DESCRIPTION

The LTC®3423 and LTC3424 are high efficiency, fixed frequency, step-up DC/DC converters that can regulate output voltages as low as 1.5V from a single cell. An applied voltage of at least 2.7V to the VDD pin is required to power the internal control circuitry.

The devices include a 0.16Ω N-channel MOSFET switch and a 0.21ΩP-channel synchronous rectifier. The LTC3423 is intended for applications requiring less than 0.75W of output power and the LTC3424 for 1.5W or less. Switching frequencies up to 3MHz are programmed with an external timing resistor and the oscillator can be synchronized to an external clock.

FEATURES

■ 1.5V to 5.5V Adjustable Output Voltage

■ Synchronous Rectification: Up to 95% Efficiency

■ 1A Switch Current (LTC3423) or 2A Switch Current (LTC3424)

■ Fixed Frequency Operation Up to 3MHz

■ Wide Input Range: 0.5V to 5.5V (Operating)

■ Very Low Quiescent Current: 38µA (Burst Mode® Operation)

■ No External Schottky Diode Required

■ Synchronizable Switching Frequency

■ Burst Mode Enable Control

■ OPTI-LOOP® Compensation

■ Very Low Shutdown Current: <1µA

■ Small 10-Pin MSOP Package

APPLICATIONS

■ Pagers

■ Handheld Instruments

■ Cordless Phones

■ Wireless Handsets

■ GPS Receivers

■ Battery Backup