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Hi,

Harold Hallikainen schrieb:
> We currently have several products running off an unregulated external
> 12VDC power supply (wall wart). Inside our product, we run through a
> 1N4001 for reverse polarity protection, then 1n LM7805 to regulate to +5V
> (to run the PIC!). Upcoming California Energy Commission regulations
> outlaw these external power supplies (due to lack of efficiency and
> standby power). We could replace these with 12V regulated switchers, but
> that is pretty inefficient. What I'd like to do is replace them with
> external 5V switchers, yet continue to allow the use of the old power
> supplies. It would be great if there were an LDO equivalent of the TO-200
> LM7805 with reverse polarity protection (so I could get rid of the diode
> and its drop). Anyone aware of a drop-in replacement?

look at the L2940 or L4940 (Reverse-protection) or LM2931 (100mA),
or LF50 and a Shottky-Diode (1N5818),
or LP2950...


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