The ICL7673 is a low-cost automatic battery backup switch that can automatically connect the output to the higher voltage of the two power supplies
The ICL7673 is a monolithic CMOS battery‑backup circuit designed to switch between a main power source and a battery backup with low insertion loss, low leakage, and low quiescent current. It provides logic outputs to indicate the active supply and can drive external PNP transistors for higher current capability.
Typical applications include real‑time clocks, volatile RAM, portable instruments, and any system that must retain power when the primary AC line fails. The datasheet includes pinouts, absolute maximum ratings, electrical specifications, and example circuit diagrams for discrete, low‑current, and high‑current backup configurations.
| Supply Voltage Range | 2.5 V – 15 V |
|---|
It operates with input voltages from 2.5 V to 15 V.
It automatically connects the output to the higher of two supply voltages and switches back when the main supply is restored.