MAX1757EAI

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Power management integrated circuits (PMIC) are an essential device for applications such as mobile phones, tablets, and other battery powered devices. The MAX1757EAI is a PMIC specifically designed to address the battery charging needs of these devices. It provides a high efficiency, highly integrated, battery charger solution that eliminates the need for external components. In this article, we will discuss the MAX1757EAI application field and working principle.

MAX1757EAI Application Field

The MAX1757EAI is optimized for charging one or two Li+ battery cells. It is ideal for use in high-end mobile phones and other battery powered devices such as tablets, GPS, digital cameras, and others. The high efficiency of the MAX1757EAI makes it an excellent solution for OEMs that are looking to minimize charging time while maximizing battery life. The high integration of the MAX1757EAI reduces system components and costs, making it a cost-effective solution.

The MAX1757EAI is packaged in a 3x3mm 20-pin QFN package and operates from an input voltage range of 2.7V to 5.5V. It has a wide temperature range of -40C to +85C, making it suitable for a wide range of applications. It also has a range of protection features, including overvoltage, overcurrent, and short circuit protection.

MAX1757EAI Working Principle

The MAX1757EAI utilizes a space-efficient buck-boost charge control architecture to optimize efficiency and minimize system components. The device combines input switching, inductor current sensing, and cell voltage regulation in a single, highly integrated package. The device regulates the input voltage to a fixed output voltage of 4.2V, regardless of the input voltage or battery voltage.

The MAX1757EAI also offers a wide range of programmable features, allowing users to tune the device to their specific application. It includes charge current and termination current settings, allowing users to set the desired charge current and termination current, and a soft-start timer, allowing users to set the charge profile to interface with different battery chemistries. It also includes a sleep mode and auto-restart functionality, allowing the device to enter sleep mode when the input voltage is low or when the battery is fully charged.

The MAX1757EAI is also designed with synchronization in mind. It features an external sync pin that can be used to synchronize the charge cycle with an MCU or other power management IC. This allows the device to enter sleep mode when the system is in low power, improving system efficiency.

Conclusion

The MAX1757EAI is an ideal solution for high efficiency, single or dual cell Li+ battery charger applications. It integrates input switching, inductor current sensing, and cell voltage regulation into a single package, eliminating the need for external components. It offers a wide range of programmable features, allowing users to tune the device to their specific application. It also features an external sync pin, allowing it to be synchronized with an MCU or other power management IC. With its small size, wide temperature range, and low cost, the MAX1757EAI is an excellent solution for battery charging needs.

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