TPS54540BQDDAQ1

The operating quiescent current of the TPS54540B-Q1 device is 146μA under a no-load condition (not switching). When the device is disabled, the supply current is 2μA.

The TPS54540B-Q1 device has a default input start-up voltage of approximately 4.3V. The EN pin can be used to adjust the input voltage undervoltage lockout (UVLO) threshold with two external resistors. An internal pull-up current source enables operation when the EN pin is floating. The operating current is 146μA under a no-load condition (not switching). When the device is disabled, the supply current is 2μA. The device has an input voltage range from approximately 4.3V onwards, which can be adjusted using external resistors.

The purpose of the integrated high-side MOSFET in the TPS54540B-Q1 device is to provide a step-down regulator with a high-side N-channel MOSFET, implementing constant frequency, current mode control to reduce output capacitance and simplify external frequency compensation. This allows for either efficiency or size optimization when selecting the output filter components. The high-side MOSFET resumes normal operation after an undervoltage lockout condition is resolved.