DC/DC Converter. LSP3123 Datasheet

LSP3123 Datasheet PDF, Equivalent


Part Number

LSP3123

Description

150KHZ 3A PWM Buck DC/DC Converter

Manufacture

Lite-On

Total Page 11 Pages
PDF Download
Download LSP3123 Datasheet PDF


LSP3123 Datasheet
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

LSP3123 Datasheet
Liteon Semiconductor Corporation
LSP3123
150KHZ 3A PWM Buck DC/DC Converter
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
+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
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
DC
ICL
IL
IQ
ISTBY
Saturation voltage
Max.Duty Cycle(ON)
Min.Duty Cycle(OFF)
Current limit
Output=0
Output
leakage
Output=-1 current
Quiescent Current
Standby Quiesient
Current
Conditions
VFB=1.3V(Adjustable
version only)
When Current Limit
Occur and
VFB 0.5V, 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
Min.
127
110
10
0
3.6
3.4
Typ.
-10
150
30
5
70
Max.
-50
-100
173
173
50
1.4
1.5
100
6.9
7.5
-50
-30
10
200
250
VIL ON/OFF pin logic input
Low(regultaor ON)
VIH threshold voltage
High(regultaor OFF)
2.0
1.3
0.6
IH
ON/OFF pin logic input
current
VLOGIC=2.5V(OFF)
-15
IL
ON/OFF pin input
current
VLOGIC=0.5V(ON)
-5
θJC Thermal Resistence
TO220-5L
TO263-5L
PDIP8L
Junction
to case
2.5
3.5
12
Thermal Resistence
θJA
with Copper Area of
Approximately 3 in2
TO220-5L
Junction
TO263-5L to ambient
28
23
PDIP8L
35
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Unit
nA
KHz
KHz
V
%
A
µA
mA
mA
µA
V
µA
/W
/W
2/11 Rev1.2


Features Datasheet pdf Liteon Semiconductor Corporation LSP3123 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 18V±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 22V Output load current: 3A Low power standby mode Built-in switching transis tor on chip TO220-5L TO263-5L and PDIP8 L packages APPLICATIONS Simple High-eff iciency step-down regulator On-card swi tching regulators Positive to negative converter GENERAL DESCRIPTION The LSP3 123 series are monolithic IC that desig n for a step-down DC/DC converter, and own the ability of driving a 3A load wi thout 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.
Keywords LSP3123, datasheet, pdf, Lite-On, 150KHZ, 3A, PWM, Buck, DC/DC, Converter, SP3123, P3123, 3123, LSP312, LSP31, LSP3, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)