LM3743MM-1000

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When it comes to power management methods for DC devices, LM3743MM-1000 is a standout switching controller. It provides a way to regulate DC voltages from 3.5V to 24V, offering improved thermal performance, greater efficiency, and user-friendly features, with a built-in 35A N-channel external switch MOSFET.

Application Field

LM3743MM-1000 is a DC/DC switching regulator for mobile applications such as notebooks and PDAs that require a single-output, step-down solution. It can also be used in automotive, automotive audio, and industrial markets.

The device offers simple design and improved product reliability, with adjustable soft and hard start, adjustable duty cycle, and support for a wide input voltage range. Additionally, the regulator features an internal power switch with 35A peak current limit with an output switch MOSFET of up to 5Ohms.

Working Principle

The LM3743MM-1000 regulator efficiently converts input power to output power using a step-down switch converter operating in continuous conduction mode (or discontinuous conduction mode, as needed). The device contains two switching MOSFETs, a current sensing compares, and two current sensing resistors.

To switch the output voltage, the device realizes pulse width modulation (PWM) by comparing the error voltage output of the current sense amplifier (simple voltage-mode control loop) with an internally generated voltage waveform. The current sensing resistor at the output senses current flowing through the external switch MOSFET, and the error voltage is generated by the error amplifier.

The device can be used in buck converters, allowing it to deliver a regulated output voltage regardless of the load or input voltage. The step-down switch converter works as follows: The controller regulates the output voltage by modulating the on and off times of the external switch MOSFET, ensuring that the power delivered to the load is equal to its regulation voltage. It then compensates for load and input voltage changes, maintaining a constant output voltage in the presence of various load conditions.

Conclusion

The LM3743MM-1000 switching controller is a power management solution suitable for use in a variety of applications. It offers efficient power regulation, improved thermal performance and reliability, as well as a user-friendly design. Furthermore, the regulator can maintain a constant output voltage in the presence of varying load and input voltages.

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