lx1672 Microsemi Corporation, lx1672 Datasheet

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lx1672

Manufacturer Part Number
lx1672
Description
Multiple Output Loadshare Pwm
Manufacturer
Microsemi Corporation
Datasheet

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Part Number
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Part Number:
lx1672-03
Manufacturer:
EPONE
Quantity:
1
Copyright © 2000
Rev. 1.0, 2005-08-10
power supply controller IC featuring
two PWM switching regulator stages
with an additional onboard linear
regulator driver.
mode PWM phases can be easily
configured as a single Bi-Phase high
current
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° out of phase.
This
capacitor
maximizing regulator response.
current output utilizes a patented current
sharing architecture, called Forced
Current Sharing
current sharing without the use of
expensive current sense resistors.
IMPORTANT: For the most current data, consult MICROSEMI’s website:
U.S Patents: 6,285,571,6,292,378
The LX1672 is a highly integrated
The two constant frequency voltage-
In bi-phase operation, the high
NOTE: Available in Tape & Reel. Append the letters “TR” to the part number (i.e. LX1672-06CLQ-TR)
TM
architecture
T
0 to 70
0 to 70
0 to 70
A
output,
(°C)
requirements
, to allow accurate
two
Frequency (kHz)
complete circuit.
Refer to Typical
Application for
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
also
3.3V
Switching
12V
5V
independently
300
500
600
minimizes
D E S C R I P T I O N
while
LX1672
PW
RoHS Compliant / Pb-free Transition DC: 0518 RoHS Compliant / Pb-free Transition DC: 0512
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).
programmable
capabilities.
configured to come up in any order
necessary as required by the application.
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
designs.
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.
This patented approach also gives
The
The LX1672 features an additional
Each regulator voltage output is
P R O D U C T H I G H L I G H T
Integrated Products Division
Plastic TSSOP
28-Pin
PACKAGE ORDER INFO
LX1672
LX1672-03CPW
LX1672-05CPW
®
Microsemi
http://www.microsemi.com
Controller
Graphics
today’s
I/O
Each
soft-start
incorporates
DDR Termination
output
Memory Bus
Multiple Output LoadSHARE™ PWM
micro-processor
....
sequencing
can
P
fully
RODUCTION
be
DDR Memory
LQ
Memory Core
Plastic MLPQ
38-Pin
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
Multi-Output Power Supplies
Video Card Power Supplies
DDR, VDDQ and Termination
Supply
PC Peripherals
Portable PC Processor and I/O
Supply
APPLICATIONS/BENEFITS
D
ATA
LX1672-03CLQ
LX1672-06CLQ
K E Y F E A T U R E S
S
HEET
LX1672
Page 1

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