CXLB74105 is a professional USB mobile device charging interface control chip that adopts advanced Qualcomm Quick Charge 3.0 technology standards. It can accurately adjust the HVDCP (High Voltage Dedicated Charging Port) output voltage according to the actual needs of the connected device. This intelligent voltage regulation mechanism ensures that mobile devices can always obtain maximum available current from the charging port while maintaining optimal energy efficiency performance.
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[ CXLB74105 ]"
CXLB74105: Comprehensive Analysis of Intelligent QC3.0 Fast Charging Protocol Control Chip
In today's rapidly developing mobile devices, charging speed and efficiency have become key factors in user experience. CXLB74105, as a USB charging interface control chip that complies with Qualcomm Quick Charge 3.0 A-class/B-class specifications, provides an efficient and safe charging solution for modern electronic devices through intelligent voltage regulation technology, saving up to 75% of charging time and completely changing the traditional charging experience.
Product Core Overview
CXLB74105 is a professional USB mobile device charging interface control chip that adopts advanced Qualcomm Quick Charge 3.0 technology standards. It can accurately adjust the HVDCP (High Voltage Dedicated Charging Port) output voltage according to the actual needs of the connected device. This intelligent voltage regulation mechanism ensures that mobile devices can always obtain maximum available current from the charging port while maintaining optimal energy efficiency performance.
This chip has a wide range of device compatibility, fully supporting Apple iPad, Apple iPhone, Samsung Galaxy Note series devices, and compatible with BC1.2 and YD/T 1591 charging standards, covering almost all mainstream mobile devices. Its intelligent recognition system can automatically detect the device type when connected and select the most suitable charging protocol, providing users with a seamless charging experience.
Core technical characteristics
Comprehensive fast charging protocol support
CXLB74105 supports the latest Quick Charge 3.0 technical specifications, including:
• A-class specificationOutput voltage range of 3.6V~12V, precisely adjusted in 200mV steps
• B-class specificationOutput voltage range of 3.6V~20V, meeting higher power requirements
• backward compatibleFully supports 5V, 9V, 12V, and 20V output voltage levels for QC2.0 protocol
• Intelligent protocol switchingAutomatically identify the fast charging protocol versions supported by the device
Intelligent Device Recognition System
The chip is equipped with advanced device recognition algorithms that can accurately identify:
• Apple devicesSupports 2.1A/2.4A charging modes
• Samsung devicesCompatible with Galaxy Note series 2.0A charging
• BC1.2 standard equipmentCompliant with USB battery charging specification version 1.2
• YD/T 1591 standardMeet the standard requirements of China's communication industry
Excellent electrical performance
• ultra-low powerWhen outputting at 5V, the power consumption is only 1mW, and the energy efficiency performance is excellent
• High ESD protection4kV electrostatic protection level ensures system reliability
• Wide temperature rangeOperating temperature range of -40 ℃ to 125 ℃, suitable for various environments
• Dual packaging optionProvide two packaging forms: SOP-8 and SOT23-6
Detailed technical parameters
Extreme working conditions
• VBUS pin voltage: -0.3V~8V
• VDD pin voltage: -0.3V~8V
• DP/DM data line voltage: -0.3V~5V
• Working temperature range: -40 ℃ to 150 ℃
• ESD protection level: 4000V (human body model)
Electrical characteristic parameters
• VDD working voltage3.1V~7.2V (using internal resistance)
• VDD working currentTypical value 220μ A (VDD=4.5V)
• Reference voltage output：1.0V± 2% (IREF pin)
• Data line detection voltageTypical value of 0.325V
• Reference for selecting output voltageTypical value of 2.0V
temporal characteristic
• D+high-level filteringTypical value of 1.25 seconds
• D-low level filtering: 1ms typical value
• Output voltage variation filtering: 40ms typical value
• Device connection detection filteringTypical value of 160ms
Deep analysis of working principle
Intelligent protocol handshake process
CXLB74105 executes the complete protocol handshake process during device connection:
• Initial detectionAfter inserting the device, first perform USB BC1.2 protocol handshake
• protocol identificationCheck if the device supports QC2.0 or QC3.0 protocol
• Mode Switch: Close the short-circuit switch between D+and D -
• Voltage negotiationNegotiate output voltage based on device requirements
• stable outputEstablish a stable fast charging connection
Design of Parallel Voltage Regulator
The chip adopts an innovative parallel regulator architecture:
• Through internal 2KΩ Resistance or external 2KΩ The resistor supplies power from VBUS to VDD
• Internal voltage regulator clamps VDD voltage at 6V
• Supports a wide range of output voltages from 3.6V to 20V
• Recommend using a 470nF VDD bypass capacitor to ensure stability
Voltage precise regulation mechanism
CXLB74105 achieves precise voltage step control through an external reference resistor:
• Formula for current step value:Δ IREF = (1/5) × (1.0V/RREF)
• Feedback network resistance matching requirement: R1=RREF
• Support fine voltage adjustment in continuous mode
Typical application scenarios
Mobile phone charger and adapter
CXLB74105 is an ideal choice for smartphone chargers, providing fast charging for devices that support QC3.0 protocol while ensuring compatibility with traditional devices.
Mobile power bank design
In mobile power applications, the intelligent recognition function of the chip ensures the provision of optimal charging solutions for different devices, maximizing battery energy utilization.
car charger
The wide temperature range and stable performance make CXLB74105 very suitable for automotive charging environments, meeting the charging needs of in car electronic devices.
Multi port charging station
The small size and low power consumption characteristics of the chip make it the preferred solution for multi port charging stations, supporting intelligent fast charging for multiple devices simultaneously.
Design points and precautions
Selection of peripheral components
• VDD decoupling capacitor: 0.47μ F recommended value to ensure power stability
• reference resistorAccurately select RREF value to achieve the required current step
• Data line capacitorNot exceeding 1nF, ensuring signal integrity
Layout suggestions
• Try to shorten the wiring length of DP/DM as much as possible to reduce signal interference
• The VDD bypass capacitor should be placed near the chip pins
• Ensure a good grounding plane and improve the system's anti-interference ability
protective measures
• Ensure that the operating voltage does not exceed the absolute maximum rated value
• Pay attention to thermal design to avoid chip overheating
• Take appropriate ESD protection measures
Summary of Performance Advantages
CXLB74105 has significant advantages in the field of fast charging protocol chips:
• Technological LeadershipFully support the latest QC3.0 specifications
• Wide compatibility: Covering mainstream brands and device types
• Excellent energy efficiencyUltra low power design improves overall efficiency
• high reliabilityIndustrial temperature range and ESD protection
• Flexible designDual packaging options to adapt to different application requirements
Conclusion
CXLB74105, as a high-performance fast charging protocol control chip, provides a perfect solution for modern charging devices through its intelligent voltage regulation and wide device compatibility. Whether for consumer grade chargers or industrial grade charging devices, this chip can provide a stable, efficient, and safe fast charging experience.
With the continuous popularization of fast charging technology, CXLB74105 will continue to play an important role in the field of charging equipment, promoting the development of charging technology towards higher efficiency and intelligence.
For detailed technical information, sample applications, or design support for CXLB74105, please visit the JTM-IC official website;jtm-ic.comOur professional technical team will provide you with comprehensive technical services.
article authorJTM-IC Technical Team
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