Why not use a small transistor as a pass element?
Connect the collector to the supply voltage, the base to the output of the
voltage regulator and the emitter to the circuit to be powered.  This will
be
~.7 volts lower than the output of the regulator, but this will get you to
about 5 volts
which I assume is good enough for the curcuit you are powering.

                                                            Regards,

                                                                Jim
----- Original Message -----
From: Rick Mann <rmann@LATENCYZERO.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, January 25, 2002 10:46 PM
Subject: [EE]: Can you put multiple voltage regulators in parallel for more
power?


> I was going to use a voltage regulator from Toko America, what Digi-Key
> listed as a 260 ma 5.5 volt regulator (datasheet:
> http://207.208.84.9/semiconductors/pdf/tk112xxb.pdf).
>
> However, when it arrived and I started looking at the data sheet, it
seemed
> to be only a 150 ma regulator. What I'd like to know is, can I safely put
> two of these together, both outputs tied to the same positive (circuit)
> supply rail? Will I then be able to get 300 ma out of the two regulators?
>
> If I can't tie them to the same supply rail, can I run some of my
components
> off a separate rail? For example, can I have one regulator power the LCD
in
> my circuit, and the other regulator power the MCU, but still have output
> pins of the MCU connected to input pins of the LCD, and everyone sharing a
> common ground?
>
> As a side question, does anyone know of a 250 - 300 ma 5.5 volt
> surface-mount regulator?
>
> TIA,
>
> --
> Rick
>
> --
> http://www.piclist.com hint: To leave the PICList
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>
>

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