AF1117

5 / 10

http://www.afsemi.com

AF-1V0

AF1117-2.5V,Vin=12V

2

5

mA

AF1117-2.85V,Vin=12V

2

5

mA

AF1117-3.3V,Vin=12V

2

5

mA

AF1117- .0V,Vin=12V

2

5

mA

IAdj

Adjust pin

current

AF1117-ADJ

Vin=5V,10mA≤Iout≤1A

55

120

uA

PSRR

1117

f=100Hz, Cout=104

-65

dB

f=1KHz, Cout=104

-65

dB

f=10KHz, Cout=104

-60

dB

f=22KHz, Cout=104

-57

dB

Ichang

e

Iadj change

AF1117-ADJ

Vin=5V,10mA≤Iout≤1A

0.2

10

uA

ΔV/ΔT

Temperature

coefficien

±100

ppm

θ

JC

Thermal

resistance

SOT-223

20

℃/W

TO-252

12.5

Note1: All test are conducted under ambient temperature 25°C and within a short period of time 20ms

Note2: Load current smaller than minimum load current of AF1117-ADJ will lead to unstable or oscillation output.



Detailed

Description

AF1117 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

AF1117 has an adjustable version and six fixed versions (1.2V, 1.8V, 2.5V, 2.85V, 3.3V and 5V)

Fixed Output Voltage Version