MAX6428ORUR+

Overview

The MAX6428ORUR+ is a low-power, single-level battery monitor housed in a 3-pin SOT-23 package. It monitors supply voltages and asserts an output when the voltage drops below a specified threshold. The device features internal hysteresis to prevent output chatter during voltage transitions near the trip point. A minimum timeout period of 140ms ensures supply voltages stabilize before system activity is enabled. It is designed for monitoring single lithium-ion cells or multicell alkaline/NiCd/NiMH power supplies.

Feature Summary

• Provides low-battery output indication for three battery conditions: good, weak, or empty.
• Features internal hysteresis to ensure stable operation during voltage transitions.
• Includes a minimum 140ms timeout period to allow supply voltage stabilization.

Applications

• Monitoring single lithium-ion (Li+) cells
• Monitoring multicell alkaline power supplies
• Monitoring NiCd/NiMH power supplies

Procurement Notes

Verify the specific datasheet revision and exact threshold voltage for the ORUR suffix variant. Confirm RoHS compliance status as indicated in official documentation. Ensure the application circuit accounts for the 140ms minimum timeout requirement for proper system initialization. Check for any specific handling instructions related to the SOT-23-3 package.

Selection Notes

Select this component for applications requiring simple, low-power battery level monitoring with built-in noise immunity via hysteresis. It is suitable for systems powered by Li+, alkaline, NiCd, or NiMH sources where a single low-battery warning is sufficient. Consider the 140ms delay when designing startup sequences that depend on precise voltage stability detection.

Part Context

This part belongs to the MAX6427–MAX6438 family of single/dual-level battery monitors. These devices are optimized for portable electronics and embedded systems. The MAX6428 specifically offers a single low-battery output indicator, distinguishing it from dual-output variants in the same series.

FAQ

What is the purpose of the internal hysteresis in the MAX6428ORUR+?

Internal hysteresis prevents output chatter by ensuring the output deasserts only when the voltage rises above a higher threshold than the one at which it asserted, providing stable switching near the trip point.

Why is there a minimum 140ms timeout period?

The timeout period ensures that supply voltages have fully stabilized before enabling power-converter or microprocessor activity, preventing premature system activation during transient voltage drops.