The TPS541620 integrates an internal LDO, generating 5 V for control circuitry and MOSFET drivers. The (BP5) LDO output is monitored and generates a power okay signal, enabling internal circuits when the voltage is 3 V or greater. The signal disables internal circuits when the BP5 voltage is 2.7 V or lower. The BP5 pin must have a minimum 1-μF bypass capacitor placed as close as possible to the pin and properly grounded. BP5 is not designed to power external circuitry. The UVLO on BP5 voltage turns off the device when BP5 voltage is below the threshold. It prevents the TPS541620 from operating until the BP5 voltage is enough for the internal circuitry. Hysteresis on UVLO prevents the part from turning off during power up if V_IN droops due to momentary input current demands.