At 08:49 AM 2/1/02 +1300, you wrote:
>
>The LM2941 has a regrettably high quiescent current in shut down mode.

I don't see it specified. It isn't the horrible regular Iq is it? 8-(
It's a lateral-PNP type that draws a LOT of current when Vin-Vout gets
small and at high output currents.

>The LM2936 cannot be shut down but has a much lower quiescent current  -
>around 10uA in practice AFAIR - still too high in many cases.

More expensive, but there is the LP3964 which uses an internal MOSFET
pass transistor. 15uA in shutdown., but  doesn't have the automotive
resistant specs of the LM2941. Too high a shutdown current to eliminate
the on/off switch in many applications, but a heck of a lot better than
the few-mA Iq of a 78xx.

Best regards,
Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
9/11 United we Stand

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