L6712 Datasheet, PDF (1/27 Pages) STMicroelectronics – TWO-PHASE INTERLEAVED DC/DC CONTROLLER

L6712
L6712A
TWO-PHASE INTERLEAVED DC/DC CONTROLLER
■ 2 PHASE OPERATION WITH
SYNCHRONOUS RECTIFIER CONTROL
■ ULTRA FAST LOAD TRANSIENT RESPONSE
■ INTEGRATED HIGH CURRENT GATE
DRIVERS: UP TO 2A GATE CURRENT
■ 3 BIT PROGRAMMABLE OUTPUT FROM
0.900V TO 3.300V OR WITH EXTERNAL REF.
■ ±0.9% OUTPUT VOLTAGE ACCURACY
■ 3mA CAPABLE AVAILABLE REFERENCE
■ INTEGRATED PROGRAMMABLE REMOTE
SENSE AMPLIFIER
■ PROGRAMMABLE DROOP EFFECT
■ 10% ACTIVE CURRENT SHARING ACCURACY
■ DIGITAL 2048 STEP SOFT-START
■ CROWBAR LATCHED OVERVOLTAGE PROT.
■ NON-LATCHED UNDERVOLTAGE PROT.
■ OVERCURRENT PROTECTION REALIZED
USING THE LOWER MOSFET'S R_dsON OR A
SENSE RESISTOR
■ OSCILLATOR EXTERNALLY ADJUSTABLE
AND INTERNALLY FIXED AT 150kHZ
■ POWER GOOD OUTPUT AND INHIBIT FUNCTION
■ PACKAGES: SO-28 & VFQFPN-36
APPLICATIONS
■ HIGH CURRENT DC/DC CONVERTERS
■ DISTRIBUTED POWER SUPPLY
BLOCK DIAGRAM
SO28
VFQFPN-36 (6x6x1.0)
Package
SO
VFQFPN
ORDERING NUMBERS:
Tube
Tape & Reel
L6712D, L6712AD L6712DTR, L6712ADTR
L6712Q, L6712AQ L6712QTR, L6712AQTR
DESCRIPTION
The device implements a dual-phase step-down con-
troller with a 180 phase-shift between each phase
optimized for high current DC/DC applications.
Output voltage can be programmed through the in-
tegrated DAC from 0.900V to 3.300V; program-
ming the "111" code, an external reference from
0.800V to 3.300V is used for the regulation.
Programmable Remote Sense Amplifier avoids
use of external resistor divider and recovers loss-
es along distribution line.
The device assures a fast protection against load
over current and Over / Under voltage.An internal
crowbar is provided turning on the low side mosfet
if Over-voltage is detected.
Output current is limited working in Constant Cur-
rent mode: when Under Voltage is detected, the
device resets, restarting operation.
PGOOD
BAND-GAP
REFERENCE
OSC / INH
SGND
PWM1
VCCDR
HS
BOOT1
UGATE1
PHASE1
March 2004
VID2
VID1
VID0
REF_IN/OUT
DAC
DIGITAL
SOFT-START
LOGIC AND
PROTECTIONS
VCC
VCCDR
CH1 OCP CH2 OCP
TOTAL
CURRENT
V_PROG
CH1
LS
OCP
CH2
OCP
CURRENT
READING
CURRENT
READING
LS
FBG
FBR
REMOTE
AMPLIFIER
PWM2
HS
ERROR
Vcc
AMPLIFIER
VSEN
DROOP FB
COMP
Vcc
LGATE1
ISEN1
PGNDS1
PGND
PGNDS2
ISEN2
LGATE2
PHASE2
UGATE2
BOOT2
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