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LX1676-CLQ Datasheet

  • LX1676-CLQ

  • Mobile AMD AthlonTM VRM Controller

  • 16頁

  • MICROSEMI

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LX1676
I N T E G R A T E D
P R O D U C T S
Mobile AMD Athlon鈩?VRM Controller
P
RELIMINARY
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
High Current Biphase
Operation
Outputs As Low As 0.925V
鈥?Biphase LoadSHARE
TM
鈥?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
APPLICATIONS
The LX1676 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 (>25A) 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擄 out of phase.
A
synchronized
Transient
Correction Loop鈥?provides except-
ional 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.
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 will 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>
Patent numbers US6292378,US6285571,US6356063, US6605931
AMD Mobile Athlon鈩?or
Duron鈩?Processor Core
Voltage Supply
Voltage Regulator Modules
PRODUCT HIGHLIGHT
T r a n s ie n t C o r 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
LX1676
V in 6 to 2 4 V
Vout
LX1676
LX1676
PACKAGE ORDER INFO
T
J
(擄C)
0 to 70
PW
38-Pin
Plastic TSSOP
LQ
38-Pin
Plastic MLPQ
LX1676-CPW
LX1676-CLQ
Note: Available in Tape & Reel.
Append the letters 鈥淭R鈥?to the part number.
(i.e. LX1676-CLQTR)
Copyright
漏
2000
Revision: 0.4b, 9/14/2004
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1

LX1676-CLQ相關(guān)型號PDF文件下載

  • 型號
    版本
    描述
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  • 英文版
    ADVANCED PWM CONTROLLER
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    ADVANCED PWM CONTROLLER
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    PROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER
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    PROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER
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  • 英文版
    PROGRAMMABLE DC : DC CONTROLLER
    MICROSEMI
  • 英文版
    PROGRAMMABLE DC : DC CONTROLLER
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  • 英文版
    5 - BIT PROGRAMMABLE VOTAGE REFERENCE
    MICROSEMI
  • 英文版
    5 - BIT PROGRAMMABLE VOTAGE REFERENCE
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  • 英文版
    Multiple Output LoadSHARE? PWM
    MICROSEMI
  • 英文版
    Multiple Output LoadSHARE? PWM
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  • 英文版
    Multiple Output LoadSHARE PWM
    MICROSEMI
  • 英文版
    Multiple Output LoadSHARE PWM
    MICROSEMI ...

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