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LM9076S-3.3: Supercap on regulators

Tom Harris
Prodigy 160 points
Other Parts Discussed in Thread: LM9076

Greetings,

For a new design we need to have a second's worth of extra time when the input volts goes down. We are thinking of using the LM9076S-3.3 regulator since it is automotive rated. Is it possible to simply add a supercap on the output of the regulator, providing that we can cope with the drop in voltage as it discharges?

LM9076S-3.3
  • 0
    TI__Mastermind 22610 points

    Yes, OK to do.

    At 'power-on' the output cap will be charged at the LM9076 short circuit current rate (~400mA TYPICAL) so there may be some noticeable delay for a Super-cap to charge.

    With Super-cap on the output the resulting load pole is so low, it effectively kills the loop response, so the typically required zero from the output capacitor esr (1/(2 x pi x Cout x esr) ) is pointless.