L6740L Datasheet, PDF (1/44 Pages) STMicroelectronics – Hybrid controller (4+1) for AMD SVID and PVID processors

L6740L
Hybrid controller (4+1) for AMD SVID and PVID processors
Features
■ Hybrid controller: compatible with PVI and SVI
CPUs
■ Dual controller: 2 to 4 scalable phases for CPU
CORE, 1 Phase for NB
■ Dual-Edge asynchronous architecture with
LTB technology^TM
■ PSI management to increase efficiency in
Light-Load conditions
■ Dual Over-Current protection:
Average and per-Phase
■ Load indicator (CORE section)
■ Voltage positioning
■ Dual remote sense
■ Adjustable independent reference offset
■ Feedback disconnection protection
■ Programmable OV protection
■ Oscillator internally fixed at 150kHz externally
adjustable
■ LSLess startup to manage Pre-biased output
■ Flexible driver support
■ HTQFP48 package
Applications
■ Hybrid High-Current VRM / VRD for Desktop /
Server / Workstation / IPC CPUs supporting
PVI and SVI interface
■ High-density DC / DC converters
HTQFP48
Description
L6740L is a hybrid CPU Power Supply Controller
compatible with both Parallel (PVI) and Serial
(SVI) protocols for AMD Processors.
The device embeds two independent control
loops for the CPU core and the integrated NB,
each one with its own set of protections. L6740L
is able to work in Single-Plane mode, addressing
only the CORE Section, according to the parallel
DAC codification. When in Dual-Plane mode, it is
compatible with the AMD SVI specification
addressing the CPU and NB voltages according
to the SVI bus commands.
The Dual-Edge Asynchronous Architecture is
optimized by LTB technology^TM allowing fast load-
transient response minimizing the output capaci-
tor and reducing the total BOM cost.
PSI management allows the device to selectively
turn-off phases when the CPU is in low-power
states increasing the over-all efficiency.
Fast protection against load over current is pro-
vided for both the Sections. Furthermore, feed-
back disconnection protection prevents from
damaging the load in case of misconnections in
the system board..
Table 1.
Device summary
Order codes
L6740L
L6740LTR
Package
HTQFP48
HTQFP48
Packaging
Tube
Tape and reel
August 2007
Rev 2
1/44
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