ADT7221
Pin Description
Pin No.
Name
I/O
-
Type
P
Description
VIN
GND
PWM
FB
1
2
3
4
5
6
Power supply input
Ground
-
G
O
I
D
Switching output
Feedback voltage input
LDO output
A
OUT
DRV
O
I/O
A
A
LDO pass transistor drive signal
I : Input pin
P : Power pin
O : Output pin IO : Input/Output pin
G : Ground pin
A : Analog pin D : Digital pin
Functional Block Diagram
Internal
VIN
REG.
OSC
(500kHz)
BIAS
GND
REF
+
-
PWM
+
-
FB
ZIN
PWM
Pre-
ERROR AMP
Modulator
DRIVER
ZFB
LDO
DRV
OUT
* This specifications are subject to be changed without notice
http://www.ad-tech.co.kr
Jun. 16. 2008 / Rev. 0.1
3/6
ADTECH [ ADTECH ]
