MAX6429DHUR-T

Overview

The MAX6429DHUR-T is a low-power, single-level battery monitor with internal hysteresis, designed for monitoring single lithium-ion cells or multicell alkaline/NiCd/NiMH power supplies. It features factory-trimmed thresholds and operates over a temperature range of -40°C to +85°C. The device provides a push-pull low-battery output that asserts when the supply voltage drops below the specified low threshold and deasserts after rising above the high threshold following a minimum 140ms timeout period. Packaged in a compact SOT-23-3 surface-mount case, it draws typical current of 1µA.

Feature Summary

• Factory-trimmed low and high thresholds ensure precise monitoring without external components
• Internal hysteresis and 140ms minimum timeout prevent false triggering during voltage stabilization
• Low quiescent current consumption extends battery life in portable applications
• Guaranteed valid logic state down to 1.0V input voltage

Applications

• Single-cell lithium-ion battery monitoring
• Multicell alkaline, NiCd, or NiMH power supply supervision
• Portable electronic devices requiring low-power battery status indication
• Systems needing reliable low-battery warnings before shutdown

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package type matches SOT-23-3 and operating temperature range covers -40°C to +85°C. Check for RoHS compliance and lead-free status as indicated by the '+' suffix. Ensure ordering documentation specifies the correct threshold variant if applicable, though this specific part number indicates a fixed factory-trimmed version.

Selection Notes

Select this component when a fixed, factory-calibrated low-battery threshold is required for single-cell applications. It is suitable for designs prioritizing minimal external component count and low standby current. Consider alternative variants within the MAX6427–MAX6438 family if user-adjustable thresholds or dual-output indicators are needed instead of the single-level configuration provided here.

Part Context

This device belongs to the MAX6427–MAX6438 family of single/dual-level battery monitors from Maxim Integrated (now Analog Devices). These ICs are engineered for portable electronics, offering either factory-trimmed or user-adjustable thresholds. The family supports various battery chemistries and provides robust low-battery detection with built-in noise immunity via hysteresis and timeout features.

Replacement Considerations

Direct pin-compatible substitutes include other members of the MAX6427–MAX6438 series with matching threshold specifications. Verify electrical parameters such as threshold voltage and quiescent current before substitution. Note that some variants offer dual outputs or adjustable thresholds, which may require circuit modifications if functionally different.

FAQ

What is the purpose of the 140ms timeout period?

The 140ms minimum timeout ensures that supply voltages have stabilized before enabling power-converter or microprocessor activity, preventing premature system restarts due to transient voltage dips.

Can the MAX6429DHUR-T monitor multiple battery cells?

Yes, while optimized for single lithium-ion cells, it can also monitor multicell alkaline, NiCd, or NiMH power supplies as long as the total voltage falls within its operational range.

How does internal hysteresis benefit the circuit?

Internal hysteresis prevents output chatter or rapid toggling near the threshold voltage by creating a gap between the low and high trip points, ensuring stable operation in noisy environments.