What is the minimum ON time of ADP2441?
The maximum operating frequency is limited by the minimum on-time and the
required duty cycle. ADP2441 has minimum on time of 50ns. Low minimum on-time
makes ADP2441 suitable for applications that require a very high step-down
ratio. For example, ADP2441 can step down supply from 24V to 1.2V at 1 MHz