48 V Bus Compatible 1.2 V/100 A Double Step-Down DC-DC Converter

In recent years, saving energy in servers has become an urgent issue because of the rapid increase in server power consumption. To resolve the issue, Toshiba has developed this 48V bus compatible DC-DC converter with 1.2V/100A output.
This design is a two-stage DC-DC converter capable of delivering 1.2V/100A to various devices from the 48V bus line. Since each stage uses Toshiba power MOSFETs that have good balance between on-resistance and charge characteristics, it achieves high efficiency.
Design tips on each portion of the circuit, method of operation, and design information such as circuit diagrams and PCB patterns are available, please use them for your design.

PCB Photo (example)
Board Appearance
TPH1400ANH TPH1400ANH TPH5R60APL TPH5R60APL TPH8R903NL TPH8R903NL TPHR9203PL1 TPHR9203PL1

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Features

  • Provides 1.2 V/100 A from the 48 V bus line very efficiently
  • Total efficiency 83 % (Vin = 50 V at 100 % load condition)
  • Outline size : 198 mm x 151 mm
  • Provides the latest power MOSFET totally

Description

Input voltage DC 40 V to 59.5 V
Output voltage DC 1.2 V
Output power 120 W
Circuit topology Double Step-Down DC-DC Converter (Non-Isolated Sychronous Buck DC-DC + Non-Isolated Sychronous Buck DC-DC)
Efficiency Curves
Efficiency Curves

Design Documents

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Design Data

Provides circuit data that can be loaded into EDA tools, PCB layout data, and data used in PCB manufacturing. Available in formats from multiple tool vendors. You can freely edit it with your preferred tool.

Used Toshiba Items

Part Number Device Category Portion Usage Description
Power MOSFET (N-ch single 60V<VDSS≤150V) First stage high-side・2 N-ch MOSFET, 100 V, 0.0136 Ω@10V, SOP Advance, U-MOSⅧ-H
Power MOSFET (N-ch single 60V<VDSS≤150V) First stage low-side・2 N-ch MOSFET, 100 V, 0.0056 Ω@10V, SOP Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) Second stage high-side・5 N-ch MOSFET, 30 V, 0.0089 Ω@10V, SOP Advance, U-MOSⅧ-H
Power MOSFET (N-ch single VDSS≤30V) Second stage low-side・5 N-ch MOSFET, 30 V, 0.00092 Ω@10V, SOP Advance(N), U-MOSⅨ-H

Related Documents

We provide materials useful for designing and considering similar circuits, such as application notes for installed products. Please click on each tab to view the contents.

Applications

Server
Such as low power consumption and miniaturization are important in designing server. Toshiba provides information on a wide range of semiconductor products suitable for power supply units, motor driving unit, over temperature monitoring unit, etc., along with circuit configuration examples.
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