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