Fast 100 V MOSFET driver handles high capacitance gates

19 November 2003 Power Electronics / Power Management Residential Estate (Industry)

Linear Technology's LTC4440 is a 100 V transient tolerant high-side N-channel MOSFET driver with powerful gate drivers that minimise switching losses in power supplies.

Housed in ThinSOT (SOT-23) and 8-lead MSOP packages, the IC's 80 V (100 V transient) operation, peak pull-up output current of 2,4 A and 1,5 Ω pull-down output impedance make it ideally suited for driving high gate capacitance, high voltage and high current standard threshold MOSFETs.

The IC improves the efficiency and output power capability of a DC/DC converter by reducing MOSFET gate drive fall and rise times to 7 and 10 ns, respectively, when driving 1000 pF loads. The LTC4440 is designed to improve power supply performance in 48 V telecom systems as well as distributed power systems in industrial and automotive applications. It features supply independent TTL/CMOS compatible input thresholds. The input logic signal is internally level-shifted to the boot-strapped supply, which may function at up to 115 V above ground.

The IC contains both high side and low side undervoltage lockout circuits that disable and protect the external MOSFET when activated. The LTC4440 is rated for extended temperature range operation from -40 to 85°C ambient.

For more information contact Memec SA, 011 897 8600.

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