Linear Technology’s H-grade version of the LTC4444/-5 100V input supply voltage, synchronous mosfet gate driver is designed to drive upper and lower power N-channel mosfets in synchronous rectified converter topologies.

The H-grade chip operates over a junction temperature range of -40°C to 150°C, compared to the I-grade version’s -40°C to 125°C operating temperature range.

Adaptive shoot-through protection is integrated to minimize dead time while preventing both the upper and lower mosfets from conducting simultaneously. These powerful drivers can source up to 1.4A with a 1.5ohm pull-down impedance for driving the top mosfet and a source current of 1.75A with a 0.75Ohm pull-down impedance for the bottom mosfet.

It can drive multiple mosfets in parallel for higher current applications. Switching losses are minimized by the fast 8ns rise, 5ns fall time of the top mosfet and 6ns rise, 3ns fall time of the bottom mosfet when driving a 1,000pF load.

Both parts are available in a thermally enhanced MSOP-8 package.

For more information, see http://www.linear.com/4444