DESCRIPTION
The LTC®1779 is a constant frequency current mode stepdown DC/DC converter in a 6-lead ThinSOT package. The part operates with a 2.5V to 9.8V input and can provide up to 250mA of output current. Current mode control provides excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1779 when the input voltage falls below 2V.

FEATURES
■ High Efficiency: Up to 94%
■ 250mA Output Current
■ Wide VIN Range: 2.5V to 9.8V
■ 550kHz Constant Frequency Operation
■ Burst ModeTM Operation at Light Load
■ Low Dropout: 100% Duty Cycle
■ 0.8V Reference Allows Low Output Voltages
■ ±2.5% Reference Accuracy
■ Current Mode Operation for Excellent Line and Load Transient Response
■ Low Quiescent Current: 135µA
■ Shutdown Mode Draws Only 8µA Supply Current
■ Low Profile (1mm) ThinSOTTM Package

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