Negative charge pump with current protection

专利名称：Negative charge pump with current

protection

发明人：Hong Wu Lin申请号：US12821883申请日：20100623公开号：US08283970B2公开日：20121009

专利附图：

摘要：A charge pump circuit includes a first power transistor selectively actuated by afirst control signal to deliver relatively higher amounts of current to a capacitor and asecond non-power transistor connected in parallel with the first power transistor and

selectively actuated by a second control signal to deliver relatively lower amounts ofcurrent to the capacitor. The charge pump circuit includes a pumped voltage output thatis sensed to generate a sensed voltage output. A comparison circuit compares thesensed voltage output to a threshold voltage. A logic circuit receives an output of thecomparison circuit and enables the first power transistor and disables the second non-power transistor in a first mode of operation if the comparison is not satisfied. The logiccircuit further disables the first power transistor and enables the second non-powertransistor in a second mode of operation if the comparison is satisfied. The logic circuitreturns from the second mode of operation to the first mode of operation after thecomparison is subsequently not satisfied.

申请人：Hong Wu Lin

地址：Shenzhen CN

国籍：CN

代理机构：Gardere Wynne Sewell LLP

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