-up power reference design is for automotive E-Call application. It uses one cell LiFePO4 as the backup battery. The minimum backup battery voltage can be down to 2 V with boost converter TPS61088-Q1; the maximum output power can be 8 V/1.7A. This reference design is low-cost, high efficiency with a small size. The value this has over the integrated solution competition is much better efficiency and less redundancy when boosting from the back-up battery.

  • Wide input voltage range: 3.8 – 36 V
  • 100mA linear charger
  • 8 V/1.6A output power capability when backup battery voltage drop to 2 V
  • High efficiency
  • Low cost
Output voltage options TIDA-050031.1
Vin (Min) (V) 2
Vin (Max) (V) 3.4
Vout (Nom) (V) 9
Iout (Max) (A) 1.5
Output Power (W) 13.5
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Boost- CCM
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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.

KOKU003A.PDF (1089 K)

Reference design overview and verified performance test data


Reference design overview and verified performance test data

TIDM346.PDF (185 K)

Detailed schematic diagram for design layout and components

TIDM347.PDF (102 K)

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

TIDM348.PDF (120 K)

Detailed overview of design layout for component placement

TIDM350.ZIP (761 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDM349.PDF (517 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost converters (integrated switch)

TPS61088-Q110-A fully-integrated synchronous boost converter, AEC-Q100 qualified

Data sheet: PDF | HTML
Buck converters (integrated switch)

LMR33630-Q13.8-V to 36-V, 3-A synchronous step-down voltage converter

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A25300-mA, 18-V, ultra-low-IQ, high-accuracy, adjustable low-dropout voltage regulator with power good

Data sheet: PDF | HTML
Shunt voltage references

ATL4312.5-V low-IQ adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Backup Battery Power Ref Design for Auto Emergency Calling Apps, eCall and T-Box (Rev. A) PDF | HTML Jul. 09, 2020
Design guide 차량용 긴급 통화 애플리케이션, eCall 및 T-Box를 위한 백업 배터리 전원 레퍼런스 설계 (Rev. A) PDF | HTML Nov. 16, 2022

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