LM2743MTCX/NOPB Integrated Circuits (ICs)

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The LM2743MTCX/NOPB is a non-synchronous, buck-boost DC-to-DC switch-mode controller with integrated high and low-side MOSFETs. This advanced device provides an efficient, easy-to-use solution for a wide range of portable and other space-constrained wide-input voltage applications.

The LM2743MTCX/NOPB features a high-frequency fixed frequency peak current mode control architecture, with the ability to precisely regulate the output voltage across a wide range of input and output voltages. The device’s integrated high and low side N-channel MOSFETs require no external components, minimizing solution size and cost. Additionally, the device’s ultra-low quiescent current supports system-level battery life optimization.

The LM2743MTCX/NOPB’s synchronous-rectified buck converter and diode-rectified flyback converter configuration support up to 97.5% external power efficiency for VIN range from 2.4V to 30V. The wide output range is programmable from 0.8V to 30V, making it suitable for powering various digital, analog and mixed signal loads. This device also supports up to 2.4A of continuous output load current with a total power dissipation of up to 6W.

The device’s wide input capability supports input voltages from 2.4V up to 30V, and its regulated output voltage is dynamically adjustable via an external control pin setting. To reduce solution size and cost, the LM2743MTCX/NOPB features embedded protections, including input under-voltage lockout, overcurrent protection, thermal shutdown, and overvoltage protection.

The LM2743MTCX/NOPB’s wide range of features makes it well-suited for a variety of applications, including automotive, television and audio, wearable electronics, white goods, personal health and fitness, industrial equipment, portable medical and battery-operated systems.

Working Principle

The LM2743MTCX/NOPB uses a fixed-frequency peak current-mode control architecture to precisely regulate the output voltage.

In buck converter configuration, the switching frequency is set by the external resistor connected to the RT/CT pin. The duty cycle is determined by an external error amplifier or an internal error amplifier with no external components. The device’s output voltage is dynamically adjusted via an external control pin, enabling external load tracking.

In flyback configuration, the duty cycle is determined by the voltage of the FB pin. The device’s compensation circuit is used to stabilize the control loop. The maximum duty cycle can be limited by connecting a resistor to the RT/CT pin.

The device is equipped with an integrated high-side N-channel MOSFET and an integrated low-side N-channel MOSFET which provide no-components-required solutions for space-constrained applications. Additionally, the device’s wide input and output voltage range support a range of low to medium power applications.

The LM2743MTCX/NOPB’s comprehensive protection features include input under-voltage lockout, overcurrent protection, thermal shutdown, and overvoltage protection. Additionally, this device’s integrated voltage monitoring circuit at the FB pin monitors the output voltage and can be used to detect an output voltage error event.

Conclusion

The LM2743MTCX/NOPB is a non-synchronous, buck-boost DC-to-DC switch-mode controller with integrated high and low-side MOSFETs. The device’s wide input and output voltage range, high efficiency, no-components-required solutions, and integrated protection features make it a great choice for a wide range of portable and other space-constrained wide-input voltage applications. Additionally, its wide range of features supports input voltages from 2.4V up to 30V with up to 97.5% external power efficiency, making it well-suited for use in applications such as automotive, television and audio, wearable electronics, white goods, personal health, fitness, industrial equipment, and portable medical and battery-operated systems.

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