APW1681
3-Channel Power Supply Supervisor
Features
Over Voltage Protection and Lock Out for
!
3.3 V, 5 V, and 12 V
Under Voltage Protection and Lock Out for
!
3.3 V and 5 V
Fault Protection Output with Open Drain
!
Output Stage
Open Drain Power Good Output Signal for
!
Power Good Input, 3.3 V and 5 V
General Description
The APW1681 is designed to minimize the exter-
nal components of personal-computer switching
power supply systems. It provides protection
circuits, power good indicator, fault protection out-
put
FPO
and
PSON
control.
OVP (over voltage protection) monitors 3.3V, 5 V,
and 12 V (12 V OV detects via V
CC
terminal). UVP
(under voltage protection) monitors 3.3V and 5V.
When an OV or UV condition is detected, the PGO
(power good output) is set to low and
FPO
is latched
to high.
PSON
from low to high resets the protec-
tion latch. There is a 2.36ms turn-off delay
from
PSON
to
FPO
. There is no delay during turn
on.
Power good feature monitors PGI, 3.3V and 5V un-
der voltages, and issues a power good signal when
they are ready.
•
•
•
•
•
•
•
300 ms Power Good Delay
2.36 ms
PSON
Control to
FPO
Turn-Off
Delay
38 ms
PSON
Control Debounce
•
75 ms Delay for 3.3V and 5V Under Voltage
!
Protection
•
•
•
73
µs
Width Noise Deglitches
Wide Power Supply Voltage Range
from 4 V to 15 V
Intelligent Under Voltage Protection to Pre
vent Instantaneously AC Power Black Out
Pin Description
Applications
•
PC Switching Power Supply
PGI
GND
FPO
PSON
1
2
3
4
8
7
6
5
PGO
VCC
VS5
VS33
Ordering Information
APW1681
Handling Code
Temp. Range
Package Code
Package Code
J : DIP - 8
Temp. Range
C : 0 to 70
°
C
Handling Code
TU : Tube
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Feb., 2001
1
www.anpec.com.tw
APW1681
Block Diagram
V
CC
V
REF
12 OV
-
+
R
L
=100kΩ
V
S5
R
POR
Reset
Vreg
V
DD
=3.5V
Bandgap
Reference
V
REF
1.192V
R
5 OV
73µs
Debounce
73µs
Debounce
RTT
R
S Q
FPO
V
REF
-
+
R
L
=100kΩ
V
S33
R
2.36 ms
Delay
EN
Reset
Dominent
Latch
Reset
38ms
Debounce
V
DD
150µA
PSON
V
REF
3.3 OV
-
+
75ms
Delay
EN
Counter
R
R
L
=100kΩ
3.3 UV
V
REF
-
+
V
REF
5 UV
-
+
R
PGO
EN
300ms
Delay
Counter
GND
73µs
Debounce
V
REF
PGI
-
+
Absolute Maximum Ratings
Symbol
V
CC
VS5, VS33
FPO
PSON
PGI
PGO
T
A
T
STG
T
L
Parameter
Supply Voltage
5V and 3.3V Input Voltage(Note 1)
Fault Protection Output Voltage
ON/O FF Control Input Voltage(Note 1)
Power G ood Input Voltage(Note 1)
Power G ood O utput Voltage(Note 1)
Am bient Tem perature Range
Storage Tem perature R ange
Lead Temperature (Soldering, 10 second)
Rating
16
8
16
8
8
8
0 to 70
-65 to +150
260
Unit
V
V
V
V
V
V
°C
°C
°
C
Note 1: For a short period (<1 sec) over voltage test, these pins can withstand up to 12V.
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Feb., 2001
2
www.anpec.com.tw
APW1681
Pin Function Description
Terminal
Name
V
S33
V
S5
GND
FPO
PGI
PGO
PSON
V
CC
5
6
2
3
1
8
4
7
O
I
O
I
I
I
I
3.3 V over/under voltage protection input pin
5 V over/under voltage protection input pin
Ground
Inverted fault protection output, open drain output stage
Power good input signal pin
Power good output signal pin, open drain output stage
ON/OFF control input pin
Supply voltage/12 V over voltage protection input pin
NO.
I/O
Terminal Function Description
Thermal Characteristics
Symbol
R
THJA
Parameter
Thermal Resistance from Junction to Ambient in Free Air
DIP-8
Value
129
Unit
K/W
Electrical Characteristics
Symbol
Parameter
V
CC
=5V, T
A
=25°C ( unless otherwise noted)
Test Conditions
APW1681
Min.
Typ.
3.9
6.1
13.8
Max.
4.1
6.5
14.3
5
0.3
0.7
15
1.14
1.19
2.7
4.3
75
1.24
2.83
4.5
114
ms
V
V
V
µA
V
V
Unit
Over Voltage Protection
Over Voltage Threshold
V
S33
V
S5
V
CC
I
LKG
V
OL
V
OH
Leakage Current ( FPO )
Low Level Output Voltage ( FPO )
FPO Pin Pull High Voltage
Input Threshold Voltage (PGI)
Under Voltage threshold
V
S33
V
S5
Under Voltage Protection Delay Time
(3.3V and 5V)
V( FPO )=5V
I
SINK
= 10mA
I
SINK
= 30mA
PGI and PGO
2.55
4.1
49
3.7
5.7
13.3
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Feb., 2001
3
www.anpec.com.tw
APW1681
Electrical Characteristics (Cont.)
Sym bol
I
LK G
V
OL
V
OH
PSON
P a r a m e te r
L e a k a g e C u rre n t (P G O )
L o w L e v e l O u tp u t V o lta g e (P G O )
P G O P in P u ll H ig h V o lta g e
C o n tr o l
In p u t P u ll-U p C u rre n t
H ig h - L e v e l In p u t V o lta g e
L o w -L e v e l In p u t V o lta g e
To ta l D e v ic e
V
CC
I
C C
t
d1
t
b
T
dg
t
d2
S u p p ly V o lta g e
S u p p ly C u rre n t
D e la y tim e (P G I to P G O )
D e b o u n c e T im e ( PSON )
N o is e D e g litc h T im e
D e la y T im e ( PSON to FPO )
PSON = 5 V
200
24
47
300
38
73
4
15
1
450
57
11 0
t
b
+ 4
V
mA
ms
ms
µ
s
ms
PSON = 0 V
2 .4
1 .2
150
µ
A
V
V
Te s t C o n d itio n s
M in .
PG O =5V
S in k C u rre n t = 1 0 m A
APW 1680
Ty p .
M ax.
5
0 .4
7
U n it
µ
A
V
V
S w itc h in g C h a r a c te r is tic s
t
b
+ 1 .1 t
b
+
2 .3 6
Typical Application Circuit
5 V
SB
PGI
PGO
APW1681
12 V
1
PGI
PGO
8
0.5V
Drop
5 V
SB
2
GND
VCC
7
3
FPO
VS5
6
5V
PSON
4 PSON
VS33
5
3.3 V
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Feb., 2001
4
www.anpec.com.tw
APW1681
Timing Chart
VDD
Reset
R
PSON
S
Q
FPO
PGI
3.3V
5V
12V
PGO
t
d1
t
d1
Protection Occur
t
b
t
b
t
d2
t
d1
PG Off Delay
AC
OFF
PSON
OFF
PSON
ON
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Feb., 2001
5
www.anpec.com.tw
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