LTC1702AIGN

Dual 550kHz Synchronous 2-Phase Switching Regulator Controller

DESCRIPTION

The LTC®1702A is a dual switching regulator controlleroptimized for high efficiency with low input voltages. It includes two complete, on-chip, independent switching regulator controllers each designed to drive a pair of external N channel MOSFETs in a voltage mode feedback, synchronous

buck configuration. The LTC1702A uses a constant-frequency, true PWM design switching at 550kHz, minimizing external component size and cost and maximizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to BurstMode® operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.

FEATURES

■ Pin Compatible with the LTC1702 with Improved Current Limit Control

■ Two Sides Run Out-of-Phase to Minimize CIN

■ No External Current Sense Resistors

■ Excellent Output Regulation: 1% Total Output Accuracy

■ Two Independent Controllers in One Package

■ All N-Channel External MOSFET Architecture

■ 550kHz Switching Frequency Minimizes External Component Size

■ 1A to 25A Output Current per Channel

■ High Efficiency over Wide Load Current Range

■ Less Than 100µA Shutdown Current

■ Small 24-Pin Narrow SSOP Package

APPLICATION

■ Microprocessor, DSP Core and I/O Supplies

■ Multiple Logic Supply Generator

■ Distributed Power Applications

■ High Efficiency Power Conversion