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STMicroelectronics - 5-BIT PROGRAMMABLE DUAL-PHASE CONTROLLER

Numéro de référence L6919E
Description 5-BIT PROGRAMMABLE DUAL-PHASE CONTROLLER
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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L6919E fiche technique
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
t(s25mV STEPS
cs DYNAMIC VID MANAGEMENT
us 0.6% OUTPUT VOLTAGE ACCURACY
ds 10% ACTIVE CURRENT SHARING ACCURACY
ro )s DIGITAL 2048 STEP SOFT-START
P t(ss OVERVOLTAGE PROTECTION
s OVERCURRENT PROTECTION REALIZED
te cUSING THE LOWER MOSFET'S RdsON OR A
le uSENSE RESISTOR
so rods OSCILLATOR EXTERNALLY ADJUSTABLE
AND INTERNALLY FIXED AT 200kHz
b Ps POWER GOOD OUTPUT AND INHIBIT
- O teFUNCTION
s REMOTE SENSE BUFFER
) les PACKAGE: SO-28
ct(s bsoAPPLICATIONS
u Os POWER SUPPLY FOR SERVERS AND
d -WORKSTATIONS
ro )s POWER SUPPLY FOR HIGH CURRENT
P t(sMICROPROCESSORS
te cs 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.
le duBLOCK DIAGRAM
Obso te ProPGOOD
OSC / INH
SGN D
PW M1
VCCD R
HS
BOO T 1
UGA T E1
PHAS E1
sole DIGITAL
Ob SOFT-START
VCC
VCC DR
TO TAL
C UR REN T
CH1
OCP
LS
CUR REN T
REA DIN G
L GAT E1
ISE N1
PGN DS1
VID 4
PGN D
VID 3
VID 2
VID 1
VID 0
DAC
CH2 OCP
CH1 OCP
CUR REN T
REA DIN G
PGN DS2
ISE N2
CH2
LS L GAT E2
OCP
32k
FB G
FB R
3 2k
3 2k
R EMO TE
32k
BUFFER
I FB
ERR OR
A MPL IF IER
PW M2
Vcc
HS
PHAS E2
U GA T E2
BOO T 2
VS EN
FB
COM P
V cc
September 2003
1/33

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