SNOSD45B February   2018  – October 2018 LMG1020

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified LiDAR Driver Stage Diagram
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Stage
      2. 7.3.2 Output Stage
      3. 7.3.3 VDD and undervoltage lockout
      4. 7.3.4 Overtemperature Protection (OTP)
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Handling Ground Bounce
        2. 8.2.2.2 Creating Nanosecond Pulse With LMG1020
      3. 8.2.3 VDD and Overshoot
      4. 8.2.4 Operating at Higher Frequency
      5. 8.2.5 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Gate Drive Loop Inductance and Ground Connection
      2. 10.1.2 Bypass Capacitor
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.5 Application Curves

LMG1020 waveform_02_90ns_pulse_from_function_generator_yielding_15ns_on_the_gate_snou150.pngFigure 11. 90 ns Pulse from Function Generator Yielding 15 ns Pulse On The Input (Cyan) And Gate (Blue) After Pulse Shortening
LMG1020 waveform_04_1pt2ns_pulse_yielding_1pt5ns_30v_into_1ohm_pulse_snou150.pngFigure 13. 1.2 ns Gate Pulse Yielding 1.5 ns 30V Into 1 Ω Pulse (500MHz Scope)
LMG1020 waveform_03_84ns_pulse_from_function_generator_yielding_1pt5ns_on_the_gate_snou150.pngFigure 12. 90 ns Pulse from Function Generator Yielding 1.5 ns Pulse On The Input (Cyan) And Gate (Blue) After Pulse Shortening
LMG1020 tida-01573-vds-1-5ns-pulse-with-40v-bus-voltage.gifFigure 14. VDS for 1.5 ns Pulse With 40V of Bus Voltage

Figure 11 and Figure 12 are the waveforms showing the pulse short pulse generation and input/output pulses. The 90ns long pulse (in green color) and its delayed signal are sent through an AND gate, which outputs a short pulse signal as the input of LMG1020. The output signal (in blue color) follows the input (in cyan color) with certain propagation delay. An output pulse short as 1.5 ns can be obtained as Figure 12.

Figure 13 is taken with a 500MHz oscilloscope and shows typical operation waveforms, including the input logic gating signal (cyan), gate signal (blue), and drain to source signal (pink) of the switching GaN FET. On the drain waveform of the FET, it is possible to see a 20V overshoot. This is due to the inductance in the power loop. Vg seems to be oscillating, but this is caused by pickup noise, which is inevitable even when using a spring ground connection.

Figure 14 shows the waveform of drain to source voltage of a FET driven by LMG1020 with 1.5ns pulse width and 300ps fall time, which drives maximum 60A current at 40V bus voltage.