BQ2057CDGKR

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The BQ2057CDGKR is a PMIC (Power Management Integrated Circuit) battery charger designed to charge single or two-cell Li-Ion or Li-Polymer battery packs from 12V sources, such as USB ports or other battery supplies. It is a low quiescent current, high-efficiency device that operates at temperatures from -40°C to +85°C.

The BQ2057CDGKR device contains an internal charge controller and power-management features, allowing the use of very small external components for the application. Extensive user programmability also provides flexibility to meet various application requirements.

The BQ2057CDGKR integrated circuitry provides several battery-charger functions, including input current limiting, high-voltage input battery detection, battery over-temperature protection, cell balancing and charge status reporting. The charger also has the capability to sense the level of charge of the battery pack and terminate the charge at the correct level. The device controls charge current in two ranges by adjusting an external resistor, allowing a dynamic range of 1.7 mA-4.2A for battery charging.

The BQ2057CDGKR is capable of supporting both constant-voltage (CV) and constant-current (CC) charging profiles. It uses a constant-voltage algorithm until the current level is at a setpoint, and then transitions to a constant-current algorithm. This protects the battery and limits the overcharging risk without relying on a separate charging circuit.

The BQ2057CDGKR also has a user-programmable timer. When enabled, the timer will shut off the charger after a predetermined time has elapsed, regardless of the remaining battery charge level. A battery maintenance feature is also included, allowing the charging to be resumed if the voltage drops below a certain level.

The BQ2057CDGKR also includes safety features such as input overvoltage protection and reverse-polarity protection. It also has integrated current limiters, as well as reverse-current protection, to prevent loss of energy from the system.

The BQ2057CDGKR is a versatile, high-efficiency and low-quiescent current device, making it ideal for cost-sensitive applications such as mobile phone chargers, laptop adapters and portable media player charging systems. It is also suitable for use in automotive, industrial and medical applications.

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