MAX6194BESA+

Overview

The MAX6194BESA+ is a precision, micropower, low-dropout series-mode voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed output voltage of 4.5V with an initial accuracy of ±5mV and a maximum temperature coefficient of 5ppm/°C. The device operates within a supply voltage range of 4.7V to 12.6V and draws a maximum quiescent supply current of 35µA. It features internal compensation for fast settling times and remains stable with capacitive loads up to 2.2nF. The component supports sourcing and sinking currents up to 500µA while maintaining specified load regulation.

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 and stability with capacitive loads ranging from 0 to 2.2nF without requiring external 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 'ES' corresponds to the standard SO-8 package and '+E' indicates lead-free/RoHS compliance as per the manufacturer's ordering guide. Confirm that the input voltage source can provide transient currents exceeding nominal levels during turn-on to ensure reliable operation. Check for automotive grade variants if operating conditions require extended qualification beyond the standard industrial temperature range specifications.

Selection Notes

Select this component when a fixed 4.5V reference is required with minimal power consumption and high precision. The series-mode topology is preferred over shunt references for applications where supply current must not vary with input voltage or where load current is intermittent. Ensure the input voltage stays above the dropout threshold relative to the 4.5V output to maintain regulation under maximum load conditions.

Part Context

This part belongs to the MAX6190–MAX6195/MAX6198 family of precision voltage references. The family shares common architectural features including micropower operation, low dropout characteristics, and internal compensation. Variants within the series differ primarily in their fixed output voltage levels, ranging from 1.25V to 5.0V, allowing designers to choose the appropriate reference level while maintaining consistent performance metrics across the product line.

Replacement Considerations

Other members of the MAX619x family (e.g., MAX6194AESA+, MAX6194CESA+) offer different initial accuracy grades but share the same pinout and functionality. Cross-referencing with other Maxim Integrated series-mode references requires verifying output voltage compatibility and ensuring equivalent thermal and electrical performance characteristics are met.

FAQ

Does the MAX6194BESA+ 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 primarily used to reduce overshoot or undershoot during load transients.

How does the supply current behave with respect to input voltage changes?

The quiescent supply current is virtually immune to input voltage variations, changing by only 0.8µA/V across the specified input voltage range. This contrasts with shunt-mode references where current varies directly with input voltage.