ST L6756 User Manual

for VR10, VR11.1 and AM2 processor applications
Features
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 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
Applications
High-current VRM / VRD for desktop / server /
workstation CPUs
Graphic cards
Low-voltage, high-current power supplies
High-density DC / DC converters
®
enhances load transient
L6756
2/3/4 phase buck controller
Data Brief
VFQFPN40
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 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 pre­biased 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.
®
to
Table 1. Device summary
Order code Package Packing
L6756
VFQFPN40 Tube
L6756TR VFQFPN40 Tape & Reel
February 2008 Rev 1 1/3
For further information contact your local STMicroelectronics sales office.
www.st.com
3
Revision history L6756
1 Revision history
Table 2. Document revision history
Date Revision Changes
15-Feb-2008 1 Initial release.
2/3
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