| 摘要 |
Methods and apparatus may provide for multiple input voltage regulation in which a current supplied to an output node divides among voltage regulators according to their respective input voltages when the difference in input voltages falls within a voltage range. When the difference in input voltages falls outside of the voltage range, then the current to the output node is supplied substantially through the voltage regulator with the highest input voltage. In some implementations, the voltage range may be determined, at least in part, by a transistor gate-to-source threshold voltage characteristic. In one example, a dual input voltage regulator system in a combination smart card supplies current from contact and/or contactless (e.g., inductively coupled) power sources based on a relative voltage between the respective input voltages.
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