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LX1677CLQ Datasheet

  • LX1677CLQ

  • Microsemi Corporation [AMD64 Processor VRM Controller]

  • 320.40KB

  • MICROSEMI

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LX1677
TM
庐
AMD64 Processor VRM Controller
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
High Current Biphase
Operation
Outputs As Low As 0.800V
鈥?Biphase LoadSHARE
TM
鈥?Transient Correction Loop鈩?/div>
Reduces Required
Capacitance
Differential Amplifier For
Remote Voltage Sensing
Integrated High Current
MOSFET Drivers
200KHz to 1MHz Frequency
Operation
Programmable Slew Rate
Control For Start-Up Sequence
and VID change
VID Changes On The Fly
Power Good Indicator
Short Circuit Protection
Output Over Voltage and
Under Voltage Protection
No current-sense resistors
APPLICATIONS
The LX1677 is a highly integrated
VRM power supply controller IC
featuring two PWM switching
regulator stages.
The two constant frequency
voltage-mode PWM phases are
configured as a single biphase high
current output core supply.
In biphase operation, the high
current (>35A) output is generated by
a LoadSHARE
TM
鈥?technique that
balances the currents in the two
phases. Power loss and noise, due to
the ESR of the input capacitors, are
minimized by operating the PWMs
180掳 out of phase.
A
synchronized
Transient
Correction
Loop鈥?/div>
provides
exceptional control of the output
droop and overshoot during very high
di/dt load changes, the circuit can be
configured for droop only, overshoot
only or both.
This architecture also minimizes
capacitor
requirements
while
maximizing regulator response.
A true differential input amplifier is
used for remote voltage sensing at the
processor core.
A VID code generator provides an
internal reference that will set the
output voltage. This VID code can be
changed during operation and the
reference will slew the output voltage to
its new setting at a preset rate. During
VID changes on the fly the Power Good
indication will stay valid.
The current through the lower phase
1 MOSFET will be sampled using its
R
DS(ON)
for current limit and shut
down.
For further protection, an over
voltage circuit will trip at a specified
setting and clamp the output by turning
off the upper MOSFETs and turning on
the lower MOSFETs.
The upper MOSFET drivers use a
bootstrap capacitor to provide the upper
drive voltage over the input voltage
range of 6 to 24 volts.
WWW .
Microsemi
.C
OM
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
鈥?/div>
Protected By US Patents: US6292378,US6285571
鈥?Protected By US Patents: US6825571, US6356063, US6605931
AMD Athlon 64鈩?and AMD
Opteron鈩?Processors
Processor Core Voltage Supply
Voltage Regulator Modules
PRODUCT HIGHLIGHT
T r a n s ie n t C o r e c tio n L o o p
V in + 5 V
V in 6 to 2 4 V
70nH
5 B it V ID
LX1677
V in 6 to 2 4 V
Vout
LX1677
LX1677
PACKAGE ORDER INFO
T
J
(掳C)
0 to 70
PW
Plastic TSSOP
38-Pin
LX1677CPW
LQ
Plastic MLPQ
38-Pin
LX1677CLQ
RoHS Compliant / Pb-free Transition DC: 0518
RoHS Compliant / Pb-free Transition DC: 0512
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part number. (i.e. LX1677CLQ-TR)
Copyright
漏
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

LX1677CLQ 产品属性

  • 3,000

  • 集成电路 (IC)

  • PMIC - 稳压器 - 专用型

  • -

  • 控制器，Intel VRM

  • 4.5 V ~ 5.5 V

  • 1

  • 0.8 V ~ 1.55 V

  • 0°C ~ 70°C

  • -

  • 38-MLPQ

  • 38-MLPQ

  • -

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