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Applications
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Table 1.
February 2008
For further information contact your local STMicroelectronics sales office.
LTB Technology
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
High-Current VRM / VRD for desktop / server /
workstation CPUs
Graphic cards
Low-voltage, high-current power supplies
High-density DC-DC converters
Order code
Device summary
L6755
L6755
TR
®
enhances load transient
for VR10, VR11 and AM2 processor applications
VFQFPN40
VFQFPN40
Package
Rev 1
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
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 pre-
biased 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.
2/3/4 phase buck controller
VFQFPN40
Tape and reel
Packing
Tube
L6755
Data Brief
www.st.com
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