MAX6191AESA+

Overview

The MAX6191AESA+ is a precision, micropower, low-dropout voltage reference from the MAX6190–MAX6195/MAX6198 family. It provides a fixed output voltage of 2.048V with an initial accuracy of ±5mV and a maximum temperature coefficient of 5ppm/°C. The device draws a maximum quiescent supply current of 35µA and supports source and sink currents up to 500µA. It operates within a supply voltage range of 2.5V to 12.6V and features capacitive-load stability for loads up to 2.2nF.

Feature Summary

• Utilizes proprietary curvature-correction circuitry and laser-trimmed thin-film resistors to achieve high initial accuracy and low temperature drift.
• Series-mode architecture ensures supply current remains virtually independent of input voltage variations, maximizing efficiency in battery-powered applications.
• Internally compensated design allows for fast settling times and stable operation with capacitive loads up to 2.2nF without requiring external compensation components.

Applications

• Hand-Held Instruments
• Analog-to-Digital and Digital-to-Analog Converters
• Industrial Process Control
• Precision 3V/5V Systems
• Hard-Disk Drives

Procurement Notes

Verify the specific suffix 'A' corresponds to the required ±5mV initial accuracy grade when ordering. Confirm that the 'ES' package code matches the SO-8 footprint requirements for your PCB layout. Ensure the '+' suffix indicates lead-free/RoHS compliance if environmental regulations apply to your manufacturing process. Cross-reference the datasheet revision history for any updates to electrical characteristics or pin configurations before finalizing procurement specifications.

Selection Notes

Select this component when a fixed 2.048V reference is needed with strict limits on temperature drift and initial accuracy. Consider the MAX6191AESA+ over shunt references for improved power efficiency in battery-operated systems due to its series-mode topology. Evaluate the 35µA quiescent current against system power budgets. Verify that the 500µA load capability meets the drive requirements of downstream ADCs or DACs without exceeding the dropout voltage limits at minimum input voltages.

Part Context

This part belongs to the MAX6190–MAX6195/MAX6198 family of precision voltage references manufactured by Analog Devices / Maxim Integrated. The family shares common architectural features including micropower consumption and low-dropout performance. Variants within the family differ primarily in their fixed output voltage levels (ranging from 1.25V to 5.0V) and initial accuracy grades (A, B, C). The MAX6191 specifically targets the 2.048V output requirement.

Replacement Considerations

Direct functional substitutes within the same family include MAX6191BESA+ (±2mV accuracy) and MAX6191CESA+ (±10mV accuracy), provided the accuracy tolerance aligns with design requirements. Other parts in the MAX6190 series may serve as alternatives if different output voltages are acceptable.