We started building the Kobot from the power card. The power card is the main power source of Kobot's. It is 30X20mm in size and has two TPS60130 step-up converter chips from TI. The input to the power card is either from one-cell Li-Poly battery having a nominal voltage of 3.7V or from 3-cell AAA-size NiMH batteries having a nominal voltage of 3.6V. The output is a constant, almost ripple free 5V.
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