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SC185EULTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC185EULTRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 18 page  POWER MANAGEMENT June 18, 2010 4A Synchronous Step-Down Regulator SC185 Features V IN Range: 2.9 – 5.5V V OUT Options: 1.0V to 3.3V Up to 4A Output Current Ultra-Small Footprint, <1mm Height Solution 1.5MHz Switching Frequency Optional Power Save Mode Operation Efficiency Up to 95% Low Output Noise Across Load Range Excellent Transient Response Start Up into Pre-Bias Output 100% Duty-Cycle Low Dropout Operation <1µA Shutdown Current Externally Programmable Soft Start Time Power Good indicator Input Under-Voltage Lockout Output Over-Voltage, Current Limit Protection Over-Temperature Protection 3mm x 3mm x 0.6mm thermally enhanced MLPQ-UT16 package -40 to +85°C Temperature Range Pb-free, Halogen free, and RoHS/WEEE compliant Applications Desktop Computing Set-Top Box LCD TV Network Cards Printer Description The SC185 is a 4A synchronous step-down regulator designed to operate with an input voltage range of 2.9V to 5.5V. The device requires only three external filter components for a complete a step down regulator solution. The output voltage is factory predetermined with an available range of 1.0V to 3.3V. The SC185 is optimized for maximum efficiency over a wide range of load currents. During full load operation, the SC185 operates in PWM mode with fixed 1.5MHz oscillator frequency, allowing the use of small surface mount external components. As the load decreases, the regulator has the option to transition into Power Save mode maintaining high efficiency or stay in forced PWM mode operation. The SC185 offers output short circuit and thermal protection to safe guard the device under extreme operating conditions. The enable pin provides on/off control of the regulator. When connected to logic low, the device enters shutdown and consumes less than 1uA of current. Other protection features include programmable soft start with Power Good indicator, over voltage protection and under voltage lockout. The SC185 is available in a thermally-enhanced, 3mm x 3mm x 0.6mm MLPQ-UT16 package and has a rated temperature range of -40 to +85°C. Typical Application Circuit PGOOD PGND AVIN CIN 22µF VIN LX VOUT Enable SC185H PVIN EN AGND MODE VOUT 1.5V COUT 47µF L, 1.0µH Mode PGOOD CSS SS Fixed VOUT version C1 0.1µF R1 1 1,2 4 3 11,12,13,T 10 14,15,16 7 6 5 9 www.semtech.com 1 |
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