DESCRIPTION
The LTC®1649 is a high power, high efficiency switching regulator controller optimized for use with very low supply voltages. It operates from 2.7V to 5V input, and provides a regulated output voltage from 1.26V to 2.5V at up to 20A load current. A typical 3.3V to 2.5V application features efficiency above 90% from 1A to 10A load. The LTC1649 uses a pair of standard 5V logic-level N-channel external MOSFETs, eliminating the need for expensive P-channel or super-low-threshold devices.

FEATURES
■ High Power 3.3V to 1.XV-2.XV Switching Regulator Controller: Up to 20A Output
■ All N-Channel External MOSFETs
■ Provides 5V MOSFET Gate Drive with 3.3V Input
■ Constant Frequency Operation Minimizes Inductor Size
■ Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
■ High Efficiency: Over 90% Possible
■ No Low-Value Sense Resistor Needed
■ Available in 16-Lead SO Package

APPLICATIONS
■ 3.3V Input Power Supply for Low Voltage Microprocessors and Logic
■ Low Input Voltage Power Supplies
■ High Power, Low Voltage Regulators
■ Local Regulation for Multiple Voltage Distributed Power Systems