LP2989IMX-5.0

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LP2989IMX-5.0: Application Field and Working Principle

LP2989IMX-5.0 is a low-power, low-dropout linear voltage regulator from Texas Instruments. It is designed to provide a high-performance, low-ripple, low-noise 5.0V supply in applications with limited space. The integrated circuit is built using advanced process technology and can operate over an extended temperature range while consuming only 20μA of quiescent current.

LP2989IMX-5.0 is a part of Texas Instruments\' Power Management and Interface (PMIC) portfolio and falls under the category of Voltage Regulators - Linear. It features an adjustable device current limit to protect against possible over-current conditions. Additionally, the device includes an enable pin that allows the user to switch the regulator output off and on again without exceeding the maximum operating temperature. The enable function also reduces the quiescent current to less than 0.1μA.

Application Field

LP2989IMX-5.0 is designed to provide a 5.0V output rail for low-power applications such as handheld devices, portable electronics, industrial control systems, smart energy meters and medical applications. It is also suited for other low-power applications that require a low-noise, low-dropout regulator.

The typical use-cases of this regulator are in battery-operated devices, as well as applications where the power input may be supplied from a variety of potential sources, such as automotive 12V supplies, low-dropout regulators and more.

Working Principle

The LP2989IMX-5.0 voltage regulator works based on the principle of linear voltage regulation. It uses an external feedback resistor divider to set the output voltage level, while an internal feedback circuit puts out a reference voltage in order to maintain the output voltage constant.

To maintain its output voltage, the regulator periodically monitors the output voltage level and adjusts its output current appropriately. When the output voltage falls below the reference voltage level, the regulator increase the output current in order to compensate for the voltage drop. Similarly, when the output voltage exceeds the reference level, the regulator reduces the output current in order to reduce the excess voltage.

The LP2989IMX-5.0 includes an adjustable device current limit to protect against over-current conditions. This current limit feature can be adjusted using an external resistor divider connected to the current-limit pin. The current limit can be set to any value between 1.3mA and 500mA.

In applications where the ambient temperature is likely to exceed the maximum operating temperature of the LP2989IMX-5.0, an external heatsink may be required. In addition, a low-impedance, ceramic bypass capacitor must be connected between the input and output pins of the device to reduce voltage drops.

Finally, the device includes an enable pin that allows the user to switch the regulator output off and on again without exceeding the maximum operating temperature. This can be especially useful in applications that require a low-power shutdown mode.

Conclusion

The LP2989IMX-5.0 is a low-power, low-dropout linear voltage regulator from Texas Instruments. It can provide a 5.0V output rail for low-power applications such as handheld devices, portable electronics, industrial control systems, smart energy meters and medical applications. The device works based on the principle of linear voltage regulation and includes an adjustable device current limit and an enable pin to control its output.

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