MOSFET gate driver operates over -55 to 150 degrees C junction temperature range

October 02, 2013 // By Paul Buckley
Linear Technology Corporation has unveiled a high-side, high frequency N-channel MOSFET gate driver that operates with an input voltage up to 80 V and continues to function with transients up to 100 V.

The LTC4440A-5 driver, combined with power MOSFETs and one of Linear Technology’s many DC/DC controllers, forms a complete power supply.

The LTC4440A-5 can operate with a gate drive voltage from 4 V to 15 V. It is optimized for driving logic-level MOSFETs and contains an undervoltage lockout circuit that disables the external MOSFET when activated. The input ground-referenced logic signal is internally level-shifted to the high-side gate drive supply, which can operate continuously at up to 95 V above ground. With 6 V of gate drive, the LTC4440A-5 has a 1.1A peak pull-up current and a1.8 Ohm pull-down impedance, making it ideal for driving high gate capacitance, high current MOSFETs, along with driving multiple MOSFETs in parallel for higher current applications. Its fast 10 ns rise and 7 ns fall time when driving a 1,000 pF load minimize switching losses.

The LTC4440A-5 I-grade version operates over a -40°C to 125°C junction temperature range. The H-grade version is guaranteed over a -40°C to 150°C operating junction temperature range and the MP grade is guaranteed from -55°C to 150°C, making it ideal for automotive, industrial and military applications subjected to extreme ambient temperatures.

Availability and Pricing

The LTC4440A-5 is available in a thermally enhanced 8-lead MSOP package. The 1000-piece price starts at $1.89 each.

More information about the LTC4440A-5 driver at