Buck Converter. LSP5503L Datasheet

LSP5503L Converter. Datasheet pdf. Equivalent

LSP5503L Datasheet
Recommendation LSP5503L Datasheet
Part LSP5503L
Description 3A 23V Synchronous Buck Converter
Feature LSP5503L; LSP5503L 3A 23V Synchronous Buck Converter General Description The LSP5503L is a monolithic synchron.
Manufacture LITE-ON
Datasheet
Download LSP5503L Datasheet




LITE-ON LSP5503L
LSP5503L
3A 23V Synchronous Buck Converter
General Description
The LSP5503L is a monolithic synchronous buck regulator. The device integrates 90 mΩ MOSFETS that
provide 3A continuous load current over a wide operating input voltage of 4.5V to 23V. Current mode control
provides fast transient response and cycle-by-cycle current limit. An adjustable soft-start prevents inrush
current at turn on.
Features
3A Output Current
Wide 4.5V to 23V Operating Input Range
Fixed 340KHZ Frequency
Integrated Power MOSFET Switches
Output Adjustable from 0.925V to 0.8Vin
Up to 93% Efficiency
Programmable Soft-Start
Stable with Low ESR Ceramic Output Capacitors
Over Current Protection
Short Circuit Protection
Input Under Voltage Lockout
PackageESOP-8L
Applications
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
Please be aware that an Important Notice concerning availability, disclaimers, and use in critical
applications of LSC products is at the end of this document.
LSP5503L Rev. 1.3
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2014/11/7



LITE-ON LSP5503L
LSP5503L
Block Diagram
FB 5
1.1V
0.3V
SS 8
0.925V
COMP 6
EN 7
2.5V
1.5V
3A 23V Synchronous Buck Converter
OVP
RAMP
OSCILLATOR
340/120KHz CLK
ERROR
AMPLIFIER
6uA
CURRENT
SENSE
AMPLIFIER
SQ
RQ
CURRENT
COMPARATOR
2 VIN
5V
1 BS
3 SW
EN OK
LOCKOUT
COMPARATOR
SHUTDOWN
COMPARATOR
1.2V
OVP
4 GND
IN<4.10V
IN
INTERNAL
REGULATORS
Ordering Information
LSP 5503L - XX X X
Packing
Output Voltage
Package
Package
R8 : ESOP-8L
LSP5503L Rev. 1.3
Output Voltage
Blank : ADJ
2 of 15
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Packing
A : Tape & Reel
2014/11/7



LITE-ON LSP5503L
LSP5503L
3A 23V Synchronous Buck Converter
Pin Assignment
BS 1
VIN 2
SW 3
GND 4
ESOP-8L
(TOP View)
Exposed
Pad on
Backside
8 SS
7 EN
6 COMP
5 FB
Pin Descriptions
Pin Name
1
2
3
4
5
6
7
8
Name
BS
VIN
SW
GND
FB
COMP
EN
SS
Exposed Pad
Pin Description
Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver.
Connect a 0.01uF capacitor between BS and SW.
Input Supply. Bypass this pin to GND with a low ESR capacitor. See Input Capacitor
in the Application Information section.
Switch Output. Connect this pin to the switching end of the inductor.
Ground.
Feedback Input. The voltage at this pin is regulated to 0.925V. Connect to the
resistor divider between output and ground to set output voltage.
Compensation Pin. See Stability Compensation in the Application Information
section.
Enable Input. When higher than 2.7V, this pin turns the IC on. When lower than
1.1V, this pin turns the IC off. Output voltage is discharged when the IC is off. This
pin should not be left open. Recommend to put a 150KW pull-up resistor to Vin for
startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from
SS to GND to set the soft-start period. A 0.1uF capacitor sets the soft-start period to
13ms. To disable the soft-start feature, leave SS unconnected.
Exposed Pad. Need to connect to GND pin.
LSP5503L Rev. 1.3
3 of 15
www.liteonsemi.com
2014/11/7







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