BQ2057CDGKRG4

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PMIC (Power Management Integrated Circuit) - Battery Chargers are common pieces of equipment in modern electronics and can be found in a wide variety of applications and devices. The BQ2057CDGKRG4 is a battery charger IC (Integrated Circuit) designed for single and dual cell Li-Ion/Li-Polymer battery charging applications. It is designed for today\'s single-chip solutions for various consumer and industrial applications. As with all battery chargers, the BQ2057CDGKRG4 is designed to efficiently maintain a constant charge state for a battery to ensure safe and reliable operation.

Application field and working principle

The BQ2057CDGKRG4 is typically used in portable electronic devices such as consumer goods, medical instruments, and industrial products such as power tools, two-way radios, and dataloggers. This charger IC is optimized for single- and dual-cell Lithium-ion and Lithium-polymer battery packs, with support for all battery configurations - 1S, 2S, and 1S/2S. The main features of the BQ2057CDGKRG4 include adjustable charge current, charge-to-terminate switch, voltage-mode fast-charge control, soft start, and I2C port. Furthermore, a special feature of the IC is its ability to cut off charge current when the battery temperature exceeds a safety threshold, and can even reduce the charge current when the battery is close to full charge.

The BQ2057CDGKRG4 is typically driven by a switching sepic or a boost converter, and utilizes a voltage-mode charge control. Its output is a constant-voltage, constant-current charger. In voltage-mode control, the charger maintains a constant output voltage while adjusting the charge current to maintain a constant charging power and quickly regulate from empty to full battery state. This voltage-mode charge control has a number of advantages over current-mode control and allows for fast charging rates up to 1.5 A, with a small form factor and low component count.

The BQ2057CDGKRG4 is equipped with a precision A/D converter to precisely measure battery voltages and temperatures. This allows for the IC to accurately control and monitor the battery for maximum safety and performance. The micro-controller embedded in the chip integrates a safety feature that prevents the charge current from exceeding a preset safety threshold when the battery temperature is outside the normal range. Additionally, the integrated I2C port allows for the communication of charge status and other parameters to an external system, such as an MCU, to provide an additional level of control.

Another unique feature of the BQ2057CDGKRG4 is its low operating power consumption and small size, making it an ideal choice for portable applications. It utilizes a high-efficiency synchronous rectification topology in order to minimize power losses, resulting in high power conversion efficiency and low heat generation. Furthermore, its small size allows it to be integrated into a variety of application boards, resulting in a reduction of space and cost.

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