MAX6191BESA+

Overview

The MAX6191BESA+ is a precision, micropower, low-dropout 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 ±2mV 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 a dropout voltage of 100mV at the maximum load current. The component is housed in an 8-pin SO package and functions reliably across a temperature range of -40°C to +85°C.

Feature Summary

• Utilizes proprietary curvature-correction circuitry and laser-trimmed thin-film resistors for high precision.
• Offers virtually input-voltage-immune supply current to maximize efficiency in battery-powered systems.
• Internally compensated for fast settling times and stable operation with capacitive loads up to 2.2nF.

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 that the ordering suffix matches the required specifications, as variations exist within the MAX6191 family regarding accuracy grades (e.g., B vs A). Confirm the package type corresponds to the design footprint requirements. Ensure the manufacturer designation aligns with the intended supply chain, noting the transition from Maxim Integrated to Analog Devices Inc. Check RoHS compliance status if environmental regulations apply to the specific procurement batch.

Selection Notes

Select this component when a fixed 2.048V reference with tight initial accuracy is required without external trimming. Consider the 35µA quiescent current limit for power-sensitive designs. Evaluate the 500µA load capability against the application's sourcing and sinking needs. Verify that the 2.5V minimum supply voltage meets the system's headroom requirements relative to the 2.048V output.

Part Context

This part belongs to the MAX6190–MAX6195/MAX6198 family of precision bandgap references. These devices share common architectural features, including micropower consumption and low-dropout characteristics. The MAX6191 specifically targets applications requiring the 2.048V standard level often used in data converter interfaces. The family utilizes BiCMOS process technology to achieve the specified performance metrics.

Replacement Considerations

Substitutes must match the 2.048V output voltage and 8-pin SO package. Verify that alternative components offer comparable initial accuracy and temperature coefficients. Ensure the replacement supports the required 500µA load current and operates within the same supply voltage and temperature ranges.