Ultra Low Power Reference Design for Secondary Protection for Over/Under Temperature Conditions


Design files


This reference design implements a secondary thermal monitoring solution for large scale battery packs. Many industry guidelines require the secondary temperature system to remain powered and operational in the event that the primary power supply is lost. This design is capable of continuing operation in a low power state by utilizing low power, factory preset thermal trip points, on a super capacitor powered backup rail. The solution ensure that any over or under temperature event can be captured and dealt with even when the main system controller's power is unavailable, increasing the safe operating window of the total system.

  • Ability to provide thermal monitoring and protection during normal operation or when the primary circuit has lost power
  • Ultra-low power TMP303 uses just 5µA max per device
  • Integrated backup power source via a SuperCap and charger
  • Satisfy primary and secondary protection requirements with interface for TI cell supervisors for charge control
  • Factory programmable over/under temperature trip points with hysteresis
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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.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRVL6.ZIP (1512 K)

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


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

TIDRVL5.PDF (1010 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ25570Ultra Low power Harvester power Management IC with boost charger, and Nanopower Buck Converter

Data sheet: PDF | HTML
Temperature switches

TMP303Factory Programmed Temperature Window Comparator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Ultra-Low-Power Design—Secondary Protection for Over/Undertemp Conditions in ESS Dec. 12, 2017

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