The S-8424A Series is a CMOS IC designed for use in the switching circuits of primary and backup power supplies on a single chip. It consists of two voltage regulators, three voltage detectors, a power supply switch and its controller, as well as other functions.
In addition to the switching function between the primary and backup power supply, the S-8424A Series can provide the microcontrollers with three types of voltage detection output signals corresponding to the power supply voltage.
Moreover adopting a special sequence for switch control enables the effective use of the backup power supply, making this IC ideal for configuring a backup system.
◾Low power consumption
Normal operation: 15 µA max. (VIN = 6 V)
Backup: 2.1 µA max.
Output voltage tolerance: ±2%
Output voltage: Independently ___selectable in 0.1 V steps in the range of 2.3 V to 5.4 V
◾Three built-in voltage detectors (CS, PREEND, RESET)
Detection voltage precision: ±2%
Selectable in 0.1 V steps in the range of 2.4 V to 5.3 V (CS voltage detector), Selectable in 0.1 V steps in the range of 1.7 V to 3.4 V (PREEND, RESET voltage detector)
◾Switching circuit for primary power supply and backup power supply configurable on one chip
◾Efficient use of backup power supply possible
Backup voltage is not output when the primary power supply voltage does not reach the initial voltage at which the switch unit operates.