MAX8731AETI+

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The MAX8731AETI+ PMIC (Power Management Integrated Circuit) is a high-performance, integrated battery charger controller suitable for use with most off-the-shelf single-cell Li-ion (lithium-ion) and LiFePO4 (lithium-ion ferrophosphate) batteries. Designed for low-power applications, the MAX8731AETI+ PMIC enables the efficient and safe charging and discharging of rechargeable batteries in portable, handheld devices and other consumer applications. In this article, we’ll examine the MAX871AETI+ PMIC’s application field and working principle.

Application Field

The MAX8731AETI+ PMIC\'s versatile design and range of features makes it ideal for use in both light-load and high-load applications, such as portable and handheld devices. Its integrated features allow for the efficient charging and discharging of a wide variety of battery types, including single-cell Li-ion and LiFePO4 cells. Additionally, the MAX871AETI+ PMIC\'s integrated safety features reduce the risk of overcharging, over-temperature, and short circuit conditions.

The MAX8731AETI+ PMIC\'s unique design also allows for the charging of two batteries in parallel configuration. This makes it suitable for use in applications such as two-cell battery packs, radios and PDAs. Additionally, its high-efficiency synchronous Buck converter topology makes it an ideal choice for applications such as digital still cameras and mobile phones where improved power efficiency is required.

Working Principle

The MAX8731AETI+ PMIC uses a synchronous Buck converter topology to convert the input voltage to the desired battery charge voltage. This topology is both efficient and cost-effective, and helps to reduce the amount of power wasted as heat. Additionally, the PMIC features an integrated linear MOSFET to regulate the current and protect the battery cell from damage.

The MAX8731AETI+ PMIC includes an integrated battery temperature monitor that limits the maximum charge current when the temperature of the battery cell is too high or too low. This feature helps to ensure the safety of the battery and increase its lifespan. Additionally, the PMIC\'s advanced charging algorithm helps to improve charge acceptance and charge time while minimising the risk of overcharging and battery swelling.

Finally, the integrated MPU (microprocessor unit) in the MAX8731AETI+ PMIC monitors the battery voltage, current, and temperature during the charging process, and responds to changes in these values by adjusting the charge current to maintain the desired charge level. This feature helps to improve charging reliability and efficiency while ensuring the safety of the battery cell.

In conclusion, it is clear that the MAX8731AETI+ PMIC is an ideal choice for applications requiring efficient and reliable charging of Li-ion and LiFePO4 batteries. Its integrated features make the PMIC suitable for both light-load and high-load applications, and help to ensure the safety of the battery cells. Additionally, its advanced charging algorithm helps to improve charge acceptance and charge time, while minimising the risk of overcharging and battery swelling.

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