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SC198AEVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC198AEVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 15 page  POWER MANAGEMENT 1 SC198A Dual DC-DC Buck Converter with High Current Capability Features 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 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 synchro- nize 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 con- serving 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. Typical Application Circuit September 26, 2007 4.7μH 4.7μH VINA VINR VINB ENA CTLA0 CTLA1 CTLA2 ENB CTLB0 CTLB1 CTLB2 LXA VOUTA GNDA LXB VOUTB GNDB MODE/SYNC GNDR CIN COUTA COUTB SC198A VOUTA VOUTB VBATT |
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