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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 High-side and Low-side Switches

Power MOSFETs are used as both high-side and low-side switches. What is the difference and how is the gate driven? A high-side switch places the FET between the input supply and the load. A low-side switch places the FET between the load and ground. Simplified examples are shown in Figure 5-1 and Figure 5-2.

N-channel FET High Side SwitchFigure 5-1 N-channel FET High Side Switch
N-channel FET Low Side SwitchFigure 5-2 N-channel FET Low Side Switch