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PDF LC1117 Data sheet ( Hoja de datos )

Número de pieza LC1117
Descripción 1A Bipolar Linear Regulator
Fabricantes Leadchip semi 
Logotipo Leadchip semi Logotipo



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DESCRIPTION
LC1117 is a series of low dropout three-
terminal regulators with a dropout of 1.26V at
1A load current.
Other than a fixed version Vout
1.2V,1.8V,2.5V,2.85V,3.3V,5V , LC1117
has an adjustable version, which can provide
an output voltage from 1.25 to 13.8V with
only two external resistors
LC1117 offers thermal shut down and current
limit functions, to assure the stability of chip
and power system. And it uses trimming
technique to guarantee output voltage
accuracy within ±1.5(1.2V version is within
±2).Other output voltage accuracy can be
customized on command, such as ±1or ±2
.
LC1117 is available in SOT-223,TO-252
power package
TYPICAL APPLICATION
LC1117
REV1.0-Revised DEC 2007
1A Bipolar Linear Regulator
FEATURES
Other than a fixed version and an
adjustable version, output value can be
customized on command.
Maximum output current is 1A
Range of operation input voltage: Max
15V
Line regulation: 0.2
Load regulation: 0.4
Environment Temperature: -40~85
APPLICATIONS
Power Management for Computer Mother
Board, Graphic Card
LCD Monitor and LCD TV
DVD Decode Board
ADSL Modem
Post Regulators for Switching Supplies
ELECTRICAL CHARACTERISTICS
Application circuit of LC1117 fixed version
NOTE: Input capacitor (Cin=10uF) and
Output capacitor (Cout=22uF) are
recommended in all application circuit.
Tantalum capacitor is recommended.
Load Regulation VS. TempIout from10mA to1A
1
0.5
0
-0.5
-1
-50
-25
0 25 50 75
Temperature(℃)
100 125 150
www.leadchip.com.cn
Copyright@2007, Leadchip semi
1
Your final power solution
Free Datasheet http://www.datasheet4u.com/

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LC1117 pdf
LC1117
LC1117-2.5V, Vin-Vout=1.25V
4 8 mA
LC1117-2.85V, Vin-Vout=1.25V
4 8 mA
LC1117-3.3V, Vin-Vout=1.25V
4 8 mA
LC1117-5V, Vin-Vout=1.25V
Adjust Pin
IAdj
Current
(Adjustable
Version)
Ichange
Adjust Pin
Current Change
4 8 mA
55 120 uA
0.2 uA
Temperature
Stability
0.5 %
θJC
Thermal
Resistor
SOT-223
TO-252
20 /
10 W
Note1:The Parameters of Line Regulation and Load Regulation in Table1 are tested under
constant junction temperature. The Curve of Load Regulation vs. Temperature is shown in typical
parameter curve that follows.
Note2:When Iout varies between 0~1A,Vin-Vout varies between 1.5V~12V under constant junction
temperaturethe parameter is satisfied the criterion in table. If temperature varies between -50
TA140℃,it needs output current to be larger than 10mA to satisfy the criterion.
Note3:Dropout Voltage is specified over the full output current range of the device, and it is tested
under following testing conditions: First step is to find out the Vout value(Vout1) when
Vin1=Vout+1.5V, second step is to decrease Vin(Vin2) until Vout value is equal to
98.5%*Vout1(Vout2). Vdropout=Vin2-Vout2.
Note4:Minimum Load Current is defined as the minimum output current required to maintain
regulation. When 1.5VVin-Vout12Vthe device is guaranteed to regulate if the output current
is greater than 10mA.
www.leadchip.com.cn
Copyright@2007, Leadchip semi
5
Your final power solution
Free Datasheet http://www.datasheet4u.com/

5 Page










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