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  Microsemi Electronic Components Datasheet  

LX13049 Datasheet

1.0MHZ PWM

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LX13049
TM ® VREF @ 800mV, 1.25A, 1.0MHZ PWM
PRODUCTION DATA SHEET
DESCRIPTION
The LX13049 operates as a Current The regulator is capable of providing an
Mode PWM Buck regulator that output load current up to 1.25A 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 LX13049 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 LX13049 operational supply
regulation is maintained with the voltage range covers 4.0V to 6.0V,
temperature compensated 800mV, features include: power on delay; soft
bandgap reference achieving +/-3.5% start to 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
ƒ Few External Components
ƒ 800mv Internal Reference
ƒ Tight Regulation over Line,
Load and Temperature
ƒ 4.5V to 5.5V Input Range
ƒ Internal Soft Start Controls
Inrush Current
ƒ High Efficiency
ƒ Low Quiescent Current, 600μA
ƒ Fully Fault Protected
ƒ Thin MO-229, 6-Pin Package
APPLICATIONS
ƒ Point of Load Regulation
ƒ DSP, ASIC and Core Voltage
Supplies
ƒ Hard Disk Drives
ƒ Set Top Boxes
ƒ RoHS compliant product
VIN
4.5V to 5.5V
LX13049
VPWR
N/C
VCC Part SW
4.7µF
GND
FB
PRODUCT HIGHLIGHT
VOUT = (1 + R1/R2) * VFB
3.3µH
10.0K R1
1.25V @
1.2A
30µF
17.8K R2
Ground
Plane
Tie-in
95%
85%
75%
65%
55%
45%
35%
25%
1
Figure 1 – LX13049 Application Circuit and Typical Efficiency Performance
Efficiency @ VIN=5V,
VO=1.25V (Lower)
VO=3.3V (Upper)
10 100
OUTPUT CURRENT, mA
TA (°C)
PACKAGE ORDER INFO
Plastic MLPD
LD 6 pin 3mm x 3mm
Package Marking
RoHS Compliant / Pb-free
0 to 125
LX13049CLD
Note: Available in Tape & Reel. Append the letters “TR” to
the part number. (i.e. LX13049CLD-TR)
Copyright © 2007
Rev. 1.1, 5/2/2007
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
1000
Page 1


  Microsemi Electronic Components Datasheet  

LX13049 Datasheet

1.0MHZ PWM

No Preview Available !

LX13049
TM ® VREF @ 800mV, 1.25A, 1.0MHZ PWM
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VCC or VPWR) ..................................................................... -0.3V to 7.0V
SW to GND........................................................................................ -0.3V to (VIN + 0.3V)
VFB to GND................................................................................................... -0.3V to +2V
SW Peak Current .....................................................................................Internally Limited
Junction Operating Temperature Range........................................................0°C to +125°C
Storage Temperature Range, TA..................................................................-65°C to 150°C
Maximum Junction Temperature ............................................................................... 150°C
Package Peak Temp. for Solder Reflow (40 seconds max. exposure)........... 260°C (+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
PACKAGE PIN OUT
1
FB
2
GND
3
SW
6
NC
5
VCC
4
VPWR
LD PACKAGE
(Top View)
RoHS / Pb-free 100% matte Tin Pin Finish
THERMAL DATA
LD Plastic MLP 3x3mm MO-229, 6-Pin
THERMAL RESISTANCE-JUNCTION TO CASE, θJC
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
4°C/W
25 to 50°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of
the above assume no ambient airflow.
Name Pin #
VCC 5
VPWR 4
FB 1
GND 2
SW 3
FUNCTIONAL PIN DESCRIPTION
Description
Unregulated supply voltage input, ranging from +4V to 6.0V for internal analog control circuitry.
Unregulated supply voltage input (+4V to 6.0V), high current path, supplies PMOSFET Drain of PWM switch.
Feedback input for setting programming output voltage.
Circuit ground for IC analog circuitry and high frequency gate drive bias, can be connected to heatsink terminal.
Inductor and commutation diode connection point. Connects to internal PMOSFET Source of PWM Switch
output.
RECOMMENDED OPERATING CONDITIONS
Parameter
`
Input Operating Voltage Range
Continuous Output Current Range
Output Voltage Range
Operating Junction Temperature
Symbol
VIN
IOUT
VOUT
TJ
LX13049
Unit
Min Typ
Max
4.5 5.5 V
0 0.9 A
0.8 80% of VIN V
0 125 °C
Copyright © 2007
Rev. 1.1, 5/2/2007
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2


Part Number LX13049
Description 1.0MHZ PWM
Maker Microsemi
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