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Driver rolls for upper, lower power n-channel MOSFETs

Posted: 08 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET driver? DC/DC converter? synchronous regulator?

Linear Technology Corp. has released the LTC4447, a high-speed synchronous MOSFET driver designed to drive upper and lower power n-channel MOSFETs in a synchronous rectified converter topology.

The driver, combined with power MOSFETs and one of Linear's DC/DC controllers, forms a complete high efficiency synchronous regulator that can be used as a step-down or step-up DC/DC converter.

The LTC4447 drives both upper and lower MOSFET gates from rail-to-rail over a voltage range of 4- to 6.5V and operates from a supply voltage up to 38V. The driver can sink up to 5A and source up to 3.2A, making it suitable for driving high gate capacitance, high current MOSFETs. The LTC4447 can also drive multiple MOSFETs in parallel for higher current applications and includes an integrated bootstrap Schottky diode. The fast 8ns rise time, 7ns fall time of the top MOSFET and 7ns rise time, 4ns fall time of the bottom MOSFET, when driving a 3,000pF load, minimize switching losses and improve efficiency. Adaptive shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously while minimizing dead time.

In addition, the driver has a 3-state pulse-width modulation input for power stage shutdown that is compatible with single and multi-phase controllers employing a 3-state output feature. It also has a separate supply for the input logic to match the signal swing of the controller IC and undervoltage lockout circuits on both the driver and logic supplies.

The LTC4447 is offered in a low profile (0.75mm) 3mm x 3mm DFN-12 package and operates over a -40C to 85C temperature range with prices starting at $1.35 for 1,000-piece quantities.

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