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PDF LX1736 Data sheet ( Hoja de datos )
| Número de pieza | LX1736 | |
| Descripción | VREF @ 800mV 900mA 1.0MHZ PWM a Current Mode PWM Buck regulator that switches to PFM mode under light loads | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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LX1736
www.DataSheet4U.com
TM ® VREF @ 800mV, 900mA, 1.0MHZ PWM
PRODUCTION DATA SHEET
DESCRIPTION
The LX1736 operates as a Current The regulator is capable of providing an
Mode PWM Buck regulator that output load current of 900mA and has
switches to PFM mode under light no minimum load current requirement
loads. The entire regulator function is for stable operation. Current limit
implemented with only a few, low- senses on a cycle-by cycle basis to
cost external components.
protect the switch. Power conversion
The LX1736 responds quickly to efficiency is maximized with PFM
dynamic load changes using a high mode of operation and low regulator
bandwidth error amplifier and internal quiescent current.
compensation. Tight output voltage The LX1736 operational supply voltage
regulation is maintained with the range covers 4.0V to 6.0V, features
temperature compensated 800mV, include: power on delay; soft start to
bandgap reference achieving +/-3.5% limit inrush currents and thermal
regulation tolerance for all line, load shutdown during fault conditions.
and thermal conditions. The output The 6-pin JEDEC MO-229 package
voltage is easily programmed, from provides a small form factor and low
800mV to 90% of VIN with two profile at 3x3x1mm with excellent
external resistors
power dissipation capability on surface
mount PCB’s.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
Few External Components
800mv Internal Reference
Tight Regulation over Line,
Load and Temperature
4.5V to 5.5V Input Range
Internal Soft Start Controls
Inrush Current
High Efficiency
Low Quiescent Current, 600μA
Fully Fault Protected
Thin MO-229, 6-Pin Package
APPLICATIONS
Point of Load Regulation
DSP, ASIC and Core Voltage
Supplies
Hard Disk Drives
Set Top Boxes
RoHS compliant product
4V to 6V
PRODUCT HIGHLIGHT
4 VPWR
N/C 6
5 VCC
4.7uF
2 GND
SW 3
FB 1
3.3uH
10.0K
17.8K
1.25V
@
875mA
30uF
Ground
Plane
Tie-in
Figure 1 – LX1736 Application Circuit and Typical Efficiency Performance
95%
85%
75%
65%
55%
45%
35%
25%
1
Efficiency @ VIN=5V,
VO=1.25V (Lower)
VO=3.3V (Upper)
10 100
OUTPUT CURRENT, mA
PACKAGE ORDER INFO
TA (°C)
Plastic MLPD
LD 6 pin 3mm x 3mm
RoHS Compliant / Pb-free
0 to 125
LX1736CLD
Note: Available in Tape & Reel. Append the letters “TR” to
the part number. (i.e. LX1736CLD-TR)
Package Marking
1x7x3x6x
MSC
Copyright © 2005
Rev. 1.0, 1/3/2007
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
1000
Page 1
1 page  
LX1736
www.DataSheet4U.com
TM ® VREF @ 800mV, 900mA, 1.0MHZ PWM
PRODUCTION DATA SHEET
APPLICATION PERFORMANCE
Dynamic Load Change Response
CH1 = Vout AC Coupled
CH2 = Load Switch
CH4 = Output Current, 100mA to 750mA
VIN=5V, L=3.3uH, COUT = 20uF
Start-up Inrush Current Control
CH1 = SW Pin
CH2 = Vout @ 3.32V
CH4 = Input Current
VIN=5V, No Output load, COUT = 20uF
VOUT Response to Short Circuit Removal
CH1 = Vout programmed at 1.2V
CH2 = Short CKT Duration
CH4 = Output Current
COUT = 20uF
Copyright © 2005
Rev. 1.0, 1/3/2007
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LX1736.PDF ] | |
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