Open LED protection circuitry prevents the device from damage as the result of white LED disconnection. The TPS61169 monitors the voltage at the SW pin and FB pin during each switching cycle. The circuitry turns off the switch FET and shuts down the device when both of the following conditions persist for 3 switching cycles: (1) the SW voltage exceeds the VOVP threshold, and (2) the FB voltage is less than 30mV. As the result, the output voltage falls to the level of the input supply. The device remains in shutdown mode until it is enabled by toggling the CTRL pin.