JAJSN49 January 2022 TPSM5D1806E
PRODUCTION DATA
The precision enable feature of the TPSM6D1806E allows the voltage on the EN pin (VEN) to control the ON/OFF functionality of the device. The EN pin has an internal pullup. Floating the EN pin allows the device to start up when a valid input voltage is applied. The TPSM5D1806 switching action and output regulation are enabled when VEN is greater than 1.2 V (typical). While the device is switching, if the EN voltage falls below 1.1 V (typical), the device stops switching.
It is recommended to control the turn-on and turn-off of the device at a voltage greater than the minimum input voltage as shown in Table 7-2. An external UVLO control can be added using a resistor divider on the EN1 (EN2) pin, between VIN and AGND (see Figure 7-7). Select a top enable resistor of 100 kΩ and calculate the value for the bottom enable resistor (RENB) using Equation 2. It is recommended to use divider resistors with 1% tolerance or better and with temperature coefficient of 100 ppm or lower.