Charge_pump_with_shutdown

Published:2009/7/24 8:43:00 Author:Jessie | From:SeekIC

In this circuit, a MAX660 charge pump is used as a voltage inverter, creating a negative voltage of approximately equal magnitude to the input voltage. Although the MAX660 has no feedback mechanism, and so is unregulated, the output is a stiff, accurate supply when operated from a regulated input. An output current of 100 mA results in a typical voltage loss of 0.65 V (the drop at 10 mA is less than 100 mV). The FC input selects a 10- or 45-kHz oscillator frequency. Notice that this circuit provides an optional shutdown that disables the internal oscillator, and reduces the supply current to less than 1μA.



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