WT7515 Datasheet PDF - Weltrend

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WT7515
Weltrend

Part Number WT7515
Description PC POWER SUPPLY SUPERVISOR
Page 11 Pages


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Weltrend Semiconductor, Inc.
`
WT7515
PC POWER SUPPLY SUPERVISOR
Data Sheet
REV. 1.50
May 07, 2004
The information in this document is subject to change without notice.
©Weltrend Semiconductor, Inc. All Rights Reserved.
24 2
2F, No. 24, Industry E. 9th RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419
Email:support@weltrend.com.tw



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WT7515
Rev. 1.50
GENERAL DESCRIPTION
The WT7515 provides protection circuits, power good output (PGO), fault protection latch (FPOB),
and a protection detector function (PSONB) control. It can minimize external components of switching
power supply systems in personal computer.
The Over / Under Voltage Detector (OVD / UVD) monitors 3.3V, 5V, 12V input voltage level. The
Over Current Detector (OCD) monitor IS33, IS5, IS12 input current sense. When OVD or UVD or OCD
detect the fault voltage level, the FPOB is latched HIGH and PGO go low. The latch can be reset by
PSONB go HIGH. There is 2.4 ms delay time for PSONB turn off FPOB.
When OVD and UVD and OCD detect the right voltage level, the power good output (PGO) will be
issue.
FEATURES
The Over / Under Voltage Detector (OVD / UVD) monitors 3.3V, 5V, 12V input voltage level.
The Over Current Detector (OCD) monitors IS33, IS5, IS12 input current sense.
Both of the power good output (PGO) and fault protection latch (FPOB) are Open Drain Output.
75 / 300 ms time delay for UVD.
300 ms time delay for PGO.
38 ms for PSONB input signal De–bounce.
73 us for internal signal De–glitches.
2.4 ms time delay for PSONB turn-off FPOB.
PIN ASSIGNMENT AND PACKAGE TYPE
Pin assignment
WT7515–140WT
PGI
GND
FPOB
PSONB
IS12
RI
NC
1 14
2 13
3 12
4 11
5 10
69
78
PGO
VCC
V5
V33
V12
IS33
IS5
WT7515–141WT
PGI
GND
FPOB
PSONB
IS12
RI
IS5
1 14
2 13
3 12
4 11
5 10
69
78
PGO
VCC
V5
V33
VCC2
V12
IS33
ORDERING INFORMATION
PACKAGE
14–Pin Plastic DIP
14–Pin Plastic SOP
WT7515–N140WT
WT7515–S140WT
WT7515–N141WT
WT7515–S141WT
Lead–Free Pb
WT7515–N140WT Pb WT7515–S140WT Pb
WT7515–N141WT Pb WT7515–S141WT Pb
The Top-Side Marking would been added a dot
in the right side for lead-free package.
Weltrend Semiconductor, Inc.
Page 2



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WT7515
Rev. 1.50
PIN DESCRIPTION
Pin Name TYPE
PGI I
GND
P
FPOB
O
PSONB
I
IS12
I
RI I
VCC2
I
IS5 I
IS33
I
V12 I
V33 I
V5 I
VCC
I
PGO
O
Description
Power good input signal pin
Ground
Fault protection output pin, open drain output
On/Off switch input
12V over current protection sense input
Current sense adjust input
Current sense power supply
5V over current protection sense input
3.3V over current protection sense input
12V over/under voltage input pin
3.3V over/under voltage input pin
5V over/under voltage input pin
Power supply
Power good output signal pin, open drain output
BLOCK DIAGRAM
VCC
VCCI
PSONB
V33
V5
V12
PGI
IS33
IS5
IS12
PWR
38ms
debounce
-
+
UN
-
+
OV
-
+
UN
-
+
OV
-
+
UN
VREF
-
+
OV
-
+
UN
VCC2
-
+
OI
IREF * 8
VCC2
-
+
OI
IREF * 8
VCC2
-
+
OI
IREF * 8
Power On Reset
RST
2.4ms
clr
delay
75ms
clr
delay
PWR
RST
73us
debounce
Bandgap
Reference
VREF = 1.2V
Internal
Power
PWR
VCCI = 3.6V
OSC
CLK
R
SQ
FPOB
RST
73us
debounce
300ms
clr
delay
PGO
V12
VREF
V12
+
-
IREF
RI
Weltrend Semiconductor, Inc.
Page 3



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WT7515
Rev. 1.50
ABSOLUTE MAXIMUM RAT INGS
Parameter
Min.
Max.
Supply voltage, VCC, VCC2, V12
Input voltage
PSONB, V5, V33, PGI,
I12, I5, I33
Output voltage
FPOB, PGO
Operating temperature
–0.3
–0.3
–0.3
–0.3
-40
16
7
V12+0.3
7
125
Storage temperature
-55 150
*Note: Stresses above those listed may cause permanent damage to the devices
Unit
V
V
V
V
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply voltage, VCC
Supply voltage, VCC2
Input voltage
PSONB, V5, V33, PGI
V12
Output voltage
FPOB, PGO
Output sink current
FPOB
PGO
Supply voltage rising time
Output current for RI
RI
Conditions
Min.
4
9.5
1
10
Typ.
12
12
Max.
15
15
7
15
7
30
10
65
Unit
V
V
V
V
mA
mA
ms
uA
ELECTRICAL CHARACTERISTICS, at Ta=25°C and VCC=5V.
Over Voltage Detection
Parameter
Over voltage threshold
V33
V5
V12
ILEAKAGE Leakage current (FPOB)
VOL Low level output voltage (FPOB)
Condition
V(FPOB) = 5V
Isink =10mA
Isink =30mA
Min.
3.7
5.7
13.3
Typ.
3.9
6.1
13.8
5
0.3
0.7
PGI and PGO
Parameter
Under voltage threshold
V33
V5
V12
Input threshold voltage(PGI)
ILEAKAGE Leakage current(PGO)
VOL Low level output voltage(PGO)
Input offset voltage of OCP comparators
Condition
PGO = 5V
Isink =10mA
Min.
2.55
4.1
9.5
1.16
-5
Typ.
2.69
4.3
10
1.20
5
0.4
Max.
4.1
6.5
14.3
Unit
V
V
V
uA
V
Max.
2.83
4.47
10.5
1.24
5
Unit
V
V
V
V
uA
V
mV
PSONB
Parameter
Input pull-up current
High-level input voltage
Low-level input voltage
Condition
PSONB= 0V
Min.
2.0
Typ.
150
Max.
0.8
Unit
uA
V
V
Weltrend Semiconductor, Inc.
Page 4



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