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SC286 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC286 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 20 page  POWER MANAGEMENT Dual Channel 4A Synchronous Step-Down Regulator SC286 Features Input Voltage Range — 2.9 to 5.5V Output Voltage Range — 0.8V to 3.3V Output Current — up to 4A for each channel Ultra-Small Footprint — <1mm Height Solution Switching Frequency — 1.6MHz Automatic Power Save Mode Efficiency Up to 95% Low Output Noise Across Load Range Excellent Transient Response Start Up into Pre-Bias Output Duty-Cycle Low Dropout Operation — 100% Shutdown Current — <1µA Externally Programmable Soft Start Time Power Good indicator Input Under-Voltage Lockout Output Over-Voltage, Current Limit Protection Over-Temperature Protection Thermally Enhanced 4 x 4 x 0.6 (mm) MLPQ-UT28 package Lead-free, Halogen free, and RoHS/WEEE compliant Applications Routers and Network Cards LCD TV Office Automation Printers Description The SC286 is a dual channel 4A synchronous step-down regulator designed to operate with an input voltage range of 2.9V to 5.5V. Each channel offers fifteen pre- determined output voltages via separate control pins programmable from 0.8 to 3.3 Volts. The control pins allow for on-the-fly voltage changes, enabling system designers to implement dynamic power savings. The device is also capable of adjusting output voltage via an external resistor divider. The SC286 is optimized for maximum efficiency over a wide range of load currents. During full load operation, the device operates in PWM mode with fixed 1.6MHz oscillator frequency, allowing the use of small surface mount external components. As the load decreases, the regulator will transition into Power Save mode maintain- ing high efficiency. Connecting the control pins to logic low forces the device into shutdown mode reducing the supply current to less than 1μA. Connecting any of the control pins to logic high enables the converter and sets the output voltage accord- ing to Table 1. Other features include under-voltage lockout, programmable soft-start to limit in-rush current, power good indicator, over-temperature protection, and output short circuit protection. The SC286 is available in a thermally-enhanced, 4 x 4 x 0.6 (mm) MLPQ-UT28 package and has a rated temperature range of -40 to +85°C. Typical Application Circuit SC286 CTL0A CTL1A CTL2A CTL3A CTL0A CTL1A CTL2A CTL3A CTL0B CTL1B CTL2B CTL3B CTL0B CTL1B CTL2B CTL3B AVINA VINA CAVINA0.1µF RAVINA1Ω PVINA AVINB VINB CAVINB0.1µF RAVINB1Ω PVINB PGNDB AGNDB PGNDA AGNDA PGOODB PGOODA CINA 22µF CINB 22µF RPGOODA 100kΩ RPGOODB 100kΩ COUTA 47µF LXA VOUTA VOUTA LA 1.0µH LB 1.0µH COUTB 47µF LXB VOUTB VOUTB SSA SSB CSSA 1nF CSSB 1nF Revision 2.0 1 © 2011 Semtech Corporation |
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