DC/DC Buck

Once the mains power supply has been efficiently converted from AC to DC, industrial systems often require further DC/DC conversion to provide the right sub-system supply voltage. This can be from 5 V to as low as 1.2 V for the logic supply voltage for ICs on a motherboard. Switching converters (such as buck converters) provide much greater power efficiency for DC/DC conversion than linear regulators.

Block diagram

S2 can be replaced by one Schottky diode to be in asynchronous mode.

Highlighted components are Nexperia focus products

Design challenges

  • Point of load non-isolated DC/DC buck converter circuit
  • Step-down of voltage while stepping up current
  • Easily switch from asynchronous to synchronous buck converter circuit depending on choice of low-side diode or MOSFET
  • Economical, two-MOSFET design - low QG(tot) and low FOM for best efficiency
  • Lower switch losses improve thermal behaviour
  • LFPAK and CFP (both clip-bond package) allow a high-efficiency DCDC converter solutions, while reducing costs (less heating to dissipate)
  • Possibility to go to higher switching frequency (FSW), which leads to smaller inductances and smaller capacitors
  • Best thermal performance thanks to clip-bonding package

MOSFET and GaN FET Handbook

Drawing on over 20 years’ of experience, the MOSFET and GaN FET Application Handbook: A Power Design Engineer’s Guide brings together a comprehensive set of learning and reference materials relating to the use of MOSFETs and GaN FETs in real world systems.

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