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L6917

5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER

s

s

s

s

s

s

s

s

s

s

s

s

s

s

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 COMPLIANT WITH VRM 9.0

0.8% INTERNAL REFERENCE ACCURACY

10% ACTIVE CURRENT SHARING

ACCURACY

DIGITAL 2048 STEP SOFT-START

OVERVOLTAGE PROTECTION

OVERCURRENT PROTECTION REALIZED

USING THE LOWER MOSFET鈥橲 R

dsON

OR A

SENSE RESISTOR

300 kHz INTERNAL OSCILLATOR

OSCILLATOR EXTERNALLY ADJUSTABLE

UP TO 1MHz

POWER GOOD OUTPUT AND INHIBIT

FUNCTION

REMOTE SENSE BUFFER

PACKAGE: SO-28

SO-28

ORDERING NUMBERS: L6917D

L6917DTR (Tape & Reel)

APPLICATIONS

s

POWER SUPPLY FOR SERVER AND

WORKSTATION

s

POWER SUPPLY FOR HIGH CURRENT

MICROPROCESSORS

s

DISTRIBUTED POWER SUPPLY

DESCRIPTION

The device is a power supply controller specifically

designed to provide a high performance DC/DC con-

version for high current microprocessors.

The device implements a dual-phase step-down con-

troller with a 180擄 phase-shift between each phase.

A precise 5-bit digital to analog converter (DAC) al-

lows adjusting the output voltage from 1.100V to

1.850V with 25mV binary steps.

The high precision internal reference assures the se-

lected output voltage to be within

鹵0.8%.

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

or under voltage, the system works in HICCUP mode.

BLOCK DIAGRAM

ROSC / INH

SG ND

VCCDR

BOOT 1

PGO OD

2 PH ASE

OSCILLATOR

PWM1

UGATE1

LOGIC PWM

ADAPTIVE ANTI

CROSS-CONDUCTION

HS

PH ASE1

-

CURRENT

CORRECTION

+

CH 1 OVER

CU RR ENT

LG ATE1

LS

ISEN1

DIGI TAL

SO FT STA RT

VCC

VCC DR

LO GIC

AND

PROTECTIONS

TOTAL

CURR ENT

+

<>

CURRENT

READ ING

PGNDS 1

PGND

VID4

VID3

VID2

VID1

VID0

DAC

CH 2 OVER

CURR ENT

CH1 OVER

CU RR ENT

CURRENT

CORRECTION

AVG

CU RRENT

CURRENT

READ ING

PGNDS 2

ISEN2

CH 2 OVER

CU RR ENT

LG ATE2

LOGIC PWM

ADAPTIVE ANTI

CROSS-CONDUCTION

LS

1 0k

1 0k

1 0k

REMOT E

BUFFER

+

IFB

FBG

FBR

-

ERROR

AMPLIFIER

PH ASE2

PWM2

UGATE2

HS

10k

Vcc

BOOT 2

VSEN

FB

COMP

Vc c

October 2001

1/27

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