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DC/DC Converter. LSP3124 Datasheet

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DC/DC Converter. LSP3124 Datasheet






LSP3124 Converter. Datasheet pdf. Equivalent




LSP3124 Converter. Datasheet pdf. Equivalent





Part

LSP3124

Description

150KHZ 3A PWM Buck DC/DC Converter

Manufacture

Lite-On

Datasheet
Download LSP3124 Datasheet


Lite-On LSP3124

LSP3124; ␡ൣᐲࡋᆷ⅓⭥ᆀᴹ‫ޜ‬ਨ T EL:0755Ͳ82923906 FAX˖0755-61640813 H ttp://www.chuangyuxin.com Liteon Semic onductor Corporation LSP3124 150KHZ 3A PWM Buck DC/DC Converter „ z z z z z z z z z z z FEATURES Output voltage: 3. 3V, 5.0V, 12V, and adjustable output ve rsion Adjustable version output voltage range:1.23V to 18V±4% 150KHz±15% fix ed switching frequency Voltage mode non-synchron.


Lite-On LSP3124

ous PWM control Thermal-shutdown and cur rent-limit protection ON/OFF shutdown c ontrol input Operating voltage can be u p to 22V Output load current: 3A Low po wer standby mode Built-in switching tra nsistor on chip TO252-5L packages „ GENERAL DESCRIPTION „ z z z APPLICAT IONS Simple High-efficiency step-down r egulator On-card switching regulators P ositive to negative .


Lite-On LSP3124

converter The LSP3124 series are monoli thic IC that design for a step-down DC/ DC converter, and own the ability of dr iving a 3 A load without additio nal tr ansistor component. Due to reducing th e numb er o f e xternal component, the board s pace can be saved easily. The e xternal shutdown function can be contro lled by logic le vel a nd then come in to s tandby mod e..



Part

LSP3124

Description

150KHZ 3A PWM Buck DC/DC Converter

Manufacture

Lite-On

Datasheet
Download LSP3124 Datasheet




 LSP3124
␡ൣᐲࡋᆷ⅓⭥ᆀᴹ䲀ޜਨ
TEL:0755Ͳ82923906 FAX˖0755-61640813
Http://www.chuangyuxin.com
Liteon Semiconductor Corporation
LSP3124
150KHZ 3A PWM Buck DC/DC Converter
„ FEATURES
z Output voltage: 3.3V, 5.0V, 12V, and adjustable
output version
z Adjustable version output voltage range:1.23V to
18V±4%
z 150KHz±15% fixed switching frequency
z Voltage mode non-synchronous PWM control
z Thermal-shutdown and current-limit protection
z ON/OFF shutdown control input
z Operating voltage can be up to 22V
z Output load current: 3A
z Low power standby mode
z Built-in switching transistor on chip
z TO252-5L packages
„ APPLICATIONS
z Simple High-efficiency step-down regulator
z On-card switching regulators
z Positive to negative converter
„ GENERAL DESCRIPTION
The LSP3124 series are monolithic IC that design for
a step-down DC/DC converter, and own the ability of
driving a 3 A load without additio nal transistor
component. Due to reducing th e numb er o f e xternal
component, the board s pace can be saved easily.
The external shutdown function can be controlled by
logic le vel a nd then come in to s tandby mod e. T he
internal compensation mak es feedback control have
good line and load regulation without external design.
Regarding protected function, thermal shutdown is to
prevent over tempera ture operating from damag e,
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 LSP3124 series operates at a
switching frequency of 150 KHz thus allowing smaller
sized filter components than what wo uld be need ed
with lower frequency switching reg ulators. Oth er
features include a g uaranteed ±4% tolerance on
output voltage under specified input voltage and
output load conditions, and ±15% on the oscillator
frequency. The ou tput version include d fixe d 3 .3V,
5V, 12V, and an adjustable type. The package is
available in a standard 5-lead TO-252 package.
„ PIN CONFIGURATION
(Top View)
5
4
3
2
1
Metal Tab GND
SD
FB
GND
OUTPUT
VIN
Symbol Name
1 Vin
2 Output
3 Gnd
4 FB
5 SD
Descriptions
Operating Voltage Input
Switching Output
Ground
Output Voltage Feedback Control
ON/OFF Shutdown
1/9
Rev1.2
http://www.Datasheet4U.com





 LSP3124
Liteon Semiconductor Corporation
LSP3124
150KHZ 3A PWM Buck DC/DC Converter
„ ABSOLUTE MAXIMUM RATINGS
Symbol Paramrter
VCC Supply Voltage
VSD ON/OFF Pin input Voltage
VFB Feedback Pin Voltage
VOUT
Output Voltage to Ground
PD Power Dissipation
TST Storage Temperature
TOP Operating Temperature
VOP Operating Voltage
Rating
+24
-0.3 to +18
-0.3 to +18
-1
Internally Limited
-65 to +150
-40 to +125
+4.5 to +22
Unit
V
V
V
V
W
ɗ
ɗ
V
„ ELECTRICAL CHARACTERISTICS (ALL OUTPUT VOLTAGE VERSIONS)
Unless otherwise specified, VIN=12V for 3.3V,5V, adjustable version and VIN=18V for the 12V version. ILOAD=0.5A
Symbol Paramrter
IB Feedback bias current
FOSC Oscillator frequency
FCSP
Short Circuit Oscillator
Frequency
VSAT Saturation voltage
DC
Max.Duty Cycle(ON)
Min.Duty Cycle(OFF)
ICL Current limit
IL
IQ
ISTBY
Output=0
Output
leakage
Output=-1 current
Quiescent Current
Standby Quiesient
Current
VIL Low(OreNg/uOltFaForpin logic input
VIH threshold voltage
IH
ON/OFF pin logic input
current
IL
ON/OFF pin input
current
Conditions
VFB=1.3V(Adjustable
version only)
When Current Limit
Occur and
VFB0.5V, TA=25°C
IOUT=3A
no outside circuit
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
Peak current
no outside circuit
VFB=0V force driver on
no outside circuit
VFB=12V force driver off
VIN=22V
VFB=12V force driver off
ON/OFF Pin=5V
VIN=22V
ON)
High(regultaor OFF)
VLOGIC=2.5V(OFF)
VLOGIC=0.5V(ON)
Min.
-10
127
110
Typ.
150
10 30 50
0
3.6
3.4
70
2.0
5
1.3
Max.
-50
-100
173
173
1.4
1.5
100
6.9
7.5
-50
-30
10
200
250
0.6
-15
-5
Unit
nA
KHz
kHz
V
%
A
μA
mA
mA
μA
V
μA
șJC Thermal Resistence
TO252-5L
Junction
to case
10
ɗ/W
Thermal Resistence
șJA
with Copper Area of
Approximately 3 in2
TO252-5L
Junction
to ambient
50
ɗ/W
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
2/9 Rev1.2





 LSP3124
Liteon Semiconductor Corporation
LSP3124
150KHZ 3A PWM Buck DC/DC Converter
„ ELECTRICAL CHARACTERISTICS (CONTINUED)
Sy
LSP3124-ADJ
mbol
Parameter
VFB Output Feedback
Ș Efficiency
Conditions
5V”VIN”22V
0.2A”ILOAD”3A
VOUT programmed for
3V
VIN =12V, I LOAD =3A
Typ.
1.23
75
Limit
1.193/1.18
1.267/1.28
LSP3124-3.3V
VOUT
Output voltage
5.5V”VIN”22V
0.2A”ILOAD”3A
3.3
3.168/3.135
3.432/3.465
Ș Efficiency
VIN =12V, I LOAD =3A
75
LSP3124-5.0V
VOUT
Output voltage
8V”VIN”22V
0.2A”ILOAD”3A
5
4.8/4.75
5.2/5.25
Ș Efficiency
VIN =12V, I LOAD =3A
80
LSP3124-12V
VOUT
Output voltage
15V”VIN”22V
0.2A”ILOAD”3A
12
11.52/11.4
12.48/12.6
Ș Efficiency
VIN =16V, I LOAD =3A
90
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
„ BLOCK DIAGRAM
Unit
V
VMIN
VMAX
%
V
VMIN
VMAX
%
V
VMIN
VMAX
%
V
VMIN
VMAX
%
3/9 Rev1.2



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