Switch-Mode Battery Charger Delivers 5A
The fast-charge controller IC3 (Figure 1) normally directs current to the battery via an external pnp transistor. In this circuit, the transistor is replaced with a 5A switching regulator (IC1) that delivers equivalent power with higher efficiency.
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Read in Source: http://www.maxim-ic.com/appnotes.cfm/appnote_number/86
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