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DESCRIPTION

The device is a power supply controller specifically designed to provide a high performance DC/DC conversion for high current microprocessors. The device implements a dual-phase step-down controller with a 180° phase-shift between each phase. A precise 5-bit digital to analog converter (DAC) allows adjusting the output voltage from 0.800V to 1.550V with 25mV binary steps managing On-The-Fly VID code changes.

The high precision internal reference assures the selected output voltage to be within ±0.6. The high peak current gate drive affords to have fast switching to the external power mos providing low switching losses.

The device assures a fast protection against load over current and load over/under voltage. An internal crowbar is provided turning on the low side mosfet if an over-voltage is detected. In case of over-current, the system works in Constant Current mode.

■ 2 PHASE OPERATION WITH SYNCRHONOUS RECTIFIER CONTROL

■ ULTRA FAST LOAD TRANSIENT RESPONSE

■ INTEGRATED HIGH CURRENT GATE DRIVERS: UP TO 2A GATE CURRENT

■ TTL-COMPATIBLE 5 BIT PROGRAMMABLE OUTPUT FROM 0.800V TO 1.550V WITH 25mV STEPS

■ DYNAMIC VID MANAGEMENT

■ 0.6 OUTPUT VOLTAGE ACCURACY

■ 10 ACTIVE CURRENT SHARING ACCURACY

■ DIGITAL 2048 STEP SOFT-START

■ OVERVOLTAGE PROTECTION

■ OVERCURRENT PROTECTION REALIZED USING THE LOWER MOSFETS RdsON OR A SENSE RESISTOR

■ OSCILLATOR EXTERNALLY ADJUSTABLE AND INTERNALLY FIXED AT 200kHz

■ POWER GOOD OUTPUT AND INHIBIT FUNCTION

■ REMOTE SENSE BUFFER

■ PACKAGE: SO-28

APPLICATIONS

■ POWER SUPPLY FOR SERVERS AND WORKSTATIONS

■ POWER SUPPLY FOR HIGH CURRENT MICROPROCESSORS

■ DISTRIBUTED POWER SUPPLY