Supercapacitor backup power supply with current limit and active cell balancing reference design
PMP30693
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Key Document
- Supercapacitor Backup Power Supply With Current Limit Reference Design
(PDF 3081 KB)
25 Oct 2019
Description
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.
Features
- 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
See the Important Notice and Disclaimer covering reference designs and other TI resources.