Supercapacitor Backup Power Supply with Active Cell Balancing Reference Design
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Key Document


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

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
Vin (Min) (V)3
Vin (Max) (V)5
Vout (Nom) (V)3.3
Iout (Max) (A).5
Output Power (W)1.65
Input TypeDC
TopologyBuck Boost- Integrated Switch

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LP2998  1.5-A DDR termination regulator with shutdown pin  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS63020  High Efficiency Single Inductor Buck-Boost Converter with 4A Switch  Buck-boost & inverting regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LP2998 Download Download
Download Download
TPS63020 Download Download

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Technical documentation

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Application note (1)
Title Type Size (KB) Date
PDF 218 11 Dec 2014
User guide (1)
Title Type Size (KB) Date
PDF 429 22 Sep 2015
Design files (5)
Title Type Size (KB) Date
ZIP 330 29 Sep 2015
PDF 382 29 Sep 2015
PDF 308 29 Sep 2015
PDF 101 29 Sep 2015
PDF 429 29 Sep 2015
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Reference Designs (2)

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