> He only intends to run the PIC off the 5V

Here's a thought - how efficient would it be for a PIC to be booted
up on 3V and then boost its own Vcc with a doubler monitored by
its comparator or ADC ? Say for example you have a battery-powered
PIC device that needs TTL-level outputs on occassion. Seems to me
a higher Vcc could be maintained without too much wastage

Just idle musings

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