MAX1898EUB42+T

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Rechargeable batteries have become a necessary part of modern life, and Power Management Integrated Circuits (PMICs) play an essential role in providing power solutions for all kinds of low-power applications. One of the most important PMIC device categories are battery chargers, which are used to charge and maintain rechargeable batteries. Among them, Maxim Integrated’s MAX1898EUB42+T is a highly efficient, versatile battery charger that can be used in a wide range of applications. This article will outline the application fields of MAX1898EUB42+T, and explain its operating principle.

The MAX1898EUB42+T is a multi-chemistry Li+ battery charger that provides a convenient and efficient charge control solution. It can charge 1-cell, 2-cell, and 3-cell batteries with high-speed current up to 1.5A per cell. The device can be configured to charge different battery chemistries such as Li-ion, LiFePO4, or NiMH/NiCd, and enables easy adaptation between battery chemistries via a pair of pins. With an internal linear regulator, the battery charger can support output voltages from 3.2V to 28V, making it suitable for various applications.

Apart from these features, the MAX1898EUB42+T also provides numerous safety features that increase the product reliability. A built-in temperature monitor, for example, will reduce the charging current automatically if the device temperature gets too high. The device also has a low dropout current sense amplifier to precisely adjust current with low voltage losses during the charging process. With over-temperature, over-voltage, and over-current protection, the device can protect the battery from damage even in unstable power environment.

The versatile features of the MAX1898EUB42+T make it suitable for a wide range of applications. The device is specifically designed for portable electronic devices, such as cellphone and notebooks, that require short charging times, energy efficiency, and flexibility for battery type and size selection. The device can also be used in charging systems for electric vehicle (EV) and plug-in hybrid electric vehicle (PHEV). Due to its robust safety features and wide output voltage range, the MAX1898EUB42+T is also suitable for industrial applications, such as in 3.6V battery systems used in uninterruptible power supplies (UPSs) and portable power tools.

The MAX1898EUB42+T is designed with a switched capacitor charge pump charge-control technique. The device controls the battery voltage by increasing or decreasing the current output. A differential amplifier, or error amplyer, senses the battery voltage and provides an error signal to the charge-control block. This error signal, in combination with a clock signal, is then used to adjust a digitally controlled fine-resolution capacitor array to achieve highly accurate battery-voltage regulation. Thanks to this method, the device can reach 95% charge efficiency and faster charge times.

In summary, the MAX1898EUB42+T is a highly efficient and versatile multi-chemistry Li+ battery charger that is well-suited for a variety of low-power applications. The device features robust safety features, a wide range of output voltages, and a switched capacitor charge pump charge-control technique to ensure high efficiency and fast charge times. With its flexibility and reliability, the MAX1898EUB42+T is an ideal choice for portable electronic devices, electric vehicles and industrial applications.

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