MAX6429EJUR+T

Overview

The MAX6429EJUR+T is a low-power, single-level battery monitor with internal hysteresis from the MAX6427–MAX6438 family. It features factory-trimmed thresholds and operates in a 3-pin SOT-23 package. The device monitors supply voltage to indicate battery conditions: good, weak, or empty. When voltage drops below the low threshold, the output asserts; it deasserts after rising above the high threshold following a minimum 140ms timeout. This ensures supply stabilization before enabling power-converter or microprocessor activity.

Feature Summary

• Provides single low-battery output indication for three distinct battery states
• Includes internal hysteresis to prevent output chatter during voltage transitions
• Features a guaranteed valid logic state down to 1.0V supply voltage
• Offers a minimum 140ms timeout period to ensure voltage stabilization

Applications

• Monitoring single lithium-ion cells
• Monitoring multicell alkaline power supplies
• Monitoring NiCd/NiMH power supplies
• Indicating system mode changes based on battery health

Procurement Notes

Verify the specific suffix 'E' corresponds to the required factory-trimmed threshold voltage range (1.6V to 2.1V or 2.6V to 3.1V) as defined in the official datasheet tables. Confirm the '+T' indicates tape-and-reel packaging if automated assembly is required. Ensure the component meets RoHS compliance standards by checking the manufacturer's certification documentation for this specific part number.

Selection Notes

Select this component when a fixed, factory-calibrated threshold is preferred over user-adjustable options. It is suitable for applications requiring minimal external components and low quiescent current. Consider the MAX6433–MAX6438 series if adjustable thresholds are necessary instead of the fixed options provided by the MAX6427–MAX6432 family.

Part Context

This part belongs to the MAX6427–MAX6438 family of battery monitors manufactured by Maxim Integrated, now part of Analog Devices. The family includes both single-output and dual-output variants. The MAX6429 specifically offers a single low-battery output indicator, distinguishing it from dual-output models like the MAX6430. These devices are designed for portable electronics requiring efficient power management.

FAQ

What determines the assertion and deassertion of the low-battery output?

The output asserts when the supply voltage drops below the specified low threshold. It deasserts only after the voltage rises above the specified high threshold and the minimum 140ms timeout period has elapsed.

Can the threshold voltage be adjusted by the user?

No, the MAX6429 features factory-trimmed thresholds. User-adjustable thresholds are available in the MAX6433–MAX6438 sub-family within the same product line.