SLVAFP0 December   2023 LMR51610

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Specifications
    1. 2.1 Input Voltage Range
    2. 2.2 Output Current Range
  6. 3External Component Selection
    1. 3.1 Duty Cycle Calculation
    2. 3.2 Output Voltage Calculation
    3. 3.3 Inductor Selection
    4. 3.4 Input and Output Capacitor
    5. 3.5 Enable Level Shift
    6. 3.6 Output Clamp Diode
  7. 4Evaluation Results
    1. 4.1 Typical Performance
    2. 4.2 Loop Response Bench Verification
  8. 5Conclusion
  9. 6References
  10. 7LMR50410 Design Example
    1. 7.1 LMR50410 Output Current Range
    2. 7.2 LMR50410 Efficiency

Abstract

The Invert Buck-Boost (IBB) circuits structure are widely used in systems which require a negative voltage power supply. The SOT package is a cost-effective, and well-established package. This application note provides a detailed design procedure for the LMR51610/06 in an IBB configuration. The newly released SOT23-6 package product LMR51610/06 is a buck convertor in 65 V 1 A/0.6 A with internal loop compensation, which is a good start to verify the typical -5 V and -12 V output for operational amplifiers circuit. LMR51610 maximum input voltage is high up to 65V, this can provide a wider range and more safe power rail for 12 V /24 V system. TI also provide a demo hardware for LMR51610, this will make it convenient to develop an IBB application on SOT236 device with same pinout.

The LMR51610 is introduced in Section 1. The input voltage and output current ranges when a buck converter IC is configured as buck-boost topology in detailed in Section 2. Section 3 provides the method to choose external components. In Section 4, bench performance test result are provided.