BQ24650RVAR

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Power management integrated circuits (PMICs) are essential components of most modern electronic devices, providing the necessary conditions for a stable and regulated power supply. Among the various PMICs available, the BQ24650RVAR is a specialized battery charging controller capable of providing output currents of up to 2A and perfect for battery-powered applications. This application note explains the BQ24650RVAR’s applications and its working principle.

PMIC - Battery Chargers

Applications of BQ24650RVAR

The BQ24650RVAR is a highly versatile battery charger and power management device, which is suitable for a wide variety of battery-powered applications, such as portable electronic devices, power tools, and medical equipment. It provides a current-limited output current of up to 2A and a voltage setting as high as 4.2V and as low as 2.7V. It also features input-current limitation, battery float voltage regulation, low dropout voltage regulation, over-temperature protection, short-circuit protection, and sophisticated charge cycles that optimize the charging time for different types of batteries.

The BQ24650RVAR is also capable of delivering output power to the system load and the battery simultaneously, making it ideal for applications that require continuous power delivery. In addition, it is designed to reduce power consumption, featuring an automatic sleep mode that reduces the current consumption to 1µA when no load is present.

Working Principle of BQ24650RVAR

The BQ24650RVAR utilizes a 3-level charge pump and a multi-state charge control system to provide the optimal charging algorithm for various types of rechargeable batteries. The charge current is limited by a charge current limit setting, while the voltage is set by a voltage regulator. The 3-level charge pump boosts the charging voltage, which is then regulated to the desired voltage level using the voltage regulator.

The BQ24650RVAR is capable of providing a safety timer to prevent overcharging of the battery by shutting off the charging process after a predetermined time. In addition, it features an under-voltage lockout (UVLO) circuit, which prevents the device from starting the charging process if the battery voltage is below a certain threshold.

The multi-state charge control system of the BQ24650RVAR automatically switches to different charge states depending on the current condition of the battery. It also provides an Auto Safety Charge termination function that automatically adjusts the current level for fast charging, and switches to a low current level for trickle or float charging.

The BQ24650RVAR also includes various safety features, such as battery temperature monitoring, overcharge detection, overcurrent protection, and short-circuit protection. In addition, it is designed to minimize power dissipation, offering a low standby current of 1.5µA.

Conclusion

The BQ24650RVAR is an efficient battery charger and power management device, perfect for a wide range of battery-powered applications. It features high current output capability, comprehensive safety features, and a sophisticated multi-state charge control system to maximize charge time and safety. This makes the BQ24650RVAR an ideal choice for applications that require dependable power delivery, low power consumption, and reliable charge control.

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