6A MOSFET increases output power, efficiency of DC/DC controller

Milpitas, CA — Linear Technology Corporation introduces the LTC4441, a 6A MOSFET gate driver designed to increase the output power and efficiency of a DC/DC controller by allowing it to drive higher power N-channel MOSFETs or multiple MOSFETs in parallel. The LTC4441's gate drive voltage is adjustable from 5V to 8V, allowing designers to choose either standard threshold or logic level MOSFETs rather than limiting the choice to only one type of MOSFET or using two different MOSFET drivers.

The LTC4441 also features an open-drain output with adjustable leading edge blanking to prevent ringing when sensing the source current of the power MOSFETs. The LTC4441 has a wide input supply range from 5V to 25V and provides a simple solution for increasing the output power capability of power supplies in telecom and industrial systems, including improved drive capability in motor/relay control and line drivers.

The LTC4441 includes a linear regulator for gate drive that is adjustable from 5V to 8V with an external resistor. Propagation delay for driving a 4.7nF capacitance with 7.5V drive voltage is only 30ns. Moreover, a robust design permits the logic threshold driver input to be driven below ground or above the driver supply. Also, a TTL/CMOS compatible input threshold allows a low voltage digital signal to drive standard power MOSFETs. Other protection features are undervoltage lockout and overtemperature circuits which disable the driver output when activated. The LTC4441 is housed in a thermally enhanced 10-lead MSOP and can easily sink and source up to 6A peak output current. An 8-lead SO package, the LTC4441-1, is also available without the blanking function.

The LTC4441 and LTC4441-1 are rated for operation from -40°C to 85°C. 1,000-piece price starts at $1.80.

Summary of LTC4441 Features:
* 6A Peak Output Current
* Wide Input Supply Range from 5V to 25V
* Adjustable Gate Drive Voltage from 5V to 8V
* Logic Input Can be Driven Below Ground
* Adjustable Blanking Time Reduces Ringing
* 30ns Propagation Delay

LTC4441 data sheet

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