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

1 Introduction

The LMR51610 regulator is an easy to use synchronous step-down DC-DC converter operating from 4.5-V to 65-V supply voltage. The regulator is capable of delivering up to 1-A DC load current in a very small design size. The family has different versions applicable for different applications, 400-KHz and 1.1-MHz switching frequency, PFM and FPWM, adjustable and fixed output voltage. The LMR51610 employs peak-current mode control with internal loop compensation, which reduces design time, and requires few external components. The family includes the LMR51606 with lower maximum output current.

To convert a buck to an IBB, use the LMR51610EVM as an example. Change Vout to GND and GND to -Vout, notice the device GND is the negative output, but input side system GND in does not change, and needs to be connected to the inductor output side as shown in Figure 1-1.

GUID-20230904-SS0I-5CXK-XMLD-DNLH8RM5RZ6G-low.svgFigure 1-1 Comparison of a Buck Converter and Inverting Buck-Boost Topology With Same IC