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PDF LSP3124 Data sheet ( Hoja de datos )

Número de pieza LSP3124
Descripción 150KHZ 3A PWM Buck DC/DC Converter
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No Preview Available ! LSP3124 Hoja de datos, Descripción, Manual

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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

1 page




LSP3124 pdf
Liteon Semiconductor Corporation
LSP3124
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
5/9 Rev1.2

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