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Original question:

LM61495: How to identify fixed versions for 5V and 3V3

LM61495: Regulating fixed output parts

Soren Steen
Prodigy 10 points
Part Number: LM61495

Hi, 

I have a design, where I use the adjustable variant LM61495RPHRQ1 to provide roughly 5.2V output voltage to allow for some voltage drop in cables etc. 

By mistake, LM61495Q3RPHRQ1 was ordered and mounted for the prototypes. 

Adjusting feedback resistor divider for a 3.3V instead of 1.0V reference voltage seem to work just fine. 

Are there any complications in performance, stability or other issues preventing me from using the 3.3V or even 5V as an AVL/alternative part for production?

Br. Soren

  • 0
    TI__Guru 50120 points

    Hello Soren,

    The internal resistors are in terms of MOhms effective resistance.

    You can adjust a fixed 3.3V to get a higher voltage, but you cannot adjust a fixed 5V and get a lower voltage, that is the cavet.

    Internal compensation is the same between fixed and adjustable and is mainly related to output capacitance. 

    Though I would recommend you use the correct device to generate the 5.2V output, there is nothing stopping you from using a fixed output and generating a voltage higher than the set point.

    Regards,

    Jimmy