DESCRIPTION
The LTC®1159 series is a family of synchronous step-down switching regulator controllers featuring automatic Burst ModeTM operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.

FEATURES
■ Operation from 4V to 40V Input Voltage
■ Ultrahigh Efficiency: Up to 95%
■ 20µA Supply Current in Shutdown
■ High Efficiency Maintained Over Wide Current Range
■ Current Mode Operation for Excellent Line and Load Transient Response
■ Very Low Dropout Operation: 100% Duty Cycle
■ Short-Circuit Protection
■ Synchronous FET Switching for High Efficiency
■ Adaptive Non-Overlap Gate Drives
■ Available in SSOP and SO Packages

APPLICATIONS
■ Step-Down and Inverting Regulators
■ Notebook and Palmtop Computers
■ Portable Instruments
■ Battery-Operated Digital Devices
■ Industrial Power Distribution
■ Avionics Systems
■ Telecom Power Supplies