from what I had gathered it is a BTL class H design, with a charge pump (a charged capacitor is placed in series with the main rail at momentary peaks) to boost the rails when needed without the aid of a DC/DC converter. Almost similar to the operation of a TDA1562Q I think. see link below
http://www.youtube.com/watch?v=z6M-itzlRJY
http://www.youtube.com/watch?v=z6M-itzlRJY
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