LTC4442EMS8E#PBF

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The LTC4442EMS8E#PBF is a quad MOSFET gate driver integrated circuit (IC) specifically designed to drive MOSFETs and IGBTs in applications demanding high frequency, high current, and high voltage switch mode circuits. It is part of the PMIC - Gate Drivers family, which are chips made for the purpose of providing a certain drive strength to MOSFET/IGBTs in motor control applications, switching power supplies and resonant converters. This particular device is designed to provide high side, low side, and floating channel supplies in the tiny, 8-lead MSOP package.

Features

• 8-lead MSOP package
• Quad MOSFET gate driver
• High side, low side, and floating channel supplies
• High frequency, high current, and high voltage switch mode circuits
• Overcurrent, undervoltage lockout, and power up and down sequencing

Application Fields

Due to its design, the LTC4442EMS8E#PBF is an ideal device to use in wide applications such as motor control, power AC/DC and DC/DC converters, switching power supplies, and resonant converters. The device is designed to simplify the layout and reduce the number of external components needed for implementing these applications.

Working Principle

The LTC4442EMS8E#PBF MOSFET gate driver utilizes Pulse Frequency Modulation (PFM) to regulate the current drawn from the supply and cycle by cycle current limiting to limit peak current in cases of overcurrent or short circuit. The PFM regulation works by pulsing the gate drive voltage with a fixed frequency and allowing the current to peak in the inductive load and fall to the holding current. The cycle by cycle current limiting limits the peak current in the event of an overload to prevent destruction of the MOSFET or IGBT.

The device also offers an integrated Under Voltage Lock Out (UVLO) circuitry for protection against voltage transients, and a power up/down sequencing feature which lets the user set up a specific sequence of power up and power down events. This prevents damage to the system by ensuring that all supplies ramp up and down in a predetermined manner.

Conclusion

The LTC4442EMS8E#PBF is an ideal device for use in applications which require high power, high performance, and high voltage switch mode circuits. Its integrated features provide better protection and improved reliability, as well as reduce the number of external components needed, allowing easy design and implementation. It is part of the PMIC - Gate Drivers family, providing the necessary drive strength to MOSFET/IGBTs in motor control applications, switching power supplies, and resonant converters.

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