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  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Review the Data Sheet Limits
  6. 3Application-specific FETs
  7. 4Gate Drive Voltage Specifications
    1. 4.1 Absolute maximum VGS
    2. 4.2 Gate-to-source Threshold Voltage, VGS(th)
  8. 5High-side and Low-side Switches
    1. 5.1 Driving a High-side N-channel FET
    2. 5.2 Driving a Low-side N-channel FET
    3. 5.3 Driving a High-side P-channel FET
  9. 6Use a Gate-to-source Resistor
  10. 7Lowest RDS(on)≠ Lowest Power Loss
  11. 8Summary
  12. 9References

5.3 Driving a High-side P-channel FET

As shown in Figure 5-3, P-channel FETs are mainly used as high-side switches due to the simplicity of driving the gate. To turn the device on, the gate is pulled down to GND. To turn the device off, the gate is pulled up to VIN. To avoid damaging the FET, always check the data sheet to make sure that the input voltage, VIN≤ abs max VGS.

P-channel FET High Side SwitchFigure 5-3 P-channel FET High Side Switch