S-8424A Series

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BATTERY BACKUP SWITCHING IC

© SII Semiconductor Corporation, 2001-2010

1

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 micro controllers 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.



Features

• Low power consumption

Normal operation: 15

Backup:

2.1

μA Max.

• Voltage regulator

Output voltage tolerance :

±2 %

Output voltage:

Independently selectable in 0.1 V steps in the range of 2.3 V to 5.4 V

Detection voltage precision:

±2 %

Detection voltage:

Selectable in 0.1 V steps in the range of 2.4 V to 5.3 V (CS voltage detector)

voltage detector)

• Switching circuit for primary power supply and backup power supply configurable on one chip

• Efficient use of backup power supply possible

• Special sequence

Backup voltage is not output when the primary power supply voltage does not reach the initial voltage at which

the switch unit operates.

*1. Refer to “ Product Name Structure” for details.



Packages

• 8-Pin TSSOP

• 8-Pin SON(B)



Applications

• Video camera recorders

• Still video cameras

• Memory cards

• SRAM backup equipment