JAJSB44G October 2011 – July 2018 LMZ10500
The EN pin is internally pulled up to VIN through a 790 kΩ (typical) resistor. This allows the nano module to be enabled by default when the EN pin is left floating. In such cases VIN will set EN high when VIN reaches 1.2 V. As the input voltage continues to rise, operation will start once VIN exceeds the under-voltage lockout (UVLO) threshold. To set EN high externally, pull it up to 1.2 V or higher. Note that the voltage on EN must remain at less than VIN + 0.2 V due to absolute maximum ratings of the device.