5_VSUPPLY_HIGH_SIDE_SWITCHER

Published:2009/7/10 4:07:00 Author:May | From:SeekIC

Requiring only 10 uA of quiescent current, the circuit of (Fig. 62-1(a)) produces only 0.1-Ω ON-resis-tance. IC1 is a charge pump voltage converter to produce a -5-V level, so analog switch IC2 can provide a 10-V swing to MOSFET Q1. This circuit uses a voltage converter to enable the analog switch to apply a 4.3-V swing to logic level NMOS power transistor Q1. ON resistance is 0.03 Ω typical. This circuit uses additional stages in the voltage-multiplying circuit to provide a higher gate voltage swing. This would enable the use of a convener for an NMOS switching transistor.



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