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LX1673 Datasheet, PDF (1/13 Pages) Microsemi Corporation – High Frequency PWM Regulator | |||
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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
PWM switching 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- todayâs 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 MICROSEMIâs website: http://www.microsemi.com
PRODUCT HIGHLIGHT
KEY FEATURES
 Two Independently Regulated
Outputs
 Outputs As Low As 0.8V
Generated From An Internal 1%
Reference
 Integrated High Current MOSFET
Drivers
 300KHz, 600KHz, and 900KHz
High Frequency Operation
Minimizes External Component
Requirements
 Soft-Start and Power Sequencing
Control
 Adjustable Linear Regulator Driver
Output
 No current-sense resistors
APPLICATIONS/BENEFITS
 Video Card Power Supplies
 PC Peripherals
 Computer Add-On Cards
 3.3V Power Conversion
 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)
Switching
Frequency (kHz)
PW
Plastic TSSOP
20-Pin
LQ
Plastic MLPQ
20-Pin
RoHS Compliant / Pb-free RoHS Compliant / Pb-free
-40 to 85
300
LX1673-03CPW
LX1673-03CLQ
-40 to 85
600
LX1673-06CPW
LX1673-06CLQ
-40 to 85
900
LX1673-09CPW
LX1673-09CLQ
Note: Available in Tape & Reel. Append the letters âTRâ 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
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