LM4132EMF-3.3

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Power management integrated circuit products are used in a variety of electronics applications. These integrated circuits provide high-performance voltage regulation, voltage reference, and monitor functions. The LM4132EMF-3.3 is a voltage reference IC specifically designed for use with personal computers and other equipment running on 3.3V power rails. This application note covers the application field and working principle of the LM4132EMF-3.3.

Application Field

The LM4132EMF-3.3 is a voltage reference IC designed for use in portable electronics and personal computers. This IC provides precise output voltage and current setting, making it suitable for any application requiring accurate voltage and current regulation. The device also provides low-dropout operation, even when the input voltage varies widely. This allows the device to be used in a wide range of applications, such as device power supplies, battery-backed reference sources, and voltage clamping applications.

The IC also has other features such as protection circuitry, an internal overvoltage crowbar protection, an output current limit, and an active-low enable pin. Additionally, the LM4132EMF-3.3 contains a temperature sensor and has a thermal shutdown indication. This makes it suitable for use in devices operating in high temperature environments.

Working Principle

At the heart of the LM4132EMF-3.3 is a high performance voltage reference that provides a precise output voltage regulation and current setting capability. The output voltage is set with an external voltage divider, while the current setting is done with an external series resistor. The voltage reference circuit provides reference voltage sources and will automatically adjust the output voltage to match the input voltage while maintaining the current output level.

The integrated active-low enable pin can be used to turn off the output voltage completely, or can be used to control the power-down operation of the IC. When the enable pin is low, the output voltage is off and the current limit feature is disabled. This allows the IC to be used in applications where the output voltage needs to be disabled quickly.

The integrated protection circuitry ensures that the output voltage is always maintained within its safe operating range. The protection circuit monitors the voltage at the output and will shut off the output voltage if it exceeds the maximum regulated voltage. The internal overvoltage crowbar protection will also activate if the output voltage exceeds its regulated level. This protection keeps the output voltage from fluctuating beyond its optimum range.

The LM4132EMF-3.3 also contains a temperature sensor. The temperature sensor signals an active-low thermal warning which can be used to signal the user that the IC is getting too hot to operate safely. Additionally, this temperature sensor can be used to automatically shut down the device if the temperature exceeds its operating range.

Conclusion

The LM4132EMF-3.3 is a voltage reference IC specifically designed for use with personal computers and other equipment running on 3.3V power rails. This device offers high performance voltage and current regulation, low-dropout operation, and integrated protection features. The LM4132EMF-3.3 is ideal for use in a variety of applications, such as device power supplies, battery-backed reference sources, and voltage clamping applications.

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