LM285DE4-1-2

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PMIC (Power Management Integrated Circuit) Voltage Reference used in DC-DC converters has largely replaced linear voltage regulators. Novel voltage references such as the LM285DE4-1-2 are becoming popular due to their superior accuracy and good noise characteristics. This article explains the application field and working principle of the LM285DE4-1-2.

What is the LM285DE4-1-2?

The LM285DE4-1-2 is a voltage reference device designed for voltage step-down power supplies. It consists of a voltage error amplifier and an adjustable precision bandgap reference. The reference voltage output is temperature-stable, having a low temperature coefficient of only 25 ppm/°C. With an operating voltage range from 1.8 to 5.5 V, the LM285DE4-1-2 is ideal for a variety of power supply topologies, including switch-mode and linear applications.

Application Fields of the LM285DE4-1-2

The LM285DE4-1-2 has a wide variety of applications in power management and voltage regulation circuits. It provides a reliable voltage reference for voltage regulators, battery chargers, and other DC-DC converter circuits. It can also be used to design digitally controlled switching power supplies and DC-DC converters with enhanced accuracy.In high-power applications, the LM285DE4-1-2 can be used to provide an ultra-stable output reference, which can help reduce the ripple of the output current, resulting in better efficiency and increased design flexibility.The device is also suitable for an array of voltage monitoring circuits and is often used for low-power or low-voltage applications, such as digital power supply circuits, voltage regulators, and adjustable current sources.

Working Principle of the LM285DE4-1-2

The LM285DE4-1-2 works by providing a known, stable output voltage of 5 V, independent of temperature and load current. This is done by monitoring the supply voltage and continuously adjusting the internal reference to maintain a fixed output voltage.It uses a feedback loop to compare the voltage being supplied to the circuit with the reference voltage being output. If the reference voltage is too low, a signal is sent to the error amplifier, which adjusts the output current of the device until the reference voltage is equal to the input voltage. By doing this, the LM285DE4-1-2 provides a very accurate and stable voltage reference.

Conclusion

The LM285DE4-1-2 voltage reference is a novel device for power management circuits. It provides an ultra-stable reference voltage, which makes it ideal for a variety of power supply topologies, including switch-mode and linear applications. Its feedback loop ensures that a precise and accurate output voltage is maintained, independent of temperature and load current. This makes it an invaluable tool for digital power supplies, voltage regulators, and adjustable current sources.

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