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MC3425 Datasheet PDF : 9 Pages
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MC3425
Power Supply Supervisory/
Over and Undervoltage
Protection Circuit
The MC3425 is a power supply supervisory circuit containing all
the necessary functions required to monitor over and undervoltage
fault conditions. These integrated circuits contain dedicated over and
undervoltage sensing channels with independently programmable
time delays. The overvoltage channel has a high current Drive Output
for use in conjunction with an external SCR Crowbar for shutdown.
The undervoltage channel input comparator has hysteresis which is
externally programmable, and an open−collector output for fault
indication.
• Dedicated Over and Undervoltage Sensing
• Programmable Hysteresis of Undervoltage Comparator
• Internal 2.5 V Reference
• 300 mA Overvoltage Drive Output
• 30 mA Undervoltage Indicator Output
• Programmable Time Delays
• 4.5 V to 40 V Operation
MAXIMUM RATINGS
Rating
Power Supply Voltage
Comparator Input Voltage Range (Note 1)
Drive Output Short Circuit Current
Symbol
VCC
VIR
IOS(DRV)
Value
40
−0.3 to +40
Internally
Limited
Unit
Vdc
Vdc
mA
Indicator Output Voltage
Indicator Output Sink Current
Power Dissipation and Thermal
Characteristics
Maximum Power Dissipation @ TA = 70°C
Thermal Resistance, Junction−to−Air
VIND
IIND
PD
RθJA
0 to 40
Vdc
30
mA
1000
80
mW
°C/W
Operating Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
TJ
+150
°C
TA
0 to +70
°C
Tstg −55 to +150 °C
NOTE: 1. The input signal voltage should not be allowed to go negative by more than 300 mV
NOTE: 1. or positive by more than 40 V, independent of VCC, without device destruction.
Simplified Application
Overvoltage Crowbar Protection, Undervoltage Indication
Vin
Vout
http://onsemi.com
POWER SUPPLY SUPERVISORY/
OVER AND UNDERVOLTAGE
PROTECTION CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
8
1
P1 SUFFIX
PLASTIC PACKAGE
CASE 626
PIN CONNECTIONS
O.V. DRV
Output
1
O.V. DLY 2
O.V. Sense 3
U.V. Sense 4
8 VCC
7 Gn
d
U.V. IND
6 Output
5 U.V. DLY
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC3425P1 TA = 0° to +70°C
Plastic DIP
DC
Power
Supply
+
Cout
MC3425
Undervoltage
Indication
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 4
Publication Order Number:
MC3425/D
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