With the increasing popularity of single lithium battery power supply equipment, charging management chips not only need high efficiency and precision, but also need to show excellent reliability in complex application environments. Especially in the car charger, industrial equipment, and the use of non-standard adapter occasions, input voltage fluctuations, surge and even misconnected reverse connection, may cause fatal damage to the charging circuit. JTM-IC(jtm-ic.com) deeply understood this challenge and launched CXLB73336 -- a high-performance linear charge management chip integrating 16v overvoltage protection (OVP) and battery/input dual reverse connection protection, it provides a safe, stable and flexible charging solution for 4.2V standard single lithium ion batteries.
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[ CXLB73336 ]"
CXLB73336: high reliability single lithium battery charging IC with 16v OVP and double reverse connection protection
With the increasing popularity of single lithium battery power supply equipment, charging management chips not only need high efficiency and precision, but also need to show excellent reliability in complex application environments. Especially in the car charger, industrial equipment, and the use of non-standard adapter occasions, input voltage fluctuations, surge and even misconnected reverse connection, may cause fatal damage to the charging circuit. JTM-IC (jtm-ic.com) deeply understand this challenge and launchCXLB73336-- A collection16v overvoltage protection (OVP)AndBattery/input double reverse connection protectionThe integrated high-performance linear charging management chip provides a safe, stable and flexible charging solution for 4.2V standard single lithium ion batteries.
First, the core highlight of the product: born for a complex environment
On the basis of inheriting the classic charging management function, CXLB73336 focuses on strengtheningInput tolerance and system-level protectionTo adapt to more rigorous application scenarios.
1.1. 16v overvoltage protection (OVP), calmly deal with voltage surge
This is a key feature CXLB73336 different from ordinary charging IC. Its input can withstand up25V absolute maximum voltage, and built-in accurate OVP circuit. When the input voltage exceeds16V (typical)When, the chip immediately enters the shutdown protection mode, cutting off charging, effectively preventing high voltage surge from damaging the internal circuit. When the voltage falls back to the safe range (about 15V), the chip automatically resumes its work. This feature makes it very suitable for use inCar Charger, open power adapterScenarios where voltage may be unstable.
1.2. Dual hardware reverse connection protection to prevent human misoperation
· Battery reverse connection protection: When the positive and negative poles of a single lithium battery are accidentally connected to the BAT pin, the chip immediately turns off the output, and the reverse leakage current is extremely low (<5mA), and the LED indicator light is slightly light status indicating failure, protect the battery and charging circuit from damage.
· Input power reverse connection protection: When the adapter or USB power cord is connected to the Vcc pin in reverse, the chip also enters the protection state, the leakage current is less than 10μa, and the indicator light is off. After the connection is correct, the charging is automatically restored.
These two protections fundamentally eliminate the risk of equipment damage caused by wiring errors and improve the robustness and user-friendliness of the product.
1.3. Wide input voltage range and accurate 4.2V charging
CXLB73336 support4.2V to 25VWide input voltage range, perfectly compatible with 5V USB power supply, 9V/12V and other common adapters. It uses advancedTrickle, constant current, constant voltage (TC/CC/CV)Three-stage charging algorithm, the final float-charge pressure is accurate and stable4.2V (accuracy ± 1%)To ensure the safe and full battery and prolong its service life. The charging current can pass through a single external resistor3mA to 500mAFlexible programming settings.
Second, intelligent management and convenient design
2.1 intelligent thermal regulation and charging management
Chip integrated thermal feedback loop, when the junction temperature is close150 ℃Automatically and linearly reduce the charging current to prevent overheating, allowing a larger current to be set in a typical environment. After the charging is completed, the standby mode is automatically entered. The static current is only 140μa, and the battery voltage is continuously monitored. When the voltage drops (corresponding to about 80%-90% power), the charging is automatically turned on, keep the battery in the best condition at all times.
2.2. Complete status indication
Providing open-drain outputCHRG (charging)AndSTDBY (full)The status pin can directly drive LED or connect to MCU, clearly indicating various states such as charging, full charge, failure (reverse connection, overvoltage, undervoltage) and battery-free. Human-computer interaction is intuitive.
2.3. Simple external components
AdoptSOT23-6Ultra-small package, typical applications only need3 External Components(Input and output capacitance, set resistance), greatly saving PCB space and BOM cost, is an ideal choice for portable devices.
III. Working principle and Application Design Guide
The CXLB73336 internal intelligent controller manages the entire charging process. The designer only needs simple configuration.
3.1. Charging current setting formula:
Select the resistor RPROG connected between the PROG pin and ground according to the target charging current (IBAT):
·When IBAT ≤ 0.1A: RPROG = 1100 / IBAT
·When IBAT> 0.1A: RPROG = 950 / IBAT
For example, to set the charging current of 500mA, RPROG should choose 1.91 kΩ (typical value). JTM-IC official website (jtm-ic.com) provide detailed measured data tables for engineers to design reference.
3.2. Key application circuit design points:
3.2.1 input filtering and protection circuit: to achieve the best surge resistance and OVP effect, we strongly recommend that you connect one in series at the Vcc input.1Ω small resistanceParallel4.7. F or above, X5R/X7R materialCeramic Capacitors to the ground. The capacitor must be placed close to the chip pin.
3.2.2. Output capacitance: Place one near the BAT pin10μF Ceramic CapacitorTo stabilize the output voltage and filter out noise.
3.2.3. Heat dissipation design: pay attention to the heat dissipation of SOT23 package when charging 500mA high current. Optimizing PCB layout is the key: expand the chip as much as possibleCopper foil area of GND pin and adjacent area, and use a Via to connect it to the internal or back power layer to assist in heat dissipation. For continuous high current applications, you can consider adding one in the Vcc path.0.1Ω to 0.5Ω power resistanceAs an auxiliary heat dissipation element.
3.2.4. Status indicator circuit: CHRG and STDBY pins can be connected to LED through 1 kOhm current limiting resistor. You can select the BAT pin connection capacitor (no battery flicker indication) or 100K resistor to Vcc (no flicker indication) as required.
IV. Wide application fields
CXLB73336 high reliability, wide voltage adaptability and complete protection make it an excellent choice for the following applications:
·Vehicle-mounted electronics: car charger, driving recorder, GPS navigator, car air purifier.
·Industrial and security protection equipment: portable detector, data collector, wireless sensor node, security camera.
·Consumer electronics: Bluetooth speakers, smart home devices, electronic toys, Personal Care Appliances (such as shavers).
·Communication equipment: walkie-talkie, 4G/5G module standby power supply, IoT terminal.
·General charge management: all devices that use a single 4.2V lithium ion/polymer battery.
5. Packaging and pin functions
6. Typical applications:
Seven,Related productsmore...
8. Why did you choose JTM-IC CXLB73336?
In today's increasingly complex power environment, CXLB73336 provides not only a charging function, but also a setSystem-level power Security Solution. Its16v OVP protectionMake the equipment safe and sound when facing the shock of inferior adapter or vehicle-mounted Cold Start voltage;Double Reverse connection protectionAfter-sales risks caused by operational errors are completely eliminated. These features significantly reduce the difficulty of system design and improve the market competitiveness of terminal products.
If you are looking for a charging management chip for your single lithium battery device that can not only cope with harsh power environment, but also has high safety and high integration, CXLB73336 is undoubtedly your reliable partner.
Access NowJTM-IC official website (jtm-ic.com), obtain the complete data Manual, application circuit diagram, PCB layout guide and sample application information of CXLB73336. Our technical support team is ready to help you complete the design and help your products stand out in the market.
Attention: This article is written based on product public materials and is used for technology promotion and SEO optimization. For specific design, please use JTM-IC (jtm-ic.com) The latest official technical documents issued shall prevail and be fully verified by physical tests.
