MAX6429PSUR+T

Overview

The MAX6429PSUR+T is a low-power, single-level battery monitor with internal hysteresis, manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates within a supply voltage range of 1.6V to 5.5V and features a typical quiescent current of 1µA. The device provides a low-battery output (LBO) that asserts when the supply voltage drops below a specified threshold and deasserts after rising above a high threshold following a minimum 140ms timeout period. This timeout ensures supply stabilization before enabling power-converter or microprocessor activity. The component is housed in an SOT-23-3 package and is designed for monitoring single lithium-ion cells or multicell alkaline/NiCd/NiMH power supplies.

Feature Summary

• Integrates internal hysteresis to prevent output oscillation during voltage transitions near threshold levels.
• Provides a guaranteed valid LBO logic state down to a battery voltage of 1.0V.
• Includes a minimum 140ms timeout period to ensure supply voltage stability before system activation.

Applications

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

Procurement Notes

Verify the specific suffix 'P' against official Maxim Integrated documentation to confirm the exact factory-trimmed threshold voltage level, as this character defines the functional parameter. Ensure the '+T' designation matches the required tape-and-reel packaging configuration for automated assembly processes. Cross-reference the RoHS compliance status with the latest manufacturer release notes to confirm environmental standards.

Selection Notes

Select this component when a fixed, factory-trimmed threshold is preferred over user-adjustable options to simplify design and reduce sensitivity to noise. Consider the SOT-23-3 package size for space-constrained applications. Evaluate the 1µA typical current consumption against system standby requirements. Verify that the 140ms timeout aligns with the startup timing requirements of the downstream microprocessor or power converter.

Part Context

The MAX6429 belongs to the MAX6427–MAX6438 family of single/dual-level battery monitors. Unlike the MAX6433–MAX6438 subfamily which offers user-adjustable thresholds via external resistors, the MAX6429 utilizes factory-trimmed thresholds. This family is fully specified over temperature and is intended for portable electronic devices requiring reliable battery status indication.

Replacement Considerations

The MAX6427 and MAX6428 are part of the same family with similar functionality but different factory-trimmed threshold voltages. Verify that the threshold specifications of these alternatives meet the specific low-battery detection requirements of the target application before substitution.