UC39431DTRG4

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PMIC, or Power Management Integrated Circuits, are used to control and maintain the power levels of electrical devices, such as digital and analog circuits. Voltage reference PMICs, such as the UC39431DTRG4, are designed to ensure that a constant voltage is supplied to the device despite fluctuations in input power. The UC39431DTRG4 offers a wide range of features and applications, making it an ideal choice for use in various industries and applications. This article will provide an overview of the UC39431DTRG4, its application field, and its working principle.

UC39431DTRG4 Overview

The UC39431DTRG4, manufactured by Texas Instruments, is a voltage reference PMIC belonging to the family of micropower high performance DC/DC step-down converters. With an ultra-low quiescent current, it draws only 7.2µA in shutdown mode and 4.5mA in 1MHz operation mode. The IC operates from an input voltage ranging from 2.75V to 40V, and support output voltage from 0.5V to 5V, making it an ideal choice for power regulation and management of varying voltage levels.

Application Field

The UC39431DTRG4 is suitable for a range of applications in industries such as aerospace, automotive, and telecommunications. It is mostly utilized in applications where ultra-low quiescent current, low output noise, and a wide operating temperature range are required. This includes cell phone battery chargers, portable medical devices, telemetry systems, automotive systems, battery-powered systems, and signal conditioning systems. It can also be used as an adjustable current limiter in high power systems.

Working Principle

The UC39431DTRG4 works according to the hysteretic bursting step-down topology. This topology utilizes a low quiescent current burst mode converter, which operates by cycling off and on while maintaining a stable output voltage. When the input voltage is greater than the voltage threshold, the burst oscillator operates at its average switching frequency, which is determined by a resistor and a capacitor. The average frequency can then be adjusted by changing the resistor values. When the input voltage is lower than the voltage threshold, the oscillator is disabled, and the device goes into a shutdown mode. This allows the device to maintain a constant output voltage and conserve power.

The UC39431DTRG4 also utilizes a dynamic output discharge function, which helps to reduce output voltage undershoot by discharging the output to the input voltage during shutdown mode. This helps to ensure that the output voltage remains stable and that the device operates within its specified voltage levels.

Conclusion

The UC39431DTRG4 is an ultra-low quiescent current voltage reference PMIC designed for applications where constant and stable output voltage over a wide range of input voltages is required. The device operates according to the hysteretic bursting step-down topology and utilizes a dynamic output discharge function to reduce output voltage undershoot. With its range of features and wide operating temperature range, the UC39431DTRG4 is suitable for a range of industries and applications such as cell phone battery chargers, portable medical devices, etc.

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