MAX6438UT-T

Overview

The MAX6438UT-T is a low-power, dual-level battery monitor with hysteresis from the Analog Devices / Maxim Integrated MAX6427–MAX6438 family. It operates within a supply voltage range of 1 V to 5.5 V and functions across an industrial temperature range of -40°C to +85°C. The device is housed in a compact SOT-23-6 surface-mount package. Designed for single-cell lithium-ion or multicell alkaline/NiCd/NiMH applications, it provides two independent low-battery output indicators to signal normal, low-power, or disabled system states based on factory-trimmed thresholds.

Feature Summary

• Dual low-battery output indicators enable three distinct operational modes: normal operation, low-power mode, and system disablement.
• Internal hysteresis prevents output oscillation during voltage transitions near threshold levels.
• Integrated minimum timeout period ensures supply voltages stabilize before enabling power-converter or microprocessor activity.

Applications

• Single-cell lithium-ion (Li+) battery monitoring
• Multicell alkaline, NiCd, or NiMH power supply supervision
• Portable electronic devices requiring low-power management

Procurement Notes

Verify the exact suffix against official manufacturer documentation, as variations such as RD3, RR, or QV may indicate specific tape-and-reel packaging or environmental compliance grades. Confirm availability status directly with authorized distributors, as this component may be subject to limited supply or special order constraints. Ensure the selected variant matches the required operating temperature and package specifications for your design.

Selection Notes

Select this component when dual-stage battery warning capabilities are required without external components. The MAX6438 offers fixed factory-trimmed thresholds suitable for standard cell chemistries. Compare against the MAX6429 if only a single low-battery indication is sufficient, or consider the MAX6439 series if an integrated microprocessor reset supervisor is also needed alongside battery monitoring.

Part Context

This part belongs to the MAX6427–MAX6438 family of ultra-low-power battery monitors. These devices are designed to replace discrete comparator circuits, reducing board space and component count. The family shares common features like internal hysteresis and timeout periods, differing primarily in the number of low-battery outputs and specific threshold combinations.

Replacement Considerations

The MAX6429 is a compatible single-output alternative within the same family. For designs requiring an integrated microprocessor reset function, the MAX6439 series serves as a functional upgrade. Verify that any substitute maintains the SOT-23-6 package and meets the 1 V to 5.5 V operating voltage range.