CXLB73312 is a high-performance, multi-functional Ni-MH battery charge management integrated circuit, packaged in SOP8, suitable for 1 to 6 series Ni-MH battery packs. Through the configuration of external voltage divider resistor, the chip can adapt to the charging requirements of different battery numbers, and realize the intelligent management of the whole process from pre-charging, fast charging to current elimination charging. Its input power range is 5V/2A, the charging power is adaptive to 5-10W, and it has a 12-bit high-precision ADC, which can monitor the battery voltage and charging current in real time to ensure the safe and reliable charging process.
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[ CXLB73312 ]"
In modern electronic equipment, battery management and charging efficiency directly affect the performance and service life of the product. As a series charge management chip designed for Ni-MH batteries, CXLB73312 has become an ideal choice for all kinds of portable devices and energy storage systems due to its efficient charging strategy, flexible configuration options and comprehensive protection mechanism. This article will analyze the functional characteristics, working principle and application design of the CXLB73312 in depth to help engineers better understand and apply the chip and enhance product competitiveness.
1. CXLB73312 Overview
CXLB73312 is a high-performance, multi-functional Ni-MH battery charge management integrated circuit, packaged in SOP8, suitable for 1 to 6 series Ni-MH battery packs. Through the configuration of external voltage divider resistor, the chip can adapt to the charging requirements of different battery numbers, and realize the intelligent management of the whole process from pre-charging, fast charging to current elimination charging. Its input power range is 5V/2A, the charging power is adaptive to 5-10W, and it has a 12-bit high-precision ADC, which can monitor the battery voltage and charging current in real time to ensure the safe and reliable charging process.
2. Key Features and Benefits
· Multi-section tandem support: Support 1~6 Ni-MH batteries to charge in series, with a wide range of applications.
· Three-stage charging management: It has three stages of pre-charging, fast charging and current-eliminating charging to effectively extend battery life.
· Intelligent state judgment: Determine whether the battery is present, damaged or fully charged through voltage detection.
· LED status indication: Two-color LED (red/green) clearly displays the charging status, which is convenient for users to monitor.
· Overcurrent and short circuit protection: Built-in protection mechanism to prevent abnormal conditions from damaging the chip or battery.
· PWM control chargingThe PWM1 and PWM2 outputs respectively control the charging current and the boost charging process.
3. pin function details
The CXLB73312 has a total of 8 pins, each performing its own duties and working together to complete the charging management task:
· VDD (Pin 1): Power input, typical value is 5V.
· GND (pin 8): Ground terminal.
· LED_G (pin 2): Green LED control, used to indicate charging completion or normal status.
· LED_R (pin 4): Red LED control, used to indicate charging or abnormal status.
· CSEN (Pin 5): Charging current detection input, set the charging current through an external sampling resistor.
· VBAT (Pin 7): Battery voltage detection input, used to judge the battery status and charging stage.
· PWM1 (Pin 6): PWM output, control the charging current on and off.
· PWM2 (Pin 3)PWM output to control the boost charging process.
4. working principle and charging process
The CXLB73312 intelligently judges the battery status and adjusts the charging strategy by detecting the VBAT pin voltage and CSEN pin current in real time:
· No battery detection: When the VBAT voltage is lower than 0.3V or higher than 1.8V, it is judged that there is no battery.
· Bad battery judgment: The voltage is between 1.65V ~ 1.8V, or the voltage is still lower than 0.5V/1.0V after pre-charging, which is regarded as a bad battery.
· Pre-charge stage: When the voltage is 0.3V ~ 1.0V, precharge with small current at CSEN voltage of 12mV.
· Fast charge stage: After the voltage exceeds 1.0V, enter the fast charging mode, charge at half current for the first 1 minute, and then charge at full current with 100mV CSEN voltage.
· current elimination charging: When the battery voltage reaches 1.40V and the voltage drops or stabilizes for a long time, it will switch to current elimination charging 6mV the CSEN voltage to maintain the battery in a fully charged state.
5. external component configuration recommendations
In order to accommodate the charging needs of different battery numbers, the external voltage dividing resistors (R2 and R9) of the VBAT pins need to be configured as follows:
| Number of batteries | R2 (kΩ) | R9 (kΩ) |
|---|---|---|
| 1 | 0.51 | 33 |
| 2 | 15 | 15 |
| 3 | 20 | 10 |
| 4 | 27 | 9.1 |
| 5 | 20 | 5.1 |
| 6 | 20 | 3.9 |
In addition, the resistance of the sampling resistor (RSNS) determines the charging current. For example, when a 0.05 Ω resistor is used, the charging current is about 2000mA. Users can adjust the resistance according to the actual needs, flexible set the charging speed.
6. typical application scenarios
CXLB73312 are widely used in various types of Ni-MH battery charging equipment, including:
· Portable electric tools
· Household energy storage equipment
· Toys and remote controls
· Emergency lighting system
· Medical electronic equipment
Its high integration and simple peripheral circuit characteristics, greatly reducing the system design difficulty and cost.
7. epilogue
With its comprehensive charge management function, flexible configuration options and reliable protection mechanism, CXLB73312 provides an efficient and safe solution for Ni-MH battery charging system. Whether it is multi-cell series or single-cell charging, the chip is competent and is one of the best for engineers to design battery management systems. For more information about CXLB73312 technical information, sample application or purchase information, please visitJTM-IC official websiteGet the latest resources and support.
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