Serial or Parallel Control of Gate Outputs

Sleep State for Low Quiescent Current

Independent On-State Source

Short-to-Ground (Shorted-Load)

Detection/Protection

Independent On-State Over-Current

Detection/Protection With Dynamic Fault

Threshold

Independent Off-State Open-Load

Detection

Supply Over-Voltage Lockout Protection

Asynchronous Open-Drain Fault Interrupt

Terminal to Flag Fault Conditions. Output

Can be OR’ed With Multiple Devices

Encoded Fault Status Reporting Through

Serial Output Terminal (2-Bits Per Channel)

Programmable On-State Fault Deglitch

Timers

High Impedance CMOS Compatible Inputs

With Hysteresis

Fault Mode Selection: Outputs Latched Off

or Switched at Low Duty Cycle

Device Can be Cascaded With Serial

Interface

description

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. It is designed for use in low frequency switching applications for

resistive or inductive loads, including solenoids and incandescent bulbs.

Each channel 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 VCC.

The 8-bit serial peripheral interface (SPI) allows the user to command any of the four outputs on or off, to

program one of eight possible open-load, over-current, and short-load fault deglitch timer settings, and to

engage the sleep state. Data is clocked into the SDI pin on the rising edge of SCLK and clocked out of the SDO

pin on the SCLK falling edge. The serial input bits are logic OR’ed with the IN1-IN4 parallel inputs pins. The serial

interface is also used to read normal-load, open-load, over-current, and short-to-ground conditions for each

channel. Over-voltage lockout can be detected when the FLT pin is low and no bits are set in the SDO register.

Multiple TPIC44H01 devices may be cascaded together using the serial interface to further reduce I/O lines from

the host controller.