SNVA213B May   2007  – February 2022 LM2745

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Specifics Of The Board
  4. 3 Feature Options
  5. 4 Specification Summary
  6. 5 Performance Characteristics – Efficiency
  7. 6 Switch Node Voltage and Output Voltage Ripple
  8. 7 Load Transient Response
  9. 8 Bill of Materials
  10. 9 PCB Layout
  11. 10Revision History

1 Introduction

This user's guide describes the LM2745 printed circuit board (PCB) design and provides an example typical application circuit. The LM2745 is a voltage mode PWM buck controller that implements synchronous rectification. It provides a low-cost, high power density, and efficient point of load solution. In steady state operation, the LM2745 is always synchronous, even at no load, simplifying the compensation design. The LM2745 ensures a smooth and controlled start-up when the output is pre-biased. The current limit protection does not require a current limit resistor in the power path, but is achieved by sensing the voltage VDS across the low side MOSFET. Though the control sections of the IC are rated for 3 V to 6 V (VCC), the driver sections are designed to accept input supply rails (VIN) as high as 14 V.