MAX6190BESA+T

Introduction of MAX6190BESA+T

The MAX6190BESA+T is a precision micropower voltage reference which combines the exceptional performance of the long-term stability and low temperature coefficient of bandgap references with an ultralow supply current of 65μA. It also draws a constant supply current of 65μA over a 2V to 5.5V supply voltage range, and offers a wide output voltage range from 2.0V to 3.2V. This combination of features makes the MAX6190BESA+T ideal for battery-powered systems and applications in the industrial, consumer, and automotive markets.

Application Field

The MAX6190BESA+T is suitable for precise voltage reference applications such as portable instrumentation, automotive, communication systems, medical equipment, etc. It is also ideal for portable instrumentation and process control, such as in portable laboratory equipment, where fast settling time is needed, or for battery-powered applications where low power dissipation is a priority. Furthermore, the device is suitable for fast switching applications, such as Li-ion battery charge-discharge loop, where a precise voltage reference is necessary to accurately predict the state of charge.

Working Principle

The MAX6190BESA+T is a Bandgap voltage reference, which works by harnessing the effect of a temperature-dependent voltage offset between two transistors, to create a stabilized and accurate reference voltage. This effect is achieved by connecting the emitter-base junction of a PNP transistor to the emitter-base junction of an NPN transistor, linked in a feedback loop. The differential input voltages of the two types of transistors differ only marginally with temperature changes and thus the voltage at their junction remains stable over the temperature range.

The MAX6190BESA+T comprises two separate bandgap reference designs, either of which can be independently selected and enabled. Each reference has its own amplifier and current mirrors for output buffering. The device is powered from a single supply voltage and has a wide output voltage range. In addition, the device offers additional features such as slew rate control, adjustable reference voltage, and an open-drain push-pull driver mode.

Conclusion

The MAX6190BESA+T combines the excellent performance of a bandgap reference with low power consumption, a wide output voltage range, and excellent temperature stability, making it the perfect choice for precise voltage reference applications. The device is suitable for battery-powered systems, fast switching applications, and even industrial and automotive markets, due to its wide supply voltage range.