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LM9076S-3.3-Battery Sync Solution

Rajatshuvra Datta
Prodigy 50 points
Other Parts Discussed in Thread: LM9076

We are using a TI linear voltage regulator for Battery Sync. What I want to know is is it OK to put a 0.1F supercap on the output to keep the Vcc rail up for a second or so after the input voltage is removed. The regulator is 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.

          ( (0.1F / 400mA) x 3.3V ) = 825 milli-sec

    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.