CXLB74110 is an intelligent power management chip designed specifically for 4.35V lithium-ion batteries. It adopts advanced ESOP-8 packaging and achieves three major functions of charging management, boost conversion, and power monitoring on a single chip. Its unique architecture eliminates the need for current detection resistors in traditional designs, significantly improving system efficiency and significantly reducing overall costs and PCB footprint.
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[ CXLB74110 ]"
CXLB74110: Deep Analysis of Revolutionary Single Inductance Bidirectional Power Management Chip
In today's rapidly developing portable electronic devices, efficient power management solutions have become the key to improving user experience. CXLB74110, as an innovative chip that integrates 3A switch charging, 2.4A boost output, and precise power meter, achieves bidirectional power conversion through a single inductor, providing an unprecedented high integration solution for mobile power banks, smartphones, and tablet devices.
1、 Product Core Overview
CXLB74110 is an intelligent power management chip designed specifically for 4.35V lithium-ion batteries. It adopts advanced ESOP-8 packaging and achieves three major functions of charging management, boost conversion, and power monitoring on a single chip. Its unique architecture eliminates the need for current detection resistors in traditional designs, significantly improving system efficiency and significantly reducing overall costs and PCB footprint.
This chip supports a maximum charging current of 3A and a boost output of 2.4A, achieving a conversion efficiency of up to 96% in both charging and boost modes. Its intelligent mode automatic detection and switching mechanism ensures the optimal performance of the system in different working states.
2、 Core technical characteristics
2.1 Innovative single inductor bidirectional architecture
CXLB74110 adopts patented single inductor bidirectional power conversion technology:
• Bidirectional power flowUsing the same inductor to achieve charging and discharging functions
• Automatic mode switchingIntelligent recognition of working status, seamless switching
• Space optimizationSignificantly reduce the number of external components and PCB area
• cost-effectivenessSimplify system design and reduce BOM costs
2.2 Efficient charging management system
• high-current chargingSupport up to 3A charging current, quickly restore battery energy
• Precise voltage control4.35V constant voltage charging, accuracy± 50mV
• Intelligent charging managementSupport the entire process of pre charging, constant current charging, and constant voltage charging
• Non sensing resistor designPatent control scheme eliminates current detection resistor loss
2.3 Stable boost output performance
• 5V boost outputStable provision of 5.1V typical output voltage
• High current capability: Supports 2.4A continuous output current
• Wide input rangeThe battery voltage can work stably from 3.2V to 4.35V
• High conversion efficiencyMaintain excellent efficiency throughout the entire load range
2.4 Accurate electricity metering system
• Level 4 LED indication: Intuitively display the remaining battery status
• Intelligent power algorithmAccurately estimate the remaining capacity of the battery
• No battery detectionAutomatic recognition of battery insertion status
• user-friendlyProvide clear visual feedback on battery level
3、 Detailed technical parameters
3.1 Charging mode characteristics
• Input voltage range4.5V-5.5V (USB input)
• Charging cut-off voltage4.35V (default, adjustable)
• Pre charge threshold2.8V (with 250mV hysteresis)
• Pre charging current：200mA
• Charging termination current：200mA
• Charging restart threshold：-160mV
3.2 Boost mode characteristics
• output voltage5.05V-5.25V (unloaded)
• Start threshold: 3.2V (battery voltage, with 0.4V hysteresis)
• switching frequency：550kHz-750kHz
• Peak current limit：5.0A
• maximum duty cycle：90%
3.3 Power device parameters
• High end PMOS Rdson：75mΩ (Typical value)
• Low end NMOS Rdson：70mΩ (Typical value)
• quiescent current: 80μ A (battery mode)
• operating current: 5mA (switch mode)
4、 Comprehensive protection mechanism guarantees
4.1 Multiple security protections
• short circuit protectionHiccup mode protection, 45ms on/2000ms off cycle
• over-temperature protectionTurn off at 150 ℃, restore at 130 ℃
• Thermal regulationAutomatic adjustment of charging current at 85 ℃
• ESD protection: 2kV HBM, 200V MM grade
4.2 System reliability design
• Input undervoltage lock4.5V startup threshold, 500mV hysteresis
• Battery TestingAutomatic recognition of battery free status
• Soft start mechanism: Avoid surge current impact
• Automatic fault recoveryAutomatically resume normal operation after protection is lifted
5、 Typical Application Design Guidelines
Selection of peripheral components
Inductance selection：
• Recommended value: 4.7μ H-10μ H
• Saturation current:>5A
• DC resistance: ＜ 20mΩ
Capacitor configuration：
• Input capacitance: 10 μ F ceramic capacitor
• Output capacitance: 22F or larger ceramic capacitor
• Battery capacitance: 10 μ F ceramic capacitor
PCB layout suggestions
Optimized PCB layout is crucial for performance:
• Power pathCIN, COUP, and inductance should be placed as close as possible to the chip pins
• Grounding separationSeparate layout of analog ground (AGND) and power ground (PGND)
• **Thermal design * *: Fully utilize exposed solder pads for heat dissipation
• Signal IntegrityKeep the feedback network away from noise sources
6、 Deep analysis of application scenarios
1. Mobile power bank design
CXLB74110 is an ideal choice for mobile power applications:
• high integrationSingle chip completes all power management functions
• high efficiency: Bi directional 96% efficiency maximizes battery utilization
• compact designMinimize PCB size, suitable for portable devices
• user experienceAccurate battery display enhances user satisfaction
2. Smartphones and tablets
Advantages of application in smart devices:
• fast charging3A charging significantly reduces charging time
• Space savingSingle inductor design saves valuable internal space
• stable outputProvide a stable 5V power supply for the system
• intelligent managementComprehensive protection mechanism ensures equipment safety
3. Other portable devices
Suitable for various lithium battery powered devices:
• Portable medical equipment
• Industrial handheld terminal
• IoT devices
• Consumer electronics products
4. Summary of Performance Advantages
CXLB74110 has significant advantages in the field of power management chips:
4.1 progressiveness technology
• Leading industry in single inductor bidirectional architecture
• Innovative Design of Resistance without Current Detection
• Intelligent automatic mode switching technology
4.2 Excellent Performance
• Charging and boosting dual-mode high efficiency
• High current output capability
• Accurate electricity metering
4.3 Application Flexibility
• Wide range operating voltage
• Multiple packaging options
• Rich peripheral interfaces
4.4 Cost effectiveness
• Reduce the number of external components
• Simplify PCB design
• Reduce the total cost of the system
5. Design verification and testing
In practical application testing, CXLB74110 performed well:
5.1 Efficiency test results
• Charging modeUnder a charging current of 2.1A, the efficiency remains above 92%
• boost modeEfficiency exceeds 90% at 2A output current
• Light load efficiencyMaintain an efficiency of over 85% under a load of 100mA
5.2 Thermal Performance
• Excellent temperature control during normal operation
• Timely response of thermal protection mechanism
• Heat dissipation design meets industrial grade requirements
5.3 Dynamic Response
• Fast transient response of load
• Smooth and impact free mode switching
• Stable and reliable startup process
Conclusion
CXLB74110 provides a perfect power solution for portable electronic devices with its innovative single inductor bidirectional architecture, efficient power conversion, and precise power management. Whether it is for mobile power banks that pursue compact design or smart devices that require efficient charging, this chip can provide excellent performance.
With the continuous improvement of power management requirements for portable devices, CXLB74110 will continue to play an important role in the field of power management with its high integration, high efficiency, and high reliability, promoting the development of electronic devices towards thinner and more efficient directions.
For detailed technical information, sample applications, or design support for CXLB74110, please visit the JTM-IC official website;jtm-ic.comOur professional technical team will provide you with comprehensive technical support and services.
article authorJTM-IC Technical Team
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