ROHM’s develops new low on resistance Nch MOSFETs

In recent years, worldwide power consumption has been on the rise – driving the need for industrial equipment such as servers and base stations along with various motors to become more efficient. In a number of these applications that utilise medium voltage MOSFETs, used in a variety of circuits, manufacturers are demanding even lower power losses. However, general MOSFETs are characterised by two main parameters leading to power losses: ON resistance (R_DS(on)), which is inversely proportional to chip size, and Gate-drain charge (Qgd) that increases proportionally with chip size, making it challenging to achieve both. ROHM has improved the trade-off between the two by adopting copper clip connections and improving the gate structure.

The new MOSFETs achieve an industry-leading R_DS(on) of 2.1mΩ – approx. 50% lower than conventional – by increasing device performance and adopting the HSOP8/HSMT8 package featuring low-resistance copper clip connections. What’s more, improving the element gate structure reduces Qgd, which is generally in a trade-off relationship with R_DS(on), by approx. 40% vs conventional products (comparing typical values for R_DS(on) and Qgd for 60V HSOP8 package products). These improvements reduce both switching and conduction losses, greatly contributing to higher application efficiency.

As an example, when comparing the efficiency of a power supply evaluation board for industrial equipment, ROHM’s new products achieve an industry-leading efficiency of approx. 95% (peak) in the output current range during steady-state operation. Going forward, ROHM will continue to develop MOSFETs with even lower R_DS(on) that reduce power consumption in a variety of applications, contributing to solving social issues such as environmental protection through energy conservation.

Application Examples

• Power supplies for servers and communication base stations
• Motors for industrial and consumer products

Also suitable for a variety of power supply circuits and motor-equipped devices