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LV2862: Max resistance on RFB

Part Number: LV2862

Buck regulator team,

One of our customers wants to use the LV2862 in a low power application, and would like to minimize the current through the FB resistors.  The datasheet gives a typical value of up to 100kOhm for R2.  If R1+R2 is closer to 1MOhm, what do they need to do to make sure the design remains stable?

In this case, Vout is 3.3V. 

Thanks,
Darren