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Linear unveils high speed synchronous MOSFET driver

Posted: 29 Nov 2007     Print Version  Bookmark and Share

Keywords:VCC undervoltage; Synchronous N-Channel;controller IC 


Linear Technology Corp. has introduced the LTC4442/-1, a high speed synchronous MOSFET driver designed to drive upper and lower N-Channel power MOSFETs in a synchronous rectified converter topology. This driver, when combined with many of Linear Technology DC/DC controllers, forms a complete high efficiency synchronous regulator that can be used as a step-down or step-up DC/DC converter.

This powerful driver can sink up to 5A and source up to 2.4A, making it ideal for driving high gate capacitance, high current MOSFETs. The LTC4442/-1 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, minimise switching losses. Adaptive shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously, minimising 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 -40°C to 85°C temperature range, priced starting at Rs.49.44 ($1.25) for 1000-piece quantities.

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