Remember that the 2940 is an LDO, the combination of a 2940 and an external pnp is no longer LDO.
Cheers
Phil

Originally Posted by phil_g

Remember that the 2940 is an LDO, the combination of a 2940 and an external pnp is no longer LDO.
Cheers
Phil

Quite so.

And 2W dissipation for a LM2940 with no heat sink is not 'fine' the device would be on the point of its thermal limit, it will get very hot, 140C or so.

It will be used with LiPO 3s so LDO + pass should be still stable.
Btw Do you know what is the thermal resistance of aluminium plate over TO220?
What's difference between pure plate and heatsinks like this http://www.digikey.com/product-detai...1023-ND/340321
Maybe I'll stay with single heatsinked IC.

My opinion is that there are many applications which are not specifically outlined in manufacturer data sheets that have been in service and operating reliably for years. The fact that so many ESC's contain parallel regulators leads me to believe this is one of those applications that the manufacturers did not cover. This does not mean it doesn't operate properly.
If a regulator starts cutting back it's voltage for reasons of overcurrent or temperature, the paralleled regulators will start taking load. I see no reason that a regulator run at current or temperature limit will fail. The regulator protection circuits are usually very well designed. Does it really matter if one regulator takes all the load until it reaches it's operating limits?

dave1993, you sir, should go here: http://bit.ly/YyWfQ9

MIC 29750 could be a number to consider ... if looking for a linear regulator.

btw. I got nice switching boards here ... but not LDO.
http://dx.com/p/mini-dc-dc-voltage-s...ule-red-126106

amazing , no ???

Alain

switching bec 3a

R1 and R2 would need changing to up the output voltage from 3.3V to 5 or 6V. Depending on the MP2365, the inductor may need changing or the efficiency may not be very good.

These kinds of buck converters are a dime a dozen on dx.com

Originally Posted by viperidae

.

These kinds of buck converters are a dime a dozen on dx.com

yes, but Mp2365 very small, integrated FET .
3A is enough for RC

3A is enough for RC

Correction, 3 amps is enough for your rc. I doubt anyone would run a 3 amp BEC on anything that uses high end digital servos.

Originally Posted by spog

Correction, 3 amps is enough for your rc. I doubt anyone would run a 3 amp BEC on anything that uses high end digital servos.

if your servo use currents 5-10a, you should use the battery separate
use BEC for ampe large is not feasible