SNVA057D August   2002  – February 2022 LM2727 , LM2737

 

  1.   Trademarks
  2. 1Introduction
  3. 2Boot Voltage
  4. 3Dual MOSFET Footprints
  5. 4Low-Side Diode
  6. 5Additional Footprints
  7. 6Layout Optimization
  8. 7PCB Layout
  9. 8Revision History

1 Introduction

The LM2727 evaluation board has been designed for a wide variety of components in order to show the flexibility of the LM2727 chips. The input voltage limitations are the same as the chip: 2.2 VDC to 16 VDC. The regulated output voltage range is from 0.6 V up to 85% of the input voltage. Output current is limited by the components chosen, however, the size of this board and the limitation to SOIC-8 MOSFETs means a realistic limit of about 10 A.

The example design steps 12 V down to 3.3 V at 4 A, with a switching frequency of 800 kHz. This design can be modified by following the Design Considerations section of the LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages data sheet.

The board is four layers, consisting of signal/power traces on top and bottom, with one internal ground plane and an internal split power plane. All planes are 1-oz. copper, and the board is 62-mil FR4 laminate.