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PDF LX1673 Data sheet ( Hoja de datos )
| Número de pieza | LX1673 | |
| Descripción | High Frequency PWM Regulator | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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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
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
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)
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
1 page  
LX1673
TM ® High Frequency PWM Regulator
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C except where
otherwise noted and the following test conditions: VCC = 5V, VCCL = 5V, VC1=12V, LDVCC = 12V, TDRV = BDRV = 3000pF Load.
Parameter
Symbol
Test Condition
` UVLO AND SOFT-START (SS)
Start-Up Threshold (VC1, VCCL, LDVCC)
Start-Up Threshold (VCC)
Hysteresis VCC
SS Input Resistance
RSS
SS Shutdown Threshold
Hiccup Mode Duty Cycle
VSHDN
` LINEAR REGULATOR CONTROLLER
Voltage Reference Tolerance
Source Current
IHDRV
Sink Current
` DISABLE INPUTS
ILDRV
PWM Disable
DIS
LDO Disable
LDDIS
CSS = 0.1µF
VLDFB = .8V, COUT = 330µF
VOUT = 10V
VOUT = 0.4V
Threshold
Internal Pull down Resistance
Threshold
Internal Pull down Resistance
POWER GOOD
Drain to Source Voltage
Leakage
I = 3mA
LX1673
Min Typ Max
Units
4.0 V
4.0 4.25 4.5
V
0.1 V
20 KΩ
0.1 V
10 %
2
30
0.2
%
mA
mA
1V
80 KΩ
2.5 V
100 KΩ
0.4 V
0.05 µA
Note 1:
Note 2:
Note 3:
System Specification
Low duty cycle pulse testing techniques are used which maintain junction and case temperatures equal to the ambient temperature
Functionality over the –40 to 85 deg C operating temperature range is assured by design, characterization, and statistical process
control
Copyright © 2004
Rev 1.0, 3/18/2005
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page 
LX1673
TM ® High Frequency PWM Regulator
PRODUCTION DATA SHEET
APPLICATION NOTE CONSIDERATIONS
1. The minimum RSET resistor value is 1k ohm for the current
limit sensing. If this resistor becomes shorted, it will do
permanent damage to the IC.
2. A resistor has been put in series with the gate of the LDO
pass transistor to reduce the output noise level. The resistor
value can be changed to optimize the output transient
response versus output noise.
3. To delay the turn on of the LDO controller output, a
capacitor should be connected between the LDDIS pin and
the +5volts. The LDDIS input has a 100K pull down
resistor, which keeps the LDO active until this pin is pulled
high. During the power up sequence the capacitor connected
to the LDDIS pin will keep the LDO off until this capacitor,
being charge by the 100K pull down resistor, goes through
the low input threshold level.
4. . If current limit is not used connect the VS and VC pins
together and to VCC. Do not leave them floating. A floating VS
pin will result in operation resembling a hiccup condition.
Copyright © 2004
Rev 1.0, 3/18/2005
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LX1673.PDF ] | |
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