L6918 Datasheet, PDF (1/35 Pages) STMicroelectronics – 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER

L6918 L6918A
5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
s OUTPUT CURRENT IN EXCESS OF 100A
s ULTRA FAST LOAD TRANSIENT RESPONSE
s REMOTE SENSE BUFFER
s INTEGRATED 2A GATE DRIVERS
s 5 BIT VID VOLTAGE POSITIONING, VRM 9.0
s 0.6% INTERNAL REFERENCE ACCURACY
s DIGITAL 2048 STEP SOFT-START
s OVP & OCP PROTECTIONS
s Rdson or Rsense CURRENT SENSING
s 1200KHz EFFECTIVE SWITCHING
FREQUENCY, EXTERNALLY ADJUSTABLE
s POWER GOOD OUTPUT AND INHIBIT
s PACKAGE: SO28
APPLICATIONS
s HIGH DENSITY DC-DC FOR SERVERS AND
WORKSTATIONS
s SUPPLY FOR HIGH CURRENT
MICROPROCESSORS
s DISTRIBUTED POWER
PIN CONNECTIONS
SO28
ORDERING NUMBERS: L6918D, L6918AD
L6918DTR, L6918ADTR
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° 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.
LGATE1
1
VCCDR
2
PHASE1
3
UGATE1
4
BOOT1
5
VCC
6
SGND
7
COMP
8
FB
9
VPROG_OUT
10
SYNC_OUT
11
SLAVE_OK
12
ISEN1
13
PGNDS1
14
October 2002
28
PGND
LGATE1
1
27
LGATE2
VCCDR
2
26
PHASE2
PHASE1
3
25
UGATE2
UGATE1
4
24
BOOT2
BOOT1
5
23
PGOOD
VCC
6
22
VID4
SGND
7
21
VID3
COMP
8
20
VID2
FB
9
19
VID1
VSEN
10
18
VID0
FBR
11
17
OSC / INH / FAULT
FBG
12
16
ISEN2
ISEN1
13
15
PGNDS2
PGNDS1
14
28
PGND
27
LGATE2
26
PHASE2
25
UGATE2
24
BOOT2
23
PGOOD
22
VPROG_IN
21
SYNC_IN
20
SLAVE_OK
19
SYNC / ADJ
18
SYNC_OUT
17
OSC / INH / FAULT
16
ISEN2
15
PGNDS2
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