7.3.8 Undervoltage Lockout (UVLO)

The TPSM84424 implements internal UVLO circuitry on the VIN pin. The device is disabled when the VIN pin voltage falls below the internal VIN UVLO threshold. The internal VIN UVLO rising threshold is 4.1 V (typical) with a typical hysteresis of 200 mV.

Applications may require a higher UVLO threshold to prevent early turnon, for sequencing requirements, or to prevent input current draw at lower input voltages. An external resistor divider can be added to the EN pin to adjust the UVLO threshold higher. The external resistor divider can be configured as shown in Figure 20. Table 9 lists standard values for R_UVLO1 and R_UVLO2 to adjust the UVLO voltage higher.

Figure 20. Adjustable UVLO