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The RLPIN08LE is a monolithic power device which incorporates a logic level PowerMOS transistor with a resistor in series with the source. The base and emitter of a lateral bipolar transistor is connected across this resistor, and the collector of the bipolar transistor is connected to the gate of the PowerMOS transistor. When the voltage across the resistor reaches the value required to forward bias the emitter base junction of the bipolar transistor, the bipolar transistor "turns on". A series resistor is incorporated in series with the gate of the PowerMOS transistor allowing the bipolar transistor to drive the gate of the PowerMOS transistors to a voltage which just maintains a constant current in the PowerMOS transistor. Since both the resistance of the resistor in series with the PowerMOS transistor source and voltage required to forward bias the base emitter junction of the bipolar transistor vary with the temperature, the current at which the device limits is a function of temperature. This dependence is shown in figure 3.
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