SUPPLY SUPERVISOR. WT7502 Datasheet

WT7502 SUPERVISOR. Datasheet pdf. Equivalent


Weltrend Semiconductor WT7502
www.DataSheet.co.kr
偉詮電子股份有限公司
Weltrend Semiconductor, Inc.
`
WT7502
PC POWER SUPPLY SUPERVISOR
Data Sheet
REV. 1.01
Feb. 26, 2008
The information in this document is subject to change without notice.
©Weltrend Semiconductor, Inc. All Rights Reserved.
新竹市科學工業園區工業東九路242
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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WT7502 Datasheet
Recommendation WT7502 Datasheet
Part WT7502
Description PC POWER SUPPLY SUPERVISOR
Feature WT7502; www.DataSheet.co.kr Weltrend Semiconductor, Inc. ` WT7502 PC POWER SUPPLY SUPERVISOR Data Sheet .
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Datasheet
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Weltrend Semiconductor WT7502
www.DataSheet.co.kr
WT7502
Rev. 1.01
GENERAL DESCRIPTION
The WT7502 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 V33, V5 and VCC input voltage level.
When OVD or UVD detect the fault voltage level, the FPOB is latched HIGH and PGO go low. When
PGI detect the fault voltage level, the FPOB would be kept LOW and PGO go low. The latch can be
reset by PSONB go HIGH. There is 3.5 ms delay time for PSONB turn off FPOB.
When PGI and OVD and UVD detect the right voltage level, the power good output (PGO) will be
issue.
FEATURES
The Over / Under Voltage Detector (OVD / UVD) monitors V33, V5 and VCC input voltage.
Both of the power good output (PGO) and fault protection latch (FPOB) are Open Drain Output.
75 ms time delay for UVD.
300 ms time delay for PGO.
38 ms for PSONB input signal De–bounce.
73 us for PGI / UVD internal signal De–glitches.
55 us for OVD internal signal De–glitches.
3.5 ms time delay for PSONB turn-off FPOB.
The UVD would been disabled when PGI < 1.2V.
PIN ASSIGNMENT AND PACKAGE TYPE
WT7502
PGI
GND
FPOB
PSONB
1
2
3
4
8 PGO
7 VCC
6 V5
5 V33
ORDERING INFORMATION
PACKAGE
8–Pin Plastic DIP 8–Pin Plastic SOP
CHIP
WT7502–N084
WT7502–S084
Lead–FreePbWT7502–N084 Pb WT7502–S084 Pb
WT7502-HXXX
The Top-Side Marking would be added a dot(●)in the right side for lead-free package.
Weltrend Semiconductor, Inc.
Page 2
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Weltrend Semiconductor WT7502
www.DataSheet.co.kr
WT7502
Rev. 1.01
PIN DESCRIPTION
Pin Name TYPE
PGI I
GND
P
FPOB
O
PSONB
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
3.3V over voltage & under voltage & over current sense input pin
5V over voltage & under voltage & over current sense input pin
Power supply
Power good output signal pin, open drain output
BLOCK DIAGRAM
WT7502
WT7502A-084 BLOCK DIAGRAM
VCC
VCCI
PSONB
1.2V ~ 1.8V
PWR
38ms
debounce
V33
V5
VCC
-
+
UN
-
+
OV
-
+
UN
-
+
OV
-
+
UN
1.2V
-
+
OV
Power On Reset
3.5ms
clr
delay
clr 75ms
delay
PWR
Bandgap
Reference
Internal
Power
clr
73us
debounce
clr
55us
debounce
PWR
OSC
R
SQ
VREF = 1.2V
VCCI = 3.6V
CLK
FPOB
PGI
+
-
UN
1.2V
clr
73us
debounce
300ms
clr
delay
PGO
Weltrend Semiconductor, Inc.
Page 3
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