Non-Isolated Buck DC-DC Converter

This reference design provides design guide, data and other contents of multiple non-isolated buck DC-DC converter power supplies. Multiple variations of the power supply are optimized for various outputs, loads and board mounting areas.

Photo of non-isolated buck DC-DC converter.
Simple block diagram of non-isolated buck DC-DC converter.

Features

  • Non-Isolated Buck DC-DC Converter with synchronous rectification
  • 8 power supply circuit designs with different output voltage and output power
  • Each power supply circuit design has 3 variations

Description

Input voltage DC 12 V
Output voltage/current 5V/5A、5V/8A、5V/12A、3.3V/10A、3.3V/13.3A、3.3V/18.2A、1.5V/10A、1.05V/10A
Optimization Each design is optimized for efficiency at 50% load and 100% load and also for small size
Design Variations 24
Efficiency curves of non-isolated buck DC-DC converter.
Efficiency Curves

Design Documents

Design Documents contain the documents below.

Design Data

Design Data contains the contents listed below.

*1:Actual PCB was designed on CR5000BD. The other files were made from CR5000BD file.

*2:The data was generated on CR5000BD.

Used Toshiba Items

Part Number Device Category Portion Usage Description
Power MOSFET (N-ch single VDSS≤30V) High-side/Low-side N-ch MOSFET, 30 V, 0.011 Ω@10V, SOP Advance, U-MOSⅧ-H
Power MOSFET (N-ch single VDSS≤30V) Low-side N-ch MOSFET, 30 V, 0.002 Ω@10V, SOP Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) Low-side N-ch MOSFET, 30 V, 0.0029 Ω@10V, SOP Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) High-side N-ch MOSFET, 30 V, 0.0032 Ω@10V, SOP Advance, U-MOSⅧ-H
Power MOSFET (N-ch single VDSS≤30V) High-side N-ch MOSFET, 30 V, 0.004 Ω@10V, SOP Advance, U-MOSⅧ-H
Power MOSFET (N-ch single VDSS≤30V) Low-side N-ch MOSFET, 30 V, 0.0048 Ω@10V, SOP Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) High-side/Low-side N-ch MOSFET, 30 V, 0.0089 Ω@10V, SOP Advance, U-MOSⅧ-H
Power MOSFET (N-ch single VDSS≤30V) Low-side N-ch MOSFET, 30 V, 0.00065 Ω@10V, SOP Advance(N), U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) Low-side N-ch MOSFET, 30 V, 0.00092 Ω@10V, SOP Advance(N), U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) High-side N-ch MOSFET, 30 V, 0.011 Ω@10V, TSON Advance, U-MOSⅧ-H
Power MOSFET (N-ch single VDSS≤30V) Low-side N-ch MOSFET, 30 V, 0.0016 Ω@10V, TSON Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) Low-side N-ch MOSFET, 30 V, 0.0029 Ω@10V, TSON Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) High-side N-ch MOSFET, 30 V, 0.0043 Ω@10V, TSON Advance, U-MOSⅧ-H
Power MOSFET (N-ch single VDSS≤30V) Low-side N-ch MOSFET, 30 V, 0.0052 Ω@10V, TSON Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) High-side/Low-side N-ch MOSFET, 30 V, 0.0089 Ω@10V, TSON Advance, U-MOSⅧ-H

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