CXLB7395 is a dedicated battery management chip that integrates high-precision voltage detection and delay circuits, specifically designed for charging balance control of multiple lithium-ion battery packs. This chip monitors the voltage status of each battery in real-time, accurately controls the charging and discharging process, and ensures that the voltage of each individual cell in the battery pack remains balanced, thereby significantly improving the overall performance and service life of the battery pack.
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[ CXLB7395 ]"
CXLB7395: High precision lithium-ion battery pack balance management chip
In today's rapidly developing era of battery technology, the safety, efficiency, and lifespan of multi cell lithium battery packs have become core considerations in electronic device design. CXLB7395, as a professional multi cell battery pack single cell lithium-ion battery charging balance control chip, provides an ideal solution for high-end battery management systems with its excellent voltage detection accuracy, extremely low power consumption, and compact packaging design.
Product Overview
CXLB7395 is a dedicated battery management chip that integrates high-precision voltage detection and delay circuits, specifically designed for charging balance control of multiple lithium-ion battery packs. This chip monitors the voltage status of each battery in real-time, accurately controls the charging and discharging process, and ensures that the voltage of each individual cell in the battery pack remains balanced, thereby significantly improving the overall performance and service life of the battery pack.
The chip adopts advanced circuit architecture, with a typical power consumption of only 2.5 mA in working mode and a maximum power consumption of no more than 0.5 mA in standby mode. This ultra-low power consumption characteristic makes it particularly suitable for portable applications that are sensitive to power consumption. Its wide working temperature range (-40 ℃~+85 ℃) ensures stable and reliable operation in various harsh environments, meeting the strict requirements of industrial applications.
Core features and technological advantages
High precision voltage detection
CXLB7395 integrates industry-leading voltage detection circuits, providing precise multiple voltage protection:
• Overcharge detection voltage range: 4.000~4.500V, with high accuracy up to; 25mV
• Overcharge release voltage range: 3.800~4.500V, accuracy± 35mV
• Standby detection voltage: typical value 2.70V
• Internally integrated overcharge detection delay circuit, with a typical delay time of 250ms
Ultra low power design
• Working mode: Typical value 2.5μ A, maximum value 3.5μ A (VDD=3.9V)
• Standby mode: maximum value 0.5μ A (VDD=2.0V)
• System current: Typical value 2.5μ A (under VDD
• Excellent power consumption performance ensures long-term operation of the system without excessive energy loss
Efficient BJT driver configuration
CXLB7395 adopts an optimized NPN-BJT driving scheme:
• OUT output status L→ H is effective, directly driving NPN bipolar junction transistors
• The output current capability of the OUT terminal reaches 3mA, ensuring reliable switch control
• Output high voltage: VBI-0.02V (typical value)
• Output low voltage: 0.1V (typical value)
Compact packaging and environmental certification
• Adopting standard SOT-23-6 small package, greatly saving PCB layout space
• Complies with halogen-free green environmental standards and meets global RoHS compliance requirements
• Provide Tape& Reel packaging, suitable for automated large-scale production
Electrical characteristics and performance parameters
CXLB7395 maintains stable operation within a wide voltage range (1.5V~8V), and its key electrical parameters include:
• Overcharge detection delay time: 200ms~300ms (typical value 250ms)
• VDD-VSS operating voltage range: 1.5V~8V
• Allowable power consumption: 250mW
• Working temperature range: -40 ℃ to+85 ℃
The voltage detection accuracy of the chip is fully guaranteed within the temperature range of -5 ℃ to 55 ℃, ensuring consistent battery protection performance under different environmental conditions.
Typical Application Circuit Design
The application circuit design of CXLB7395 is simple and efficient, with the main peripheral components including:
Core component configuration
• Current limiting resistor (R1-5)：100Ω ~200Ω Used to stabilize VDD voltage and enhance ESD protection capability
• Transistor current limiting resistor (R6-10)Adjust according to the selected BJT parameters to ensure optimal working condition
• Leakage load resistor (R8-15)Reasonably choose the resistance value to avoid sudden changes in current during overcharging
• Filter capacitor (C1-5)：0.01μF~1.0μ F， Recommend using a typical value of 0.1μ F
• Balanced Control BJT (Q1-5)Using SS8050 NPN bipolar junction transistor
Key design considerations
• Selection of current limiting resistorThe resistance value should not be too large to avoid a decrease in detection voltage accuracy due to current consumption
• Optimization of transistor driveCarefully adjust the R6-10 resistance value based on specific BJT parameters to ensure optimal switching characteristics
• Leakage resistor configurationThe resistance value should not be too small to prevent excessive current from triggering the system protection when the battery is overcharged
• Requirements for filtering capacitorsThe capacitance value should not be less than 0.01 μ F to ensure the stability of VDD voltage and anti-interference ability
Detailed description of work status
Normal working condition
CXLB7395 continuously monitors the battery voltage connected between VDD and VSS, and intelligently controls the balancing action based on accurate voltage measurement results
• When the battery voltage exceeds the overcharge detection voltage (Vcu), the OUT terminal outputs a high level to drive the NPN-BJT to conduct
• When the battery voltage is lower than the overcharge release voltage (Vcr), the OUT terminal outputs a low level to turn off the NPN-BJT
Overcharging state and balance control mechanism
During the battery charging process, once the battery voltage exceeds the Vcu threshold and continues to exceed the detection delay time (Toc), the chip immediately enters an overcharge state and initiates balance control:
• OUT terminal level occurrence L→ H changes, turn on NPN-BJT, start balanced discharge
• When the battery voltage drops below the release voltage Vcr, the OUT terminal level experiences H→ L changes, turn off NPN-BJT
• This intelligent switch control ensures that the battery always operates within a safe voltage range
Energy saving management in standby mode
During the battery discharge process, when the battery voltage drops below the standby detection voltage (Vsb), the chip automatically enters standby mode:
• Reduce current consumption to standby level, minimizing system power consumption to the maximum extent possible
• Maintain basic voltage monitoring function and be ready to respond to charging needs at any time
Widely applicable fields
CXLB7395 is particularly suitable for the following high-end application scenarios:
• Multi cell lithium-ion rechargeable battery pack management system
• High end electric tool battery pack
• Industrial energy storage system battery balancing
• Electric vehicle auxiliary battery system
• Backup power supply for medical equipment
• Backup power supply for communication base stations
Packaging and supply guarantee
CXLB7395 adopts the standard SOT-23-6 package and provides two types of Tape& Reel packaging style, fully compatible with automated SMT production lines. JTM-IC provides a complete technical support system, including detailed data manuals, application notes, reference designs, and evaluation boards, to assist customers in quickly completing product design and mass production.
Professional technical support services
Choosing CXLB7395 not only provides a high-performance chip, but also gains access to JTM-IC's professional technical support team. We offer:
• Personalized technical consultation and solution evaluation
• Quick sample application and technical support response
• Comprehensive after-sales service and technological updates
Conclusion
CXLB7395 provides a professional balance management solution for multi cell lithium-ion battery packs with its excellent voltage detection accuracy, extremely low power consumption, and reliable balance control performance. Whether for consumer electronics products or industrial applications, this chip can effectively improve the overall performance, safety, and cycle life of battery packs, making it the preferred solution for battery management system design.
To learn more about CXLB7395 products, apply for samples, or obtain technical support, please visit the JTM-IC official website;jtm-ic.comOur professional technical team will provide you with comprehensive service support.
article authorJTM-IC Technical Team
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