MAX14745AEWX+T

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Battery chargers are fundamental part of any device that is powered by a battery. With more and more portable, battery powered devices being developed, a reliable and efficient battery charger is essential. The MAX14745AEWX+T is a battery charger from Maxim Integrated that falls under this category. This application notes will explore the features, application field and working principle of the MAX14745AEWX+T.

Features of MAX14745AEWX+T
The MAX14745AEWX+T is a fully integrated single-cell Li+ battery charger with a wide input voltage range. It is built with Maxim Integrated’s advanced Constant Maximum Voltage algorithm that guarantees fast, safe and accurate charging, extending battery life and maximizing device performance. The regulated output voltage of MAX14745AEWX+T is adjustable between 4.2V and 4.35V, making it suitable for a wide range of Li+ batteries.

The key features of this battery charger include:

• Low Input Voltage Range: 4.4V to 6.5V
• Input Current Limit: 1A nominal
• Charging Current up to 2A
• High Efficiency: >90% at 1A
• Thermal Regulation Mode: Adjusts charge current to maintain junction temperature below 155০C
• Tiny IC package: TDFN-10 (3mm ৩ 3mm)
• Integrated Capacitor for Output Ripple Control

Application Field of MAX14745AEWX+T
The MAX14745AEWX+T is suitable for use in portable battery-powered devices such as phones, tablets, handsets and other similar devices. With its small size and wide input voltage range, it is an ideal solution for space-constrained portable electronics applications where a reliable and efficient battery charger is needed.

The MAX14745AEWX+T can also be used in wearable devices and Internet of Things (IoT) applications that require power and fast charging. Its advanced algorithms ensure that the charger operates safely and optimally, extending battery life and protecting against overcharging, undercharging and over-temperature conditions.

Working Principle of MAX14745AEWX+T
The MAX14745AEWX+T follows a constant maximum voltage charging algorithm. When the battery is connected to the charger, the current limit is set to the minimum charge current. This current then ramp up to the maximum charging current until it reaches the maximum voltage threshold. Once it reaches the threshold, the current then shuts off to prevent over-charging. The process is continuously repeated until the battery is charged. The charger also incorporates features such as over-temperature protection, short circuit protection and over-voltage protection to ensure safe charging.

The MAX14745AEWX+T also features a Thermal Regulation Mode (TRM) to maintain the junction temperature below 155°C. This TRM feature adjusts the current to maintain the device temperature below a predefined threshold. This ensures that the device is operated safely and optimally, even in extreme temperatures.

The charger also features an integrated capacitor to reduce output ripple. This helps to ensure that even when the battery undergoes rapid cycles of charging and discharging, it operates at its optimum level.

The MAX14745AEWX+T is a reliable and efficient battery charger that is suitable for use in a wide range of portable battery-powered devices. Its wide input voltage range, advanced algorithms and integrated output ripple control ensure that the charger operates safely and optimally, extending battery life and protecting against overcharging, undercharging and over-temperature conditions.

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