CXLB7393 is a dedicated chip with built-in high-precision voltage detection circuit and delay circuit, specifically designed for charging balance control of single lithium-ion batteries in multi cell battery packs. This chip monitors the voltage status of each battery in real-time, intelligently controls the charging and discharging process, ensures voltage balance among individual cells in the battery pack, thereby extending the overall service life of the battery pack and improving safety.
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[ CXLB7393 ]"
CXLB7393: High precision multi cell lithium battery pack balancing management chip
With the rapid development of electric vehicles, energy storage systems, and portable electronic devices, the safety and cycle life of multi cell lithium battery packs have become a focus of industry attention. CXLB7393, as a single lithium-ion battery charging balance control chip designed specifically for multi cell battery packs, provides a reliable balancing solution for battery management systems with its high-precision voltage detection, ultra-low power consumption, and compact packaging.
Product Overview
CXLB7393 is a dedicated chip with built-in high-precision voltage detection circuit and delay circuit, specifically designed for charging balance control of single lithium-ion batteries in multi cell battery packs. This chip monitors the voltage status of each battery in real-time, intelligently controls the charging and discharging process, ensures voltage balance among individual cells in the battery pack, thereby extending the overall service life of the battery pack and improving safety.
The chip adopts advanced circuit design, 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, greatly reducing system power consumption. Its wide working temperature range (-40 ℃ to+85 ℃) ensures stable operation even in harsh environments, meeting the requirements of industrial grade applications.
Core Features and Advantages
High precision voltage detection
CXLB7393 integrates high-precision voltage detection circuit, providing multiple voltage threshold protection:
• Overcharge detection voltage range: 3.200~4.00V, accuracy up to± 25mV
• Overcharge release voltage range: 3.000~4.00V, 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=3.2V)
• Standby mode: maximum value 0.5μ A (VDD=2.0V)
• Low power consumption characteristics are particularly suitable for portable devices that require long-term standby
Flexible MOSFET driver configuration
CXLB7393 offers two output configuration versions to meet different system architecture requirements:
• CXLB7393-xxxA seriesDrive N-MOSFET, OUT output status L→ H is effective
• CXLB7393-xxxB seriesDrive P-MOSFET, OUT output status H→ L is effective
Compact packaging and environmental certification
• Adopting SOT-23-6 small package to save PCB space
• Compliant with halogen-free green environmental standards and RoHS requirements
Electrical characteristics and performance parameters
CXLB7393 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)
• OUT terminal output high voltage: VDD-0.02V (typical value)
• OUT terminal output low voltage: 0.1V (typical value)
• Allowable power consumption: 250mW
The voltage detection accuracy of the chip is guaranteed within the temperature range of -5 ℃ to 55 ℃, ensuring reliable battery protection under different environmental conditions.
Typical Application Circuit
The application circuit design of CXLB7393 is simple and efficient, and the main peripheral components include:
• Current limiting resistor (R1-5)：100Ω ~200Ω Used to stabilize VDD voltage and enhance ESD protection
• Filter capacitor (C1-5)：0.01μF~1.0μ F， Recommend using a typical value of 0.1μ F
• Balanced Control MOSFET (Q1-5)Choose N-MOSFET or P-MOSFET based on chip model
• Leakage resistor (RB1-5)Reasonably choose the resistance value to avoid charging overcurrent phenomenon
Design considerations
• The current limiting resistor value should not be too large, otherwise it will affect the accuracy of the detection voltage and may cause the voltage between VDD-VSS terminals to exceed the limit
• The leakage resistance value should not be too small to prevent excessive charging current when the battery voltage exceeds the overcharge detection voltage
• The filtering capacitor value should not be less than 0.01 μ F to ensure stable VDD voltage
Work status description
Normal working condition
CXLB7393 continuously monitors the battery voltage between VDD and VSS, and controls the balancing action based on the voltage status:
• When the battery voltage exceeds the overcharge detection voltage (Vcu), the OUT terminal outputs the corresponding level to control the MOSFET to conduct
• When the battery voltage is lower than the overcharge release voltage (Vcr), the OUT terminal outputs the opposite level to turn off the MOSFET
Overcharging state and balance control
During the charging process, once the battery voltage exceeds Vcu and continues to exceed the detection delay time (Toc), the chip enters an overcharge state and initiates balance control:
• A-series chipsDrive N-MOSFET, OUT level L→ H changes to turn on MOSFET
• B-series chipsDrive P-MOSFET, OUT level H→ L changes to turn on MOSFET
When the battery voltage drops below the release voltage Vcr, the chip will correspondingly turn off the MOSFET and stop the balancing action.
standby mode
During the discharge process, when the battery voltage drops below the standby detection voltage (VsB), the chip enters standby mode, reducing the current consumption to standby level and maximizing energy savings.
Application field
CXLB7393 is particularly suitable for the following application scenarios:
• Multi cell lithium iron phosphate rechargeable battery pack
• Electric Tool Battery Management System
• Energy storage system battery balance
• Electric bicycle/motorcycle battery pack
• Industrial backup power system
Packaging and Supply Information
CXLB7393 adopts the standard SOT-23-6 package and provides Tape& Reel packaging form, suitable for automated production lines. JTM-IC provides complete technical documentation, application notes, and reference designs to assist customers in quickly completing product development and mass production.
Conclusion
CXLB7393 provides a professional balanced management solution for multi cell lithium battery packs with its high precision, low power consumption, and reliability. Whether for lithium iron phosphate battery packs or other lithium-ion battery packs, this chip can effectively improve the overall performance and cycle life of the battery pack, making it an ideal choice for battery management system design.
For more product information, sample requests, or technical support about CXLB7393, please visit the JTM-IC official website;jtm-ic.comOur technical team will provide you with professional support.
article authorJTM-IC Technical Team
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