LM2681M6

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LM2681M6 Application Field and Working Principle

The LM2681M6 is a voltage regulator integrated circuit from Texas Instruments. As a DC/DC Switching Regulator, it is used in a variety of applications where a stable supply of constant current is needed. It is also used for power management of sensitive consumer electronics, as well as industrial systems.

Features of the LM2681M6

The LM2681M6 features a wide input voltage range of 2.7V to 32V, allowing it to supply components with any voltage within the range. Additionally, its "PowerGood" indicator pin indicates when the output voltage has stabilized. This helps monitor and ensure consistent performance of the circuit. Moreover, it has a maximum fixed output current of 5A and a very low quiescent current of 4.5mA. Additionally, it has a maximum operating temperature of 125°C and a very low noise of 10mV peak-to-peak.

Applications of the LM2681M6

Due to its stability and low quiescent current, the LM2681M6 is particularly useful when supplying power to a number of low power components such as sensors, displays and keypads. It is also used in applications that require a reliable supply of higher current such as industrial systems and robotics. Additionally, it is used to power various applications in the automotive industry including instrumentation, navigation systems and telematics.

Working Principle of the LM2681M6

The LM2681M6 is a step down voltage regulator that operates in either a constant voltage or constant current mode. It uses Pulse Width Modulation (PWM) to regulate its output voltage or current. It works in a number of steps: first, the current across a sense resistor is monitored by the voltage monitoring and current limiting control, which in turn controls the output current. Then, the current is converted to a digital signal with an onboard A/D converter. Finally, the digital signal is used to control the PWM pulse width modulation voltage regulator, which adjusts the output voltage or current accordingly.

The LM2681M6 also incorporates several features to protect against overload and over-temperature. An overload protection circuit is used to protect against output current overloading, and an over-temperature alarm will be triggered if the temperature exceeds the minimum specified level. Furthermore, the LM2681M6 also features a soft start circuitry to prevent over-current when first powering on the system.

Conclusion

The LM2681M6 is a useful DC/DC Switching Regulator that can provide a reliable and stable supply of constant current. Its wide input voltage range, maximum output current of 5A, low quiescent current of 4.5mA and over-temperature and overload protection make it an ideal choice for a variety of applications. Additionally, it is also used to supply power to components with low power requirements, such as sensors, displays and keypads, as well as industrial and automotive systems.

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