5V Supply High-Side Switcher

  
Requiring only 10uA of quiescent current, the circuit of (Fig. 62-1 (a)) produces only 0.1ohm ON-resis-tance.
5V Supply High-Side Switcher - schematic

IC1 is a charge pump voltage converter to produce a 5V level, so analog switch IC2 can provide a 10-V swing to MOSFET Ql. This circuit uses a voltage converter to enable the analog switch to apply a 4.3V swing to logic level NMOS power transistor Q1. ON resistance is 0.03ohm 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 converter for an NMOS switching transistor.




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