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Technology Front

Compact, High Power Synchronous Boost DC/DC Converter

Published: Mar 10,2016

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ROHM has recently announced the availability of a compact, high-efficiency, high power synchronous boost DC/DC converter IC optimized for single-cell battery applications.

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Many of today's portable devices (i.e. smartphones and tablets) are driven by single-cell li-ion batteries that deliver an output of approximately 4.2V at full charge. However, when connecting to interfaces requiring 5V output, such as USB, HDMI, and audio amps for speakers, a DC/DC converter is needed to boost the voltage. At the same time, longer battery life along with greater efficiency are demanded in a smaller form factor.

In response, the BD1865GWL features a lower operating limit of 2.5V, prolonging battery life in devices by extending operation down from the conventional 2.7V. In addition, two operating modes are built in, PWM/PFM mode and ROHM's original mixing PWM mode.

The former ensures up to 90% efficiency across all load regions, while the latter prevents unwanted switching noise in audio applications. The BD1865GWL is also capable of delivering output currents up to 2A in a compact 1.6mm x 1.6mm package, contributing to greater end-product miniaturization.

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