MAX6429BIUR+T

Overview

The MAX6429BIUR+T is a low-power, single-level battery monitor with internal hysteresis, manufactured by Analog Devices Inc. (Maxim Integrated). It operates within a supply voltage range of 1.0V to 5.5V and features a factory-trimmed low-battery threshold of 2.85V. The device provides an open-drain low-battery output that asserts when the supply voltage drops below the specified threshold. A minimum timeout period of 140ms ensures supply stabilization before deasserting the output as voltage rises above the high threshold. It is housed in a SOT-23-3 package.

Feature Summary

• Integrates internal hysteresis to prevent output chatter during voltage transitions near the threshold.
• Provides a dedicated low-battery indicator output for monitoring single lithium-ion or multicell alkaline/NiCd/NiMH power supplies.
• Includes a guaranteed minimum timeout period to ensure stable supply voltages before enabling system activity.

Applications

• Monitoring single lithium-ion (Li+) cells in portable electronics
• Indicating weak battery conditions in systems powered by multicell alkaline, NiCd, or NiMH batteries
• Triggering low-power modes or system shutdowns in microprocessor-based applications

Procurement Notes

Verify the specific suffix 'I' indicates the factory-trimmed threshold variant (2.85V) and 'U' denotes the SOT-23-3 package. Confirm RoHS compliance status (+ suffix) and lead-free specifications. Ensure the ordering quantity meets manufacturer requirements for non-standard versions if applicable. Cross-reference the datasheet revision to confirm electrical characteristics match the design requirements.

Selection Notes

Select this component when a fixed, factory-trimmed threshold is preferred over user-adjustable options. It is suitable for applications requiring minimal external components and low quiescent current. Consider the SOT-23-3 package size constraints and the open-drain output capability for interfacing with various logic levels. Verify that the 140ms timeout aligns with system startup stability requirements.

Part Context

The MAX6429BIUR+T belongs to the MAX6427–MAX6438 family of low-power battery monitors. This family offers both single and dual-level output configurations. The MAX6429 specifically provides a single low-battery output with a factory-trimmed threshold, distinguishing it from adjustable variants like the MAX6433 series. It shares the same core functionality and package options as other members of this supervisory circuit family.

Replacement Considerations

Compatible substitutes within the same family include MAX6427, MAX6428, MAX6430, MAX6431, and MAX6432, provided their specific factory-trimmed thresholds match the application requirements. Ensure the replacement part maintains the same package type and output configuration (open-drain LBO).