Backup battery reference design with preboost, charger and 1S Li-ion fuel gauge


Design files


This design shows an automotive backup battery using a 1S Li-ion battery for emergency operation. The primary power input is rated for 6-V to 18-V nominal (2.7-V to 36-V peak) to comply with 12-V automotive requirements. The secondary power input has a fuel gauge to monitor a single cell Li-ion battery and supports input voltages from 2 V to 4.35 V. The onboard learning load allows the implementation of end-of-life detection for the backup battery.

  • Uses a 1S Li-ion battery for emergency operation
  • Seamless transition to backup power
Output voltage options PMP30963.1
Vin (Min) (V) 2.7
Vin (Max) (V) 36
Vout (Nom) (V) 8.5
Iout (Max) (A) 3
Output Power (W) 25.5
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.

TIDT247.PDF (1101 K)

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

TIDMA19.PDF (385 K)

Detailed schematic diagram for design layout and components

TIDMA20.PDF (126 K)

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

TIDMA22.ZIP (3120 K)

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

TIDCG42.ZIP (263 K)

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

TIDMA21.PDF (1452 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

LM5152-Q1Automotive 2.2 MHz wide VIN low IQ synchronous boost controller

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Battery charger ICs

BQ25171-Q1Automotive, 800-mA linear battery charger for 1- to 2-cell Li-ion, LiFePO4, and 1- to 6-cell NiMH

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Battery fuel gauges

BQ34210-Q1Automotive Qualified Single cell system-side CEDV fuel gauge

Data sheet: PDF | HTML

TLV6700Low power window comparator with integrated reference

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report Backup Battery Reference Design With Preboost, Charger, and 1S Li Fuel Gauge PDF | HTML Feb. 04, 2022

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