7.4.1 Enable and Disable

The device is enabled by setting the EN pin to a logic High (typical 0.8 V). Accordingly, shutdown mode is forced if the EN pin is pulled Low (typical 0.7 V) with a shutdown current of typically 0.7 μA. An internal resistor of 260 Ω discharges the output via the VOUT pin smoothly when the device is disabled. The output discharge function also works when thermal shutdown, undervoltage lockout or short circuit protection are triggered. The output discharge function stops working when the input voltage has decreased to around 0.5V.

An internal pull-down resistor of 400 kΩ is connected to the EN pin when the EN pin is Low. The pull-down resistor is disconnected when the EN pin is High.