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ST tips power MOSFETs for demanding DC/DC supplies

Posted: 25 Feb 2008     Print Version  Bookmark and Share

Keywords:power MOSFET  DC/DC supplies  converters 

STD60N3LH5 and STD85N3LH5

STMicroelectronics has announced two new power MOSFETs intended for demanding DC/DC converter applications. The new devices use the latest version of ST's STripFET technology to deliver low conduction and switching losses and up to 3W lower in a typical voltage regulator module, and to achieve what the company claims to be the lowest figure of merit—FOM = Rds(on) x Gate Charge (Qg)—among comparable competitive devices.

The new MOSFETs allow practical circuits to operate at higher-than-normal switching frequencies, enabling a reduction in the size of the circuit's passive components. For example, a 10-per cent increase in switching frequency can lead to a 10-per cent reduction in passive components required by the output filter.

The STD60N3LH5 and STD85N3LH5 are the first in a new series of STripFET V devices that promise superior performance and increased efficiency as a result of low ON-resistance and significantly lower total gate charge. Both are 30V (BVDSS) devices. With gate charge (Qg) of 8.8 nanocoulombs (nC), and Rds(on) of 7.2mΩ at 10V, the STD60N3LH5 is suitable choice as a control FET in non-isolated DC/DC step-down converters. The 4.2mΩ Rds(on) at 10V of the STD85N3LH5, with a Qg of 14nC, makes it suitable as a synchronous FET. Both devices are produced in DPAK and IPAK packages and will soon be available in other package options including SO-8, PowerFLAT 3.3x3.3, PowerFLAT 6x5, and PolarPAK. The new series of STripFET V devices are suitable for notebook, server, telecom and networking applications.

ST's STripFET technology makes use of very high "equivalent cell density" and smaller cell features to achieve extremely low ON-resistance and losses, while using less silicon area. STripFET V is the latest generation of this technology, achieving approximately 35 per cent improvement in the critical indicator of silicon resistance and active area, plus some 25 per cent reduction in total gate charge per active area, compared to the earlier generation.

Both devices are in full production. The STD60N3LH5 is priced at Rs.25.59 (65 cents) in quantities of 2,500 pieces, while the STD85N3LH5 is priced at Rs.37.40 (95 cents) in quantities of 2,500 pieces.

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