BQ24381DSGR

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Introduction to BQ24381DSGR

BQ24381DSGR is a fully-integrated Li-ion battery charge management system designed to protect a single Li-ion battery during charging and provide system power. It integrates battery voltage and current monitoring, a power switch, two power MOSFETs, two current sense amplifiers, and a regulated charge pump to provide a simple, convenient, and safe method of charging and power distribution. The power management solution also includes a variety of protection features for the battery pack, system and operation.

Application Field and Working Principle of BQ24381DSGR

BQ24381DSGR is an integrated Li-ion charger solution and primarily used for tablets, ultrabooks, PDA, USB consumers, headsets, and other mobile electronics. It can also be applied in a variety of applications, including automotive, home electronics, and consumer electronics.

The BQ24381DSGR provides battery protection by monitoring both the battery voltage and current. The voltage and current of the battery will be maximized on the command of the controller bus in order to maximize the output capacity of the system. It also features a variety of protection functions including thermal shutdown, undervoltage lockout, overvoltage protection, overcurrent protection, and dead battery protection.

The integrated charge pump further reduce the number of external components required by the system. It delivers an adjustable output voltage using a buck-synchronous buck converter topology for more efficient power transfer. Additionally, the charge pump gives users more flexibility in their design with the ability to enable and disable the output voltage via the bus controller.

In addition to the charge pump, BQ24381DSGR also includes two independent power MOSFETs - one for high-side load switching, and one for low-side load switching. Both are rated for a maximum voltage of 4.5V and a maximum current of 2.5A. The MOSFETs are configurable for application specific power management and thermal protection needs.

The BQ24381DSGR features a 2.5A charge pump that allows for both low-power and high-power operations. The high-power mode can reach up to 9.5W, while the low-power mode is limited to 6W. This allows the integrated solution to connect to a wide range of device peripherals and to optimize the power delivery between them. Additionally, it includes a power switch with thermal detection and soft-start capabilities that eliminates the need for an external PMOS device. This provides a solution for devices which cannot provide enough power for their internal power management systems.

BQ24381DSGR can also be used in single Li-ion battery applications, as it provides an over-voltage protection (OVP) to prevent a voltage surge when charging a single Li-ion battery. When the OVP function is enabled, battery voltage will be automatically cutoff when the battery charge level reaches 4.2V – this prevents the battery from overcharging and potential damage.

Conclusion

BQ24381DSGR is a fully-integrated Li-ion battery charge management system designed to protect a single Li-ion battery during charging and provide system power. With its integrated charge pump, two power MOSFETs, current sense amplifiers, and a variety of protection functions, the BQ24381DSGR can help simplify and optimize the battery power distribution. Its power management solution is applied in various industries, including automotive, home electronics, and consumer electronics.

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