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SC198A

Semtech
Part Number SC198A
Manufacturer Semtech
Description Dual DC-DC Buck Converter
Published May 1, 2010
Detailed Description SC198A Dual DC-DC Buck Converter www.DataSheet4U.com with High Current Capability POWER MANAGEMENT Features „ „ „ „ „ „ ...
Datasheet PDF File SC198A PDF File

SC198A
SC198A

Overview
SC198A Dual DC-DC Buck Converter www.
DataSheet4U.
com with High Current Capability POWER MANAGEMENT Features „ „ „ „ „ „ „ „ „ „ „ Description The SC198A is a dual high-efficiency synchronous buck converter designed for use in low power applications.
Each converter is capable of supplying up to 800mA of average current at one of eight programmable output voltages used as microprocessor supply voltages.
The SC198A uses a single control logic block for the two converters, but their controls can be set independently.
The device uses a flexible clocking method allowing the user to set the fixed internal 1MHz oscillator or synchronize the clock to an external source.
The device also has an optional power-save mode that optimizes efficiency for light loads.
The SC198A provides output voltage flexibility while conserving board space by using control pins to select the output voltage.
This eliminates at least four parts from the traditional dual buck converter bill of materials.
Input voltage range — 2.
7V to 5.
5V Dual buck converters with independent control High efficiency — over 90% peak Up to 800mA Load Programmable output voltages per channel — 8 Fixed-frequency operation — 1MHz Optional SYNC clock input Optional power-save under light-load conditions Shutdown current <1μA Soft-start to limit in-rush current 4mm x 4mm MLPQ package Applications „ „ „ „ „ „ „ „ Mobile phones Cordless phones MP3 players Digital cameras PDAs Single Li-Ion cell or (3) NiMH/NiCd cell devices Digital multimedia broadcast (DMB) devices Portable gaming systems Typical Application Circuit VINA VBATT VINR VINB CIN ENA CTLA0 CTLA1 CTLA2 ENB CTLB0 CTLB1 CTLB2 SC198A LXA VOUTA GNDA 4.
7μH VOUTA COUTA 4.
7μH LXB VOUTB GNDB GNDR COUTB VOUTB MODE/SYNC September 26, 2007 1 SC198A www.
DataSheet4U.
com Pin Configuration MODE/SYNC Ordering Information Device SC198AMLTRT(1) (2) ENB Package MLPQ-20 Evaluation Board ENA VINR NC SC198AEVB 20 19 18 17 16 15 VINA LXA GNDA VOUTA CTLA0 1 2...


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