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Microsemi Corporation - AMD64 Processor VRM Controller

Numéro de référence LX1677
Description AMD64 Processor VRM Controller
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX1677 fiche technique
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LX1677
TM ® AMD64 Processor VRM Controller
PRODUCTION DATA SHEET
DESCRIPTION
The LX1677 is a highly integrated maximizing regulator response.
VRM power supply controller IC A true differential input amplifier is
featuring two PWM switching used for remote voltage sensing at the
regulator stages.
processor core.
The two constant frequency A VID code generator provides an
voltage-mode PWM phases are internal reference that will set the
configured as a single biphase high output voltage. This VID code can be
current output core supply.
changed during operation and the
In biphase operation, the high reference will slew the output voltage to
current (>35A) output is generated by its new setting at a preset rate. During
a LoadSHARETM† technique that VID changes on the fly the Power Good
balances the currents in the two indication will stay valid.
phases. Power loss and noise, due to The current through the lower phase
the ESR of the input capacitors, are 1 MOSFET will be sampled using its
minimized by operating the PWMs RDS(ON) for current limit and shut
180° out of phase.
down.
A synchronized Transient For further protection, an over
Correction
Loop†
provides voltage circuit will trip at a specified
exceptional control of the output setting and clamp the output by turning
droop and overshoot during very high off the upper MOSFETs and turning on
di/dt load changes, the circuit can be the lower MOSFETs.
configured for droop only, overshoot The upper MOSFET drivers use a
only or both.
bootstrap capacitor to provide the upper
This architecture also minimizes drive voltage over the input voltage
capacitor requirements while range of 6 to 24 volts.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected By US Patents: US6292378,US6285571
‡ Protected By US Patents: US6825571, US6356063, US6605931
V in + 5 V
PRODUCT HIGHLIGHT
T ra n s ie n t C o re c tio n L o o p
V in 6 to 2 4 V
70nH
5 B it V ID
LX1677
V in 6 to 2 4 V
KEY FEATURES
ƒ High Current Biphase
Operation
ƒ Outputs As Low As 0.800V
ƒ † Biphase LoadSHARETM
ƒ ‡ Transient Correction Loop™
Reduces Required
Capacitance
ƒ Differential Amplifier For
Remote Voltage Sensing
ƒ Integrated High Current
MOSFET Drivers
ƒ 200KHz to 1MHz Frequency
Operation
ƒ Programmable Slew Rate
Control For Start-Up Sequence
and VID change
ƒ VID Changes On The Fly
ƒ Power Good Indicator
ƒ Short Circuit Protection
ƒ Output Over Voltage and
Under Voltage Protection
ƒ No current-sense resistors
APPLICATIONS
ƒ AMD Athlon 64™ and AMD
Opteron™ Processors
ƒ Processor Core Voltage Supply
ƒ Voltage Regulator Modules
Vout
TJ (°C)
0 to 70
PACKAGE ORDER INFO
Plastic TSSOP
PW 38-Pin
Plastic MLPQ
LQ 38-Pin
RoHS Compliant / Pb-free Transition DC: 0518 RoHS Compliant / Pb-free Transition DC: 0512
LX1677CPW
LX1677CLQ
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1677CLQ-TR)
Copyright © 2000
Rev 1.1, 2003-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1

PagesPages 16
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