Recommendation for a "common" 3.3V LDO regulator?

[John]

My head is absolutely spinning after trying to find an easily
available (i.e., multiple source) "generic" LDO voltage regulator to
power a PIC and a few components. Just too darn many choices.

The specs are:
- Max. output current = 75mA (probably only 50mA)
- Output voltage = 3.3V
- Lowest input voltage = 3.6V
- Highest input voltage = 5.1V
- DIP package would be nice (for prototyping), SOIC OK.
- Lower noise is nice as I'm using a PIC ADC input.

Any favorites of yours that you might recommend?
Thanks!

John

 

[DJ Delorie]

The one I use most is Microchip MCP1700 (SOT23 and TO92, although I
only use SOT23). 178 mV dropout (i.e. 3.5v min for 3.3v out), up to
6v in. 250mA out depending on heatsink and package.

I also have some generic TO220 linears.

 

[Brendan Gillatt]

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DJ Delorie wrote:

The one I use most is Microchip MCP1700 (SOT23 and TO92, although I
only use SOT23). 178 mV dropout (i.e. 3.5v min for 3.3v out), up to
6v in. 250mA out depending on heatsink and package.

I also have some generic TO220 linears.

I second that - the 1700 seems to work great for everything I've done.
It'll even work without a cap on the output (don't ask how I know that
;]), though I don't suggest doing it on purpose!

If you're getting PICs you may as well choose the parts from the same place.

- --
Brendan Gillatt
brendan {at} brendangillatt {dot} co {dot} uk
http://www.brendangillatt.co.uk
PGP Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBACD7433
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[John Larkin]

On Tue, 18 Dec 2007 16:48:40 -0500, John
<jmuchow@SPAMMENOTcamlight.com> wrote:

My head is absolutely spinning after trying to find an easily
available (i.e., multiple source) "generic" LDO voltage regulator to
power a PIC and a few components. Just too darn many choices.

The specs are:
- Max. output current = 75mA (probably only 50mA)
- Output voltage = 3.3V
- Lowest input voltage = 3.6V
- Highest input voltage = 5.1V
- DIP package would be nice (for prototyping), SOIC OK.
- Lower noise is nice as I'm using a PIC ADC input.

Any favorites of yours that you might recommend?
Thanks!

John

LP2985 is nice. It's stable with ceramic output caps.

John

 

[John]

Nice parts, thanks for the recommendations!
I've ordered samples of each to play with.

John