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參數(shù)資料
| 型號： | LSP5503SEAC |
| 廠商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 470 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 475K |
| 代理商： | LSP5503SEAC |
LSP5503
3A Synchronous Step Down DC/DC Converter
1 of 12
Rev. 1.8
PIN ASSIGNMENT
8
5
6
7
1
2
3
4
SS
EN
COMP
FB
BS
IN
SW
Top View
GND
EXPOSED PAD
PIN DESCRIPTION
Name
No.
Description
BS
1
Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver.
Connect a 0.1uF capacitor between BS and SW.
IN
2
Input Supply. Bypass this pin to G with a low ESR capacitor. See Input Capacitor
in the Application Information section.
SW
3
Switch Output. Connect this pin to the switching end of the inductor.
GND
4
Ground.
FB
5
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.
COMP
6
Compensation Pin. See Stability Compensation in the Application Information
section.
EN
7
Enable Input. When higher than 2.5V, this pin turns the IC on. When lower than
1.3V, this pin turns the IC off. Output voltage is discharged when the IC is off. This
pin should not be left open.
SS
8
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from
SS to GND to set the soft-start period. A 0.1F capacitor sets the soft-start period
to 15ms. To disable the soft-start feature, leave SS unconnected.
TYPICAL APPLICATION
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
GENERAL DESCRIPTION
The LSP5503 is a monolithic synchronous buck
regulator. The device integrates 100m MOSFETS
that provide 3A continuous load cur-rent over a wide
operating input voltage of 4.5V to 27V. Current mode
control
provides
fast
transient
response
and
cycle-by-cycle cur-rent limit.
An adjustable soft-start prevents inrush current at turn
on. In shutdown mode, the supply cur-rent drops
below 1A.
This device, available in an SOP8L-EP package,
provides a very compact system solution with minimal
reliance on external components.
FEATURES
3A Output Current
Wide 4.5V to 27V Operating Input Range
Integrated 100m Power MOSFET Switches
Output Adjustable from 0.925V to 24V
Up to 96% Efficiency
Programmable Soft-Start
Stable with Low ESR Ceramic Output Capacitors
Fixed 400KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
SOP8L-EP Package
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.
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