SLUAAP4 October   2023 LM2005 , LM2101 , LM2103 , LM2104 , LM2105 , LM5108 , UCC27531 , UCC27710 , UCC44273

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Gate Driver IC Configurations
  6. 3Key Voltage and Current Specifications
    1. 3.1 Voltage Ratings
    2. 3.2 Peak Current
  7. 4Robustness Features
    1. 4.1 Undervoltage Lockout
    2. 4.2 Negative Voltage Handling
    3. 4.3 Cross-Conduction Protection
  8. 5Board Space, Thermal Performance, and Other Considerations
  9. 6Summary
  10. 7References

3 Key Voltage and Current Specifications

The primary specifications to consider when choosing a gate driver are:

  • Gate driver voltages – VDD, VHS, and VHB(1)
    • VDD refers to the voltage on the positive supply rail (pin often named VDD or VGVDD or VCC).
    • VHS (half-bridge drivers only) refers to the high-side source connection to the power switch (pin often named HS or SH). This can also be called the switch node voltage.
    • VHB (half-bridge drivers only) refers to the voltage on the high-side bootstrap supply pin (often named HB or BST). VHB is given as VHS + VDD.
  • System voltage – VBUS
    • VBUS refers to the voltage at the drain of the high-side of a half-bridge (also called DC link voltage).
  • Gate driver current – Peak source and sink currents (IPK)
    • Sometimes referred to as peak pullup and pulldown currents, or collectively as drive strength.
1. Note that VHB and VHS do not apply to low-side drivers.