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SC198 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC198 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 16 page  Description March 28, 2007 Typical Application Circuit The SC198 is a high-efficiency, dual synchronous buck converter designed for use in low power applications. Each converter is capable of supplying up to 600mA of average current at one of eight programmable output voltages commonly used as microprocessor supply voltages. The SC198 uses a single control logic block for the two converters, but their controls can be set independently. The SC198 employs a flexible clocking scheme that allows the user to use 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 SC198 provides output voltage flexibility while conserving board space by using control pins to select the output voltage instead of external resistor voltage divider circuits. This eliminates at least four parts from the traditional dual buck converter bill of materials. Dual buck converters with independent control High efficiency - over 90% peak 8 programmable output voltages Input voltage range between 2.7V to 5.5V 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 Features Applications 4.7μH 4.7μH VINA VINR VINB ENA CTLA0 CTLA1 CTLA2 ENB CTLB0 CTLB1 CTLB2 LXA VOUTA GNDA LXB VOUTB GNDB SYNC GNDR VOUTB 1 18 15 5 6 7 16 11 10 9 17 2 4 3 14 12 13 8 20 10μF 10μF VOUTA 10μF SC198 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 www.semtech.com 1 SC198 Dual DC-DC Buck Converter with High Current Capability POWER MANAGEMENT |
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