BQ24901PWRG4

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	1
Current - Charging:	Constant - Programmable
Programmable Features:	Current, Timer
Fault Protection:	Short Circuit
Charge Current - Max:	30mA
Battery Pack Voltage:	4.2V
Voltage - Supply (Max):	10V
Interface:	--
Operating Temperature:	-20°C ~ 85°C (TA)
Package / Case:	14-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	14-TSSOP
Base Part Number:	BQ24901

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BQ24901PWRG4 Application Field and Working Principle

PMIC - Battery Chargers have become more and more crucial for a range of modern applications. BQ24901PWRG4 is a highly efficient device of this kind, which provide high speed battery charging, one of the most important features for modern portable electronics.

Features of BQ24901PWRG4

The BQ24901PWRG4 implements a dual loop topology, combining Primary and Second-stage power conversion. It provides an efficient Buck-Boost regulator, active Discharge/Charge FET control, and a simple user-programmable input charge current. It supports both input voltage or input current based charging algorithms, as well as an open system configuration. Furthermore, it is compatible with a wide range of batteries, including Li-Ion, Li-Polymer and Lead Acid. The BQ24901PWRG4 has a number of protection and monitoring features too, including cell voltage monitoring, short circuit protection, battery over-temperature protection, overcharge protection, and overdischarge protection. Also, it includes a current limited and programmable fast charging profile for single cell, dual cell and multi-cell Li-Ion batteries.

Application field of BQ24901PWRG4

The BQ24901PWRG4 is suitable for a wide range of devices, including portable digital media players, mobile phones, PDAs, iPod-like devices, and other low-power applications. It can also be used in high-end battery-powered devices like GPS, digital cameras, medical equipment, and other high-end consumer electronics. The BQ24901PWRG4 is also very useful for high performance cordless tools and industrial equipment, especially tools that require long run times and higher charging rates. Additionally, it can be used in many solar powered applications.

Working principle of BQ24901PWRG4

The BQ24901PWRG4 battery charger consists of a primary amplifier, which amplifies the input voltage or current to drive a load, and a second stage control circuit, which regulates the output voltage and current pulses to the battery cells. The amplifier is implemented as an H-bridge converter with an output filter. It takes a DC input voltage and produces a modulated AC output. This AC output is then passed through a filter to create a rectified DC output, at a voltage that is regulated via feedback from the battery cells. The second stage controller adjusts the primary amplifier feedback to maintain the desired output voltage, and also provides protection functions (over-voltage, under-voltage, over-temperature, etc) to prevent damage to the battery cells.

Conclusion

The BQ24901PWRG4 is a highly efficient PMIC- Battery Charger offering a number of features and a wide application range. It provides fast, efficient charging for a wide range of batteries, and includes a range of protection and monitoring features. Its dual-loop topology makes it ideal for high-end applications, and its open system configuration allows for versatility for different types of battery charging. With such features, the BQ24901PWRG4 is an ideal choice for any battery charged application.

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