WT7502
Rev. 1.01
PIN DESCRIPTION
Pin Name
PGI
GND
TYPE
Description
Power good input signal pin
Ground
I
P
O
I
FPOB
PSONB
V33
Fault protection output pin, open drain output
On/Off switch input
I
3.3V over voltage & under voltage & over current sense input pin
5V over voltage & under voltage & over current sense input pin
Power supply
V5
VCC
PGO
I
I
O
Power good output signal pin, open drain output
BLOCK DIAGRAM
WT7502
VCC
Power On Reset
PWR
PWR
VCCI
38ms
3.5ms
clr
delay
PSONB
debounce
1.2V ~ 1.8V
Bandgap
VREF = 1.2V
VCCI = 3.6V
75ms
clr
delay
Reference
-
UN
V33
+
Internal
Power
-
OV
UN
+
-
V5
+
PWR
OSC
-
OV
UN
+
clr
CLK
73us
-
VCC
+
debounce
-
OV
+
1.2V
R
S
FPOB
clr
Q
55us
debounce
PGO
clr
73us
300ms
delay
PGI
+
UN
-
clr
debounce
1.2V
Weltrend Semiconductor, Inc.
Page 3
WELTREND [ WELTREND SEMICONDUCTOR ]
