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

2 Boot Voltage

The default circuit that comes with the LM2727 demo board uses a bootstrap diode and small capacitor (D1 and CBOOT) to provide enough gate-to-source voltage on the high-side MOSFET to drive the FET. If a separate rail is available that is more than twice the value of VIN, this higher voltage can be connected directly to the BOOT pin, through the BOOT connector, with a 0.1-µF bypass capacitor, CC. In this case, D1 and CBOOT should be removed from the board. Do not connect both CC and CBOOT/D1 at the same time.