Supercapacitor Backup Power Supply with Active Cell Balancing Reference Design


Design files


This reference design describes a backup power circuit which addresses instantaneous protection against power interruptions by using a buck-boost converter and two stacked supercapacitors. The implementation is based on a completely integrated TPS63020 buck-boost converter circuit enabling a small total solution size. The design also provides an active cell balancing circuit. This configuration has been tested with a full test report and operation explanation.

  • No glitches at the automatic transition from main power to backup power operation
  • Active cell balancing
  • Backup-capacitor type and size are selectable to meet backup power needs
  • Up to 15 Watt output power
  • Small and high efficiency single converter solution
  • Support of pulsed loads connected to a weak supply
Output voltage options PMP9766.1
Vin (Min) (V) 3
Vin (Max) (V) 5
Vout (Nom) (V) 3.3
Iout (Max) (A) .5
Output Power (W) 1.65
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck Boost- Integrated Switch
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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.

SLVA726.PDF (495 K)

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


Detailed schematic diagram for design layout and components


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

TIDCB37.ZIP (330 K)

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


PCB layer plot file used for generating PCB design layout


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck-boost, inverting & split-rail converters (integrated switch)

TPS63020High Efficiency Single Inductor Buck-Boost Converter with 4A Switch

Data sheet: PDF | HTML
Multi-channel ICs (PMICs)

LP29981.5-A DDR termination regulator with shutdown pin

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP9766 Test Results Sep. 22, 2015
Application note High-Efficiency Backup Power Supply Dec. 11, 2014

Related design resources

Reference designs

PMP9755 Backup Power Solution Using Supercap with TPS61030 for Data Concentrator Circuit Reference Design PMP9761 High-Efficiency Backup Power Supply Reference Design

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