HIP1031

HIP1031 December 1997 Half Amp High Side Driver with Overload Protection Description The HIP1031 is a High Side Driver Power Integrated Circuit designed to switch power supply voltage to an output load. It is the equivalent of a PNP pass transistor operated as a protected high side current switch in the saturated ON state with low forward voltage drop at the maximum rated current. It has low output leakage and low idle current in the OFF state. The Functional Block Diagram for the HIP1031 shows the protection control circuit functions of over-current, overvoltage and over-temperature. A small metal resistor senses overcurrent in the power supply path of the pass transistor and load. Overvoltage detection and shutdown of the output driver occurs when a comparator determines that the supply voltage has exceeded a comparator reference level. Overtemperature is sensed from a VBE differential sense element that is thermally close to the output drive transistor. In addition to the input detected overvoltage protection, negative peak voltage of an inductive load is clamped with an internal zener diode. An internal bandgap supply voltage source provides a stable voltage reference over the chip operating temperature range, providing bias and reference control for the protection circuits. The HIP1031 is particularly well suited for driving lamps, relays, and solenoids in automotive and industrial control applications where voltage and current overload protection at high temperatures i...