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Can I hack ADP2140 to produce a different voltage on the switching output?

Hello everybody

I have a legacy design in which 3.3V and 1.8V are produced using the ADP2140ACPZ3318.

There are no available parts on available at any distributor.

I was thinking to use the 2.5/1.8 or the 1.2/1.8V versions which are available,

and force the switching supply to produce 3.3V by inserting a resistor in the feedback path

(between FB pin and inductor as in Fig.1 of the datasheet).

Could you recommend me the value of the resistor to use

Alternatively, I would appreciate to if someone could reply with the input impedance or the bias current on the FB pin.


Dorin Calbaza

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