High Speed Synchronous N-Channel MOSFET Driver Delivers 5A for High Efficiency Buck or Boost DC/DC Converters

MILPITAS, CA, (PresseBox) - Linear Technology Corporation introduces the LTC4447, a high speed synchronous MOSFET driver designed to drive upper and lower power N-Channel MOSFETs in a synchronous rectified converter topology. This driver, combined with power MOSFETs and one of Linear Technology'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 4V to 6.5V and operates from a supply voltage up to 38V. This powerful driver can sink up to 5A and source up to 3.2A, making it ideal for driving high gate capacitance, high current MOSFETs. The LTC4447 can also drive multiple MOSFETs in parallel for higher current applications and it includes an integrated bootstrap schottky diode. The very 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.

The LTC4447 has a 3-state PWM input for power stage shut-down that is compatible with single and 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 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 -40°C to 85°C temperature range with prices starting at $1.35 for 1000-piece quantities.

Summary of Features: LTC4447

- Synchronous N-Channel MOSFET Driver
- High Drive Current - 3.2A Source, 5A Sink
- 38V Maximum Supply Voltage
- 4V to 6.5V Gate Drive Voltage
- Integrated Bootstrap Schottky Diode
- Adaptive Shoot-Through Protection
- Top Gate: 8ns Rise Time, 7ns Fall Time when driving
- Bottom Gate: 7ns Rise Time, 4ns Fall Time When Driving
- Three-State PWM Input for Power Stage Shutdown
- Rail-to-Rail Output Drivers


Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule(TM) products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit www.linear.com.

LT, LTC, LTM, Burst Mode and are registered trademarks and uModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.

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