L6755| Datasheet

L6755, L6755TR

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L6755
2/3/4 phase buck controller for VR10, VR11 and AM2 processor applications
Data Brief

Features

LTB Technology enhances load transient response 2 to 4 scalable phase operation Dual-edge asynchronous architecture Flexible driver support 7/8 bit programmable output - VR10/11 DAC 6 bit programmable output - AMD AM2 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 ouptut Programmable soft-start Threshold sensitive enable pin for VTT sensing VFQFPN40 7x7 mm package VFQFPN40

Description
L6755 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. L6755 embeds selectable DAC: Output Voltage is programmable up to 1.6000 V (Intel VR10 and VR11 DACs) or up to 1.550 V (AMD 6bit DAC) 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 prebiased output avoiding dangerous current return through the main inductors as well as negative spike at the load side. L6755 is available in VFQFPN40 7x7 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

Table 1.

Device summary
Order code Package VFQFPN40 VFQFPN40 Packing Tube Tape and reel

L6755 L6755TR

February 2008

Rev 1

1/3
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For further information contact your local STMicroelectronics sales office.