Latch-off mode is active when the DELAY pin connects to GND through a capacitor. When a current limit is reached, the output current holds at the setting current, but latches off after a preset DELAY time (t_dl1+ t_dl2). t_dl1 is the default delay time, and t_dl2 is a configurable delay time set by a capacitor. Regardless of whether the current limit is removed or not, the output remains latched off. The output only recovers when IN is toggling.

t_dl2 can be calculated by Equation 2.

Equation 2.

where

• C_DELAY is the capacitor connected on the DELAY pin.
• The I_dl(chg) is the device that charges the current in latch-off mode.
• t_dl2 is the user-setting delay time.
• V_dl(ref) is the internal reference voltage in latch-off mode.

Figure 7-4 Latch-Off-Mode Connection

Figure 7-5 Latch-Off-Mode Example