MAX8903GETI+

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PMIC - Battery Chargers: MAX8903GETI+ Application Field and Working Principle

The MAX8903GETI+ is a single-cell Lithium-Ion (Li-Ion) or Lithium-Polymer (Li-Poly) battery charger. It is a complete charging solution that includes two voltage regulators, two linear current paths, and two buck converters, to provide up to two outputs. It is designed to charge a wide range of devices, ranging from consumer electronics, medical devices, industrial systems, and more.

This device is especially suitable for powering devices that are intended to offer long hours of use, such as handsets, tablets, or laptop PCs and provides a wide application field. The MAX8903GETI+ is also suitable for applications in wearable technology, such as smart watches and fitness trackers, where prolonged availability is needed. The wide input voltage range of the MAX8903GETI+ can provide a reliable charging platform for applications with both voltage and current variations.

The MAX8903GETI+ uses an automatic power path selection algorithm to ensure the most efficient and safe charging of the battery. In addition, the output voltage and current settings can be set manually or via an I2C interface. The MAX8903GETI+ also includes several protection features such as reverse-battery protection, over-voltage protection, current-limit protection, and thermal protection.

Working Principle

The MAX8903GETI+ features two separate power paths, a pre-charge path and the main charge path. The pre-charge path provides a stable current source during the initial battery charging, allowing the battery to reach a minimum voltage without excessive charge currents. The main charge path reduces the charge current as the battery voltage increases, while providing a stable voltage to the battery.

During pre-charge, the main charge path is disabled and the current is limited to the safe pre-charge current. This allows the battery to reach the optimal charge voltage quickly. The current is then adjusted as the battery voltage increases, providing a safe and efficient charge. Once the battery is fully charged, the charger will enter a top-off mode, which reduces the charge current to a trickle in order to ensure that the full capacity of the battery is used.

The MAX8903GETI+ also has the ability to detect the temperature of the system and adjust its power settings accordingly. This feature reduces the charge current in the presence of high temperatures, ensuring the safety of the system and preventing any potential damage to the battery. It also improves the efficiency of the charger, allowing it to charge at a lower rate while still providing the necessary power to the system.

Conclusion

The MAX8903GETI+ is a highly efficient and versatile charger that is suitable for use in a wide range of applications. The two-power path architecture ensures safe and efficient charging, while the temperature protection features add an additional layer of protection. With its wide input voltage range, the MAX8903GETI+ is capable of charging a variety of different devices and offers a reliable charging platform for both voltage and current variations.

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