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MAX8934BETI+ Application Field and Working Principle

The MAX8934BETI+ is a Battery Charger IC designed by Maxim Integrated that is a highly integrated piece of hardware designed to reach a maximum charging efficiency and safety. This IC is suitable for a variety of applications, including Li-Ion and Li-Polymer battery charging, LiFePO4 batteries, LAN devices, consumer and smartphone applications, and ultra-low power designs. The IC utilizes a power switch and a single inductor when combined with external components for a complete battery charging solution.

Features

The MAX8934BETI+ is an advanced battery charger IC that has been designed in order to reduce system design complexity and improve design efficiency. It features a wide input voltage range from 4.5V to 23V and provides up to 4A of programmable maximum charging current. The output voltage is adjustable from 0.6V to 4.2V. The MAX8934BETI+ is designed to monitor both the input current, output current, as well as temperature of the device. This ensures high accuracy and protects the device from over voltage, over current, and over temperature conditions. Additionally, the built-in MOSFET allows for low external component count for space savings and eliminates the need for an external Schottky diode.

The IC features various safety features that include input under voltage lockout, output short circuit protection, thermal disconnect, short circuit protection, and overcharge protection. Additionally, the IC supports various battery types including Li-Ion, Li-Polymer, and LiFePO4.

Application Field

The MAX8934BETI+ is suitable for a variety of applications including Li-Ion and Li-Polymer battery charging. This IC is especially useful for battery powered designs such as routers, industrial cameras, and consumer and smartphone applications. It is also designed with a single inductor and a power switch, making it ideal for ultra-low power designs that require high efficiency power conversion.

Working Principle

The MAX8934BETI+ is a highly integrated IC that utilizes a single-stage buck-boost converter with an integrated switching MOSFET. The IC consists of an internal oscillator, along with a power switch, and an internal comparator which monitors input and output voltages. The IC uses Constant Current/Constant Voltage (CC/CV) charging method which is suitable for Li-Ion and Li-Polymer batteries. The IC also features an Automatic Power Path Selection (APP) which automatically routes power to either the system or the battery, depending on the needs of the system.

Conclusion

The MAX8934BETI+ is a battery charger IC designed by Maxim Integrated that is suitable for Li-Ion and Li-Polymer battery charging. It features a wide input voltage range, up to 4A charging current, versatile safety protections, and low external component count. With its highly integrated, low power design, the IC is an ideal choice for a variety of applications such as routers, industrial cameras, and consumer and smartphone applications.

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