MAX6428MQUR+

Overview

The MAX6428MQUR+ is a low-power, single-output battery monitor IC from Maxim Integrated. It features a factory-trimmed threshold for monitoring single lithium-ion cells or multi-cell alkaline/NiCd/NiMH power supplies. The device asserts a low-battery output when the supply voltage drops below a specified threshold and deasserts it after rising above a higher threshold, following a minimum 140ms timeout to ensure voltage stabilization. It operates in an SOT-23-3 package.

Feature Summary

• Factory-trimmed accuracy for reliable threshold detection without external calibration
• Internal hysteresis prevents output chatter during voltage transitions near thresholds
• Minimum 140ms timeout period ensures supply voltage stability before enabling system activity

Applications

• Monitoring single lithium-ion (Li+) battery cells
• Monitoring multi-cell alkaline, NiCd, or NiMH power supplies
• Indicating three battery conditions: good, weak, or empty

Procurement Notes

Verify the manufacturer marking matches Maxim Integrated or Analog Devices Inc. Confirm the package type is SOT-23-3 and the suffix indicates the + lead-free/RoHS compliant version. Ensure the part number corresponds to the specific threshold voltage required for your application, as this series offers multiple fixed threshold options.

Selection Notes

Select this component when a simple, low-cost solution is needed for basic battery level indication in portable devices. It is suitable for applications where precise fuel gauging is not required, but a clear warning signal for low battery status is necessary to trigger low-power modes or system shutdowns.

Part Context

This part belongs to the MAX6427–MAX6438 family of single/dual-level battery monitors. These devices are designed to provide hardware-based battery status indicators. The MAX6428 specifically refers to one of the single-output variants within this family, distinguished by its specific factory-set trip point voltage.

Replacement Considerations

Compatible substitutes include other parts from the MAX6427–MAX6438 family with matching threshold voltages and single-output configurations. Verify that any replacement maintains the same SOT-23-3 footprint and electrical characteristics regarding hysteresis and timeout behavior.