LTC1430ACGN

IC SW REG CNTRLR STEP-DWN 16SSOP

DESCRIPTION

The LTC®1430A is a high power, high efficiency switching regulator controller optimized for 5V to 1.xV-3.xV applications. It includes a precision internal reference and an internal feedback system that can provide output regulation of ±1% over temperature, load current and line voltage shifts. The LTC1430A uses a synchronous switching architecture with two N-channel output devices, eliminating the need for a high power, high cost P-channel device. Additionally, it senses output current across the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without an external low value sense resistor.

FEATURES

■ High Power 5V to 1.xV-3.xV Switching Controller: Can Exceed 10A Output

■ Maximum Duty Cycle > 90% Permits 3.3V to 2.xV Conversion Using a Low Power 5V Supply

■ All N-Channel External MOSFETs

■ Fixed Frequency Operation—Small L

■ Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations

■ High Efficiency: Over 95% Possible

■ No Low Value Sense Resistor Needed

■ Outputs Can Drive External FETs with Up to 10,000pF Gate Capacitance

■ Quiescent Current: 350µA Typ, 1µA in Shutdown

■ Fast Transient Response

■ Adjustable or Fixed 3.3V Output

■ Available in 8-Lead SO and 16-Lead GN and SO Packages

APPLICATIONS

■ Power Supply for Pentium® II and AMD-K6® Microprocessors

■ High Power 5V to 3.xV Regulators

■ Local Regulation for Dual Voltage Logic Boards

■ Low Voltage, High Current Battery Regulation