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參數資料
| 型號： | LX1677-CPWT |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO38 |
| 封裝： | PLASTIC, TSSOP-38 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 353K |
| 代理商： | LX1677-CPWT |
LX1677
PRELIMINARY DATA SHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
WWW
.Microse
m
i
.CO
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AMD64 Processor VRM Controller
I N T E GR A T ED
PRODUCT S
Copyright
2000
Rev 0.4a, 2003-03-03
DESCRIPTION
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 LoadSHARETM 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
° out of phase.
A
synchronized
Transient
Correction
Loop
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
RDS(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.
IMPORTANT:
For the most current data, consult MICROSEMI’s we bsite: http://www.microsemi.com
Patent numbers US6292378,US6285571,US6356063, US6605931
KEY FEATUR ES
High Current Biphase
Operation
Outputs As Low As 0.800V
Biphase LoadSHARE
TM
Transient Correction Loop
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
APPLI C ATION S
AMD Athlon 64 and AMD
Opteron Processors
Processor Core Voltage Supply
Voltage Regulator Modules
PRODUCT H I GHLIGHT
L X 16 77
5 B i t V I D
70n H
Tr a n s i e n t C o r e c t i on Loop
Vi n 6 t o 2 4 V
V out
Vi n + 5 V
PACKAGE ORDER INFO
TJ (°C)
PW
Plastic TSSOP
38-Pin
LQ
Plastic MLPQ
38-Pin
0 to 70
LX1677-CPW
LX1677-CLQ
Note: Available in Tape & Reel.
Append the letter “T” to the part number.
(i.e. LX1677-CLQT)
LL
XX
11
66
77
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