IR3523

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June 20, 2008

DATASHEET

DUAL OUTPUT CONTROL IC

DESCRIPTION

The IR3523 Control IC provides a full featured and flexible way to implement a complete dual output DDR &

CPU VTT multiphase power solution for Intel VR11.1 motherboards. Each output interfaces with any number of

xPHASE3

boot voltage and droop to implement the CPU VTT rail which is typically 1 phase. Output 2 includes a 3 bit VID for

margining and supports any number of phases and DDR DIMM modules. The xPHASE3

power supply that is smaller, less expensive, and easier to design while providing higher efficiency than

conventional approaches.

INDEPENDENT FEATURES FOR BOTH OUTPUT 1 & 2

•

Enable Input

•

Power Good (PG) Output

•

0.5% overall system set point accuracy

•

Programmable Softstart

•

High speed error amplifier with wide bandwidth of 30MHz and fast slew rate of 12V/us

•

Remote sense amplifier provides differential sensing and requires less than 50uA bias current

•

Programmable over current threshold triggers constant converter output current limit during start-up and

hiccup protection during normal operation

•

Over voltage condition communicated to phase ICs by IIN (ISHARE) and system by ROSC/OVP pins

•

Detection and protection of open remote sense lines

OUTPUT 1 ADDITIONAL FEATURES

•

3 bit Intel VR11.x VID (VID4, VID3, VID2)

•

Programmable VID offset

•

1.1 V Boot Voltage

•

Programmable output impedance

•

Programmable VID-on-the-Fly Slew Rate

OUTPUT 2 ADDITIONAL FEATURES

•

3 bit VID provides 1.5 V with ±150mV margining

•

Programmable VID-on-the-Fly Slew Rate

FEATURES SHARED BY BOTH OUTPUTS 1 & 2

•

Programmable per phase switching frequency of 250kHz to 1.5MHz

•

Daisy-chain digital phase timing provides accurate phase interleaving without external components

•

Gate Drive and IC bias linear regulator control with programmable output voltage and UVLO

•

Over voltage signal to system with over voltage detection during powerup and normal operation

ORDERING INFORMATION

Device

Package

Order Quantity

IR3523MTRPBF

40 Lead MLPQ (6 x 6 mm body)

3000 per reel

* IR3523MPBF

40 Lead MLPQ (6 x 6 mm body)

100 piece strips

* Samples only