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PDF LR1117C Data sheet ( Hoja de datos )
| Número de pieza | LR1117C | |
| Descripción | 1A Bipolar Linear Regulator | |
| Fabricantes | LRC | |
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1A Bipolar Linear Regulator
LESHAN RADIO COMPANY, LTD.
LR1117C
DESCRIPTION
LR1117C is a series of low dropout thre-e terminal
regulators with a dropout of 1.3V at 1A load current.
LR1117C features a very low standby current 2mA
compared to 5mA of competitor.
Other than a fixed version, Vout = 1.2V, 1.5V, 1.8V,
2.5V, 3.3V, 5V, and 12V, LR1117C has an adjustable
version, which can provide an output voltage from
1.25 to 12V with only two external resistors.
LR1117C 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 2%.
Other output voltage accuracy can be customized
on demand, such as 1%
LR1117C is available in SOT-223,TO-252 power
package.
FEATURES
Other than a fixed version and an adjustable
version, output value can be customized on
demand.
Maximum output current is 1A
Range of operation input voltage: Max 12V
Standby current: 2mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
Environment Temperature: -40C~85C
APPLICATIONS
Power Management for Computer Mother
Board, Graphic Card
BLD Monitor and BLD TV
DVD Decode Board
ADSL Modem
Post Regulators for Switching Supplies
TYPICAL APPLICATION
LR1117C
Vin
Vin Vout
10uF Gnd
Vout
10uF
Application circuit of LR1117C fixed version
NOTE: Input capacitor (Cin=10uF) and Output
capacitor (Cout=10uF) are recommended in all
application circuit. Tantalum capacitor is
recommended.
TYPICAL ELECTRICAL CHARACTERISTIC
LR1117C
Feb 2011 Ver1.2
1/10
1 page  
LESHAN RADIO COMPANY, LTD.
DETAILED DESCRIPTION
LR1117C is a series of low dropout voltage, three terminal regulators. Its application circuit is very simple:
the fixed version only needs two capacitors and the adjustable version only needs two resistors and two capacitors to
work. It is composed of some modules including start-up circuit, bias circuit, bandgap, thermal shutdown, current limit,
power transistors and its driver circuit and so on.
The thermal shut down modules can assure chip and its application system working safety when the junction
temperature is larger than 140°C.
The bandgap module provides stable reference voltage, whose temperature coefficient is compensated by careful design
considerations. The temperature coefficient is under 100 ppm/°C. And the accuracy of output voltage is guaranteed by
trimming technique.
TYPICAL APPLICATION
LR1117C has an adjustable version andsix fixed versions (1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V and 12V)
Fixed Output Voltage Version
LR1117C
Vin Vin Vout
10uF Gnd
Vout
10uF
Application circuit of LR1117C fixed version
1) Recommend using 10uF tan capacitor as bypass capacitor (C1) for all application circuit.
2) Recommend using 10uF tan capacitor to assure circuit stability.
Adjustable Output Voltage Version
LR1117C-ADJ provides a 1.25V reference voltage. Any output voltage between 1.25V~12V can be achievable
by choosing two external resistors (schematic is shown below), R1 and R2
LR1117C-ADJ
Vin
Vin Vout
Vout
10uF ADJ R1 10uF
R2
Application Circuit of LR1117C-ADJ
The output voltage of adjustable version follows the equation: Vout=1.25(1+R2/R1)+IAdjR2. We can ignore
IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA).
Feb 2011 Ver1.2
5/10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LR1117C.PDF ] | |
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