data brief for further information contact your local stmicroelectronics sales office. february 2008 rev 1 1/3 3 L6756 2/3/4 phase buck controller for vr10, vr11.1 and am2 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.x dac 6 bit programmable output - amd am2 dac 0.5 % output voltage accuracy full-differential curren t 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 applications high-current vrm / vrd for desktop / server / workstation cpus graphic cards low-voltage, high-current power supplies high-density dc / dc converters description L6756 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. L6756 embeds selectable dac: output voltage is programmable up to 1.6000 v (intel vr10 and vr11.x 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 pre- biased output avoiding dangerous current return through the main inductors as well as negative spike at the load side. L6756 is available in vfqfpn40 7x7 mm package. vfqfpn40 table 1. device summary order code package packing L6756 vfqfpn40 tube L6756 tr vfqfpn40 tape & reel www.st.com www..net
revision history L6756 2/3 1 revision history table 2. document revision history date revision changes 15-feb-2008 1 initial release.
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