LM3674MFX-ADJ

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The LM3674MFX-ADJ is a synchronous buck regulator controller with an integrated 2.5A power MOSFET. This controller is suitable for a wide range of applications. It has an operating temperature range of -40°C to +125°C, an input voltage range of 2.7V to 18V, and a wide output voltage range of 0.9V to 12V. It is suitable for supplying 1A to 2.5A loads from sources from 2.7V to 24V. The device has excellent line and load transient performance, and can support a maximum peak load current of 4A.

The LM3674MFX-ADJ belongs to the PMIC – Voltage Regulators – DC DC Switching Regulators category. It utilizes a synchronous buck regulation architecture and offers a wide output voltage adjustment range. The switching frequency is set through a resistor. Not only does it provide excellent current accuracy, but it also offers peak-to-peak ripple specification of 25mV at full load and low output voltage.

The LM3674MFX-ADJ features both current-mode and voltage-mode control. It provides stable loop performance even at high gains and improves light load efficiency. It also has a very fast response time of the inner loop for faster transient response, with a minimum load current of 30mA for improved light load efficiency.

The LM3674MFX-ADJ also provides various components to ensure appropriate input and output conditions. It includes a power MOSFET, ESD protection, soft-start/stop and thermal regulation/protection, as well as overvoltage/undervoltage protection. It also includes a high voltage startup regulator for enabling buck operation at input voltages above 6V.

In terms of operating principle, the LM3674MFX-ADJ utilizes the buck regulator architecture. The main components include a synchronous rectifier and buck switch (an n-MOSFET) along with the error amplifier and feedback signal. The oscillator signal is used to drive the internal MOSFET on and off. When the switch is switched on, the voltage across the inductor builds up, and when it is switched off, the voltage across the inductor discharges into the output. Based on the error amplifier, the controller adjusts the switching frequency and the duty cycle of the MOSFET to make sure that the output voltage remains constant.

In summary, the LM3674MFX-ADJ is a high-performance power converter controller that is well-suited for a wide range of DC-DC buck conversion applications. It is suitable for supplying 1A to 2.5A loads from sources from 2.7V to 24V. It utilizes a synchronous buck regulation architecture with excellent current accuracy and can support a maximum peak load current of 4A. It also provides various components to ensure appropriate conditions, and features a fast response time, excellent line and load transient performance, adjustable switching frequency, and overvoltage/undervoltage protection.

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