MAX6429LRUR+T

Overview

The MAX6429LRUR+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 operates within a supply voltage range of 1.6 V to 5.5 V and features a push-pull low-battery output (LBO). The device asserts the LBO when the supply voltage drops below the specified low threshold and deasserts it when the voltage rises above the high threshold following a minimum 140 ms timeout period. This timeout ensures supply voltages stabilize before enabling power-converter or microprocessor activity. The component is housed in an SOT-23-3 package and is rated for operation from -40°C to +85°C.

Feature Summary

• Provides a single low-battery output indicator to signal three distinct battery conditions: good, weak, or empty.
• Includes internal hysteresis and a guaranteed 140 ms minimum timeout period to ensure stable logic states after voltage recovery.
• Operates with ultra-low current consumption, making it suitable for battery-powered applications requiring extended standby times.

Applications

• Monitoring single lithium-ion (Li+) battery cells
• Monitoring multicell alkaline, NiCd, or NiMH power supplies
• Indicating battery status for systems operating in normal, low-power, or disabled modes

Procurement Notes

Verify the specific suffix 'L' against official Analog Devices documentation to confirm the exact factory-trimmed threshold voltage, as this character defines the operational parameters. Confirm RoHS compliance status through the manufacturer's latest datasheet revision. Check for end-of-life notifications or discontinuation notices, as availability may be limited. Ensure the SOT-23-3 package footprint matches your PCB design requirements. Validate that the input voltage range aligns with your system's maximum supply voltage to prevent damage.

Selection Notes

Select the MAX6429LRUR+T when a single low-battery warning is sufficient for system management. Choose this part over dual-output variants if only one threshold level is needed. Consider the SOT-23-3 package size constraints. Verify that the 140 ms timeout meets your system's startup stability requirements. Compare current consumption against other battery monitors if ultra-low quiescent current is critical. Ensure the threshold voltage matches your battery chemistry's cutoff requirements.

Part Context

The MAX6429 is part of the MAX6427–MAX6438 family of low-power, single/dual-level battery monitors. This family offers both factory-trimmed and user-adjustable threshold options. The MAX6427–MAX6432 sub-series features factory-trimmed thresholds, while the MAX6433–MAX6438 series allows user adjustment via external resistors. All devices in this family share similar low-power characteristics and are available in small SOT-23 and SOT-143 packages, designed for portable electronic applications.

Replacement Considerations

Other members of the MAX6427–MAX6438 family, such as the MAX6427 or MAX6428, may serve as functional replacements if their factory-trimmed thresholds match the required voltage levels. Dual-output variants like the MAX6430 can replace this part if additional monitoring capability is desired, provided pin compatibility is verified. Always consult the official datasheet to confirm electrical parameter equivalence before substitution.