With the rapid development of portable electronic devices, power tools, energy storage systems and industrial backup power supplies, the demand for high-efficiency, high-reliability, high-current multi-cell lithium battery charging management chips is increasing. As a synchronous switching type high-efficiency lithium ion/lithium polymer battery charging management chip, CXLB7316D has the advantages of 8V ~ 60V wide input voltage range, maximum 10A charging current, flexible configuration of multiple batteries, etc. It is widely used in notebook computers, self-charging battery packs, independent chargers and various handheld devices. This article will systematically introduce the core characteristics of the CXLB7316D, working principle, typical applications and its technical advantages in the JTM-IC product system.
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[ CXLB7316D ]"
CXLB7316D: wide voltage, high current, multi-cell lithium battery intelligent charging management chip
With the rapid development of portable electronic devices, power tools, energy storage systems and industrial backup power supplies, the demand for high-efficiency, high-reliability, high-current multi-cell lithium battery charging management chips is increasing. As a synchronous switching type high-efficiency lithium ion/lithium polymer battery charging management chip, CXLB7316D has the advantages of 8V ~ 60V wide input voltage range, maximum 10A charging current, flexible configuration of multiple batteries, etc. It is widely used in notebook computers, self-charging battery packs, independent chargers and various handheld devices. This article will systematically introduce the core characteristics of the CXLB7316D, working principle, typical applications and its technical advantages in the JTM-IC product system.
1. Chip Overview and Product Positioning
CXLB7316D is a high-performance charge management chip designed for 2~10 lithium ion/lithium polymer batteries or 12V/18V/24V lead-acid batteries. The chip uses a TSSOP-20 package, integrated synchronous Buck architecture, high-precision voltage and current regulation, intelligent battery detection, multiple protection mechanisms and charging status indicator, with the following core features:
1.1. Wide input voltage range8V ~ 60V, adapt to a variety of adapters and industrial power environment;
1.2. High current output: The maximum charging current is 10A, supports fast charging of large-capacity battery packs;
1.3. Multi-battery flexible configuration：
· CXLB7316A:2/3/4 lithium battery
· CXLB7316B: Section 5/7/9 Lithium Battery
· CXLB7316C:6/8/10 lithium battery
· CXLB7316D:12V/18V/24V lead-acid battery;
1.4. High precision control: Charging voltage accuracy ± 0.5%, charging current accuracy ± 4%;
1.5. Full-featured integration: Pre-charge, constant current, constant voltage three-stage charging, support external resistor fine-tuning voltage and current;
1.6. Comprehensive Protection Mechanism: Overvoltage, undervoltage, short circuit, over temperature, Cycle-by-Cycle current limit, etc;
1.7. Intelligent status indicationDual LED output displays real-time charging status and fault type.
2. System Architecture and Pin Functions
The CXLB7316D adopts TSSOP-20 package, and the function of each pin is clear and clear, which is convenient for system design and layout:
· VCC(Pin 2): Power input, support 8V ~ 60V wide voltage input;
· CELL(Pin 5): Select the number of batteries, set the number of different batteries by grounding, floating or high;
· ISET(Pin 6): Charging current setting, external resistor to ground;
· SRP/SRN(Pin 10/9): Current detection positive/negative terminal, external 10mΩ detection resistor;
· STAT1/STAT2(Pin 19/20): Charging status LED output;
· HDR/LDR(Pin 17/14): High and low side switch tube drive, support synchronous Buck operation;
· TIM(Pin 11): External NTC thermistor for temperature monitoring and management.
3. charging process and working mechanism
The charging process of the CXLB7316D is divided into three stages:
3.1. Pre-charge phase
When the battery voltage is lower than 3V/cell (lithium battery) or 5.2V (lead acid), the chip is pre-charged with a small current (typically 20% × Icharge) to restore the deep discharge battery.
3.2. Constant current charging stage
After the battery voltage rises above the pre-charging threshold, it enters the constant current charging mode, and the charging current is set by the following formula:
Among them, RSNS is a 10mΩ detection resistor, and RISET is an ISET pin external resistor.
3.3. Constant voltage charging phase
When the battery voltage is close to the set cut-off voltage (such as 4.2V/section), switch to the constant voltage mode, the current gradually decreases. When the current drops to the cut-off current (10% x Icharge), charging is completed.
4. key features and technical highlights
4.1. Smart battery detection and wake-up
The chip has an intelligent battery insertion detection mechanism. When the battery is powered on or the battery voltage is lower than the recharge threshold, the detection process is automatically started, and the battery status is judged by the IDISCHRG1 and IWAKE current. If there is no battery, the standby mode is entered.
4.2. Temperature monitoring and protection
Support external NTC thermistor for high and low temperature protection:
· High temperature (VTHM < 0.2V): charging is suspended;
· Low temperature (VTHM > 1.45V): the charging current is reduced to 50%;
· Extremely low temperature (VTHM > 2.3V): The charging current is reduced to 20%.
4.3. Programmable charging time limit
The total charge time is set by the external capacitor of the TTC pin:
The precharge time is 1/8 of the total time, and the timeout enters the fault state and is indicated by STAT2.
4.4. Constant voltage output fine adjustment
Through the VTRIM pin external resistor, the constant voltage output can be fine-tuned:
· Lithium battery:
· Lead-acid batteries:
4.5. Multiple protection mechanisms
· Overvoltage/Undervoltage Protection: VCC overvoltage threshold 63V, undervoltage threshold 8V;
· Cycle-by-Cycle限流: PWM will be turned off immediately when the detected resistance voltage exceeds 130mV;
· Refresh pulse: Ensure that the voltage of the bootstrap capacitor is sufficient to maintain the driving capability;
· over-temperature protection: Stop charging when junction temperature exceeds 160 ℃ and resume after falling to 140 ℃.
5. typical application scenarios
The CXLB7316D is suitable for a variety of high-power, multi-cell battery charging systems, including:
· Industrial Power Tools & UAV Battery Pack
· Laptops and Portable Workstations
· Energy Storage System and Backup Power Supply
· Electric Bicycle and Scooter
· Medical Equipment and Mobile Communication Terminal
Its high integration, high reliability and flexible configurability make it an ideal charging management solution for high-power portable devices and industrial systems.
6.Typicalapplication circuitand BOM recommendations
SevenJTM-IC and CXLB7316D
As a JTM-IC representative product in the field of high-power power management, the CXLB7316D reflects the company's technical accumulation in wide-voltage input, high-current output, and multi-cell battery management. The JTM-IC is committed to providing customers with full-process technical support from chip selection, reference design to system debugging, helping customers improve product competitiveness and market response speed.
For more information about CXLB7316D and other high-performance power management chips, please visit JTM-IC official website:jtm-ic.comOr contact our technical team.
Eight, the article summary：
CXLB7316D is an efficient and high-precision charging management chip suitable for multi-cell lithium batteries and lead-acid batteries. It has the advantages of wide voltage input, high current output, intelligent protection and flexible configuration. As the authorized supplier of the chip, JTM-IC provides complete technical support and solutions to help customers realize efficient and safe battery charging system design.
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