MOSFET driver goes high and low

Hgh-speed high-input-voltage synchronous MOSFET driver powers upper and lower power N-channel MOSFETs in synchronous rectified convertor topologies.

Linear Technology has announced the LTC4444, a high-speed, high input supply voltage (100V) synchronous MOSFET driver designed to drive upper and lower power N-channel MOSFETs in synchronous rectified convertor topologies.

This driver, combined with power MOSFETs and one of Linear Technology's many DC/DC controllers, form a complete high efficiency synchronous convertor.

This powerful driver can source up to 2.5A with a 1.2ohm pull-down impedance for driving the top MOSFET and source 3A with a 0.55ohm pull-down impedance for the bottom MOSFET, making it ideal for driving high gate capacitance, high current MOSFETs.

The LTC4444 can also drive multiple MOSFETs in parallel for higher current applications.

The fast 8ns rise time, 5ns fall time of the top MOSFET, and 6ns rise time, 3ns fall time of the bottom MOSFET when driving a 1000pF load minimise switching losses.

Adaptive shoot-through protection is integrated to minimise dead time as well as preventing the upper and lower MOSFETs from conducting simultaneously.

The LTC4444 is configured for two supply-independent inputs.

The high-side input logic signal is internally level-shifted to the bootstrap supply, which may function at up to 114V above ground.

Furthermore, this part drives both upper and lower MOSFET gates over a range of 7.2 to 13.5V.

The LTC4444EMS8 and LTC4444IMS8 are offered in thermally enhanced MSOP-8 packages with prices starting at US $1.69 for 1000-piece quantities.

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