L6919E Datasheet, PDF (1/33 Pages) STMicroelectronics – 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT

L6919E
5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER
WITH DYNAMIC VID MANAGEMENT
s 2 PHASE OPERATION WITH
SYNCRHONOUS RECTIFIER CONTROL
s ULTRA FAST LOAD TRANSIENT RESPONSE
s INTEGRATED HIGH CURRENT GATE
DRIVERS: UP TO 2A GATE CURRENT
s TTL-COMPATIBLE 5 BIT PROGRAMMABLE
OUTPUT FROM 0.800V TO 1.550V WITH
25mV STEPS
s DYNAMIC VID MANAGEMENT
s 0.6% OUTPUT VOLTAGE ACCURACY
s 10% ACTIVE CURRENT SHARING ACCURACY
s DIGITAL 2048 STEP SOFT-START
s OVERVOLTAGE PROTECTION
s OVERCURRENT PROTECTION REALIZED
USING THE LOWER MOSFET'S R_dsON OR A
SENSE RESISTOR
s OSCILLATOR EXTERNALLY ADJUSTABLE
AND INTERNALLY FIXED AT 200kHz
s POWER GOOD OUTPUT AND INHIBIT
FUNCTION
s REMOTE SENSE BUFFER
s PACKAGE: SO-28
APPLICATIONS
s POWER SUPPLY FOR SERVERS AND
WORKSTATIONS
s POWER SUPPLY FOR HIGH CURRENT
MICROPROCESSORS
s DISTRIBUTED POWER SUPPLY
SO-28
ORDERING NUMBERS:L6919E
L6919ETR
DESCRIPTION
The device is a power supply controller specifically
designed to provide a high performance DC/DC
conversion for high current microprocessors. The
device implements a dual-phase step-down con-
troller with a 180° phase-shift between each
phase. A precise 5-bit digital to analog converter
(DAC) allows adjusting the output voltage from
0.800V to 1.550V with 25mV binary steps manag-
ing On-The-Fly VID code changes.
The high precision internal reference assures the
selected output voltage to be within ±0.6%. 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 inter-
nal crowbar is provided turning on the low side
mosfet if an over-voltage is detected. In case of
over-current, the system works in Constant Cur-
rent mode.
BLOCK DIAGRAM
PGO O D
OSC / INH
SGN D
PW M1
VCCD R
HS
BOO T 1
UGA T E1
PHAS E1
September 2003
VID 4
VID 3
VID 2
VID 1
VID 0
FB G
FB R
DIGIT AL
SOFT- START
VCC
VCC DR
TO TAL
C UR REN T
CH1
LS
OCP
CUR REN T
REA DIN G
DAC
CH 2 OC P
CH1 OCP
32k
3 2k
I _FB
3 2k
R EMO TE
32k
BUFFER
VS EN
FB
ERR OR
A MPL IF IER
COM P
CH2
OCP
CUR REN T
REA DIN G
LS
PW M2
HS
Vcc
V cc
L GAT E1
ISE N1
PGN DS1
PGN D
PGN DS2
ISE N2
L GAT E2
PHAS E2
U GA T E2
BOO T 2
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