MAX6429EIUR+T

Overview

The MAX6429EIUR+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 1V to 6V and draws a typical quiescent current of 1µA. The device features a factory-trimmed low-battery output (LBO) threshold of 2.85V with a corresponding high threshold of 3.15V. It provides a guaranteed valid LBO logic state down to a supply voltage of 1.0V and includes a minimum timeout period of 140ms for output deassertion. The component is housed in a compact SOT-23-3 surface-mount package.

Feature Summary

• Integrates internal hysteresis to prevent output chatter during voltage transitions
• Provides a push-pull low-battery output indicator for system status signaling
• Ensures stable operation with a minimum timeout period before re-enabling power-converter activity
• Maintains valid logic states even at the lowest operating supply voltage

Applications

• Monitoring single lithium-ion cells for low-battery indication
• Monitoring multicell alkaline or NiMH power supplies
• Signaling microprocessors to switch to low-power modes
• Enabling system disable functions when battery capacity is depleted

Procurement Notes

Verify the specific suffix 'E' corresponds to the required 2.85V/3.15V threshold configuration as defined in the official datasheet tables. Confirm that the '+T' designation indicates tape-and-reel packaging compatible with automated assembly processes. Ensure the ordering quantity meets the manufacturer's standard increment requirements for this specific threshold variant.

Selection Notes

Select this component when a fixed, factory-trimmed low-battery threshold is preferred over user-adjustable options. It is suitable for designs requiring minimal external components and precise voltage monitoring without calibration. Consider the SOT-23-3 package size constraints and the 1µA quiescent current requirement for battery-powered applications.

Part Context

This part belongs to the MAX6427–MAX6438 family of low-power battery monitors. Unlike adjustable variants in the same series, this model utilizes fixed thresholds determined by the 'E' suffix. It shares common family features such as internal hysteresis and low quiescent current but differs in its inability to modify trip points via external resistors.

Replacement Considerations

Direct pin-compatible replacements within the same family include other MAX642x models with different threshold suffixes. Verify that alternative parts match the required 2.85V low threshold and 3.15V high threshold specifications to maintain system timing and detection accuracy.