pass device Ron resistance

Hi Jutek

Power loss in an ldo is based on voltage drop across it and current through it, not by "on resistance" since the pass device is not used as a switch...why do you need to know "on resistance"..?

Thanks QQ

Reply to
QQ
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hello

what is the Ron resistance of PMOS pass device in the LDO? is that 1/gds?

regards

Reply to
jutek

  • Cgs * (effective voltage gain).

Do the math if you want to prove it. The term is Miller capacitance.

Tim

-- Deep Fryer: a very philosophical monk. Website:

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Reply to
Tim Williams

QQ wrote(a):

to calculate pole position properly.

one more question: Is input capacity of this PMOS equal to Cgs+Cgd?

Reply to
jutek

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