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DC-DC Converters (Non-Isolated)

Circuit Example

img_non_isolated_01_e

Features
  • A DC-DC converter converts a direct current from one voltage level to another. While non-isolated DC-DC converters are primarily used for applications requiring less than 30 W, up to 100 W can be handled by adding a single MOSFET. Many DC-DC converters are deployed in cell phones and mobile devices that are becoming smaller, lighter and more feature-rich.
Application Examples
  • POL modules
  • CPU and memory power supplies
  • On-board DC-DC converters
  • Cell phones
Recommended Parts
* ouptut_voltage / input_voltage
MOSFET Selection

The optimal pair of a high-side and a low-side MOSFET depends on the required output current.
The figure at right shows examples of efficiency curves when the input is at 19 V and the output is at 3.3 V (output-to-input voltage ratio = 0.17). Notice that, at up to 4 A, using the TPH8R903NL for both low and high sides delivers higher efficiency than using the TPH8R903NL/TPH6R003NL pair, and that at higher than 4 A, using the TPH8R903NL/TPH6R003NL pair as the high-side and low-side MOSFETs provides higher efficiency. The above table gives examples of recommended MOSFET pairs according to the output current requirement.

img_non_isolated_02_e

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·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.