L6711 Datasheet, PDF (1/38 Pages) STMicroelectronics – 3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs

L6711
3 PHASE CONTROLLER WITH DYNAMIC VID
AND SELECTABLE DACs
1 FEATURES
■ 2A INTEGRATED GATE DRIVERS
■ FULL DIFFERENTIAL CURRENT READING
ACROSS INDUCTOR OR LOW-SIDE
MOSFET
■ 0.5% OUTPUT VOLTAGE ACCURACY
■ 6 BIT PROGRAMMABLE OUTPUT FROM
0.8185V TO 1.5810V IN 12.5mV STEPS
■ 5 BIT PROGRAMMABLE OUTPUT FROM
0.800V TO 1.550V IN 25mV STEPS
■ DYNAMIC VID MANAGEMENT
■ ADJUSTABLE REFERENCE VOLTAGE
OFFSET
■ 3% ACTIVE CURRENT SHARING
ACCURACY
■ DIGITAL 2048 STEP SOFT-START
■ PROGRAMMABLE OVERVOLTAGE
PROTECTION
■ INTEGRATED TEMPERATURE SENSOR
■ CONSTANT OVER CURRENT PROTECTION
■ OSCILLATOR INTERNALLY FIXED AT
150kHz (450kHz RIPPLE)
■ OSCILLATOR EXTERNALLY ADJUSTABLE
■ OUTPUT ENABLE
■ INTEGRATED REMOTE SENSE BUFFER
■ TQFP48 7x7 PACKAGE WITH EXPOSED PAD
2 APPLICATIONS
■ HIGH CURRENT VRM/VRD FOR DESKTOP /
SERVER / WORKSTATION CPUs
■ HIGH DENSITY DC/DC CONVERTERS
Figure 1. Package
TQFP48 (exposed pad)
Table 1. Order Codes
Part Number
L6711
L6711TR
Package
TQFP48
TQFP48 in Tape & Reel
3 DESCRIPTION
The device implements a three phase step-down
controller with a 120° phase-shift between each
phase with integrated high current drivers in a
compact 7x7mm body package with exposed pad.
The device embeds selectable DAC: the output
voltage ranges from 0.8185V to 1.5810V with
12.5mV steps (VID_SEL=OPEN) or from 0.800V
to 1.550V with 25mV steps (VID_SEL=GND; VID5
drives an optional +25mV offset) managing dy-
namic VID with 0.5% accuracy over line and temp
variations. Additional programmable offset can be
added to the voltage reference with a single exter-
nal resistor.
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 Con-
stant Current mode until UVP.
Selectable current reading adds flexibility in sys-
tem design.
November 2004
Rev. 2
1/38