BQ24704RGER

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Not For New Designs
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	2 ~ 4
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	Over Current, Over Temperature, Over Voltage
Charge Current - Max:	8A
Battery Pack Voltage:	18V (Max)
Voltage - Supply (Max):	24V
Interface:	--
Operating Temperature:	-40°C ~ 125°C (TJ)
Package / Case:	24-VFQFN Exposed Pad
Supplier Device Package:	24-VQFN (4x4)
Base Part Number:	BQ24704

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Introduction

The BQ24704RGER is an integrated, feature-rich, cost-effective battery charger for single-cell lithium-ion and lithium-ion polymer battery applications. It features an automatic input current limiting circuitry and an auto-adjust charging current for the connected battery, enabling a balance between rapid charging and system efficiency. The BQ24704RGER is targeted for consumer and energy storage applications and supports wide range of consumer devices such as mobile phones, PDAs, music players, digital cameras and other portable consumer electronics devices.

Application Field

The BQ24704RGER is a high-performance integrated battery charger IC designed for consumer using lithium-ion and lithium-ion polymer battery applications. It is designed to maximize system run time by automatically selecting the best charging current for the detection battery type. The BQ24704RGER supports fast charging and allows up to 2A of charge current, depending on the selected charge method. This device is suitable for mobile phones, PDAs, music players, digital cameras and other portable consumer electronics devices.

Working Principle

The BQ24704RGER operates in three stages, which are pre-charge, CC and CV. During the pre-charge stage, the BQ24704RGER detects the battery\'s capacity and ability to accept current and adjusts the current and voltage of the charging application accordingly. The CC (constant current) stage then begins, where the BQ24704RGER provides a regulated current to the battery to achieve fast charging. Finally, the CV (constant voltage) stage is initiated, and a defined voltage is provided to the battery until the full charge has been achieved. During the charge process, the battery temperature is monitored and protected with built-in thermal protections. The BQ24704RGER will also reduce the charge current automatically when the battery temperature reaches the preset value.

Conclusion

The BQ24704RGER is an integrated, feature-rich, cost-effective battery charger for single-cell lithium-ion and lithium-ion polymer battery applications. It is designed to maximize system run time by automatically selecting the best charging current for the detection battery type and supports fast charging, allowing up to 2amp of charge current. During the charge process, the battery temperature is monitored and protected with built-in thermal protections. The BQ24704RGER is suitable for mobile phones, PDAs, music players, digital cameras and other portable consumer electronics devices.

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