S-8424AAAFT-TB-X Datasheet, PDF (1/46 Pages) Seiko Instruments Inc – BATTERY BACKUP SWITCHING IC

S-8424A Series
www.sii-ic.com
© SII Semiconductor Corporation, 2001-2010
BATTERY BACKUP SWITCHING IC
Rev.3.0_01
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 μA Max. (V_IN = 6 V)
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
• Three built-in voltage detectors (CS, PREEND , RESET )
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)
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
• 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.
• Lead-free, Sn 100%, halogen-free^*1
*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
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