AP1117
1A LOW DROPOUT POSITIVE ADJUSTABLE OR
FIXED-MODE REGULATOR
ʳ
ʳ
AP1117 Rev. 3 3 of 11 SEPTEMBER 2006
www.diodes.com © Diodes Incorporated
Block Diagramʳ
NAME I/O PIN # FUNCTION
Adj (GND) I 1
A resistor divider from this pin to the V
out
pin and ground sets the output voltage
(Ground only for Fixed-Mode).
V
out
O 2
The output of the regulator. A minimum of 10uF capacitor (0.15ȍ ESR 20ȍ)
must be connected from this pin to ground to insure stability.
V
in
I 3
The input pin of regulator. Typically a large storage capacitor (0.15ȍ ESR 20ȍ)
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.
Pin Descriptionsʳ
3
Thermal
Shutdown
1
2
V
out
Adj
1.25V
+
+
CURRENT
LIMIT
V
in
-
+
+
1
GND
(FIXED)
-
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