When a thermal shutdown or an immediate shutdown overcurrent protection fault occurs, the channel with the fault will either auto-retry or latch off based on the LATCH_CHx bit setting in the CHx_CONFIG registers. Depending on the CAP_CHRG_CHx settings and the I_OCP level, the auto retry response will behave differently.

Auto Retry Behavior - No Capacitive Charging Mode (CAP_CHRG_CHx = 00)

If CAP_CHRG_CHx = 00 and LATCH_CHx = 0 and a short circuit event occurs, after the channel turns off and t_RETRY expires the device will retry in the inrush period with the I_OCP level set through the INRUSH_LIMIT_CHx [3:0] bits. The INRUSH_DURATION_CHx [2:0] still sets the duration of the inrush period. If the I_OCP level is greater than the I_{OCP_RETRY_FLBK} and the number of retries is greater than n_RETRY then the device will foldback to the I_{OCP_RETRY_FLBK} level and will continue to retry at this level until the short is removed or the channel is toggled. Figure 8-24 and Figure 8-25 showcases these hot short cases that occur in steady state operation with I_OCP below I_{OCP_RETRY_FLBK} and I_OCP above I_{OCP_RETRY_FLBK}, respectively. Starting into a short in the inrush period results in the same retry behavior as a hot short in steady state except the first initial overcurrent shutdown level will be determined by the INRUSH_LIMIT_CHx [3:0].

Figure 8-24 Hot Short during Steady State Operation with CAP_CHRG_CHx = 00, Auto-retry (LATCH_CHx = 0), and I_OCP < I_{OCP_RETRY_FLBK}

Figure 8-25 Hot Short during Steady State Operation with CAP_CHRG_CHx = 00, Auto-retry (LATCH_CHx = 0), and I_OCP > I_{OCP_RETRY_FLBK}

Latch-off Behavior - No Capacitive Charging Mode (CAP_CHRG_CHx = 00)

If LATCH_CHx = 1 and CAP_CHRG_CHx = 00 and the I_OCP level is exceeded, the device will latch-off and will not retry until the CHx_ON bit (version A) is toggled or the DIx pin (version B) is toggled or the LATCH_CHx bit is toggled. Upon resetting the latch either through an output toggle or through the LATCH_CHx bit toggle, the channel will start up into the inrush period if configured. Figure 8-26 below shows the latch behavior if a hot short circuit occurs during steady state operation with LATCH_CHx = 1. Figure 8-27 shows the latch behavior if the channel starts into a short circuit event in the inrush period.

Figure 8-26 Hot Short during Steady State Operation with CAP_CHRG_CHx = 00, Latch-off (LATCH_CHx = 1)

Figure 8-27 Start into a Short Circuit Event with CAP_CHRG_CHx = 00, Latch-off (LATCH_CHx = 1)

Auto Retry Behavior - Current Limit Regulation Charging Mode (CAP_CHRG_CHx = 10)

If a short circuit event occurs in steady state operation with CAP_CHRG_CHx = 10 and LATCH_CHx = 0, after the channel turns off and t_RETRY expires the device will retry into the inrush period with the current limit regulation (I_{CL_REG}) set through the INRUSH_LIMIT_CHx [3:0] bits. Figure 8-28 shows a hot short event that occurs in steady state operation with CAP_CHRG_CHx = 10 and LATCH_CHx = 0. Figure 8-29 shows the auto-retry behavior if the channel starts into a short circuit event in the inrush period.

Figure 8-28 Hot Short during Steady State Operation with CAP_CHRG_CHx = 10 and Auto-retry (LATCH_CHx = 0)

Figure 8-29 Start into a Short Circuit Event with CAP_CHRG_CHx = 10 and Auto-rety (LATCH_CHx = 0)

Latch-off Behavior - Current Limit Regulation Capactive Charging Mode (CAP_CHRG_CHx = 10)

If LATCH_CHx = 1 and CAP_CHRG_CHx = 10 and the I_OCP level is exceeded, the device will latch-off and will not retry until the CHx_ON bit (version A) is toggled or the DIx pin (version B) is toggled or the LATCH_CHx bit is toggled. Upon resetting the latch either through an output toggle or through the LATCH_CHx bit toggle, the channel will start up into the inrush period if configured. Figure 8-30 below shows the latch behavior if a hot short circuit occurs during steady state operation with LATCH_CHx = 1. Figure 8-31 shows the latch behavior if the channel starts into a short circuit event in the inrush period.

Figure 8-30 Hot Short during Steady State Operation with CAP_CHRG_CHx = 10, Latch-off (LATCH_CHx = 1)

Figure 8-31 Start into a Short Circuit Event with CAP_CHRG_CHx = 10, Latch-off (LATCH_CHx = 1)