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Simple Power Backup Supply for a 3.3 V Rail

Introduction

Data loss is a concern in telecom, industrial, and automotive applications where embedded systems require a dependable supply of power. Sudden power interruptions can corrupt data during read and write operations performed by hard drives and flash memory. Designers often use batteries, capacitors, and supercapacitors to store enough energy to support critical loads for a short time during a power interruption.

The LTC3643 power backup supply allows designers to use a relatively inexpensive storage component: low cost electrolytic capacitors. In the backup or holdup supply presented here, the LTC3643 charges a storage capacitor to 40 V when power is present and discharges it to the critical load when power is interrupted. The load (output) voltage can be programmed to any voltage between 3 V and 17 V.

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