BQ24770EVM-540

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The BQ24770EVM-540 is an Evaluation and Demonstration Board and Kit that provides engineers with the necessary tools to evaluate and demonstrate how the BQ24770 Synchronous Switch-Mode Battery Charger IC can meet their design requirements. The addition of the BQ24770EVM-540 to the existing BQ24770EVM-520 adds to existing solutions to reduce design time, accelerate development, and reduce the number of external components required for efficient battery charging. This paper discusses the application field and working principle for the BQ24770EVM-540 Evaluation and Demonstration Board and Kit.

Introduction

The BQ24770EVM-540 is an Evaluation and Demonstration Board and Kit designed to provide a complete-solution environment for the evaluation and demonstration of the BQ24770 Synchronous Switch-Mode Battery Charger IC. The BQ24770EVM-540 is an advanced-design evaluation and demonstration board that allows users to quickly and easily evaluate the BQ24770 directly on their application. The advanced design combines current-source operation with direct-connect and switch-mode topologies to provide an efficient solution for charging a wide variety of battery chemistries.

Application Field

The BQ24770EVM-540 is designed for use in system designs that require high current, efficient charging of lead-acid, lithium-ion, and other battery chemistries. Typical applications include automotive, electric vehicle, consumer electronics, medical/industrial equipment, and instrumentation/sensing systems.

The advanced design of the BQ24770EVM-540 allows for a wide range of input voltages, from 4.5V to 28V, allowing it to be used in applications with power sources ranging from USB to automotive battery systems. The BQ24770EVM-540 also supports a wide output voltage range, from 0.5V to 15V, allowing it to be used in applications with nearly any type of battery chemistry. A selectable power path pin allows for optimal management of energy coming from either the AC adapter or a vehicle power source.

The BQ24770EVM-540 can be used to charge a wide range of battery chemistries, including, but not limited to, parallel connected Li-ion, LiFePO4, NiMH, NiCd, lead acid, and other types of batteries. The feature-rich design of the BQ24770EVM-540 allows for precise control over the charge, discharge, and maintenance cycles of the battery, making it an ideal choice for battery management solutions.

Working Principle

The BQ24770EVM-540 Evaluation and Demonstration Board and Kit operates with several key features based on its underlying design. In a typical configuration, the BQ24770EVM-540 is used to charge a battery connected to the charger’s input terminals. The charger will monitor the battery’s voltage and current and will adjust the charge current to maintain a safe charging regimen for the battery.

The BQ24770EVM-540 is a current-source design that uses a regulated binary-counter PWM controller to precisely control the output current. The current-source design automatically adjusts to the voltage of the battery being charged, thus creating an efficient management of the power transfer.

The BQ24770EVM-540 provides a selection of charge and discharge current limit according to battery chemistry. The matched over-current limit and float voltage settings of the charger are easily adjustable, allowing ultimate protection for the battery. The charge terminated voltage settings, LED indicator lights, temperature monitor output, fault reporting, and other features can all be customized to the user’s design requirements.

The BQ24770EVM-540 also provides a selection of power path options to further optimize the power flow when the charger is connected to an external wall adapter or vehicle power source. The design of the BQ24770EVM-540 allows fast switchover between power sources with minimal power loss, providing higher efficiency than traditional diode-OR power paths.

Conclusion

The BQ24770EVM-540 Evaluation and Demonstration Board and Kit is a powerful tool for evaluating and demonstrating the capabilities of the BQ24770 Synchronous Switch-Mode Battery Charger IC. The advanced design offers efficient current-source operation and direct-connect and switch-mode topologies. The BQ24770EVM-540 provides a complete-solution environment for the evaluation and demonstration of the BQ24770, and is ideal for system designs that require high current, efficient charging of lead-acid, lithium-ion, and other battery chemistries. With its wide range of input and output voltages, selectable power paths, adjustable current and voltage limits, LED status indicator, and temperature monitor output, the BQ24770EVM-540 meets the design requirements for a wide variety of applications and can be used to quickly and efficiently charge virtually any type of battery.

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