MAX14745DEWX+T

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Introduction

The MAX14745DEWX+T is a Battery Charger (PMIC) from Maxim Integrated that implements a fast, back-to-back synchronous buck converter and Li-Ion/Li-Polymer linear charge management. The device is designed to offer a very simple, low-cost and high-efficiency solution for battery charging applications. The device uses a high switching frequency synchronous buck converter and a linear post regulator to reduce bill of materials (BOM) cost and total solution size.

Application field

The MAX14745DEWX+T is intended for in-system, 3-cell to 4-cell battery charging in Li-Ion and Li-polymer powered systems such as ultrabooks, tablets, and smartphones. Its wide input voltage range (4.75V to 22V) provides flexibility in back-to-back synchronous buck mode, linear post regulation. The IC has a 68-pin quad flat no-leads (QFN) package and with a peak switch current of 2A, it can support the full charge current of up to 1.5A.

Working Principle

The MAX14745DEWX+T works by using a high switching frequency synchronous buck converter to convert the system input voltage to an auxiliary supply voltage (V_AUX) that is then used to power the linear post regulator. The buck converter then directly charges the battery at a constant current, while the post regulator controls the charge voltage at the correct level. A power amplifier is used to drive the low side MOSFET while a comparator senses the voltage across the resistor to accurately measure the battery voltage.

The chip also features integrated slope compensation and a digitally controlled oscillator that can be configured to set the optimal switching frequency. The device also has an adjustable threshold to limit inrush current preventing damage to the system power supply, which can be adjusted using an external capacitor.

Conclusion

In conclusion, the MAX14745DEWX+T is a high-efficiency, low-cost PMIC that can be used for battery charging applications in mobile systems such as ultrabooks, tablets and smartphones. It offers the advantages of a high switching frequency synchronous buck converter and linear post regulation to save bill of materials cost and reduce the size of the total solution.

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