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L6918A Datasheet(PDF) 1 Page - STMicroelectronics

No. de pieza L6918A
Descripción Electrónicos  5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
Download  35 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6918A Datasheet(HTML) 1 Page - STMicroelectronics

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L6918 L6918A
October 2002
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
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.
SO28
ORDERING NUMBERS: L6918D, L6918AD
L6918DTR, L6918ADTR
5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
PIN CONNECTIONS
1
3
2
4
5
6
7
8
9
18
17
16
15
19
20
10
11
12
13
14
24
23
22
21
25
26
27
28
LGATE1
VCCDR
PHASE1
FB
BOOT1
UGATE1
VSEN
VCC
SGND
COMP
ISEN1
PGNDS1
FBR
FBG
SYNC_IN
SLAVE_OK
SYNC / ADJ
VPROG_IN
BOOT2
PGOOD
UGATE2
PHASE2
LGATE2
PGND
OSC / INH / FAULT
ISEN2
PGNDS2
SYNC_OUT
1
3
2
4
5
6
7
8
9
18
17
16
15
19
20
10
11
12
13
14
24
23
22
21
25
26
27
28
LGATE1
VCCDR
PHASE1
FB
BOOT1
UGATE1
VPROG_OUT
VCC
SGND
COMP
ISEN1
PGNDS1
SYNC_OUT
SLAVE_OK
VID3
VID2
VID1
VID4
BOOT2
PGOOD
UGATE2
PHASE2
LGATE2
PGND
OSC / INH / FAULT
ISEN2
PGNDS2
VID0


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