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MOS transistor for internal regulator ?

Question asked by Stephane on Sep 18, 2012
Latest reply on Oct 4, 2012 by jobo23

What are the required specs of the MOS transistor for the internal regulator ?

I looking to find a cheaper alternative to FDS9431A or IRF7424.

There are many SOT23 transistors with sufficient current and voltage (2 A, 20 V)

but very different Gate Charge (Qg) and Input Capacitance (Ciss) among others.

Is it enough to look at the VGS threshold ?

Or are there other required caracteristics ?

Should I optimise Qg or RDSon for better efficiency ?