Efficient and safe battery charge management is key in modern electronics. CXLB73304 is a buck-boost charging management chip designed for 1 to 6 lithium batteries. It supports 4.5V to 24V wide voltage input and integrates a variety of fast charging protocols. It is suitable for a variety of application scenarios from portable devices to industrial tools. This article will analyze the core features, working principles and application advantages of the chip in depth to help engineers and purchasers fully understand its technical value.
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[ CXLB73304 ]"
CXLB73304 buck-boost charging management chip: efficient, safe, multi-functional power management solution
Efficient and safe battery charge management is key in modern electronics. CXLB73304 is a buck-boost charging management chip designed for 1 to 6 lithium batteries. It supports 4.5V to 24V wide voltage input and integrates a variety of fast charging protocols. It is suitable for a variety of application scenarios from portable devices to industrial tools. This article will analyze the core features, working principles and application advantages of the chip in depth to help engineers and purchasers fully understand its technical value.
1. Chip Overview and Core Features
CXLB73304 is a high-performance synchronous rectifier buck-boost charging management chip with the following outstanding features:
· Wide voltage input range: Support 4.5V ~ 24V input, compatible with multiple power adapters.
· Multi-cell battery supportFlexible configuration of 1~6 lithium batteries to meet the needs of different equipment.
· Fast charge protocol support: Built-in USB fast charging protocol identification (D /D-communication), compatible with mainstream fast charging standards.
Multiple protection mechanisms: Including input overvoltage/undervoltage protection, battery overvoltage/short circuit protection, temperature protection (JEITA standard), charging timeout protection, etc.
· Intelligent status indicationDual LED indicator, support charging status and battery power display.
· High integration and peripheral simplificationUsing SOP16 package, the peripheral circuit is simple, supports external MOSFET to meet different power requirements.
2. detailed function analysis
2.1. Input and output management.
· Input voltage range4V ~ 24V, with input undervoltage lockout (UVLO) and overvoltage protection (OVP) to ensure safe operation of the system under abnormal input conditions.
· Output voltage configuration: Set the full charge voltage of the battery through the VBM pin, and support various battery types such as 4.2V/4.35V (lithium ion) or 3.6V (lithium iron phosphate).
2.2. Charging process and control
CXLB73304 divide the charging process into four stages:
2.2.1. Short circuit mode: Try to activate the battery with a small current (10% ICC), and stop charging if it does not recover within 30 minutes.
2.2.2. Pre-charge mode: When the battery voltage is lower than the transition voltage (VTKK), precharge with 20% ICC.
2.2.3. Constant current mode: After the battery voltage is normal, it enters constant current charging, and the inductor current ripple is controlled at ± 20%.
2.2.4. Constant pressure mode: When the battery is close to full charge, it turns to constant voltage charging until the current drops to the set threshold.
2.3. Temperature protection compatible with JEITA
The chip supports JEITA standard, monitors the battery temperature in real time through an external NTC resistor, and dynamically adjusts the charging current and voltage:
· 0°C ~ 10°C: Charge current drops to 50% ICC
· 10°C to 45°C: full current charging
· 45°C ~ 60°C: gradually reduce the charging voltage
· Over 60°C or below 0°C: Stop charging
2.4. Status indication and user interface.
· LDM pin floating: Display the charging status (red light charging, blue light full, double light abnormal alarm).
· LDM Pin Ground: Display the battery level (four-light ticker mode), and automatically switch back to the charging state after 2 seconds.
3. typical application scenarios
CXLB73304 are widely used in the following areas:
· Bluetooth speakers and portable devices: Support multiple batteries in series to improve endurance and output power.
· Electric toolsWide voltage input and high power output (max. 30W) to meet high load requirements.
· Printer and emergency lightingStable buck-boost architecture adapts to variable input voltages.
· Industrial Equipment:-40°C ~ 85°C operating temperature range, suitable for harsh environments.
4. Encapsulation and Electrical Characteristics
4.1. Encapsulation type: SOP16-E, in line with environmental standards, pin definition is clear, easy to weld and debug.
4.2. Electrical parameters：
· VCC output: 5V ± 10%
· Quiescent current: BAT end 10μA,VIN end 250μA
· Inductor current detection voltage: 40mV ~ 50mV (according to the input voltage range adjustment)
· Drive voltage: 5V for NMOS, VBAT-5V V for PMOS
5. Typical Application Schematic Diagram and BOM
SixWhy choose CXLB73304?
With its highly integrated, flexible configuration options and comprehensive protection mechanism, CXLB73304 is an ideal choice for multi-cell lithium battery charge management. Whether developing a new generation of portable devices or upgrading existing power systems, the chip provides an efficient, reliable and safe charging solution.
Seven, about JTM-IC
JTM-IC (official website:jtm-ic.com) Focus on the development and sales of high-performance power management chips, providing customers with full-process services from selection to technical support. CXLB73304 is one of our recommended medium and high power charging management chip, welcome to visit the official website for more product information and technical information.
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