DESCRIPTION
The LTC®1622 is a constant frequency current mode stepdown DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage feature that shuts the LTC1622 down when the input voltage falls below 2V.

FEATURES
■ High Efficiency
■ Constant Frequency 550kHz Operation
■ VIN Range: 2V to 10V
■ Multiampere Output Currents
■ OPTI-LOOPTM Compensation Minimizes COUT
■ Selectable, Burst Mode Operation
■ Low Dropout Operation: 100% Duty Cycle
■ Synchronizable up to 750kHz
■ Current Mode Operation for Excellent Line and Load
   Transient Response
■ Low Quiescent Current: 350µA
■ Shutdown Mode Draws Only 15µA Supply Current
■ ±1.9% Reference Accuracy
■ Available in 8-Lead MSOP

APPLICATIONS
■ 1- or 2-Cell Li-Ion Powered Applications
■ Cellular Telephones
■ Wireless Modems
■ Portable Computers
■ Distributed 3.3V, 2.5V or 1.8V Power Systems
■ Scanners
■ Battery-Powered Equipment