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L6918 L6918A

5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER

s

s

s

s

s

s

s

s

s

s

OUTPUT CURRENT IN EXCESS OF 100A

ULTRA FAST LOAD TRANSIENT RESPONSE

REMOTE SENSE BUFFER

INTEGRATED 2A GATE DRIVERS

5 BIT VID VOLTAGE POSITIONING, VRM 9.0

0.6% INTERNAL REFERENCE ACCURACY

DIGITAL 2048 STEP SOFT-START

OVP & OCP PROTECTIONS

Rdson or Rsense CURRENT SENSING

1200KHz EFFECTIVE SWITCHING

FREQUENCY, EXTERNALLY ADJUSTABLE

POWER GOOD OUTPUT AND INHIBIT

PACKAGE: SO28

DESCRIPTION

L6918A is a master device that it has to be combined

with the L6918,slave, realizing a 4-phases topology,

interleaved. The device kit is specifically designed to

provide a high performance/high density DC/DC con-

version for high current microprocessors and distrib-

uted power. Each device implements a dual-phase

step-down controller with a 180擄 phase-shift between

each phase.

A precise 5-bit DAC allows adjusting the output volt-

age from 1.100V to 1.850V with 25mV binary steps.

The high peak current gate drives affords to have

high system switching frequency, typically of

1200KHz, and higher by external adjustement.

The device kit assure a fast protection against OVP,

UVP and OCP. An internal crowbar, by turning on the

low side mosfets, eliminates the need of external pro-

tection. In case of over-current, the system works in

Constant Current mode.

SO28

ORDERING NUMBERS: L6918D, L6918AD

L6918DTR, L6918ADTR

s

s

APPLICATIONS

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HIGH DENSITY DC-DC FOR SERVERS AND

WORKSTATIONS

SUPPLY FOR HIGH CURRENT

MICROPROCESSORS

DISTRIBUTED POWER

s

s

PIN CONNECTIONS

LGATE1

VCCDR

PHASE1

UGATE1

BOOT1

VCC

SGND

COMP

FB

VPROG_OUT

SYNC_OUT

SLAVE_OK

ISEN1

PGNDS1

1

2

3

4

5

28

27

26

25

24

PGND

LGATE2

PHASE2

UGATE2

BOOT2

PGOOD

VID4

VID3

VID2

VID1

VID0

OSC / INH / FAULT

ISEN2

PGNDS2

LGATE1

VCCDR

PHASE1

UGATE1

BOOT1

VCC

SGND

COMP

FB

VSEN

FBR

FBG

ISEN1

PGNDS1

1

2

3

4

5

6

28

27

26

25

24

23

PGND

LGATE2

PHASE2

UGATE2

BOOT2

PGOOD

VPROG_IN

SYNC_IN

SLAVE_OK

SYNC / ADJ

SYNC_OUT

OSC / INH / FAULT

ISEN2

PGNDS2

L6918A

(

Master)

6

7

8

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10

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13

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23

22

21

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19

18

17

16

15

L6918

7

8

9

10

11

12

13

14

(Slave)

22

21

20

19

18

17

16

15

October 2002

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