MAX14578EEWC+T

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MAX14578EEWC+T has emerged as a prominent battery charger within power management integrated circuit (PMIC) – battery chargers, maximizing efficiency, size and reliability in charging solutions. This article outlines the application field and working principle of MAX14578EEWC+T, thereby giving a clear understanding of its capabilities and deployment.

Application Field

Maxim Integrated’s MAX14578EEWC+T is an ultra-small, two-phase, input synchronous battery charger, optimized for space and cost-sensitive designs. It is ideally suited for use in low-power, basic standby power cells for protection of the device’s battery, and can work with a personalized charging algorithm to effectively charge a wide variety of chemistries, including Li+ and NiCd.

The MAX14578EEWC+T offers a wide range of features, including two- and four-phase synchronous operation and a versatile input-voltage-level (VIN) range of 2.7 V to 22 V. It also offers programmable input current limit, temperature control, and over-voltage protection.

The MAX14578EEWC+T enables a low-cost, cost-effective solution to charging problems faced in today’s designs. It is particularly well suited for applications where space and reliability are of prime importance. Examples include wearables, Qorvo-styled chargers, industrial electronics and consumer electronic devices in general.

Working Principle

The MAX14578EEWC+T consists of four control loops: (1) the loop maintains battery voltage; (2) the inner loop controls the output current; (3) the temperature control loop maintains battery temperature; and (4) the input current loop avoids overloading the input power source.

The voltage loop controls the two-phase output voltage of the MAX14578EEWC+T to match that of the battery, so as to provide a steady state charging current. In the inner loop, when the power source voltage is higher than the battery voltage, the current flow will be inhibited. The temperature control loop is implemented to maintain a constant battery temperature by controlling the charging current. The input current loop is implemented to maintain the system’s stability, by controlling the voltage drop across the external MOSFET.

The MAX14578EEWC+T is capable of both two- and four-phase operation. In two-phase operation, it can support charging up to a maximum of 4 A. The linearity of the battery voltage path is improved by continuous modulated operation in two-phase mode, allowing for the efficient use of space. In four-phase operation, the battery voltage path is rectified to avoid the problem of linearity, thereby minimizing the risk of further degradation in the battery lifespan due to the charging process.

The user can select between two- and four-phase operation based on the requirements of the particular application. As the two-phase mode requires fewer components, it is ideal for small-sized applications that are still in need of efficient charging – for example, battery-powered medical equipment. In case of applications requiring higher charging current and/or more efficient charging operation, the four-phase mode can be employed.

Conclusion

Maxim Integrated’s MAX14578EEWC+T is an ultra-small, two-phase, input synchronous battery charger, optimized for space and cost-sensitive designs. It is part of PMIC - battery chargers, and can work with a personalized charging algorithm to effectively charge a wide variety of chemistries, including Li+, NiCd, and NiMH. It offers wide range of features such as two- and four-phase synchronous operation, input voltage range of 2.7 V to 22 V, programmable current limit, temperature control, and over-voltage protection.

The user can select between two- and four-phase operation based on the requirements of the particular application. The two-phase mode requires fewer components, and can support charging up to a maximum of 4 A. The four-phase mode, on the other hand, does not suffer from linearity issues, and can achieve higher charging currents.

Overall, the MAX14578EEWC+T is a reliable and cost-effective solution for applications requiring efficient and reliable charging.

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