LR1117D Ver la hoja de datos (PDF) - Leshan Radio Company,Ltd
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LR1117D Datasheet PDF : 9 Pages
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LESHAN RADIO COMPANY, LTD.
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
LR1117
Vin
Vin Vout
10uF
Gnd
Vout
10uF
Application circuit of LR1117 fixed version
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: 3mȍ ~ 22ȍ
Adjustable Output Voltage Version
LR1117-ADJ provides a1.25V reference voltage. Any output voltage between 1.25V~12V can be achievable
by choosing two external resistors (schematic is shown below), R1 and R2
LR1117-ADJ
Vin
Vout
Vin
Vout
10uF
ADJ
R1
10uF
R2
Application Circuit of LR1117ͲADJ
The output voltage of adjustable version follows the equation: Vout=1.25u(1+R2/R1)+IAdjuR2. We can ignore
IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA).
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