SLVSE26B November 2017 – April 2018 TPSM84824
The EN pin provides electrical ON/OFF control of the device. Once the EN pin voltage exceeds the threshold voltage, the device starts operation. If the EN pin voltage is pulled below the threshold voltage, the regulator stops switching and enters low operating current state. The EN pin has an internal pullup current source allowing the user to float the EN pin for enabling the device.
If an application requires controlling the EN pin, either drive it directly with a logic input or use an open drain/collector device to interface with the pin. Applying a low voltage to the enable control (EN) pin disables the output of the supply, shown in Figure 13. When the EN pin voltage exceeds the threshold voltage, the supply executes a soft-start power-up sequence, as shown in Figure 14.