This design note introduces a power backup system based on supercapacitors that can protect volatile data in handheld devices in the event of a power loss. Supercapacitors are a compact, robust, and reliable power source that can meet the power requirements of a backup system for short-term power loss events.
This document describes a design for a short-term power holdup system that protects volatile memory in handheld electronic devices when the main battery is removed or fails. The solution utilizes a stack of supercapacitors charged and regulated by the LTC3226, a 2-cell series supercapacitor charger with an integrated PowerPath controller.
| Package Type | 3mm x 3mm 16-lead QFN |
|---|---|
| Backup Power Capacity (Example) | 165mW for about 45 seconds |
| Operating Current (Example) | 150mA |
To protect important data stored in volatile memory when a handheld device's battery pops out or fails.
The LTC3226, which includes a charge pump supercapacitor charger with programmable output voltage.
Nesscap ESHSR-0003C0-002R7 capacitors with a rating of 3F/2.7V.