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LX1672 Datasheet

  • LX1672

  • Multiple Output LoadSHARE PWM

  • 358.81KB

  • 20頁

  • MICROSEMI

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LX1672
TM
廬
Multiple Output LoadSHARE鈩?PWM
P
RELIMINARY
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
The LX1672 is a highly integrated
power supply controller IC featuring
two PWM switching regulator stages
with an additional onboard linear
regulator driver.
The two constant frequency voltage-
mode PWM phases can be easily
configured as a single Bi-Phase high
current output, two independently
regulated outputs, or as a DDR memory
I/O supply with a tracking DDR
termination voltage supply. Power loss
and noise, due to the ESR of the input
capacitors, are minimized by operating
each PWM output 180擄 out of phase.
This architecture also minimizes
capacitor
requirements
while
maximizing regulator response.
In bi-phase operation, the high
current output utilizes a patented current
sharing architecture, called Forced
Current Sharing
鈥?/div>
, to allow accurate
current sharing without the use of
expensive current sense resistors.
This patented approach also gives
system designers maximum flexibility with
respect to MOSFET supply. Each phase
can utilize different supply voltages, for
efficient use of available supplies, while
programming the ratio of current pulled
from each using one of three methods (see
application section).
The LX1672 incorporates fully
programmable
soft-start
sequencing
capabilities.
Each output can be
configured to come up in any order
necessary as required by the application.
The LX1672 features an additional
Linear Regulator Driver output, which
when coupled with an inexpensive
MOSFET is capable of supplying up to 5A
for I/O, memory, and other supplies
surrounding today鈥檚 micro-processor
designs.
Each regulator voltage output is
programmed via a simple voltage-divider
network. The LX1672, utilizing MOSFET
RDS(ON) impedance, monitors maximum
current limit conditions, in each PWM
phase without the use of expensive current
sense resistors.
Up to Three Independently
Regulated Outputs
DDR Termination Compliant
Bi-phase Current Sharing
Outputs As Low As 0.8V
Generated From An Internal 1%
Reference
Multiphase High Current Output
Reduces Required Capacitance
Integrated High Current MOSFET
Drivers
300KHz, 500KHz and 600KHz
High Frequency Operation
Minimizes External Component
Requirements
Independent Phase Programmable
Soft-Start and Power Sequencing
Adjustable Linear Regulator Driver
Output
No current-sense resistors
APPLICATIONS/BENEFITS
Multi-Output Power Supplies
Video Card Power Supplies
DDR, VDDQ and Termination
Supply
PC Peripherals
Portable PC Processor and I/O
Supply
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
LoadSHARE is a Trademark of Microsemi Corporation
PRODUCT HIGHLIGHT
Refer to Typical
Application for
com plete circuit.
12V
5V
3.3V
LX1672
Graphics
Controller
DDR Term ination
Mem ory Core
....
Mem ory Bus
DDR Mem ory
LX1672
LX1672
I/O
T
A
(擄C)
0 to 70
0 to 70
0 to 70
Copyright
漏
2000
Rev. 0.3m, 2005-04-12
Switching
Frequency (kHz)
300
500
600
PW
PACKAGE ORDER INFO
Plastic TSSOP
28-Pin
LX1672-03CPW
LX1672-05CPW
LQ
Plastic MLPQ
38-Pin
LX1672-03CLQ
LX1672-06CLQ
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. LX1672-06CLQ-TR)
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1

LX1672相關(guān)型號PDF文件下載

  • 型號
    版本
    描述
    廠商
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  • 英文版
    ADVANCED PWM CONTROLLER
    MICROSEMI ...
  • 英文版
    ADVANCED PWM CONTROLLER
    MICROSEMI
  • 英文版
    ADVANCED PWM CONTROLLER
    MICROSEMI ...
  • 英文版
    SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC
    MICROSEMI ...
  • 英文版
    SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC
    MICROSEMI
  • 英文版
    SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC
    MICROSEMI ...
  • 英文版
    DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
    MICROSEMI
  • 英文版
    DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
    MICROSEMI ...
  • 英文版
    DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
    MICROSEMI
  • 英文版
    DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
    MICROSEMI ...
  • 英文版
    PROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER
    MICROSEMI
  • 英文版
    PROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER
    MICROSEMI ...
  • 英文版
    PROGRAMMABLE DC : DC CONTROLLER
    MICROSEMI
  • 英文版
    PROGRAMMABLE DC : DC CONTROLLER
    MICROSEMI ...
  • 英文版
    5 - BIT PROGRAMMABLE VOTAGE REFERENCE
    MICROSEMI
  • 英文版
    5 - BIT PROGRAMMABLE VOTAGE REFERENCE
    MICROSEMI ...
  • 英文版
    Multiple Output LoadSHARE? PWM
    MICROSEMI
  • 英文版
    Multiple Output LoadSHARE? PWM
    MICROSEMI ...
  • 英文版
    Multiple Output LoadSHARE PWM
    MICROSEMI
  • 英文版
    Multiple Output LoadSHARE PWM
    MICROSEMI ...

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