L6756D datasheet(1/36 Pages) STMICROELECTRONICS

Part #	L6756D

Description	2/3/4 phase buck controller for VR10, VR11 and VR11.1 processor applications

PDF	36 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 36 page

October 2008

Rev 1

1/36

1

L6756D

2/3/4 phase buck controller

for VR10, VR11 and VR11.1 processor applications

Features

■ LTB Technology® enhances load transient

response

■ 2 to 4 scalable phase operation

■ Dual-edge asynchronous architecture

■ PSI# input with programmable strategy

■ Imon output

■ Flexible driver support

■ 7/8 bit programmable output - VR10/11.1 DAC

■ 0.5% output voltage accuracy

■ Full-differential current sense across DCR

■ Integrated remote sense buffer

■ Feedback disconnection protection

■ Adjustable oscillator from 100 kHz to 1 MHz

■ LSLess startup to manage pre-biased output

■ Programmable soft-start

■ Threshold sensitive enable pin for VTT

Sensing

■ VFQFPN40 6x6 mm package

Applications

■ High-current VRM / VRD for desktop / server /

workstation CPUs

■ Graphic cards

■ Low-voltage, high-current power supplies

■ High-density DC / DC converters

Description

L6756D is a two-to-four phase controller designed

to power Intel’s most demanding processors and,

most in general, low-voltage, high-current power

supplies. The device features LTB Technology® to

provide the fastest response to load transients

thus minimizing the output

filter composition.

L6756D embeds selectable DAC: output voltage

is programmable up to 1.6000 V (Intel VR10 and

VR11.x DACs) managing DVID transitions with

±0.5% output voltage accuracy over line, load and

temperature variations.

The device assures fast protection against load

over current and under / over voltage. Feedback

disconnection prevents from damaging the load in

case of misconnections in the system board.

Low-side-less start-up allows soft-start over pre-

biased output avoiding dangerous current return

through the main inductors as well as negative

spike at the load side.

L6756D is available in VFQFPN 6x6 mm package

VFQFPN40 6x6 mm

Table 1.

Device summary

Order code

Package

Packing

L6756D

VFQFPN40

Tube

L6756DTR

VFQFPN40

Tape and reel

www.st.com

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