The TPS2HCS08-Q1 device offers the following functions to protect the device from different overcurrent events:

• Capacitive load charging in inrush period
• Immediate shutdown overcurrent protection (I_OCP)
• Programmable fuse protection (or I2T protection) in steady state (if enabled)
• Thermal shutdown (T_REL and T_ABS)
• Short-circuit protection (I_{SCP_LPM_MAN} or I_{SCP_LPM_AUTO}) in LPM states

In regards to overcurrent protection, the device has two operation modes, an optional inrush period at channel startup and during steady state operation. The optional inrush period can be configured to allow the device to handle different inrush currents such as bulbs, motor stall currents, or capacitive loads at the initial turn on of a channel. The CAP_CHRG_CHx, INRUSH_DURATION_CHx, and INRUSH_LIMIT_CHx bits in the ILIM_CONFIG_CHx registers control the operation of the device in the inrush period. Steady state operation takes over after the inrush period has completed. During steady state operation, overcurrent protection (I_OCP) is active and I2T protection is active (if enabled).

During the inrush period all voltage sensing (VBB, VOUT, and VDS) and FET temperature sensing can be used if enabled. Current sensing is only available after the inrush period has completed and the device is in steady state operation. All voltage sensing, FET temperature sensing, and current sensing is available in the steady operation.

Figure 8-20 provides an overview of the overcurrent protection in the optional inrush period and steady state operation.

For more details on the different protections available in the inrush period and in steady state, see the following sections. Overcurrent protection in the LPM states is covered in the LPM section.

Figure 8-20 Overcurrent protection modes overview