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STMicroelectronics - 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT

Numéro de référence L6919CDTR
Description 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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L6919CDTR fiche technique
L6919C
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 RdsON 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:L6919CD
L6919CDTR
DESCRIPTION
The device is a power supply controller specifically de-
signed to provide a high performance DC/DC conver-
sion for high current microprocessors. The device
implements a dual-phase step-down controller 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 managing On-The-Fly VID code changes.
The high precision internal reference assures the se-
lected 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 internal
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 Current mode.
BLOCK DIAGRAM
PGOO D
OSC / INH
S GN D
PW M1
VCC DR
HS
BO O T1
UGA T E1
PH AS E1
December 2002
VID 4
VID 3
VID 2
VID 1
VID 0
FB G
FB R
D IGITAL
SOF T-START
VCC
VCC DR
TO TA L
C U R R EN T
CH1
O CP
LS
CU R REN T
REA DIN G
D AC
C H 2 OC P
C H 1 OC P
32 k
3 2k
3 2k
R EMOTE
3 2k
BU FFE R
I FB
V SEN
FB
ERR OR
A MPL IF IER
CO M P
CH2
O CP
CU R REN T
REA DIN G
LS
PW M2
Vc c
Vcc
HS
LGAT E1
ISE N1
PGN DS1
PGN D
PGN DS2
ISE N2
LGAT E2
PH AS E2
U GA TE2
BO O T2
1/32

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