Linear Technology Corporation has unveiled the LTC4440A-5, a high-side, high frequency N-channel MOSFET gate driver that operates with an input voltage up to 80V and continues to function with transients up to 100V. This driver, combined with power MOSFETs and DC/DC controllers, forms a complete power supply.
The LTC4440A-5 can operate with a gate drive voltage from 4V to 15V and has been optimised 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 95V above ground. With 6V 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 10ns rise and 7ns fall time when driving a 1,000 pF load minimize switching losses.
The I-grade version of the device 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 suitable for automotive, industrial and military applications subjected to extreme ambient temperatures.