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PDF LSP3123 Data sheet ( Hoja de datos )
| Número de pieza | LSP3123 | |
| Descripción | 150KHZ 3A PWM Buck DC/DC Converter | |
| Fabricantes | Lite-On | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LSP3123 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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Liteon Semiconductor Corporation
LSP3123
150KHZ 3A PWM Buck DC/DC Converter
FEATURES
Output voltage: 3.3V, 5.0V, 12V, and adjustable
output version
Adjustable version output voltage range:1.23V to
18V±4%
150KHz±15% fixed switching frequency
Voltage mode non-synchronous PWM control
Thermal-shutdown and current-limit protection
ON/OFF shutdown control input
Operating voltage can be up to 22V
Output load current: 3A
Low power standby mode
Built-in switching transistor on chip
TO220-5L TO263-5L and PDIP8L packages
APPLICATIONS
Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
GENERAL DESCRIPTION
The LSP3123 series are monolithic IC that design for
a step-down DC/DC converter, and own the ability of
driving a 3A load without additional transistor
component. Due to reducing the number of external
component, the board space can be saved easily.
The external shutdown function can be controlled by
logic level and then come into standby mode. The
internal compensation makes feedback control have
good line and load regulation without external design.
Regarding protected function, thermal shutdown is to
prevent over temperature operating from damage,
and current limit is against over current operating of
the output switch. If current limit function occurred and
VFB is down to 0.5V below, the switching frequency
will be reduced. The LSP3123 series operates at a
switching frequency of 150 KHz thus allowing smaller
sized filter components than what would be needed
with lower frequency switching regulators. Other
features include a guaranteed ±4% tolerance on
output voltage under specified input voltage and
output load conditions, and ±15% on the oscillator
frequency. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The packages are
available in a standard 5-lead TO-220 package, a
5-lead TO-263 package or 8-lead PDIP.
PIN CONFIGURATION
(1) TO220-5L
(Top View)
(2) TO263-5L
(Top View)
Metal Tab Gnd
(3) PDIP8L
(Top View)
GND GND GND GND
87 6 5
12 3
VIN OUTPUT FB
4
SD
5 SD
4 FB
3 GND
2 OUTPUT
1 VIN
5 SD
4 FB
3 GND
2 OUTPUT
1 VIN
Metal Tab Gnd
Symbol
TO220/TO263 PDIP
11
22
3 5~8
43
54
Name
Descriptions
Vin
Output
Gnd
FB
SD
Operating Voltage Input
Switching Output
Ground
Output Voltage Feedback Control
ON/OFF Shutdown
1/11 Rev1.2
1 page  
Liteon Semiconductor Corporation
LSP3123
150KHZ 3A PWM Buck DC/DC Converter
TYPICAL APPLICATION CIRCUITS
(1) Fixed Output Circuit
(2) Adjustable Output Circuit
Vout=VFB*(1+R1/R2); VFB=1.23V; R2=1K typical
5/11 Rev1.2
5 Page 
Symbol
A
B
C
C2
D
E
e
L
L1
L2
(3) PDIP8L
Liteon Semiconductor Corporation
LSP3123
150KHZ 3A PWM Buck DC/DC Converter
Dimensions In Millimeters
Min.
4.07
Nom.
4.46
Max.
4.85
0.51 0.84 1.02
0.36
0.50
0.74
1.14
1.27
1.65
8.20
9.15
9.65
9.65
10.16
10.67
1.57 1.71 1.85
14.45
15.24
15.88
1.78
2.54
2.79
2.92
Dimensions In Inches
Min.
0.163
Nom.
0.176
0.020
0.033
0.014
0.020
0.046
0.050
0.328
0.360
0.386
0.400
0.063
0.068
0.578
0.600
0.071
0.100
Max.
0.194
0.041
0.030
0.066
0.380
0.427
0.074
0.635
0.110
0.115
D
E-PIN 0.018inch
E
15°(4х )
P IN 7#°1(4INхD)E N T 0.025 D E E P 0 .006-0.008 Inch
C
eB
L
Se
B
B1
B2
Symbol
A
A1
A2
B
B1
B2
C
D
E
E1
e
L
eB
S
Dimensions In Millimeters
Min.
Nom.
Max.
5.33
0.38
3.1 3.30 3.5
0.36
0.46
0.56
1.4
1.52
1.65
0.81
0.99
1.14
0.20
0.25
0.36
9.02
9.27
9.53
7.62
7.94
8.26
6.15
6.35
6.55
2.54
2.92 3.3 3.81
8.38
8.89
9.40
0.71
0.84
0.97
11/11
Dimensions In Inches
Min.
Nom.
0.015
0.122
0.014
0.055
0.032
0.008
0.335
0.300
0.242
0.115
0.330
0.028
0.130
0.018
0.060
0.039
0.010
0.365
0.313
0.250
0.100
0.130
0.350
0.033
Max.
0.210
0.138
0.022
0.065
0.045
0.014
0.375
0.325
0.258
0.150
0.370
0.038
Rev1.2
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LSP3123.PDF ] | |
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