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SC4626xEVB-1 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4626xEVB-1 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 21 page  April 23, 2009 POWER MANAGEMENT 2.5MHz, 1A Synchronous Step Down Regulator in SOT23-5 SC4626 www.semtech.com Typical Application Circuit Features V IN Range: 2.9 – 5.5V V OUT Options: .0 - 3.3V Up to A Output Current 2.5MHz Switching Frequency Efficiency Up to 93% Low Output Noise Across Load Range Excellent Transient Response Start Up into Pre-Bias Output 00% Duty-Cycle Low Dropout Operation <µA Shutdown Current Internal Soft Start Input Under-Voltage Lockout Output Over-Voltage, Current Limit Protection Over-Temperature Protection Adjustable Output Voltage SOT23-5 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 SC4626 is a high efficiency, synchronous step-down regulator providing up to A output current in a 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 .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. 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. 00% duty-cycle provides 300mV dropout voltage at A which extends the minimum input voltage for 2.5V and 3.3V outputs. Excellent transient response is achieved with no external compensation components. The SC4626 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 µA. The SC4626 is available in a SOT23-5 package rated for -40 to +85°C ambient temperature range. EN GND CIN 10µF VIN 2.9V to 5.5V VOUT 1.20V/1A COUT 10µF L 2.2µH LX VOUT Enable SC4626C VIN |
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Similar Description - SC4626xEVB-1 |
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