MAX8900CEWV+T

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The MAX8900CEWV+T is a Battery Management System (BMS) integrated circuit (IC) for safety monitoring and charge voltage control. The device is primarily usedin lithium-ion and similar cell based battery systems and has a variety of features to offer, from cell protection to charge control. This article will discuss the application field and working principles of the MAX8900CEWV+T.

Overview

The MAX8900CEWV+T, manufactured by Maxim integrated, is a battery and cell management integrated circuit designed for use in lithium-ion and similar cell-based battery systems. It is available in a 10-lead, 2.5mm × 3 mm, Wafer Chip Scale Package (WCSP) and it can be interfaced and programmed using the Serial Peripheral Interface (SPI) bus. The device contains Analog and Embedded Processor features, like an I²C/SPI bus, on-chip cell protection, and integrated charge voltage control. It also provides an efficient charge cycle termination and monitoring of critical safety parameters. The device protects against overvoltage, undervoltage, over-discharge, and over-temperature conditions,and provides an accurate and reliable operation over a wide temperature range.

Application Field

The MAX8900CEWV+T is used in various applications including portable computing, consumer electronics, industrial, automotive, and medical devices. It is suitable for use in applications requiring a highly integrated battery management system and provides a cost-effective solution for the safe monitoring and charge control of Li-ion and Li-polymer battery packs. The device is also suitable for applications requiring small size, weight and power (SWaP) and for applications requiring high reliability and efficiency.

Working Principle

The MAX8900CEWV+T features an on-chip embedded processor that is capable of controlling charging parameters like the termination voltage and current, pre-charging current, cell balancing and safety protection. The device\'s charge current and voltage parameters can be programmed via the I2C or SPI bus. The device is designed to efficiently manage charging up to 4 cells in series with up to 4.5A peak current and 6A constant current. The device can be used with various power sources like AC/DC adapters, USB ports, solar panels and can be used with any type of Li-ion cell, including LiFePO4.

The device uses an analog interface which interfaces with the cell stack and monitors the cells with respect to each other. The device also uses an embedded processor to provide power cycling and over/under-voltage protections. The device is used for cell protection and charge control, and for safety monitoring, alarm activation and fault logging. The device monitors a variety of battery parameters, including voltage, current, temperature, and individual cell voltages, and provides protection against overvoltage, undervoltage, over-discharge, over-temperature and short-circuit conditions. It also offers protection against false activation of alarms, false termination of charge cycles, and power cycling.

Conclusion

The MAX8900CEWV+T offers an efficient and reliable solution for applications requiring a highly integrated battery management system. The device is suitable for use in a wide range of applications, including portable computing, consumer electronics, industrial, automotive, and medical devices. The device is specifically designed for monitoring and controlling of Li-ion and Li-polymer battery packs and provides cell protection, charge voltage control, efficient charge cycle termination and safety monitoring. The device uses an analog interface and an embedded processor to provide power cycling and over/under-voltage protection, along with providing accurate and reliable monitoring of a variety of battery parameters.

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