Maximum current from VIO_3V3X

[lpcware]

Content originally posted in LPCWare by lsimons on Wed Feb 01 11:58:56 MST 2012
I am prototyping a design with an LPCXpresso 1769 board, and was wondering how much current can be provided by the VIO_3V3X (VOUT) pin on the board?  I have found schematics for the target side of the board, but can't seem to find details on the emulation side and what kind of power supply it provides.

Thanks,
Louis

[lpcware]

Content originally posted in LPCWare by lsimons on Wed Feb 01 13:55:38 MST 2012

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Quote: Zero
That's no problem. IIRC I've connect >150mA already. It's just important to reduce power while flashing (with low active Chip Select... ) :rolleyes:

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That's good news, thanks!

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Wed Feb 01 13:08:41 MST 2012

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Quote: lsimons
...50 mA...

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That's no problem. IIRC I've connected >150mA already. It's just important to reduce power while flashing (with low active Chip Select... ) :rolleyes:

[lpcware]

Content originally posted in LPCWare by lsimons on Wed Feb 01 13:01:01 MST 2012
Thanks for the link.  I'm looking for around 50 mA to drive a fairly high power LED (worst case scenario).

So, given the CAT6219's (http://www.onsemi.com/pub_link/Collateral/CAT6219-D.PDF) 500mA tops, at 5V from the computer and 3.3V out, there's 0.85W trying to get out.  The thermal resistance says there should be a temperature rise of 200C, which is well above the junction temperature range, which should put the chip in thermal shutdown.  Maybe there's some diodes in the path dropping voltage (dissipating power) along the way.

Anyway, looks like I have enough to make the power budget work without being too close to the edge.

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Wed Feb 01 12:47:00 MST 2012
How much current do you need?

See #6 of http://knowledgebase.nxp.com/showthread.php?t=2614