New low ON resistance Nch MOSFETs deliver high-efficiency operation

ROHM has developed Nch MOSFETs (40V/60V/80V/100V/150V) RS6xxxxBx / RH6xxxxBx series, 13 part numbers, appropriate for applications operating on 24V/36V/48V power supplies such as base stations, servers, and motors for industrial and consumer equipment.

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

The new MOSFETs attain an industry-leading RDS(on) of 2.1mOhm – approximately 50% lower than conventional – by increasing device performance and adopting the HSOP8/HSMT8 package providing low-resistance copper clip connections. Moreover, improving the element gate structure lowers Qgd, which is typically in a trade-off relationship with RDS(on), by approximately 40% versus conventional products (comparing typical values for RDS(on) and Qgd for 60V HSOP8 package products). These improvements lower switching and conduction losses, significantly contributing to higher application efficiency. For example, when comparing the efficiency of a power supply evaluation board for industrial equipment, its new products accomplish an industry-leading efficiency of approximately 95% (peak) in the output current range during steady-state operation.

Application examples include power supplies for servers and communication base stations; motors for industrial and consumer products; and is also ideal for various power supply circuits and motor-equipped devices.