Team,
Customer already used LM3940 but not satisfied the noise performance. By adding more output caps, it seems help but become non-stable. Figure 12 in datasheet only shows Cout = 33uF stable region. Could you please provide more data for their condition below? Or is there any simulation tool they can run by themselves?
4.5Vin to 3.3Vout/500mA, Cout=10uF and 45uF
By the way, is it fine to use ceramic capacitors as long as ESR vs output current located in the stable region?
Thanks.
Allan