MAX6143BASA33

Overview

The MAX6143BASA33 is a high-precision, low-noise series voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed output voltage of 3.3V with an initial accuracy of ±0.05% and a maximum temperature coefficient of 3ppm/°C. The device operates within an input voltage range from VOUT + 2V up to +40V and draws a typical supply current of 340µA. It features a dedicated temperature sensor output (TEMP) and a trimming input (TRIM). The component supports sourcing up to 30mA or sinking 2mA of load current and includes an active-low shutdown feature that reduces current consumption to 0.01µA. It is housed in an 8-pin SO package and operates over the -40°C to +125°C automotive temperature range.

Feature Summary

• Proprietary curvature-correction circuit and laser-trimmed thin-film resistors ensure excellent temperature stability and precision.
• Integrated temperature sensor output allows for direct die temperature monitoring applications.
• Capable of driving capacitive loads up to 100µF without requiring an external output bypass capacitor for stability.
• Active-low shutdown pin significantly reduces power consumption when the device is not in use.

Applications

• High-resolution analog-to-digital converter (ADC) references
• Digital-to-analog converter (DAC) references
• Precision regulators
• Temperature sensing systems

Procurement Notes

Verify the specific suffix 'B' indicates the required accuracy grade and 'SA' denotes the SOIC-8 package variant. Confirm the '33' suffix corresponds to the 3.3V fixed output version. Ensure compatibility with the -40°C to +125°C operating range if used in automotive environments. Cross-reference the datasheet revision to confirm pinout consistency with existing designs.

Selection Notes

Select this component when system requirements demand low noise and high initial accuracy without the need for external output capacitors. The integrated temperature sensor makes it suitable for applications requiring simultaneous voltage referencing and thermal monitoring. Consider the 340µA quiescent current for battery-powered designs, utilizing the shutdown feature to minimize standby drain.

Part Context

The MAX6143 belongs to a family of high-precision voltage references designed for demanding signal chain applications. Unlike shunt references, this series-mode device offers superior line regulation and lower power consumption. The inclusion of a trim input allows for fine-tuning the output voltage to meet tight system tolerances, distinguishing it from standard fixed references.

Replacement Considerations

Direct substitutes include other MAX6143 variants with different output voltages (e.g., MAX6143BASA25, MAX6143BASA50) if the voltage level can be adjusted via the TRIM pin or if the system design permits. Verify that alternative packages maintain the same thermal and electrical characteristics.

FAQ

Does the MAX6143BASA33 require an output bypass capacitor?

No, the device does not require an output bypass capacitor for stability and is stable with capacitive loads up to 100µF.

What is the function of the TEMP pin?

The TEMP pin provides an output voltage that is proportional to the die temperature, enabling temperature-sensing applications.

How does the shutdown feature affect power consumption?

Activating the active-low shutdown (SHDN) pin reduces the supply current to 0.01µA.