Supercapacitor backup power supply with current limit and active cell balancing reference design


Design files


This reference design automatically provides a back-up voltage during a power interruption. It manages the charging of supercapitors and provides reverse blocking protection. The maximum supercapacitor charging current and voltage can be adjusted. When the input voltage fails a buck-boost converter (TPS63802) takes over and generates a constant backup voltage. The supercapacitor capacitance and voltage define the energy that is available for the backup. The PMP30693 provides a stable backup output of 3.7 V at 300 mA for more than 100 s until the output voltage drops.

  • Seamless transition between mains power and back-up operation
  • Active cell balancing
  • Adjustable input current limit
  • Complete tested design with available design files and test report
Output voltage options PMP30693.1
Vin (Min) (V) 3.3
Vin (Max) (V) 5.3
Vout (Nom) (V) 3.7
Iout (Max) (A) 1
Output Power (W) 3.7
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck Boost- 4 Switch

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.

TIDT147.PDF (3152 K)

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

TIDM310.PDF (198 K)

Detailed schematic diagram for design layout and components

TIDM311.PDF (28 K)

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

TIDM312.PDF (298 K)

Detailed overview of design layout for component placement

TIDM314.ZIP (560 K)

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

TIDCFO8.ZIP (1024 K)

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

TIDM313.PDF (376 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Ideal diode/ORing controllers

LM661001.5-V to 5.5-V, 1.5-A, 0.5-µA IQ ideal diode with integrated FET

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Shunt voltage references

TLV431A1% accuracy, low-voltage, adjustable precision shunt regulator

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Technical documentation

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Type Title Date
* Test report Supercapacitor Backup Power Supply With Current Limit Reference Design Oct. 25, 2019
Application note Supercapacitor Backup Power Supply w/ Current Limit for Smart Electricity Meter (Rev. A) Aug. 03, 2021

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