L6712_05 Datasheet, PDF (1/29 Pages) STMicroelectronics – TWO-PHASE INTERLEAVED DC/DC CONTROLLER

L6712
L6712A
TWO-PHASE INTERLEAVED DC/DC CONTROLLER
1 Features
■ 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
1.1 Applications
■ HIGH CURRENT DC/DC CONVERTERS
■ DISTRIBUTED POWER SUPPLY
2 Description
The device implements a dual-phase step-down con-
troller with a 180 phase-shift between each phase
Figure 1. Packages
SO28
VFQFPN-36 (6x6x1.0mm)
Table 1. Order Codes
Package
SO
VFQFPN
Tube
L6712D,
L6712AD
L6712Q,
L6712AQ
Tape & Reel
L6712DTR,
L6712ADTR
L6712QTR,
L6712AQTR
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.
June 2005
Rev. 3
1/29