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Synchronous driver rolls for n-channel MOSFETs

Posted: 29 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous N-Channel power MOSFET driver? rectified converter topology?

Linear Technology Corp. has introduced a high-speed synchronous MOSFET driver designed to drive upper and lower n-channel power MOSFETs in a synchronous rectified converter topology. Combining the LTC4442/-1 driver with Linear Technology's DC/DC controllers forms high-efficiency synchronous regulators that can be used as step-down or step-up DC/DC converters.

This powerful driver can sink up to 5A and source up to 2.4A, making it ideal for driving high gate capacitance and high current MOSFETs. It can also drive multiple MOSFETs in parallel for higher current applications. The fast 12ns rise time, 8ns fall time of the top MOSFET and 12ns rise time, 5ns fall time of the bottom MOSFET, when driving a 3,000pF load, minimize switching losses. Adaptive shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously, minimizing dead time.

The LTC4442/-1 has a 3-state PWM input for power stage shut-down that is compatible with all multi-phase controllers employing a 3-state output feature. In addition, it has a separate supply for the input logic to match the signal swing of the controller IC and has an undervoltage lockout circuit on both the driver and logic supplies. Furthermore, this part drives both upper and lower MOSFET gates over a range of 6.2V to 9.5V and operates up to a 38V supply voltage. The -1 version has a higher VCC undervoltage lockout of 6.2V instead of 3.2V, intended to drive standard 5V logic N-Channel MOSFETs.

The LTC4442/-1 is offered in a thermally enhanced MSOP-8 package, operating over the -40C to 85C temperature range, priced starting at $1.25 for 1000-piece quantities.




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