Patent ID: 7902908
Filing Date: 2011-03-08
Classification: H02M,H03K,H05B,Y02B

Abstract:
1. A switched capacitor controller comprising: a first MOS transistor having a first portion that includes a first gate and having a second portion that includes a second gate, the first gate configured to form a first on-resistance of the first MOS transistor, the second gate configured to form a second on-resistance for the first MOS transistor that is less than the first on-resistance, the first MOS transistor configured to couple a pump capacitor to receive a first current to charge the pump capacitor; a second MOS transistor having a first portion that includes a first gate and a having a second portion that includes a second gate, the first gate configured to form a first on-resistance of the second MOS transistor, the second gate configured to form a second on-resistance for the second MOS transistor that is less than the first on-resistance, the second MOS transistor configured to couple the pump capacitor to provide a second current to a load; a first circuit configured to enable the first portion of the first MOS transistor but not the second portion of the first MOS transistor to charge the pump capacitor responsively to a first voltage on one of the pump capacitor or a load capacitor being no greater than a first value; the first circuit configured to enable the first portion of the second MOS transistor but not the second portion of the second MOS transistor to provide the second current to the load responsively to the first voltage being no greater than the first value; the first circuit configured to enable the first and second portions of the first MOS transistor responsively to the first voltage being no less than the first value; and the first circuit configured to enable the first and the second portions of the second MOS transistor responsively to the first voltage being no less than the first value.