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Microsemi Corporation - High Frequency PWM Regulator

Numéro de référence LX1673
Description High Frequency PWM Regulator
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX1673 fiche technique
LX1673
TM ® High Frequency PWM Regulator
PRODUCTION DATA SHEET
DESCRIPTION
The LX1673 is a highly integrated With onboard gate drivers, the switching
power supply controller IC featuring one PWM output is capable of sourcing up to
www.PDWataMShesetw4Uit.cnheting regulator stage with an 15A. The LX1673 also features an
additional onboard linear regulator additional Linear Regulator Controller
driver.
output, which when coupled with an
With several switching frequencies inexpensive MOSFET is capable of
available (up to 900kHz) the LX1673 supplying up to an additional 5A for I/O,
can be optimized for both cost and PCB memory, and other supplies surrounding
space. Utilizing external com- today’s microprocessor designs.
pensation, a wide selection of external Each regulator output voltage is
components can be chosen for use in programmed via a simple voltage-divider
any application while maintaining network.
stable operation.
Integrated hiccup mode current limiting
The LX1673 incorporates a fully is implemented utilizing MOSFET RDS(ON)
programmable soft-start and power impedance. This enables the LX1673 to
sequence capabilities. The LDO and monitor maximum current limit conditions
PWM have independent enable pins. without the use of expensive current sense
resistors.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
KEY FEATURES
ƒ Two Independently Regulated
Outputs
ƒ Outputs As Low As 0.8V
Generated From An Internal 1%
Reference
ƒ Integrated High Current MOSFET
Drivers
ƒ 300KHz, 600KHz, and 900KHz
High Frequency Operation
Minimizes External Component
Requirements
ƒ Soft-Start and Power Sequencing
Control
ƒ Adjustable Linear Regulator Driver
Output
ƒ No current-sense resistors
APPLICATIONS/BENEFITS
ƒ Video Card Power Supplies
ƒ PC Peripherals
ƒ Computer Add-On Cards
ƒ 3.3V Power Conversion
ƒ DDR Memory Termination
+3.3V
Copyright © 2004
Rev 1.0, 3/18/2005
PWRGD
+3.3V
VOUT2
LDDIS
DIS
+5V
+12V
20 19 18 17 16
LDVCC PWGD VC1 TDRV PGND
1 15
LDGD
BDRV
2
LDFB
14
VCCL
3
LDDIS
4
DGND
LX1673
13
VCC
12
VS
5
AGND
11
CS
DIS SS EA+ EA- EAO
6 7 8 9 10
+5V
+5V
VOUT1
PACKAGE ORDER INFO
TA (°C)
PW LQSwitching
Frequency (kHz)
Plastic TSSOP
20-Pin
RoHS Compliant / Pb-free
Plastic MLPQ
20-Pin
RoHS Compliant / Pb-free
-40 to 85
300
LX1673-03CPW
LX1673-03CLQ
-40 to 85
-40 to 85
600
LX1673-06CPW
LX1673-06CLQ
900
LX1673-09CPW
LX1673-09CLQ
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1673-03CPW-TR)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1

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