MAX6429FHUR+T

Overview

The MAX6429FHUR+T is a low-power, single-level battery monitor from the MAX6427–MAX6438 family. It operates within a supply voltage range of 1.6 V to 5.5 V and features an internal hysteresis mechanism to prevent output chatter during voltage transitions. 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 140 ms timeout period. This delay ensures supply voltage stabilization before enabling power-converter or microprocessor activity. Packaged in a compact SOT-23-3 surface-mount case, it supports operation across temperatures from -40°C to +85°C.

Feature Summary

• Provides single-level low-battery indication with internal hysteresis for stable switching
• Includes a minimum 140 ms timeout period to ensure supply voltage stabilization before system enablement
• Operates efficiently within a wide supply voltage range of 1.6 V to 5.5 V

Applications

• Monitoring single lithium-ion (Li+) cells
• Monitoring multicell alkaline, NiCd, or NiMH power supplies
• Indicating battery conditions such as good, weak, or empty states in portable systems

Procurement Notes

Verify component authenticity through authorized distributors due to discontinuation status. Confirm RoHS compliance and package integrity upon receipt. Cross-reference datasheet revisions to ensure functional compatibility with existing designs. Check for alternative sources if original manufacturing supply is limited.

Selection Notes

Select this component for applications requiring simple, low-cost battery monitoring with minimal external components. The fixed threshold options within the MAX6427–MAX6438 family allow selection based on specific battery chemistry requirements. Ensure the SOT-23-3 package fits the board layout constraints and that the operating temperature range meets environmental specifications.

Part Context

The MAX6429FHUR+T belongs to the MAX6427–MAX6438 series of battery monitors manufactured by Analog Devices Inc./Maxim Integrated. These devices are designed for portable electronics where power management efficiency is critical. The series offers both single and dual-level output configurations to support various battery state indications.

Replacement Considerations

Check for direct substitutes within the MAX6427–MAX6438 family, such as MAX6427 or MAX6428, which share similar functionality but may have different threshold voltages. Verify pinout compatibility and electrical characteristics before substitution.