The TPIC71004-Q1 is a quad channel squib driver for airbags deployment in automotive applications. Each channel consists of a high side and a low side switch with independent control logic for protection against inadvertent deployment. Both the high and the low side switches have internal current limits, over-temperature protection.

The IC registers are used for four channel configuration, control and status monitoring. To prevent inadvertent deployment, the high and the low side switches will be turned on only if the proper configuration sequence is used and multiple inputs to the deploy controller logic are at the correct level. The registers are programmed using a serial communications interface.

The maximum on time for each channel is limited by programmable Firing Time Out Timer to prevent excessive power dissipation. In addition, a current limit register is used to program the maximum current through the switches during a deployment. The current limitation on the low side switch is larger than the corresponding high side switch. During deployment, the low side switch will be full enhanced and operate with RDS_ON mode and the high side switch will be in current regulation mode.Read more