LM2681M6X

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LM2681M6X Application Field and Working Principle

LM2681M6X is a PMIC-Voltage Regulators-DC DC Switching Regulators IC which is suitable for applications from1.8V to 8V. It\'s a low noise and high efficiency DC-DC converter. The LM2681M6X is a fixed frequency switching step-down regulator with Burst Mode. The input voltage range is from 4.5V to 26V. It offers 1A/2A switch current limit and can provide high efficiency over a wide input voltage range.

Application Field

The LM2681M6X can be used in a wide range of applications, ranging from industrial to consumer products, such as motor drivers, home appliances, lighting, and white goods like ovens and washing machines. Furthermore, with the low noise, high efficiency and high current operation, this IC is an excellent choice for high performance, portable, and battery-powered products such as notebooks, cellular phones, and versatile hand-held devices. It is also suitable for applications where space is limited and weight is a critical factor.

Working Principle

The LM2681M6X\'s main component is composed of a low RDS(ON) NMOS power MOSFET switch, an error amplifier, a comparator and a voltage reference. The IC regulates its output voltage according to the voltage reference with an error amplifier in the feedback loop. The comparator is used to detect when the load current reaches a certain set limit and the PWM duty cycle is adjusted accordingly. The duty cycle is then increased to further reduce the switch current. The low RDS(ON) switch further contributes to efficient operation, as it is capable of handling workload up to 1.5A.The feedback voltage from the output voltage is amplified by the error amplifier and compared with the voltage reference. The voltage reference sets the operating voltage of the LM2681M6X. The comparator monitors the load current and adjusts the duty cycle of the switch accordingly. When the load current reaches the switch current limit, the duty cycle is decreased, thus reducing the total power dissipation. Moreover, the burst mode operation of the LM2681M6X enables low ripple attenuation even when the input voltage is low. This ensures that the output voltage is not affected by the input voltage fluctuations. Additionally, the LM2681M6X has very clean turn-off characteristics, thereby reducing the ringing of the output voltage ripple.

Conclusion

The LM2681M6X is an ideal PMIC-Voltage Regulators-DC DC Switching Regulator IC for low noise, high efficiency operation in a wide range of applications from industrial to consumer products. With its ultra-low power dissipation and adjustable switching current limit, it is capable of delivering up to 1.5A output current at efficiencies up to 91%. It also incorporates a burst mode operation for low ripple attenuation at low input voltages, making the LM2681M6X a great choice for applications which require low noise, high performance and high efficiency operation.

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