This document introduces the LTC3226 single-chip supercapacitor power supply backup solution, including working principles, typical application circuits and other contents.
The LTC3226 simplifies the design of supercapacitor-powered backup applications by integrating a dual-mode charge pump, an LDO, an ideal diode controller, and a power-fail comparator into a single IC. It charges a supercapacitor stack when input power is available and delivers energy from the supercapacitor to the load when nominal input power fails.
The document details the operation of the LTC3226 in a typical 3.3V backup supply application, explaining how it maintains a full charge on the supercapacitor and seamlessly transitions to backup mode when the input voltage drops below a threshold. It also discusses the benefits of using supercapacitors over traditional batteries.
The LTC3226 simplifies the design of a supercapacitor-powered backup solution that charges the supercapacitor when input power is available and delivers energy from it to the load when nominal input power fails.
As long as input power is available, the LTC3226 maintains the supercapacitor stack at a full 5v charge.
If the input voltage falls below 3.15v, the supercapacitor stack becomes the supply.