UC39431NG4

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Power management integrated circuits (PMICs) are used to manage an electronic system’s power consumption by controlling the power supply voltages. Voltage reference PMIC designs are used to provide an accurate output voltage reference within an integrated circuit (IC). In these designs, a reference voltage is applied to a transconductance amplifier, with the output current proportional to the controlled voltage. The UC39431NG4 voltage reference is a widely used PMIC that combines the reference voltage with a voltage detection circuit to accurately monitor and adjust the output reference voltage.The UC39431NG4 operates in two modes: high gain gain and low gain. In high gain mode, it can produce a reference voltage from 0.7V to 1.8V and in low gain mode, it can produce reference voltages ranging from 1.4V to 3.2V. The voltage detection circuit monitors the output voltage and adjusts it accordingly, to ensure the accuracy of the reference voltage. The UC39431NG4 also contains an open drain output that can be used to connect to external components like transistors or switches for controlling power or voltage.The UC39431NG4 also provides many protection features. Its overvoltage protection prevents the output voltage from exceeding the set threshold and its undervoltage protection ensures that the supplied voltage is sufficiently steady. The circuit also contains temperature-compensated sensitivity ramping, which adjusts the reference voltage output to compensate for changes in temperature. This ensures that the output voltage is maintained within the specified range and is highly resistant to variations in temperature.The UC39431NG4’s output voltage can be monitored through a 10-bit DAC and it features a low power mode, which reduces the circuit’s power consumption by 70%. The circuit also enables a range of programming functions, giving users the option to customize their application with specific parameters. Overall, the UC39431NG4 is a versatile, high-precision voltage reference circuit with many applications, ranging from power management to analog control functions.

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