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The IR 3312(S) is a Fully Protected 4 terminal high side switch. The input signal is referenced to Vcc. When the input voltage Vcc - Vin is higher than the specified Vih threshold, the output power MOSFET is turned-on. When Vcc - Vin is lower than the specified Vil threshold, the output MOSFET is turned-off. A sense current proportional to the current in the power Mosfet is sourced to the Ifb pin. Over-current shutdown occurs when Vifb - Vin > 4.5 V. The current shutdown threshold is adjusted by selecting the proper RIfb. Either over-current and over-temperature latches off the switch. The device is reset by pulling the input pin high. Other integrated protections ( ESD, reverse battery, active clamp ) make the IR3312(S) very rugged and suitable for the automotive environment.
IR3312S Maximum Ratings
Symbol
Parameter
Min.
Max.
Units
Vcc - Vin max
Maximum input voltage
-16
50
V
Vcc-VIfb max
Maximum Ifb voltage
-0.3
50
Vcc - Vout max.
Maximum output voltage
-0.3
33
Ids cont.
Diode max. permanent current (Rth = 60 /W) (1)
-
2.8
A
Ids1 cont
Diode max. permanent current (Rth = 5 /W) (1)
-
25
Ids pulsed
Diode max. pulsed current (1)
-
100
ESD 1
Electrostatic discharge (human body model)C=100pF, R=1500Ω
• Load current feedback • Programmable over current shutdown • Active clamp • E.S.D protection • Input referenced to Vcc • Over temperatue shutdown • Reverse battery protection