BQ24401PWG4

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The BQ24401PWG4 is a fully integrated, PowerPath™-managed, standard Li-ion linear battery charger IC. It is designed to quickly and safely charge single-cell Li-ion/polymer batteries. It is an ideal solution for charging a wide variety of battery capacities, from tiny 500mAh to over 8200mAh batteries, with an input voltage of 5V to 18V and an output voltage of 4.2V. The BQ24401PWG4 offers a low-voltage battery protection and an improved battery status detection capability to reduce system power consumption. Furthermore, it provides a charge termination feature using the NTC resistor for accurate temperature monitoring.

Features of BQ24401PWG4

• Low Resistance, 2.5 mΩ, Input FET
• Current Sense Amplifier with Programmable Gain
• Internal Power Switches
• Two High-Side N-channel FETs for External Protection
• Thermistor Input for Temperature Monitoring
• Programmable Charge Voltage (4.2V)
• Current, Power and Safety Timers

Application Fields of BQ24401PWG4

The BQ24401PWG4 is suitable for a variety of applications, including battery charging in portable medical, consumer and industrial equipment, tablet, power tools, battery-operated appliances and even outdoor sports equipment. It can also be used to charge automotive applications like electric vehicles, hybrid electric vehicles and range extending vehicles. With its low resistance input FET and programmable gain, it is an ideal choice for various applications requiring a robust solution.

Working Principle of BQ24401PWG4

The BQ24401PWG4 is a standard Li-ion linear battery charger featuring an extremely low on-resistance input FET. The charger is powered by a wide range of input voltages from 5V to 18V. The internal power switches are integrated in the chip, eliminating the need for external components and saving board space. The charger also has an internal current sense amplifier with a programmable gain. It is designed to detect the amount of current being drawn and adjust the charge voltage accordingly. This helps to minimize the current draw, optimize the output voltage and extend the life of the battery.

The BQ24401PWG4 features a thermal-sensing circuit for temperature monitoring and a safety timer for overcharge protection. The charger supports a current, power, and safety timer threshold setting to suspends the charging process if these are exceeded. Additionally, the BQ24401PWG4 supports NTC resistor input, which can be used to terminate the charging process if the battery temperature exceeds a certain threshold. All these features make the BQ24401PWG4 an ideal battery charger IC.

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