SEMTECH SC189LSKTRT

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 it the ideal solution for high density systems. Solution height of <1mm is also possible. Up to 93% efficiency is achieved with low RDS(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. It provides input under-voltage, output overvoltage, 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. It is available in SOT23-5 and a thermally enhanced 2mm x 2mm x 0.6mm MLPD-UT6 package.

• VIN Range: 2.9 – 5.5V
• VOUT 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

• Bluetooth Radios
• DSC and PMPs
• GPS Devices
• xDSL Systems
• POL Regulators
• Portable HDD
• Wireless LAN