SPVA032 September   2025 LM5152-Q1 , LP8866-Q1 , LP8866S-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Expected System Challenges Without Pre-Boost
    1. 2.1 Undervoltage Protection of High-Side Switch
    2. 2.2 System Bias Power Interruption
    3. 2.3 Unexpected Lower Input Voltage on LED Driver
    4. 2.4 Unexpected Higher Input Current Condition in the System
  6. 3Design Suggestion to Resolve the System Challenges by Using Pre-Boost
    1. 3.1 Block Diagram and Test Results
    2. 3.2 Key Design Considerations
  7. 4Summary
  8. 5References

4 Summary

This application note demonstrates how a pre-boost can stabilize automotive display applications even under low battery conditions especially during cranking events by using LM5152-Q1. As the automotive display panel size becomes larger in the market, the power requirements increase. This is more difficult for designers to achieve stable and robust systems in power management. However, the LM5152-Q1 provides a reliable pre-boost design which can also implement dithering feature for EMI performance. This design helps designers achieve more efficient and reliable automotive display systems even with simplified software design.