ADR431BRMZ-R7

PMIC - Voltage Reference

The ADR431BRMZ-R7 is a precision bandgap voltage reference from Analog Devices, Inc. It has been designed to provide an absolute accuracy of 0.1% and an initial accuracy of 0.05%, with temperatures ranging from -20 to 70 degrees Celsius. It requires a very low operating current of only 2 microamperes for normal operation, and offers an overall temperature coefficient of 0.5ppm/°C. It also comes with a shutdown control input that can be used to control the output voltage. This makes it a very suitable device for applications where power requirements are critical.

Application Field

The ADR431BRMZ-R7 is a great device for precision voltage reference in power amplifier circuits, power converters, and other low power applications. It can also be used in test instruments, data acquisition systems, and battery management systems. It has been used successfully in the automotive, industrial, and medical device sectors as well. Its stable output and low supply current make it an ideal choice for applications that require precision voltage control.

Working Principle

The ADR431BRMZ-R7 utilizes a band-gap reference circuit to generate a stable reference voltage output. This reference voltage is generated by two separate paths, one of which is composed of a base-emitter diode junction and a resistor, and the other one of a PN junction and a temperature sensor. The outputs of each stage are then combined in a differential amplifier to generate the reference voltage output. This reference voltage is then fed to an amplifier stage where it is adapted to the supply voltage to provide an output voltage that is independent of the supply voltage.

The device also includes a current source to provide bias to the amplifier stage, as well as a temperature-dependent trimming circuitry that allows the reference voltage output to be further adjusted based on temperature fluctuations. This allows the output voltage to remain stable over a range of temperatures.

Conclusion

The ADR431BRMZ-R7 is a great device for providing a precise voltage reference over a wide range of temperatures. Its low supply current and high stability make it ideal for applications where power requirements are critical. It has been widely used in automotive, industrial, and medical device sectors, and has been proven to be reliable and accurate in these settings.