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SC189YEVB-3 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC189YEVB-3 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  June 01, 2009 POWER MANAGEMENT 2.5MHz, 1.5A Synchronous Step Down Regulator SC189 www.semtech.com 1 Typical Application Circuit GND EN CIN 10µF VIN 2.9V to 5.5V VOUT 1.20V/1.5A COUT 22µF L 1µH LX VOUT SC189C VIN Features V IN Range: 2.9 – 5.5V V OUT Options: 1.0 - 3.3V Up to 1.5A Output Current Ultra-Small Footprint, <1mm Height Solution 2.5MHz Switching Frequency Efficiency Up to 93% Low Output Noise Across Load Range Excellent Transient Response Start Up into Pre-Bias Output 100% Duty-Cycle Low Dropout Operation <1µA Shutdown Current Internal Soft Start Input Under-Voltage Lockout Output Over-Voltage, Current Limit Protection Over-Temperature Protection Adjustable Output Voltage Available in SOT23-5 package and 2mm x 2mm x 0.6mm thermally enhanced MLPD-UT6 package -40 to +85°C Temperature Range Fully WEEE and RoHS Compliant Applications Bluetooth Radios DSC and PMPs GPS Devices xDSL Systems POL Regulators Portable HDD Wireless LAN Description The SC189 is a high efficiency, synchronous step-down regulator providing up to 1.5A output current in either an ultra-small 2mm x 2mm, low profile package or a low cost SOT23-5 package. The device requires only three external filter components for a complete step down regulator solution. The input voltage range is 2.9 to 5.5V with either factory programmed outputs from 1.0 to 3.3V or adjustable output via an external resistor divider. The converter operates at fixed 2.5MHz switching frequency allowing small L/C filtering components. The voltage mode architecture is compatible with chip inductors and capacitors for minimum PCB footprint and lowest overall system cost. Total footprint of 25mm2 can be achieved - making the SC189 the ideal solution for high density systems. Solution height of <1mm is also possible. Up to 93% efficiency is achieved with low R DS(ON) internal switches. PWM constant frequency operation ensures low output ripple across the load range. 100% duty-cycle provides 360mV dropout voltage at 1.5A which extends the minimum input voltage for 2.5V and 3.3V outputs. Excellent transient response is achieved with no external compensation components. The SC189 provides input under-voltage, output over- voltage, output short circuit and over-temperature protection to safeguard the device and system under fault conditions. The regulator provides integrated soft-start to minimize inrush currents. Standby quiescient current is less than 1µA. The SC189 is available in SOT23-5 and a thermally enhanced 2mm x 2mm x 0.6mm MLPD-UT6 package rated from -40 to +85°C. SC189 L Chip CIN 0603 COUT 0805 Total PCB Area ~25mm2 Actual Size |
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