Converter. LSP3122 Datasheet

LSP3122 Datasheet PDF


Part

LSP3122

Description

150KHZ 3A PWM Buck DC/DC Converter

Manufacture

Lite-On

Page 11 Pages
Datasheet
Download LSP3122 Datasheet


LSP3122 Datasheet
Liteon Semiconductor Corporation
LSP3122
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
37V±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 40V
Output load current: 3A
Low power standby mode
Built-in switching transistor on chip
TO220-5L TO252-5L and TO263-5L packages
APPLICATIONS
Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
PIN CONFIGURATION
(1) TO220-5L
(Top View)
GENERAL DESCRIPTION
The LSP3122 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. The LSP3122 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
5-lead TO252 package and a 5-lead TO-263
package.
(2) TO252-5L
(Top View)
Metal Tab Gnd
5 SD
4 FB
3 GND
2 OUTPUT
1 VIN
5
4
3
2
1
Metal Tab GND
SD
FB
GND
OUTPUT
VIN
(3) TO263-5L
(Top View)
5 SD
4 FB
3 GND
2 OUTPUT
1 VIN
Symbol
1
2
3
4
5
Name
Vin
Output
Gnd
FB
SD
Descriptions
Operating Voltage Input
Switching Output
Ground
Output Voltage Feedback Control
ON/OFF Shutdown
Metal Tab Gnd
1/11 Rev1.2

LSP3122 Datasheet
Liteon Semiconductor Corporation
LSP3122
150KHZ 3A PWM Buck DC/DC Converter
BLOCK DIAGRAM
SD
5
Current
Source
bias
1.235V
Ref erence
2.5V
Regulator
Start up
FB 4
+
Amp
-
Frequency
compensation
220mV
220mV
1 VIN
-
Comp
+
Comp+
-
Comp-
+
Pre-driver
150KHz
OSC.
Thermal
Limit
3A
Sw itch
2 OUTPUT
3 GND
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
VSD
VFB
VOUT
PD
TST
TOP
VOP
Paramrter
Supply Voltage
ON/OFF Pin input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
Storage Temperature
Operating Temperature
Operating Voltage
Rating
+45
-0.3 to +25
-0.3 to +25
-1
Internally Limited
-65 to +150
-40 to +125
+4.5 to +40
Unit
V
V
V
V
W
V
2/11 Rev1.2


Features Datasheet pdf Liteon Semiconductor Corporation LSP3122 150KHZ 3A PWM Buck DC/DC Converter FE ATURES Output voltage: 3.3V, 5.0V, 12V, and adjustable output version Adjustab le version output voltage range:1.23V t o 37V±4% 150KHz±15% fixed switching f requency Voltage mode non-synchronous P WM control Thermal-shutdown and current -limit protection ON/OFF shutdown contr ol input Operating voltage can be up to 40V Output load current: 3A Low power standby mode Built-in switching transis tor on chip TO220-5L TO252-5L and TO263 -5L packages APPLICATIONS Simple High-e fficiency step-down regulator On-card s witching regulators Positive to negativ e converter PIN CONFIGURATION (1) TO220 -5L (Top View) GENERAL DESCRIPTION The LSP3122 series are monolithic IC that design for a step-down DC/DC converter, and own the ability of driving a 3A lo ad without additional transistor compon ent. Due to reducing the number of exte rnal component, the board space can be saved easily. The external shutdown function can be controlled by.
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