L6711 datasheet(1/38 Pages) STMICROELECTRONICS

Part #	L6711

Description	3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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L6711

November 2004

1FEATURES

■ 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

2APPLICATIONS

■ HIGH CURRENT VRM/VRD FOR DESKTOP /

SERVER / WORKSTATION CPUs

■ HIGH DENSITY DC/DC CONVERTERS

3DESCRIPTION

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.

3 PHASE CONTROLLER WITH DYNAMIC VID

AND SELECTABLE DACs

Rev. 2

Figure 1. Package

Table 1. Order Codes

Part Number

Package

L6711

TQFP48

L6711TR

TQFP48 in Tape & Reel

TQFP48 (exposed pad)

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