CXLB73338 is a lithium battery charging management chip with multiple protection functions, suitable for programmable charging current range from 3mA to 600mA. Its biggest highlight lies in the world's first positive and negative reverse connection protection function. Whether it is the reverse connection of the battery or the power input, the chip can effectively protect the system from damage. In addition, the chip adopts three-stage charging control of current elimination, constant current and constant voltage. The charging voltage can support 4.35V, 4.2V and 3.7V three gears through model selection to adapt to different lithium battery specifications.
-
[ CXLB73338 ]"
CXLB73338: an efficient and safe single lithium battery charging chip
With the increasing popularity of portable electronic devices, the safe and efficient charging of lithium batteries has become a key link in the design. As a complete single lithium battery charging chip, CXLB73338 provides reliable charging solutions for all kinds of portable devices with its unique function and stable performance. This article will introduce the core features, application scenarios and usage suggestions of CXLB73338 in depth to help engineers and developers make better use of the chip for design.
I. Core features of CXLB73338
CXLB73338 is a lithium battery charging management chip with multiple protection functions, suitable for programmable charging current range from 3mA to 600mA. The biggest highlight isThe world's first positive and negative reverse connection protection function, whether it is the reverse connection of the battery or the power input, the chip can effectively protect the system from damage. In addition, the chip adopts three-stage charging control of current elimination, constant current and constant voltage. The charging voltage can support 4.35V, 4.2V and 3.7V three gears through model selection to adapt to different lithium battery specifications.
The chip has built-in thermal feedback adjustment mechanism, which can automatically reduce the charging current in high temperature environment, prevent overheating and improve system reliability. Its SOT23-6 package is compact and has few external components, which is very suitable for portable devices with limited space.
II. Comprehensive protection mechanism
CXLB73338 has outstanding security performance and multiple protection functions:
· Battery reverse connection protection: When the positive and negative poles of the battery are reversed, the chip enters the shutdown state, no charging current output, and the leakage current is less than 5mA, effectively avoiding battery damage.
· Power Reverse connection protection: When the input power supply is connected in reverse, the chip also enters the protection state, and the leakage current is less than 10μa to ensure system safety.
· Undervoltage lockout: When the input voltage is lower than the set threshold, the chip is suspended to prevent abnormal power supply status.
· Over-temperature protection: the temperature sensor is integrated inside the chip to automatically reduce the charging current when the junction temperature exceeds 135 ℃ to avoid overheating damage.
III. Flexible application design
CXLB73338 is suitable for a variety of power input, including USB port and power adapter, with strong compatibility. Its charging current can be flexibly set by external resistor, which is convenient for users to adjust according to different battery capacity and charging requirements. The chip also provides two open-drain output status indicator pins (CHRG and STDBY), which can be connected to LED or MCU to display the charging status in real time.
Typical applications include:
·Miniature lithium battery, charging set, mobile power supply
·Cellular phones, tablets, MP3 player
·Bluetooth headset, bracelet and other wearable devices
IV. Suggestions and optimization
To ensure that CXLB73338 works stably under various working conditions, we recommend that you pay attention to the following points during design:
4.1. Power supply and battery capacitor: Connect 10 μF ceramic capacitors near Vcc and BAT pins respectively to suppress voltage spikes and noise and improve system stability.
4.2. Heat dissipation design: in high-current applications (such as more than 400mA), it is recommended to connect 0.3Ω to 0.6Ω dissipation resistance in series at the Vcc terminal, and combine with a good PCB layout to enhance the heat dissipation effect.
4.3. Status indication configuration: If the status indication function is not required, the unused CHRG or STDBY pins can be grounded to avoid interference.
V. Packaging and pin functions
6. Typical applications:
VII. Conclusion
With its comprehensive protection function, flexible current configuration and compact package, CXLB73338 is an ideal choice for charging management of single lithium battery. Whether in consumer electronics, IoT devices or portable medical devices, it can provide safe, efficient and stable charging performance.
For more information about CXLB73338 technical information, sample application or design support, please visit our official website.jtm-ic.com. JTM-IC is committed to providing high-quality integrated circuit solutions to customers around the world, helping the innovation and development of smart devices.
8. Related productsmore...
