DESCRIPTION
The LTC®1530 is a high power synchronous switching regulator controller optimized for 5V to 1.3V-3.5V output applications. Its synchronous switching architecture drives two external N-channel MOSFET devices to provide high efficiency. The LTC1530 contains a precision trimmed reference and feedback system that provides worst-case output voltage regulation of ±2% over temperature, load current and line voltage shifts. Current limit circuitry senses the output current through the on-resistance of the topside N-channel MOSFET, providing an adjustable current limit without requiring an external low value sense resistor.

FEATURES
■ High Power Buck Converter from 5V or 3.3V Input
■ Adjustable Current Limit in S0-8 with Topside FET RDS(ON) Sensing
■ No External Sense Resistor Required
■ Hiccup Mode Current Limit Protection
■ Adjustable, Fixed 1.9V, 2.5V, 2.8V and 3.3V Output
■ All N-Channel MOSFET Synchronous Driver
■ Excellent Output Regulation: ±2% over Line, Load and Temperature Variations
■ High Efficiency: Over 95% Possible
■ Fast Transient Response
■ Fixed 300kHz Frequency Operation
■ Internal Soft-Start Circuit
■ Quiescent Current: 1mA; 45µA in Shutdown

APPLICATIONS
■ Power Supply for Pentium® II, AMD-K6®-2, SPARC, ALPHA and PA-RISC Microprocessors
■ High Power 5V to 1.3V-3.5V Regulators