TPIC44H01

The TPIC44H01 is a four channel high-side pre-FET driver which provides serial or parallel input interface to control four external NMOS power FETs. TPIC44H01 is designed for use in low frequency switching applications for resistive or inductive loads, including solenoids and incandescent bulbs.

Each channel of TPIC44H01 has over-current, short-to-ground, and open-load detection that is flagged through the FLT pin and distinguished through the serial interface. Over-current thresholds are set through the V_{(PK_x)} and V_(COMP1-4) pins. Short-to-ground and open-load thresholds are set internally to approximately 2.5 V. The AR_ENBL pin is used to define the operation of the device during a fault condition, allowing the outputs to either latch off or to enter a low duty cycle, auto-retry mode. An over-voltage lockout circuit on V_(PWR) protects the device and the external FETs. A low current sleep state mode is provided to allow the TPIC44H01 to be used in applications where V_(PWR) is connected directly to the battery. An internal charge pump allows the use of N-channel FETs for high-side drive applications, while current-limit gate drive provides slope control for reduced RFI.

By having the unique ability to develop a dynamic over-current threshold, the TPIC44H01 can be used to drive incandescent bulbs with long inrush currents without falsely flagging a fault. Likewise, the user can select an internally set over-current threshold of ~1.25 V by pulling the respective V_(COMP1-4) pin to V_CC.