MAX6021BEUR-T

Overview

The MAX6021BEUR-T is a precision, low-dropout, micropower series-mode voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed output voltage of 2.048V with an initial accuracy of ±0.39% and a maximum temperature coefficient of 30ppm/°C over the -40°C to +85°C range. The device operates within a supply voltage range of 2.5V to 12.6V, drawing a quiescent current of 35μA maximum. It supports sourcing and sinking up to 500μA of load current with a dropout voltage of 200mV at full load. Packaged in a compact SOT-23-3 surface-mount format, it eliminates the need for external compensation capacitors.

Feature Summary

• Proprietary curvature-correction circuit combined with laser-trimmed thin-film resistors ensures high precision and stability across temperature variations.
• Series-mode architecture delivers supply current virtually independent of input voltage, maximizing efficiency compared to shunt references.
• Internally compensated design remains stable with capacitive loads ranging from 0 to 2.2nF without requiring external components.

Applications

• Hand-Held Equipment
• Data Acquisition Systems
• Industrial and Process-Control Systems
• Battery-Operated Equipment
• Hard-Disk Drives

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when ordering. Confirm RoHS compliance status via official documentation as markings may vary. Ensure the supplier source is authorized to guarantee authenticity. Check for any recent product change notices or lifecycle updates directly from Analog Devices before finalizing procurement plans.

Selection Notes

Select this component for applications requiring a precise 2.048V reference in space-constrained designs. It is suitable for battery-powered systems due to its ultra-low quiescent current and independence from supply voltage fluctuations. Consider the ±0.39% accuracy and 30ppm/°C drift limits against system requirements. Verify that the 500μA source/sink capability meets the load demands of the downstream circuitry.

Part Context

This part belongs to the MAX6012/MAX6021/MAX6025/MAX6030/MAX6041/MAX6045/MAX6050 family of precision voltage references. All members share identical pinouts, package types, and core architectural features, differing primarily in their fixed output voltages. The MAX6021 specifically targets the 2.048V requirement common in ADC/DAC reference applications.

Replacement Considerations

Direct functional replacements within the same family include MAX6021AEUR+T (±0.24% accuracy) or MAX6021BEUR+ (non-tape version). Cross-family alternatives like MAX6062 or MAX6010 offer different voltages or performance profiles but require schematic review.

FAQ

Does the MAX6021 require an external capacitor for stability?

No, the device is internally compensated and stable with capacitive loads from 0 to 2.2nF. An external capacitor is optional and only recommended to improve transient response under step-load conditions.

How does the supply current behave relative to input voltage?

The quiescent supply current is virtually independent of the supply voltage, varying by only 0.8μA/V across the operating range. This contrasts with shunt references where current increases with input voltage.