Typical applications circuit, Pin descriptions, Functional block diagram – Diodes AP1117/AP1117I User Manual
Page 2
AP1117/AP1117I
Document number: DS31009 Rev. 23 - 2
2 of 13
June 2013
© Diodes Incorporated
AP1117/AP1117I
Typical Applications Circuit
( 5V/3.3V fixed output )
( 5V/2.5V ADJ output )
)
R
R
(1
V
V
1
2
REF
o
Ω
Ω
Pin Descriptions
Pin Number
I/O
Pin Name
Function
1 I
Adj
(GND)
A resistor divider from this pin to the V
OUT
pin and ground sets the output voltage (Ground only for
Fixed-Mode).
2 O
V
OUT
The output of the regulator. A minimum of 4.7µF capacitor (0.15
Ω ≤ ESR ≤ 0.5Ω) must be connected
from this pin to ground to insure stability.
3 I V
IN
The input pin of regulator. Typically a large storage capacitor is connected from this pin to ground to
insure that the input voltage does not sag below the minimum dropout voltage during the load
transient response. This pin must always be 1.3V higher than V
OUT
in order for the device to regulate
properly. A minimum of 4.7µF capacitor (0.15
Ω ≤ ESR ≤0.5Ω) must be connected from this pin to
ground to insure stability.
Functional Block Diagram
3
Thermal
Shutdown
1
2
V
OUT
Adj
1.25V
+
+
CURRENT
LIMIT
V
IN
-
+
+
1
GND
(FIXED)
-