GENERAL DESCRIPTION

The ADP1148 is part of a family of synchronous step-down switching regulator controllers featuring automatic sleep mode to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250 kHz using a constant off-time current-mode architecture.

FEATURES

Operation From 3.5 V to 18 V Input Voltage

Ultrahigh Efficiency > 95

Low Shutdown Current

Current Mode Operation for Excellent Line and Load Transient Response

High Efficiency Maintained Over Wide Current Range

Logic Controlled Micropower Shutdown

Short Circuit Protection

Very Low Dropout Operation

Synchronous FET Switching for High Efficiency

Adaptive Nonoverlap Gate Drives

APPLICATIONS

Notebook and Palmtop Computers

Portable Instruments

Battery Operated Digital Devices

Industrial Power Distribution

Avionics Systems

Telecom Power Supplies

GPS Systems

Cellular Telephones