DESCRIPTION
The LTC®3250-1.5 is a charge pump step-down DC/DC converter that produces a 1.5V regulated output from a 3.1V to 5.5V input. The part uses switched capacitor fractional conversion to achieve a typical efficiency increase of 50% over that of a linear regulator. No inductors are required.

FEATURES
■ 3.1V to 5.5V Input Voltage Range
■ No Inductors
■ Li-Ion (3.6V) to 1.5V with 81% Efficiency
■ Low Noise Constant Frequency Operation
■ Output Voltage: 1.5V ±4%
■ Output Current: 250mA
■ Shutdown Disconnects Load from VIN
■ Low Operating Current: IQ = 35µA
■ Low Shutdown Current: ISD < 1µA
■ Oscillator Frequency = 1.5MHz
■ Soft-Start Limits Inrush Current at Turn-On
■ Short-Circuit and Overtemperature Protected
■ Low Profile (1mm) ThinSOTTM Package

APPLICATIONS
■ Handheld Computers
■ Cellular Phones
■ Digital Cameras
■ Handheld Medical Instruments
■ Low Power DSP Supplies