LTC3203B-1 Datasheet | Linear Technology

Features - Selectable Dual Mode Operation: 1:1.5 or 1:2 - High Output Current: Up to 500m A - Low Noise Constant Frequency (1MHz/0.9MHz) Operation- - VIN Range: 2.7V to 5.5V - Adjustable Output Voltage (LTC3203/LTC3203B) - User Selectable Fixed Output Voltages: 4.5V or 5V (LTC3203-1 and LTC3203B-1) - Burst Mode® Operation with IQ ~ 120µA (LTC3203/LTC3203-1) - Constant Freqency Operation at All Loads (LTC3203B/LTC3203B-1) - Soft-Start Limits Inrush Current at Turn-On - Short-Circuit/Thermal Protection - Shutdown Disconnects Load from Input - Shutdown Current: < 1µA - Available in a 10-pin (3mm × 3mm) DFN Package U APPLICATIO S - High Current LED Backlight Supply for Cellphones/PDAs - Cellphone Camera Light Supply - General Purpose 3.3V or Li-Ion to 5V Supply - USB ON THE GO(OTG) Devices LTC3203/LTC3203-1 LTC3203B/LTC3203B-1 500m A Output Current Low Noise Dual Mode Step-Up Charge Pumps DESCRIPTIO The LTC®3203/LTC3203-1/LTC3203B/LTC3203B-1 are low noise, high efficiency charge pump DC/DC converters capable of driving loads up to 500m A from a 2.7V to 5.5V input. Low external parts count (two flying capacitors and bypass capacitors at VIN and VOUT) make the LTC3203 family ideally suited for small, battery-powered applications. Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. The LTC3203/ LTC3203-1 feature Burst Mode operation at light load to achieve high efficiency whereas the LTC3203B/ LTC3203B-1 operate at constant frequency to achieve lowest noise operation. The LTC3203-1/LTC3203B-1 have a user selectable fixed output voltage of 4.5V or 5V to power LEDs or logic circuits. The FB pin of the LTC3203/LTC3203B can be used to program the desired output voltage. The parts are shortcircuit and overtemperature protected and are available in a low profile (3mm × 3mm) DFN...