CXLB73283 is a high-efficiency synchronous buck converter specially designed for lithium battery charging. The input voltage range covers 5V to 12V. It has built-in Type-C PD, Huawei FCP, Samsung AFC, MTK PE 1.1/2.0 and other mainstream fast charging protocols. The chip can automatically apply for 9V or 12V high voltage input according to the adapter capability, significantly shortening the charging time and improving the user experience.
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[ CXLB73283 ]"
CXLB73283: an efficient multi-protocol synchronous buck charging IC comprehensive analysis
In the context of the increasing popularity of mobile devices and portable electronic products, efficient, intelligent and safe power management chips have become an indispensable part of product design. As a high-efficiency synchronous buck charging IC with integrated MOS and multiple fast charging protocols, CXLB73283 is widely used in Bluetooth speakers, POS machines, electronic cigarettes and other equipment with its excellent performance and rich functions. This article will analyze the technical characteristics, application scenarios and design points of the CXLB73283 in depth to help engineers better understand and select the chip.
1. Product Overview
CXLB73283 is a high-efficiency synchronous buck converter specially designed for lithium battery charging. The input voltage range covers 5V to 12V. It has built-in Type-C PD, Huawei FCP, Samsung AFC, MTK PE 1.1/2.0 and other mainstream fast charging protocols. The chip can automatically apply for 9V or 12V high voltage input according to the adapter capability, significantly shortening the charging time and improving the user experience.
Main characteristics of 2.
2.1. Wide input voltage range and high conversion efficiency
· Input voltage: 5V ~ 12V
· The highest efficiency is 94%(5V input) and 93%(12V input), which effectively reduces heat generation and improves system stability.
2.2. Multi-protocol fast charge support
· Support Type-C PD, Huawei FCP, Samsung AFC, MTK PE and other protocols, strong compatibility.
· It can intelligently identify the adapter type and dynamically adjust the charging strategy.
2.3. Flexible current and voltage settings
· The charging current (input or battery side) is set via an external resistor on the ICHGSET pin.
· Set the battery full voltage (4.2V/4.35V/4.4V/4.5V) through the VSET pin to adapt to different lithium battery types.
2.4. Comprehensive protection mechanisms
· Input overvoltage/undervoltage protection
· NTC Temperature Protection (0°C ~ 55°C Operating Range)
· Charging timeout protection (up to 24 hours)
· IC over-temperature protection (135°C shutdown, 85°C recovery)
2.5. Intelligent LED indication with I2C interface
· Support 1~2 LED automatic identification and status display
· Provide I2C interface, support register configuration and status reading, enhance system controllability.
3. typical application scenarios
♦ Bluetooth speaker
The CXLB73283 supports high current fast charging, can be in a short time for the speaker battery is fully charged, while its high efficiency conversion reduces energy consumption, suitable for portable audio equipment.
♦ POS machine
In the mobile payment scenario, the POS machine needs to have fast charging and stable power supply capabilities. CXLB73283 multi-protocol compatibility and high reliability make it an ideal choice.
Electronic Cigarettes
Electronic cigarette equipment requires high charging safety and efficiency. The CXLB73283 has NTC temperature protection and overvoltage protection to ensure the safe and controllable charging process.
Key Points and Precautions of 4. Design
4.1. Current setting mode
· Standard Edition (CXLB73283): Set via ICHGSET pinInput current, the resistance value corresponds to the current gear (e. g. 51K = 1.0A).
· IBAT版（CXLB73283_IBAT）: SettingsBattery terminal current, Suitable for scenarios where precise control of battery current is required.
· 18W version (CXLB73283_18W): Fixed input current (5V/3A, 9V/2A, 12V/1.5A), suitable for power-limited devices.
4.2. Battery voltage setting
By connecting different resistors to the LED3(VSET) pin, the full voltage of the battery can be set, and various lithium battery specifications of 4.2V ~ 4.5V can be supported.
4.3. NTC temperature protection
· The NTC pin needs to be connected to a thermistor to monitor the battery temperature.
· If there is no NTC requirement, it is recommended to use 51K resistor grounding to avoid abnormal pin floating.
4.4. PCB Layout Recommendations
· The VSYS capacitor should be as close to the chip pin as possible to reduce the loop area.
· Use a wide copper tape to connect the VSYS pin to ensure a clear current path.
· The EPAD at the bottom of the chip needs to be well grounded to enhance thermal and electrical performance.
5. I2C Control and Register Configuration
CXLB73283 I2C communication is supported, the device address is 0xEA (write)/0xEB (read). Configurable through registers:
· Charging enable (SYS_CTLI)
· Charging current at each voltage level (CHG_ISET_5V V/7V/9V/12V)
· NTC Protection Threshold (CHG_NTC)
· PD Protocol Maximum Request Voltage (PD_SINK_MAX)
Attention: When I2C reads data, the last byte needs to send a NACK signal, otherwise it may cause a bus exception.
6. Typical Application Schematic Diagram and BOM
Seven, package and pin function
8. Summary
With its high integration, multi-protocol compatibility, flexible configuration and comprehensive protection, CXLB73283 has become the preferred solution for portable device power management. Whether in audio equipment, mobile terminals or smart hardware, its excellent performance and reliability can empower products and enhance overall competitiveness.
For more technical information, sample application or design support, please visitJTMIC official website (jtm-ic.com）Or contact our technical support team.
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