CXLB73303 is a boost charge management chip based on asynchronous switch architecture, which supports efficient charging of 4~6 lithium batteries or lithium iron phosphate batteries. The chip has built-in power MOS, and the peripheral components are simplified, which effectively reduces the PCB area and reduces the system BOM cost. Its switching frequency is 500kHz, and its conversion efficiency reaches 84% under the conditions of 5V/2A input and 18.5V output, taking into account the charging speed and energy efficiency performance.
-
[ CXLB73303 ]"
With the rapid development of power tools, portable energy storage, industrial equipment and high-end drones, 4-6 lithium battery packs are becoming the preferred power supply for more and more high-performance equipment due to their high voltage and high energy density characteristics. However, how to use the universal 5V power supply to achieve efficient, safe and stable charging for multiple battery packs has always been a technical difficulty faced by engineers. As an asynchronous boost charging management chip designed for 4~6 strings of lithium batteries or lithium iron phosphate batteries, CXLB73303 has become an ideal solution for high string number battery charging systems with its conversion efficiency of up to 84%, fully integrated protection mechanism and highly flexible design. This article will comprehensively analyze the core characteristics, working principles, typical applications and design points of the CXLB73303 to help engineers build a high-performance, high-reliability multi-string battery charging system.
1. CXLB73303 overview: the professional choice for high string number battery charging
CXLB73303 is a boost charge management chip based on asynchronous switch architecture, which supports efficient charging of 4~6 lithium batteries or lithium iron phosphate batteries. The chip has built-in power MOS, and the peripheral components are simplified, which effectively reduces the PCB area and reduces the system BOM cost. Its switching frequency is 500kHz, and its conversion efficiency reaches 84% under the conditions of 5V/2A input and 18.5V output, taking into account the charging speed and energy efficiency performance.
The chip is packaged in ESOP8, which has good thermal performance and electrical isolation capability, and is suitable for applications with compact space and high thermal requirements. Its input voltage range is 4.5V ~ 5.5V, which perfectly matches 5V power supplies such as USB Type-C and adapters. It is widely used in power tools, energy storage power supplies, industrial handheld devices, high-end lighting systems and other fields.
Detailed explanation of the core functional characteristics of the 2.
2.1. Wide range battery pack support with high precision voltage setting
The CXLB73303 supports 4 to 6 strings of ternary lithium batteries and lithium iron phosphate batteries. The standard product is 5 strings of ternary lithium solutions. Other strings or battery systems can be customized. Users can flexibly set the constant voltage charging voltage through the external resistor of VSET pin to meet the charging requirements of different battery systems and improve the adaptability of the system.
2.2. Intelligent input current regulation and efficient charging management
The chip sets the input constant current charging current through the ISET pin external resistor, and the maximum support is 2.4A. The built-in input voltage regulator loop can automatically adjust the charging current when the input voltage is close to the undervoltage threshold, prevent the adapter from overloading, and improve system compatibility and safety.
2.3. Complete three-stage charging process
The CXLB73303 adopts the classic current elimination/constant current/constant voltage charging mode:
· Current elimination charging: When the battery voltage is lower than the threshold, pre-charge with a small current of 200mA to activate the deep discharge battery;
· Constant current charging: Quickly replenish energy for the battery with the set current;
· Constant voltage charging: When the battery voltage is close to the set value, it enters the constant voltage mode, and the current gradually decreases until it is fully charged.
2.4. Multiple system protection mechanisms
Input undervoltage/overvoltage protection: Monitor the input voltage status and stop charging when abnormal;
· NTC temperature protection: Support low temperature, medium and low temperature, high temperature three-stage protection, low temperature stop charging, medium and low temperature flow reduction, high temperature stop charging;
· IC over-temperature protection: Turn off the output when the internal temperature of the chip exceeds 135 ℃, and recover after the temperature drops to 110 ℃;
· ESD 4KV: Enhance the anti-static ability of the system and improve the durability of the product.
2.5. Intelligent LED status indication
The chip supports single-pin drive dual LED indicator lights, which clearly shows the states of charging, full charge, abnormal temperature, battery not connected, etc., and improves user experience and system maintainability.
3. typical application scenarios
3.1. Power tools and garden equipment
Such as electric drills, angle grinders, chainsaws, lawn mowers, etc., often using 4 to 6 strings of lithium battery power supply. The CXLB73303 can provide fast and stable charging support, and its high efficiency and good temperature control performance are suitable for high-rate charging scenarios.
3.2. Portable energy storage and UPS system
In outdoor power supply, household energy storage, small UPS and other equipment, the CXLB73303 can provide reliable charging management for lithium iron phosphate or ternary lithium battery pack, and cooperate with NTC protection to enhance system safety.
3.3. Industrial handheld equipment and testing instruments
Such as industrial scanning guns, thermometers, data collectors, etc., can use CXLB73303 to build a compact and efficient multi-string battery charging circuit to extend equipment life and ensure safe use.
3.4. High-end drones and robots
In the field of high power reliability requirements, CXLB73303 also has a wide range of applications with its comprehensive protection mechanism and stable output performance.
4. design guidelines and practical recommendations
4.1. Selection of key peripheral components
· Inductance: It is recommended to select a power inductor with saturation current greater than 3.5A, DCR less than 35mΩ and inductance value of 4.7μH to ensure stable operation at 500kHz switching frequency;
· Capacitance: It is recommended to configure 10μF and 1μF ceramic capacitors for input and output respectively, and the withstand voltage should be reasonably selected according to the system voltage;
· Set resistance: According to the target charging current and voltage, refer to the data sheet to select the appropriate RISET and RVSET resistance values.
4.2. PCB Layout Recommendations
· Power Path: VIN-inductor-LX-BAT loop should be short and thick to reduce parasitic parameters and conduction losses;
· signal isolationVSET, ISET, NTC and other analog pins should be far away from the switch node to avoid noise interference;
· Heat dissipation design: The bottom of the chip should be connected to the bottom copper skin through heat dissipation vias to improve the overall heat dissipation performance.
4.3. NTC protection circuit design
· If the NTC function is not required, connect the NTC pin to the ground with a 10kΩ resistor;
· If the NTC function is used, an NTC resistor that meets the temperature curve requirements should be selected and installed close to the battery to accurately reflect the battery temperature.
Why did 5. choose CXLB73303?
In the current multi-string lithium battery charging chip market, CXLB73303 to "high string support, high integration, high reliability" as the core advantage, fully meet the high efficiency, high safety and flexible configuration requirements of high-performance equipment for power supply solutions. Its built-in power MOS and streamlined peripheral design significantly reduce system complexity and cost, and its rich protection features and flexible setup make it ideal for 4 to 6 string battery charging scenarios.
Whether you are a power engineer, system architect or procurement specialist, CXLB73303 can provide you with stable performance, reliable supply, cost-effective charging solutions.
6. Typical Application Schematic Diagram and BOM
Seven, package and pin function
8. epilogue
As the market for power tools, energy storage systems and industrial equipment continues to expand, efficient, safe and flexible multi-string battery charging solutions have become a key element of product success. With its professional design concept and comprehensive functional configuration, the CXLB73303 is providing strong technical support for the application of 4~6 series lithium batteries.
If you are looking for a high-string battery boost charge management IC with excellent performance, simple design and stable supply, it is CXLB73303 worthy of your attention and choice. Welcome to visitJTM-IC official websiteWith detailed technical information, sample information and comprehensive support services, we look forward to working with you to promote smarter and more reliable power solutions.
