MAX6194AESA+

Overview

The MAX6194AESA+ is a precision, micropower, low-dropout voltage reference from the MAX6190–MAX6195/MAX6198 series. 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 supports source and sink currents up to 500µA with guaranteed load regulation. 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.
• Series-mode architecture ensures supply current remains virtually independent of input voltage variations.
• Internally compensated design allows stability with capacitive loads up to 2.2nF without 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 'A' indicates the required ±5mV initial accuracy grade and 'ESA+' confirms the lead-free/RoHS-compliant 8-pin SO package. Confirm the manufacturer designation matches Analog Devices Inc./Maxim Integrated specifications. Ensure the operating environment stays within the specified -40°C to +85°C temperature range for guaranteed performance parameters.

Selection Notes

Select this component when a stable 4.5V reference is needed with minimal power consumption. The low dropout characteristic makes it suitable for battery-powered applications where input voltage may approach the output level. Verify that the load requirements do not exceed the 500µA sourcing or sinking limits to maintain specified line and load regulation performance.

Part Context

This part belongs to the MAX6190 family of precision bandgap references. The family shares common features such as micropower operation and low dropout capabilities but varies by output voltage and accuracy grades. The MAX6194 specifically targets the 4.5V output requirement, distinguishing it from adjacent voltages like 4.096V (MAX6198) or 5.0V (MAX6195).

Replacement Considerations

Other members of the MAX6190–MAX6195/MAX6198 series share identical pinouts and package dimensions. Substitution requires matching the exact output voltage and accuracy grade. For example, MAX6194BESA+ offers tighter accuracy, while MAX6194CESA+ offers looser tolerance.

FAQ

Does the MAX6194AESA+ require an external capacitor for stability?

No, the device is internally compensated and stable with capacitive loads ranging from 0 to 2.2nF. An external capacitor is optional and primarily used to reduce overshoot during transient load changes.

How does the supply current behave under varying input voltages?

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