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PDF LSP5522 Data sheet ( Hoja de datos )
| Número de pieza | LSP5522 | |
| Descripción | 2A Synchronous Step Down DC/DC Converter | |
| Fabricantes | Lite-On | |
| Logotipo |  |
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LSP5522
2A Synchronous
Step Down DC/DC Converter
Features
2A Output Current
Wide 4.5V to 23V Operating Input Range
Integrated Power MOSFET
Switches
Output Adjustable from 0.925V to 18V
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
Package SOP-8L
Applications
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
General Description
The LSP5522 is a monolithic synchronous
buck regulator. The device integrates
150mΩ MOSFETS that provide 2A
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. In shutdown mode, the
supply current drops below 1uA.
Green Electronics/ Appliances
Notebook Computers
Typical Application Circuit
V IN = 12V
R4
100K
C1
22uF
BS
VIN SW
LSP5522
EN FB
SS GND COMP
C3
0.1uF
C4
16nF
R3
10K
C5
NC
C6
10nF
L1
10uH
R1
4 4 .2 K
R2
10K
V OUT = 5V/2A
C7
22uF
x2
shows a sample LSP5522 application circuit generating 5V/2A output
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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Application Description
LSP5522
2A Synchronous
Step Down DC/DC Converter
V IN = 12V
R4
100K
C1
22uF
BS
VIN SW
LSP5522
EN FB
SS GND COMP
C6
10nF
L1
10uH
R1
4 4 .2 K
C3
0.1uF
C4
16nF
R3
10K
R2
C5 10K
NC
D1
B 1 3 0 /S K 1 3
(O ption)
VOUT = 5V/2A
C7
22uF
x2
shows a sample LSP5522 application circuit generating 1V/2A output.
Output Voltage Setting
VOUT
R1
FB
R2
Figure1. Output Voltage Setting
Figure 1 shows the connections for setting the output voltage. Select the proper ratio of the two
feedback resistors RFB1 and RFB2 based on the output voltage. Typically, use RFB2 ≈ 10KΩ and
determine RFB1 from the following equation:
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5 Page 
Marking Information
LOGO
LSC
LSP5522
VYYWWUZ
Part ID
LSP5522
2A Synchronous
Step Down DC/DC Converter
V YYWW UZ
Internal Code
Date code
YY Year(09=2009,10=2010,11=2011,12=2012...)
WW Week(01~53)
Output Voltage
Blank ADJ
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11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LSP5522.PDF ] | |
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