Astonishing little AC/DC-adaptor

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SUMMARY

The discussion centers on the compact design of a voltage adaptor used for charging Ericsson portable phones, which utilizes the LTC1541 IC chip. Unlike traditional transformers that generate heat due to ohmic resistance, this adaptor remains cool even when plugged in, indicating the use of advanced switching power supply technology. The LTC1541 chip enables efficient voltage regulation and minimizes energy loss, contributing to the adaptor's small size and lightweight characteristics.

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kuengb
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I have a question that maybe an engineer could answer. The voltage adaptor that came with my portable phone (Ericsson) in order to recharge its batteries made me wonder a lot. It is very small, about the size of a matchbox, and yet not much heavier. It's hard to believe that there's a coil with an iron core hidden inside, as in a standard voltage transformator. I also noticed that normal trafo's get warm simply if they're plugged in (and not in use) as a result of the ohm resistance (or whatever the word is) of the coil - this one doesn't.

Can anyone explain to me what technique is used here?
 
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Based on this article:

http://www.elecdesign.com/Articles/Index.cfm?ArticleID=6185

They use a LTC1541 IC chip. Here are the specs:

http://www.linear.com/pdf/15412fas.pdf
 
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