The DIM pin performs not only the dimming function, but also the enable-and-disable function. When the V_IN voltage is above the UVLO threshold, the TPS92200 device can be enabled by driving the DIM pin higher than the threshold voltage V_{DIM_H} for a period longer than t_{DIM_ON1}. To disable the device, the DIM pin must be kept lower than the threshold voltage V_{DIM_L} for a period longer than t_{DIM_OFF}. External pulldown is required to set the device as default-disabled, because the DIM pin is designed as a high-impedance input.