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New load switches work directly from 1.5V core supply voltages

Posted: 08 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:vishay intertechnology? load switch? si3495dv? si3499dv? si8419db?

To help minimize power consumption and increase battery life, many of the ASICs found in portable electronics systems are designed to operate at core supply voltages between 1.5V and 1.65V, said Vishay Intertechnology Inc. However, the lack of power MOSFETs with guaranteed turn-on operation below 1.8V has made it difficult for designers to take advantage of these low core supply voltages without the use of level-shifting circuitry, which adds complexity while increasing power consumption, the company added.

To address this problem, Vishay has developed five new p-channel load switches that are touted to be the industry's first such devices that can work directly from 1.5V core supply voltages with on-resistance as low as 45 milliohms.

With their low threshold voltage and guaranteed specifications at a 1.5V gate drive, these new devices eliminate the need for level-shifting circuitry and maximize the power-saving benefits of low operating voltages in battery-operated systems.

The five power MOSFETs include two devices in the LITTLE FOOT TSOP-6 with 20V (Si3495DV) and -8V (Si3499DV) drain-to-source breakdown voltages and on-resistance ratings at a 1.5V gate drive of 47 milliohms and 45 milliohms, respectively. The three additional devices being released, the -8V Si8419DB, si5499dc and si1499dh, are available in the MICRO FOOT, 1206-8 ChipFET, and SC-70 packages, respectively. Like the new LITTLE FOOT devices, they are rated for a 1.5V gate drive, added Vishay.

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