CXLB73301 is a boost battery charging management chip with asynchronous switch architecture, which supports charging management of 2~3 lithium batteries or lithium iron phosphate batteries. The chip has built-in power MOS, the peripheral circuit is simple, the PCB area is effectively reduced and the system BOM cost is reduced. Its switching frequency is 500kHz, and the conversion efficiency is as high as 84% under the conditions of 5V/2A input and 8V output, which improves the charging speed while taking into account the energy efficiency performance.
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[ CXLB73301 ]"
With the rapid development of portable electronic devices, power tools, smart homes and various energy storage systems, efficient, safe and integrated battery charging management solutions have become an indispensable part of product design. As an asynchronous boost charging management chip designed for 2~3 strings of lithium batteries or lithium iron phosphate batteries, CXLB73301 is becoming the first choice for many engineers in power management design with its high integration, high efficiency and comprehensive protection functions. This article will comprehensively introduce the performance characteristics, working principle, typical applications and design points of the CXLB73301, help readers to understand the chip, and provide practical reference for product selection and development.
1. CXLB73301 overview: high performance asynchronous boost charging chip
CXLB73301 is a boost battery charging management chip with asynchronous switch architecture, which supports charging management of 2~3 lithium batteries or lithium iron phosphate batteries. The chip has built-in power MOS, the peripheral circuit is simple, the PCB area is effectively reduced and the system BOM cost is reduced. Its switching frequency is 500kHz, and the conversion efficiency is as high as 84% under the conditions of 5V/2A input and 8V output, which improves the charging speed while taking into account the energy efficiency performance.
The CXLB73301 has multiple safety mechanisms such as input undervoltage protection, overvoltage protection, intelligent input current regulation, NTC temperature protection, etc., which can effectively prevent system failures caused by adapter overload, battery overheating or abnormal voltage, and greatly improve the reliability of the whole machine.
Detailed explanation of the core functional characteristics of the 2.
2.1. Wide range battery compatible with high precision voltage setting
The CXLB73301 supports 2~3 strings of lithium batteries (standard model is 2 strings, 3 strings are CXLB73301_3S) and lithium iron phosphate batteries (customizable). 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 scheme.
2.2. Input constant current charging and intelligent load adaptation
The chip sets the constant current charging current of the input terminal through the ISET pin external resistor, and supports a maximum of 2A. The built-in input voltage regulator loop can automatically adjust the charging current when the input voltage is close to the undervoltage threshold, avoiding pulling the adapter and improving system compatibility and safety.
2.3. Complete charging process management
The CXLB73301 uses the classic current elimination/constant current/constant voltage (TK/CC/CV) charging mode, with 0V battery activation capability. When the battery voltage is low, the current elimination charging is carried out first, and it is gradually switched to the constant current and constant voltage stage with the voltage rise. At the end of charging, the current is automatically detected and the charging is stopped, and the voltage drop after the battery is fully charged is supported to ensure that the battery is always in a saturated state.
2.4. Comprehensive system protection mechanisms
Input undervoltage/overvoltage protection: Monitor the input voltage status and stop charging when abnormal;
· NTC temperature protection: Through the external NTC resistance real-time monitoring of battery temperature, low temperature or high temperature automatically 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. Portable electric tools
For 2~3 strings of lithium battery-powered drills, angle grinders, hand saws and other tools, the CXLB73301 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. Household Energy Storage and UPS Backup Power Supply
In low-power energy storage equipment and household UPS systems, the CXLB73301 can provide reliable charging management for lithium iron phosphate or ternary lithium battery packs, and cooperate with NTC protection to enhance system safety.
3.3. Smart Home and Internet of Things Devices
Products such as sweeping robots, electric curtains, security cameras, etc., can use CXLB73301 to build compact and efficient charging circuits to extend equipment life and ensure safe use.
3.4. Medical and Industrial Portable Equipment
In the field of high power reliability requirements, CXLB73301 also has a wide range of applications with its comprehensive protection mechanism and stable output performance.
4. Design Guidelines and Considerations
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 2.2μH 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 paths (VIN, LX, BAT) should be short and thick to reduce parasitic parameters and conduction losses;
· Analog setting pins (VSET, ISET, NTC) need to be far away from the switch node to avoid noise interference;
· Star grounding or single point grounding is recommended for grounding design to ensure signal integrity.
4.3. Thermal management considerations
Although the CXLB73301 has built-in over-temperature protection, attention should still be paid to the heat dissipation design in the actual design, especially in high-load or high-temperature environments, the temperature rise of the chip can be reduced by laying copper and adding heat dissipation vias.
Why did 5. choose CXLB73301?
In the current battery management chip market, the CXLB73301 takes "high integration, high efficiency, and high reliability" as its core advantages, which fully meets the miniaturization, safety and cost control requirements of modern electronic equipment for power solutions. Its asynchronous architecture and built-in power MOS significantly simplify the design difficulty, and its rich protection functions and flexible setting methods make it an ideal choice for multi-string lithium battery charging scenarios.
Whether you are a power engineer, system architect or procurement specialist, CXLB73301 can provide you with stable performance, reliable supply, cost-effective charging solutions.
6. Typical Application Schematic Diagram and BOM
Seven, package and pin function
EightConclusion
With the continuous penetration of lithium battery technology in various industries, efficient and safe battery management chips have become one of the key elements of product success. With its professional design concept and comprehensive functional configuration, the CXLB73301 is providing strong technical support for 2~3 string lithium battery applications.
If you are looking for a boost charging management chip with excellent performance, simple design and stable supply, it is CXLB73301 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.
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