Introduction

The MAX8903HETI+T is a highly integrated battery charger and system power management integrated circuit (PMIC) from Maxim Integrated.

The MAX8903HETI+T is a small, low-power, high-efficiency battery charger and system power management PMIC solution for applications such as wearable devices and medical applications. It is designed to provide separate charging and discharging paths for powering two Li-Ion/Polymer cell batteries simultaneously. Additionally, it includes high-side and low-side switches, high-performance precision-tunable buck regulators, and various other features.

In this paper, we will discuss the application fields and working principle of the MAX8903HETI+T PMIC.

Application Fields

The MAX8903HETI+T is designed to be used in low-power applications in which a high efficiency battery charger is needed, such as wearable devices, medical applications and other applications requiring precision control over battery charging. Additionally, the MAX8903HETI+T is also used to improve the battery life in applications that require a longer charge cycle. For instance, the MAX8903HETI+T can be used to optimize battery charging in applications like:

• Smart watches
• Medical devices
• Portable test equipment
• Portable navigation systems
• Portable games
• Wireless headphones

Working Principle

The MAX8903HETI+T is a highly integrated PMIC with a dual-cell battery charger, high-side and low-side switches, high-performance precision-tunable buck regulators, and various other features.

The MAX8903HETI+T offers a wide input voltage range from 0V to 6V, allowing for a single source of power. The device also features an integrated reverse battery diode, which allows the input reverse voltage protection to operate from 0V to 6V and a reverse current of up to 10A.

The MAX8903HETI+T\'s two-cell battery charger is designed to support 2 Li-ion/Li-Poly batteries simultaneously. The charger supports a wide range of charging modes including constant current, constant voltage and temperature sensing. Additionally, the charger is designed to reduce the power-up time by detecting the battery type, dynamically adjusting the charging current, and terminating charging when the battery is full.

The MAX8903HETI+T also provides two high-side switches that can be used to control the supply voltage to external devices, as well as two low-side switches designed to control the discharge of external components and circuits. The device also has two high-performance, precision-tunable buck regulators, which can be used to supply the power for non-battery powered load applications.

In addition, the MAX8903HETI+T includes various features such as an over-voltage protection circuit, an over-temperature protection circuit, an over-current protection circuit, and a short-circuit protection circuit.

Conclusion

The MAX8903HETI+T is a highly integrated PMIC for battery charging and system power management. It is designed to be used in low-power applications, providing a high-efficiency battery charger with integrated reverse battery diode, high-side and low-side switches, and precision-tunable buck regulators. Additionally, the MAX8903HETI+T provides various protection circuits to ensure safe and efficient charging.