Ap7331, Typical application circuit, Pin descriptions – Diodes AP7331 User Manual
Page 2: Functional block diagram

AP7331
300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT
LOW DROPOUT LINEAR REGULATOR
AP7331
Document number: DS31914 Rev. 3 - 2
2 of 13
January 2011
© Diodes Incorporated
Typical Application Circuit
1uF
IN
GND
EN
OUT
Enable
1uF
V
IN
V
OUT
AP7331
Fixed Output
1uF
IN
GND
EN
OUT
Enable
ADJ
R2
R1
1uF
V
IN
V
OUT
AP7331
Adjustable Output
Pin Descriptions
Pin Name
Pin Number
Description
SOT25
(fixed)
DFN2020-6
(fixed)
SOT25
(adj)
DFN2020-6
(adj)
IN
1 3 1 3
Voltage input pin. Bypass to ground through at least
1µF capacitor
GND
2 2 2 2
Ground
EN
3
1
3
1
Enable input, active high
ADJ
-
-
4
6
Output feedback pin
NC
4
5, 6
-
5
No connection
OUT
5 4 5 4
Voltage output pin. Bypass to ground through 1µF
ceramic capacitor
Functional Block Diagram
IN
EN
GND
OUT
Gate
Driver
0.4V
Current Limit
and Thermal
Shutdown
Fixed Version
R
R
IN
EN
GND
ADJ
OUT
Gate
Driver
0.4V
Current Limit
and Thermal
Shutdown
Adjustable Version
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
=
2
R
1
R
1
REF
V
OUT
V
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