Vishay Siliconix MOSFETs Push The Power Resistance Down
The low on power resistance of 43 mΩ at 4.5 V is incorporated in a chipscale 0.8 mm by 0.8 mm package. They power MOSFETs which can be used for battery or load switching in power management applications for portable electronics
Vishay Intertechnology Inc. has introduced new 12 V and 20 V n-channel and p-channel TrenchFET power MOSFETs with what it claims is the industry's lowest on-resistance smallest CSP form factor: the 0.8 x 0.8 x 0.4 mm MICRO FOOT package.
The devices are suited for battery or load switching in power management applications for portable electronics such as smartphones, tablet PCs, and mobile computing devices.
Vishay says the MOSFETs' compactness saves PCB space and provides ultra-thin profiles to enable slimmer and lighter portable electronics while their low on-resistance translates into lower conduction losses for reduced power consumption and longer battery life between charges. The devices' low on-resistance also means a lower voltage drop across the load switch to prevent unwanted undervoltage lockout.
For the first time in this form factor, the MOSFETs are built on an ultra-high-density technology that uses self-aligning process techniques to pack one billion transistor cells into each square inch of silicon.
When combined with MICRO FOOT's packageless CSP technology, this provides one of the lowest on-resistances possible for a given outline area.
For n-channel devices, the result is a 43 milliohms (mΩ) maximum on-resistance at a 4.5 V gate drive for the 12 V Si8806DB. When a 20 V rating is needed, the Si8812DB offers a maximum on-resistance of 59 mΩ. The n-channel devices are optimal for high-speed switching applications with fast turn-on/off times of less than 100 ns, such as DC/DC boost converter applications.
The -20 V p-channel Si8817DB and Si8489EDB are optimised for buck converter applications. With 76 mΩ maximum on-resistance at a 4.5 V gate drive, the smaller 0.8 x 0.8 x 0.4 mm Si8817DB will be used for applications where space is even more critical than on-resistance. The 1 x 1 mm Si8489EDB will be used when the lower maximum on-resistance of 54 mΩ at 4.5 V is more critical.
The Si8489EDB is claimed to be the first p-channel Gen III device in the 1 x 1 mm form factor, and it provides 2500 V typical ESD protection. What's more, the Si8817DB offers on-resistance ratings down to 1.5 V, allowing the device to work with the lower-voltage gate drives and lower bus voltages common in handheld devices, saving the space and cost of level-shifting circuitry.
Samples and production quantities of the latest TrenchFET power MOSFET are available now, with lead times of 12 to 14 weeks for larger orders.
