for VR10, VR11.1 and AM2 processor applications
Features
■ LTB technology
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
L6756
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