Hi,
I've been doing some research lately about the LM22676 regulator and I came across an application note for the LM22670 evaluation board ( the Sync pin is not used by default, so it's the same as the LM22676).
The following part of the introduction of this note is quite of a concern to me:
"... . Due to the low RDS(ON) of the integrated N-channel MOSFET and maximum duty-cycle limitations, the minimum input voltage of 4.5V will only provide a 3.3V output voltage for load currents up to 500 mA. For load currents higher than 500 mA, an input voltage of 5.5V or higher is required."
I'm planning to use the LM22676 with a 5V input voltage, Vout=3,3V and I need a load current of at least 2A . When I launch a simulation (startup simulation) in the WEBENCH with Vin=5V and Rload calculated so that I have Iout=2A (Rload=1,65ohm), I have no problem getting 2A load current (see screenshot below).
Hence, I wonder if I can rely on the simulation, or if I missed out on some detail about the eval board, or if it is only the way the eval board is designed that can explain load currents up to 500mA for an input voltage less than 5,5V.
Thank you in advance.
Jean
