BQ24707RGRT

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Battery Chemistry:	Lithium-Ion
Number of Cells:	1 ~ 4
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	Over Current, Over Voltage, Short Circuit
Charge Current - Max:	--
Battery Pack Voltage:	19.2V (Max)
Voltage - Supply (Max):	24V
Interface:	I²C
Operating Temperature:	0°C ~ 125°C (TJ)
Package / Case:	20-VFQFN Exposed Pad
Supplier Device Package:	20-VQFN (3.5x3.5)
Base Part Number:	BQ24707

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What is BQ24707RGRT
BQ24707RGRT is a PMIC (power management IC) designed to provide a battery charging function for mobile and other applications using one or two Li-Ion or Li-Polymer batteries. BQ24707RGRT provides several features such as programmable charge current and termination, independent charge enable/disable, low-battery-voltage protection, USB-port control, battery operation temperature, and optional reverse-battery protection. This device also provides thermal regulation, programmable high-potential safety timer interval, and overvoltage protection. With all of these integrated features, it is able to achieve high efficiency and improved safety for the power management and battery charging system, making it a suitable solution for portable applications.

Application Field of BQ24707RGRT
BQ24707RGRT can be used in a wide range of applications, from mobile phones and digital cameras to portable devices such as laptop computers and MP3/MP4 players. The device ensures that the battery operates safely, optimizing the load balance between the batteries and the power supply, so that it can maximize the battery life time under the same conditions. Furthermore, it is also suitable for applications such as back-up power systems. The BQ24707RGRT can be used in systems where multiple batteries are connected in parallel and charge management is required. With the built-in reverse battery protection, the safety of the system is greatly improved. The over voltage protection feature of the device also provides better system protections against transient conditions.

Working Principle of BQ24707RGRT
The working principle of the BQ24707RGRT is based on a synchronous buck converter and a two-charge-level architecture. When starting up, the battery voltage is sensed and a voltage trip level is set in the switch control circuit of the buck converter. When the voltage drops below this trip level, the buck converter is activated and starts to convert the input power to charging current. The amount of charging current is determined by the programmed value. When the battery voltage is within the allowed range, the Buck Converter is disabled and the voltage droop is used to keep the input current low. When the charge voltage is in the range lower than the allowed range, the Buck Converter is activated and the output current is provided by charging the battery.

The BQ24707RGRT also includes a temperature regulator to maintain the best possible temperature for charging. Automatic switching between the buck converter and the high-side charger is used to make sure that the device is always in the optimal state. In addition, it provides a separate charge enable line, so that the charge current can be easily controlled and monitored. Lastly, an optional Low Voltage protection prevents the battery from being overcharged or discharged.

Conclusion
In conclusion, the BQ24707RGRT is a versatile PMIC (power management IC) designed to provide a reliable battery charging function. It features integrated features such as programmable charge current and termination, independent charge enable/disable, low-battery-voltage protection, USB-port control, battery operation temperature, and optional reverse-battery protection. With these integrated features, it is able to achieve high efficiency and improved safety for the power management and battery charging process, making it a suitable solution for various types of portable applications.

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