MAX8765AETI+

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MAX8765AETI+ is a power management integrated circuit (PMIC), specifically designed as a battery charger. A power management integrated circuit is a chip which contains multiple DC-to-DC converters, linear regulators, controllers, drivers, and other supporting circuits. The power management features enables engineers to design miniature power solutions with high field performance and low energy consumption. In the following overview, we will look at the application field and its working principle for MAX8765AETI+.

Application Field

MAX8765AETI+ is a highly integrated battery charger for single-cell, rechargeable Li-ion or Li-polymer batteries. It can safely and quickly charge a 3.2V nominal cell from 0% to 100% while taking up to 3A of current. The charger also has advanced features such as float charging and reverse charging which allows it to be used in a wide variety of applications. The charger also has an adjustable input current limit, programmable power up/down current limits, and low-battery pre-charge.

The MAX8765AETI+ can be used for applications such as mobile phones, portable music players, digital cameras, and personal digital assistants (PDAs). It also has features such as preset or adjustable charge termination voltage and charge current, over voltage protection, short-circuit output protection, and thermal protection. These features make it suitable for other applications such as notebook PCs, medical equipment, and industrial systems.

Working Principle

The MAX8765AETI+ integrates a current-mode constant on-time (COT) Buck converter, an integrated battery protector, and an interfacing logic circuit to provide a complete solution for battery-charging applications. The COT Buck converter operates in a continuous conduction mode (CCM) where the output voltage is proportional to the duty cycle of the switching transistor, and the duty cycle is directly proportional to the input voltage. The battery protector controls the current flowing from the battery by driving the gate of the switch high when the battery is full or when the current limit is surpassed, and driving it low when the battery is empty or the current limit is not surpassed.

The logic circuit consists of a differential amplifier, a comparator, and a timer. The differential amplifier is used to compare the input signal to a preset voltage, and the comparator is used to detect the current limit of the battery. The timer is used to count the time for which the current limit of the battery is detected and control the charging process accordingly. The MAX8765AETI+ also has integrated over-voltage and thermal protection to ensure safe and efficient operation of the battery charger.

Overall, the MAX8765AETI+ is a highly integrated, cost-effective solution for battery-charging applications. Its advanced features and robust protection make it suitable for a wide variety of applications and make it one of the best PMIC battery chargers on the market.

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