With the wide application of portable electronic devices, efficient, safe and intelligent battery charging management chips have become the core components of various handheld devices, mobile instruments and chargers. As a switch type multi-cell lithium ion/lithium polymer and lead-acid battery charging management chip, CXLB73318 integrates high-precision voltage and current regulation, pre-charge control, charging status indication and multiple protection functions, and is widely used in various types of portable equipment charging management system. This article will provide an in-depth introduction to CXLB73318 features, working principles, application scenarios and its advantages in the JTM-IC product system.
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[ CXLB73318 ]"
CXLB73318 multi-cell battery charging management chip: efficient, safe and intelligent charging solution
With the wide application of portable electronic devices, efficient, safe and intelligent battery charging management chips have become the core components of various handheld devices, mobile instruments and chargers. As a switch type multi-cell lithium ion/lithium polymer and lead-acid battery charging management chip, CXLB73318 integrates high-precision voltage and current regulation, pre-charge control, charging status indication and multiple protection functions, and is widely used in various types of portable equipment charging management system. This article will provide an in-depth introduction to CXLB73318 features, working principles, application scenarios and its advantages in the JTM-IC product system.
Overview and main characteristics of 1. chip
CXLB73318 is a switching charge management chip designed for 1 to 4 cell Li-ion/Li-polymer batteries or 1 to 2 cell lead-acid batteries. In a MSOP-10 package, the chip integrates a PWM controller, high-precision voltage and current regulators, pre-charge management, charge status indication, and multiple protection mechanisms, with the following outstanding features:
· Wide battery compatibility: Support 2 to 4 lithium ion/lithium polymer batteries, and 2 lead-acid batteries;
· High precision control: The charging voltage control accuracy is ± 0.5%, and the constant voltage value can be adjusted by external resistor;
· Programmable charging current: Constant current charging current is flexibly set by external resistor;
· Intelligent charging management: With pre-charge, constant current, constant voltage three-stage charging process;
• Comprehensive protection mechanisms: Integrated overvoltage protection, short circuit protection, temperature detection, charging timeout protection, etc;
· Status indication: Real-time display of charging status through STAT1/STAT2 dual LED output;
· Wide working range: Input withstand voltage up to 20V, working temperature -20 ℃ ~ 70 ℃.
The CXLB73318 also offers a variety of model options, including B/C/D/F versions for different battery configurations to meet a variety of application needs.
2. working principle and charging process
The charging process of the CXLB73318 is divided into three stages:Pre-charge (Pre-charge),Constant current charging (CC)andConstant voltage charging (CV).
2.1. Pre-charge phase
When the battery voltage is lower than the set threshold (such as a single lithium battery <3V), the chip is pre-charged with a small current to avoid damage caused by deep discharge of the battery.
2.2. Constant current charging stage
After the battery voltage rises above the pre-charge threshold, the chip enters a constant current charging mode, and the charging current is set by the external detection resistor (RSNS) and the ISET pin resistance.
2.3. Constant voltage charging phase
When the battery voltage is close to the set cut-off voltage, the chip switches to the constant voltage mode, and the current gradually decreases until the cut-off condition is reached.
During the charging process, the chip continuously monitors the battery temperature, voltage and current. Once an abnormality is detected (such as overvoltage, overtemperature, short circuit), it immediately enters the protection state and indicates the fault type through the LED.
Detailed explanation of 3. key functions
3.1. Charging current and voltage setting
The constant current charging current is calculated by the following formula:
Among them, VISET is 1V in the constant current stage and 0.2V in the pre-charge stage. Users can adjust the RSNS and RISET resistance values according to actual needs, and flexibly set the charging current.
The constant voltage charging voltage can be fine-tuned through the external resistor of VTRIM pin. For the specific formula, please refer to page 13 of the technical document.
3.2. Battery temperature detection
The chip supports an external NTC thermistor for temperature monitoring. When the NTC pin voltage is below 200mV (high temperature) or above 1.23V (low temperature), charging is suspended until the temperature returns to normal. If temperature detection is not required, ground the NTC pin.
3.3. Charging state indication
STAT1 (green light) and STAT2 (red light) provide five status indications:
· off/off: no battery or sleep mode
· off/on: charging
· On/off: charging completed
· KILLAGE/0.5Hz PULSE: OVERTIME OR OVERVOLTAGE FAULT
· Off/2Hz pulse: charging pause (such as abnormal temperature)
4. Intelligent battery detection and timeout recovery
The chip has an intelligent battery detection function, which can determine whether the battery exists and its status. After a timeout error occurs, the chip can automatically perform a recovery procedure based on whether the battery voltage is higher than the recharge threshold (VRCH), or clear the error through a power-on reset.
4. typical application scenarios
The CXLB73318 is suitable for a variety of portable devices and charging systems, including:
· Hand-held electric tools
· Mobile Medical Equipment
· Portable audio and drone
· Lead-acid battery charger
· All kinds of lithium battery backup power system
Its high level of integration, reliability and flexible programmability make it an ideal charge management solution for industrial and consumer electronics.
5.Typicalapplication circuitand BOM recommendations
Six, the package and pin function description
SevenJTM-IC and CXLB73318
As one of the JTM-IC's core power management products, CXLB73318 reflects the company's technical accumulation in high-performance, high-reliability chip design. JTM-IC are committed to providing customers with complete power management solutions, including technical support, reference designs and customization services. For more information about CXLB73318 and other products, please visit the official websitejtm-ic.comOr contact our technical team.
Eight, the article summary：
CXLB73318 is a multi-battery charging management chip with comprehensive functions and superior performance, which is suitable for charging systems of various portable devices. Its high-precision control, multiple protection mechanisms and flexible programmability make it ideal for industrial and consumer electronics. As a supplier of this chip, JTM-IC provides professional technical support and complete solutions to help customers improve product competitiveness.
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