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MC33730 linear regulators

Question asked by alessandrocorti on Mar 30, 2020
Latest reply on Mar 31, 2020 by G.w. Sun

Hello all,

I'm going to use the MC3370 chip in an environment where I need only the 5V and the 3.3V voltages.

I don't need to use any stand by supplies, I know the VKAM is always active (also with the chip in sleep mode) and this is ok for me, I want to use VDDL as 3.3V source and I don't need more.

To save power in stand by, I want to program the VDD3 regulator as 3.3V, not stand by regulator, but I don't need it because I use the VDDL regulator as 3.3V source, here my question, have I to add the external pass NPN transistor and bypass capacitors to the VDD3 circuitry (VDD3_B and VDD3), or can I simply left open these two pins (VDD3_B and VDD3)?

Thanks a lot,

Regards.

 

Alessandro

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