several questions on UA78M00 series

1. UA78M00 series LDOs only have 53°C/W junction-to-ambient thermal resistance based on SOT-223 pakage, which seems much better than the other competitors, it's very good. But I wonder, this value is based on the devices working on board in still air with no heatsink, or with a certain area coppers(1 SQ inch 1 ounce copper or 1 SQ inch 2 ounce copper) on board?

The DCY package used a JESD 51-7 standard board and setup. The other devices must use the same standard to compare.

      2. How much is the UA78M00 series LDO Quiescent Current?

The Quiescent Current is labelled “Bias Current” in the data sheet because the UA78M00 is not really a LDO.

3. How to choose the input and output capacitors for the UA78M00 series LDO? How about the capacitance value and the capacitor type? Does it have output capacitor ESR limit?

Capacitors are not needed, but they do help transient response. There are no limits on size or type.

4. How about the PSRR when the frequency beyond 1 KHz(from 1 KHz to 1 MHz)?

I do not have this data. Without an output capacitor, PSRR falls at -20dB per decade. With a capacitor, higher frequency PSRR will be improved.

Regards,

Ron M.