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LM2941 Output Capacitor

Gregory Watkins
Expert 4005 points
Other Parts Discussed in Thread: LM2941

Datasheet for LM2941 specifies minimum of 22uF for the output capacitor in order to maintain stability.  Is this reccomendation for nominal capacitance or should measures be taken to ensure Cout is >22uF over temp, frequency, lifetime, etc.  Additionally are there any known problems with the output capacitance being composed of multiple capacitors (say 2x12uF) other than reduced ESR?

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    TI__Mastermind 22610 points

    The 22uF Cout is the minimum capacitance across the guaranteed operating range (Vin, Vout, Iout, and  Temperature).

    In some circumstances you might be able to get away with a bit less capacitance, but you would need to confirm that the device is behaviour is acceptable to your specific needs as you would be operating outside the TI requirements. I strongly recommend sticking to the 22uF minimum.

    I would presume that 'lifetime' would be a consideration if you have harsh operating environments, or certain expectations for performance over time.

    There are no issues with multiple parallel capacitors as long as the minimum Cout and ESR requirements are met.