MAX1909ETI+

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MAX1909ETI+ is a PMIC - Battery Charger application which provides a fully integrated, low-cost solution for portable applications. This battery charger solution includes a linear wall adapter preregulator, a synchronous buck battery charger, a high-accuracy fuel gauge, an adjustable current-limit system, a current-sense amplifier for varying charger output current, an integrated system controller, and an I2C/SMBus interface. It is designed for charging Li-Ion, Li-Polymer, and NiMH batteries from 5V USB and wall adapter power sources.

The system controller has advanced features for battery charging, including temperature-dependant charging, under-voltage protection, battery temperature-threshold protection, charge safety timers, and pre-charge limits. These features, combined with the integrated current-sense amplifier, make the MAX1909ETI+ an ideal solution for low-cost wall adapters. The battery charger also supports NiMH DC safety timers and several factory-programmed profile settings.

The MAX1909ETI+ can be configured to recharge a single-cell or dual-cell battery pack at up to 1A. The built-in system controller supports an adjustable current-limit system that helps to prevent adverse effects associated with incorrect input current limits. This adjustable current limit ensures that the battery charge current is not exceeded and protects the battery during charging.

The MAX1909ETI+ also features a high-accuracy battery fuels gauge. The fuel gauge can measure the battery’s state-of-charge and report it as a percentage. In addition, the fuel gauge eliminates the need for manual battery-life estimation for charging purposes. The fuel gauge can also detect and help prevent overcharging, which allows for longer battery life. Finally, the MAX1909ETI+ also features an I2C/SMBus interface for easy communication with host systems.

The working principle of the MAX1909ETI+ is simple and efficient. The first step in the charge cycle is the wall adapter pre-regulator, which regulates the input power to a constant 12V output. This 12V output is then used to power the battery charger, which charges the battery at a regulated current and voltage. Once the battery is fully charged, the charger automatically switches to a “maintenance charge”, which keeps the battery at full capacity. The controller then monitors the battery and automatically charges it when the capacity drops below a predetermined level.

The MAX1909ETI+ also utilizes a current-sense amplifier to measure the battery current during charging and protect the battery from being overcharged. The MAX1909ETI+ also features an adjustable current-limit system that helps protect the battery from high current surges. Finally, a fuel gauge detects the battery’s state-of-charge and reports it to the system controller for further processing.

In conclusion, the MAX1909ETI+ is an advanced integrated PMIC - Battery Charger solution designed for portable applications. This charger offers a complete solution for both charging and maintaining the battery. It features an adjustable current-limit system, temperature-dependent charging, and a high-accuracy fuel gauge. The integrated system controller allows for easy communication with host systems as well. With its advanced features and simple working principle, the MAX1909ETI+ is the ideal solution for battery charging needs.

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