DESCRIPTION
The LTC®3422 is a high efficiency, current mode, fixed frequency, step-up DC/DC converter with true output disconnect and inrush current limiting. The part is guaranteed to start up from an input voltage of 1V. The device includes a 0.20Ω N-channel MOSFET switch and a 0.24Ω P-channel MOSFET synchronous rectifier. The output voltage, switching frequency, soft-start time, Burst Mode threshold and loop compensation are all simply programmed using tiny external passive components.

FEATURES
■ 700mA Continuous/1A Pulsed Output Current
   for Li-Ion to 5V Applications
■ Synchronous Rectification: Up to 96% Efficiency
■ True Output Disconnect
■ Inrush Current Limiting
■ Adjustable Automatic Burst Mode® Operation
■ Low Noise, Fixed Frequency Operation from
   100kHz to 3MHz
■ 0.5V to 4.5V Input Range
■ 2.25V to 5.25V Adjustable Output Voltage
■ Guaranteed 1V Start-Up
■ Programmable Soft-Start
■ Synchronizable Oscillator
■ Low Quiescent Current: 25µA
■ <1µA Shutdown Current
■ Anti-Ringing Control
■ Small (3mm × 3mm × 0.75mm) Thermally Enhanced
   10-Pin DFN Package

APPLICATIONS
■ Wireless Handsets
■ Handheld Computers
■ GPS Receivers
■ MP3 Players