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LR1117D 데이터시트(PDF) 5 Page - Leshan Radio Company

부품명 LR1117D
상세설명  1A Bipolar Linear Regulator
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제조업체  LRC [Leshan Radio Company]
홈페이지  http://www.lrc.cn/
Logo LRC - Leshan Radio Company

LR1117D 데이터시트(HTML) 5 Page - Leshan Radio Company

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DETAILED DESCRIPTION
LR1117 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, 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
LR1117 has an adjustable version andsix fixed versions (1.2V, 1.8V, 2.5V, 2.85V, 3.3V, 5V )
Fixed Output Voltage Version
Vin
Vout
Gnd
10uF
10uF
Vin
Vout
LR1117
Application circuit of LR1117 fixed version
Adjustable Output Voltage Version
LR1117 -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
Vin
Vout
ADJ
10uF
10uF
Vin
Vout
R1
R2
Application Circuit of LR1117 ADJ
The output voltage of adjustable version follows the equation: Vout=1.25 (1+R2/R1)+IAdj R2. We can ignore
IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA).
LR1117 -ADJ
1)
Recommend using 10uF tan capacitor or MLCC
capacitor as bypass capacitor (C1) for all application circuit.
2)
Recommend using 10uF tan capacitor MLCC
capacitor to assure circuit stability.
3)
Capacitor ESR range: 3m
~ 22
5/
LESHAN RADIO COMPANY, LTD.


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