SNOSDI8 May   2024 LMG2650

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 GaN Power FET Switching Parameters
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  GaN Power FET Switching Capability
      2. 7.3.2  Turn-On Slew-Rate Control
      3. 7.3.3  Current-Sense Emulation
      4. 7.3.4  Bootstrap Diode Function
      5. 7.3.5  Input Control Pins (EN, INL, INH, GDH)
      6. 7.3.6  INL - INH Interlock
      7. 7.3.7  AUX Supply Pin
        1. 7.3.7.1 AUX Power-On Reset
        2. 7.3.7.2 AUX Under-Voltage Lockout (UVLO)
      8. 7.3.8  BST Supply Pin
        1. 7.3.8.1 BST Power-On Reset
        2. 7.3.8.2 BST Under-Voltage Lockout (UVLO)
      9. 7.3.9  Overcurrent Protection
      10. 7.3.10 Overtemperature Protection
      11. 7.3.11 Fault Reporting
    4. 7.4 Device Functional Modes
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
  • RFB|19
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.7.2 AUX Under-Voltage Lockout (UVLO)

The AUX UVLO blocks the INL pin from turning on the low-side GaN power FET and blocks the INH pin from turning on the high-side GaN power FET if the AUX voltage is below the AUX UVLO voltage. Figure 7-3 shows the AUX UVLO blocking operation. The AUX UVLO voltage is set higher than the BST UVLO voltage so the high-side GaN power FET can be operated when the low-side GaN power FET is operating. The voltage separation between the AUX UVLO voltage and BST UVLO voltage accounts for operating conditions where the bootstrap charging of the BST-to-SW capacitor from the AUX supply is incomplete. The AUX UVLO voltage hysteresis prevents on-off chatter near the UVLO voltage trip point.