Q: TPS62290 feedback divider R1 and R2 by 687520


In order to set Vout = 1.5V the datasheet recommends to use R2=180k and R1=270k.
Is it possible to use R2=120k and R1=180k?

Are there any disadvantages, except higher current thru the divider, to expect?


A: TPS62290 feedback divider R1 and R2 by 1090425

This is ok but will give slightly lower efficiency at very very light loads where the divider current becomes a significant portion of the load current.  I would recommend optimizing the Cff per this app note: http://www.ti.com/lit/an/slva289/slva289.pdf  You can start with a 33 or 47 pF.

There is also the newer TPS62060 which might give a smaller solution size and better high load efficiency.