LR1117C Ver la hoja de datos (PDF) - Leshan Radio Company,Ltd

Número de pieza

componentes Descripción

Fabricante

LR1117C

1A Bipolar Linear Regulator

Leshan Radio Company,Ltd 

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

Vout

Vin

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)+IAdjR2. 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

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