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PDF LSP5523 Data sheet ( Hoja de datos )
| Número de pieza | LSP5523 | |
| Descripción | 3A 27V Synchronous Buck Converter | |
| Fabricantes | Lite-On | |
| Logotipo |  |
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LSP5523
3A 27V Synchronous Buck Converter
General Description
The LSP5523 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 27V. 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 27V 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
Cycle by Cycle Over Current Protection
Short Circuit Protection
Input Under Voltage Lockout
Package： ESOP-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.
LSP5523 Rev. 1.1
1 of 15
www.liteonsemi.com
2014/8/27
1 page  
LSP5523
3A 27V Synchronous Buck Converter
Electrical Characteristics
(TA=25°C, unless otherwise specified)
Characteristics
Feedback Voltage
Feedback Overvoltage Threshold
High-Side Switch-On Resistance*
Low-Side Switch-On Resistance*
High-Side Switch Leakage
Upper Switch Current Limit
Lower Switch Current Limit
Symbol
VFB
COMP to Current Sense Limit
Transconductance
GCS
Error Amplifier Transconductance
Error Amplifier DC Gain*
Switching Frequency
Short Circuit Switching Frequency
Minimum Duty Cycle*
Maximum Duty Cycle
EN Shutdown Threshold Voltage
GEA
AVEA
fSW
Dmin
Dmax
EN Shutdown Threshold Voltage
Hysteresis
EN Lockout Threshold Voltage
EN Lockout Hysteresis
Supply Current in Shutdown
IC Supply Current in Operation
Input UVLO Threshold Rising
Input UVLO Threshold Hysteresis
Soft-start Current
Soft-start Period
Thermal Shutdown Temperature*
UVLO
Note : * Guaranteed by design, not tested.
Conditions
4.5V ≤ VIN ≤ 27V
VEN = 0V, VSW = 0V
Minimum Duty Cycle
From Drain to Source
ΔICOMP = ±10uA
VFB = 0
VEN Rising
VEN = 0
VEN = 3V, VFB = 1.0V
VEN Rising
VSS = 0V
CSS = 0.1uF
Hysteresis =25°C
Min
0.900
3.8
300
7.5
1.1
2.2
3.80
Typ
0.925
1.1
90
70
0.1
4.5
1.2
5.2
900
400
340
100
92
1.4
180
2.5
150
0.3
1.3
4.0
150
6
13
155
Max
0.950
10
380
2
2.7
3.0
1.5
4.40
Unit
V
V
mΩ
mΩ
uA
A
A
A/V
uA/V
V/V
KHz
KHz
%
%
V
mV
V
mV
uA
mA
V
mV
uA
mS
°C
LSP5523 Rev. 1.1
5 of 15
www.liteonsemi.com
2014/8/27
5 Page 
LSP5523
3A 27V Synchronous Buck Converter
Typical Characteristics
(Vin=12V, Io=0 mA, Temperature = 25 degree C, unless otherwise specified)
Light Load Operation (No load)
Vin=12V, Iin=8.2 mA, Vout=3,3V
Heavy Load Operation (3A Load)
Vin=12V, Vout=3,3V
Startup Vin=12V, Vout=3.3V, Iout=1A
through Vin.
through Enable.
Short Circuit Protection Vin=12V
LSP5523 Rev. 1.1
11 of 15
www.liteonsemi.com
2014/8/27
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LSP5523.PDF ] | |
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