Power MOSFETs for light and compact switching power conversion devices

STMicroelectronics has extended its MDmesh™ M2 series of N-channel power MOSFETs with the introduction of a new family of devices that offer high power efficiencies in power supplies for servers, laptops, telecom, and consumer applications, especially under light-load conditions. With these new devices, designers can create switching power conversion devices that are lighter and more compact, while more easily meeting increasingly stringent energy-efficiency targets.

The new 600V MDmesh M2 EP devices combine ST’s proven strip layout with a new improved vertical structure and an optimized diffusion process to approach the ideal switch, with very low ON-resistance and the lowest available turn-off switching losses. They are tailored for very-high-frequency converters (f> 150 kHz), making them perfect for the most demanding PSU (Power Supply Unit) applications.

The devices offer low switching losses, especially under light-load conditions for both hard- and soft-switching topologies. In addition to the low gate charge (Qg) exhibited by all MDmesh M2 devices, the M2 EP devices feature up to a 20% reduction in E_off (turn-off energy), thus reducing by the same percentage the turn-off switching losses in hard-switching converters. This E_off reduction in the low current range boosts the efficiency under light-load conditions, where efficiency-certification rules are becoming increasingly demanding.

The enhanced shape of the turn-off waveforms leads to higher efficiency and lower noise in resonant converters, allowing more energy to be stored and re-used, rather than dissipated as heat, cycle by cycle.

Key features of the new MDmesh M2 EP series include

Extremely low Qg (as low as 16 nC)
Optimized capacitance profile for light-load conditions
Optimized Vth and Rg values for soft switching
Body diode ruggedness

Offered in a wide range of packages (PowerFLAT 5×6 HV, DPAK, D2PAK, TO-220, TO-220FP, I2PAKFP, and TO-247) the MDmesh M2 EP family targets power-supply applications that require the highest efficiency levels. All devices are in full production, with pricing starting at $1.5 for the STD15N60M2-EP in a DPAK package for orders of 1000 pieces.

STMicroelectronics
www.st.com