DESCRIPTION

The LTC®3542 is a high efficiency monolithic synchronous buck converter using a constant frequency, current mode architecture. Supply current during operation is only 26μA, dropping to

FEATURES

■ High Efficiency: Up to 96

■ High Peak Switch Current: 1000mA

■ Low Output Ripple (<20mVP-P Typical)

Burst Mode Operation: Only 26μA

■ Very Low Quiescent Current: Only 26μA

■ 2.5V to 5.5V Input Voltage Range

■ 2.25MHz Constant Frequency Operation

■ 1MHz to 3MHz External Frequency Synchronization

■ Low Dropout Operation: 100 Duty Cycle

■ No Schottky Diode Required

■ Internal Soft-Start Limits Inrush Current

■ 0.6V Reference Allows Low Output Voltages

■ Shutdown Mode Draws <1μA Supply Current

■ ±2 Output Voltage Accuracy

■ Current Mode Operation for Excellent Line and Load

Transient Response

■ Overtemperature Protected

■ Available in 6-Lead 2mm × 2mm DFN and Small TSOT

APPLICATIONS

■ Cellular Telephones

■ Wireless and DSL Modems

■ Digital Cameras

■ MP3 Players

■ PDAs and Other Handheld Devices