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LX1671CLQ Datasheet

  • LX1671CLQ

  • Switching Regulator

  • 554.87KB

  • 21頁

  • ETC

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LX1671
I N T E G R A T E D
P R O D U C T S
Multiple Output LoadSHARE鈩?PWM
P
RELIMINARY
DESCRIPTION
KEY FEATURES
W W W.
Microsemi
.COM
The LX1671 is a highly integrated
power supply controller IC featuring
three PWM switching regulator stages
with an additional onboard linear
regulator driver.
Two of the constant frequency
voltage-mode PWM phases can be
easily configured for a single Bi-Phase
high current output or two in-
dependently regulated outputs. Each
phase incorporates a fully pro-
grammable soft-start sequence. This
versatility yields either three or four
independently regulated outputs with
full power sequencing capability giving
system
designers
the
ultimate
flexibility in power supply design.
In Bi-Phase operation, the high
current (>30A) output can utilize
different supply rails allowing Forced
Current Sharing
鈥?/div>
from different
sources. 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 re-
gulator response.
The additional outputs are capable of
supplying up to 5A (Linear Regulator
Driver) and 15A (Switching Regulator)
for I/O, memory, termination, and other
supplies surrounding today鈥檚 micro-
processor designs.
Each PWM regulator output is
programmed via a simple voltage-divider
network.
The LX1671, utilizing
MOSFET R
DS(ON)
impedance, monitors
current limit conditions, in each PWM
phase, without the use of expensive
current sense resistors.
The LX1671 was designed to give
design engineers maximum flexibility
with respect to the MOSFET supply.
Each phase can utilize different supply
voltages for efficient use of available
supply rails. Additionally, when two
phases are configured in Bi-Phase output,
the LoadSHARE
TM
topology can be
programmed via inductor ESR selection.
There are three other methods that can
also be used with LoadSHARE
TM
. These
other methods are presented in the theory
of operation section of this data sheet.
!
Up to Four Independently
Regulated Outputs
!
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 High Frequency Operation
Minimizes External Component
Requirements
!
Independent Phase Programmable
Soft-Start and Power Sequencing
!
Adjustable Linear Regulator Driver
Output
!
No current-sense resistors
!
DDR Termination Compliant
APPLICATIONS/BENEFITS
APPLICATIONS/BENEFITS
!
!
!
!
Multi-Output Power Supplies
Video Card Power Supplies
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
DDR Term ination
M em ory Core
....
Refer to Typical
A pplication for
com plete circuit.
12V
5V
3.3V
I/O
LX1671
Graphics
Controller
Core
M em ory Bus
DDR M em ory
LX1671
LX1671
T
A
(擄C)
擄
0 to 70
Copyright
錚?/div>
2000
Rev. 0.5i, 2002-07-17
PACKAGE ORDER INFO
Plastic TSSOP
Plastic MLPQ
PW
38-Pin
LQ
38-Pin
LX1671-CPW
LX1671-CLQ
Microsemi
Integrated Products, Power Management
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1

LX1671CLQ 產(chǎn)品屬性

  • 3,000

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • LoadSHARE™

  • 電壓模式

  • 4

  • 345kHz

  • 85%

  • 4.5 V ~ 5.5 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 0°C ~ 70°C

  • 38-MLPQ

  • -

  • LX1671 EVA KIT-ND - KIT EVAL FOR SWITCHING REGULATOR

LX1671CLQ相關(guān)型號PDF文件下載

  • 型號
    版本
    描述
    廠商
    下載
  • 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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