Re: Powering a LPC2114 ARM7

From: Lewin A.R.W. Edwards (larwe_at_larwe.com)
Date: 01/06/04 

Date: 6 Jan 2004 03:32:45 -0800

> I am designing a board using a Philips LPC2114 (nice chip). It uses
> 1.8v for the core, 3.3v for I/O, and I also need 5v for some other
> circuits on the board. None of them use much current. The power
> supply is a 12v battery.

This question has arisen in the Yahoo LPC2100 discussion group
recently. Most people recommended linear regulators. Certainly, all
the extant and proposed EVBs use them. But, most people are not
designing battery-powered appliances. You can certainly realize higher
efficiencies with alternative designs, though.

> the battery? Is there a single device, such as a DC/DC converter
> that can produce these voltages?

Not exactly. You can construct a SMPS that will generate all the
required voltages, but the cost will be quite substantial. If this not
a high-volume consumer product you're designing, it is easier - much
easier - to use linear regs.

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