MAX6191CESA+

Overview

The MAX6191CESA+ is a precision, micropower, low-dropout voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed output voltage of 2.048V with an initial accuracy of ±10mV and a maximum temperature coefficient of 25ppm/°C. The device operates within a supply voltage range of 2.5V to 12.6V, drawing a maximum quiescent supply current of 35µA. It features a dropout voltage of up to 200mV at a 500µA load current and supports capacitive loads from 0nF to 2.2nF without external compensation.

Feature Summary

• Proprietary curvature-correction circuit combined with laser-trimmed thin-film resistors ensures high initial accuracy and very low temperature drift across the operating range.
• Micropower series-mode architecture draws minimal quiescent current that remains virtually independent of input voltage variations, maximizing efficiency in battery-powered applications.
• Low-dropout design allows sourcing and sinking currents up to 500µA while maintaining regulation with minimal headroom requirements.
• Internal frequency compensation guarantees stability with capacitive loads ranging from 0nF to 2.2nF, eliminating the need for external stabilization 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 'CESA+' corresponds to the required accuracy grade (±10mV) and package type (8-SOIC). Confirm the operating temperature range matches the application environment (-40°C to +85°C). Ensure the input supply voltage stays within the specified 2.5V to 12.6V limits to maintain guaranteed line regulation and avoid excessive power dissipation.

Selection Notes

Select this component when a stable 2.048V reference is needed with moderate precision requirements. It is suitable for designs where board space is limited due to internal compensation allowing zero output capacitance. Consider the 35µA quiescent current for battery life calculations and ensure the load current does not exceed the 500µA sourcing/sinking capability to prevent dropout or instability.

Part Context

This part belongs to the MAX6190–MAX6195/MAX6198 family of precision voltage references. These devices share a common architecture utilizing BiCMOS process technology and proprietary curvature correction. The family offers various fixed output voltages and accuracy grades, all packaged in compact 8-pin SOIC formats for surface-mount integration.

Replacement Considerations

Direct substitutes within the same family include MAX6191AESA+ (±2mV accuracy) and MAX6191BESA+ (±5mV accuracy), which offer tighter tolerances but may have different cost implications. Other family members like MAX6190 or MAX6192 provide different output voltages but share similar electrical characteristics and pinouts.