I am looking at using the MP2348 in a design and am not sure why there is a note under Table 2: Parameter Selection in its datasheet indicating that for a Vout of 5V, Vin should not be lower than 6.5V. I presume it has to do with max duty cycle, but when I look at the minimum off time of 190 ns and consider the oscillator frequency is 650 kHz typical, I would think the max duty cycle should be around 87%. A duty cycle of 5 / 6.5 is more around 76%. Am I missing something or is that ~10% the recommended headroom? I am looking to scale down from 5V from USB-C down to around 3.8V to feed into an LDO (to scale down to 3.3V). This would be a duty cycle of 76% as well. This is a USB Power Delivery application so I should be able to request higher voltage to get headroom if needed but wanted the option to run off of 5V into the system as well. Any additional info or advice would be appreciated.
The frequency is quite all over the place, could be as high as 800khz
Plus if we are getting persnickety. No max minim off time is listed. So you could convince yourself that this part is useless, that you can’t be certain it will do 12 to 5 successfully by looking at the datasheet.
When a company says that their product cant do something, my first impluse is to believe it.
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The MP2348 is a versatile step-down converter, and its performance, including the maximum duty cycle, is crucial when operating at lower input voltages. For a detailed understanding of its capabilities and applications, you might find the MP2348 series overview insightful, as it highlights various operational parameters and design considerations for this device.