With the continuous improvement of power performance requirements for smart devices, high-efficiency, high-integration, multi-protocol compatible power management chips have become the core of various portable devices and energy storage systems. As a lithium battery charge and discharge management chip integrating multiple fast charging protocols and synchronous buck-boost converter, CXLB73327 not only supports input and output power up to 140W, but also has a wide range of battery types and string number adaptation capabilities, providing an ideal solution for high-performance power supply design. This article will comprehensively introduce the functional characteristics, system structure, working mode and typical applications of the CXLB73327, helping engineers to achieve more intelligent and efficient power system design.
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[ CXLB73327 ]"
With the continuous improvement of power performance requirements for smart devices, high-efficiency, high-integration, multi-protocol compatible power management chips have become the core of various portable devices and energy storage systems. As a lithium battery charge and discharge management chip integrating multiple fast charging protocols and synchronous buck-boost converter, CXLB73327 not only supports input and output power up to 140W, but also has a wide range of battery types and string number adaptation capabilities, providing an ideal solution for high-performance power supply design. This article will comprehensively introduce the functional characteristics, system structure, working mode and typical applications of the CXLB73327, helping engineers to achieve more intelligent and efficient power system design.
1. chip overview and core technology characteristics
CXLB73327 is a highly integrated synchronous buck-boost charge and discharge management chip with built-in complete AFC, FCP, SCP, PD2.0/3.0/3.1, QC2.0/3.0/3.0 and other mainstream fast charging protocols, which supports intelligent identification and power negotiation of Type-C interfaces. Its core features include:
· Support 2/3/4/5/6 series lithium batteries or lithium iron phosphate batteries, battery type and string number can be flexibly set through external resistors;
· Charge and discharge power up to 140W, charging efficiency up to 96%;
· Integrated synchronous buck-boost drive, only a single inductor can achieve two-way energy flow;
· Built-in 14-bit high-precision ADC, real-time monitoring of input and output voltage, current and battery status;
· Support 4/2/1 LED power indication, with rich status display mode;
· Standby power consumption as low as 5μA, support EN wake-up and key control;
· Comprehensive protection mechanism, including input over-voltage/under-voltage, output over-current/short-circuit, battery over-charge/over-discharge/over-current, IC over-temperature and NTC temperature protection;
· QFN5 × 5-40 package, compact structure, excellent heat dissipation performance.
2. System Structure and Pin Function
CXLB73327 integrated BUCK-BOOST controller, Type-C PD protocol module, multi-channel ADC, GPIO control and temperature detection circuit, the system structure is highly integrated. Its key pins include:
· VBUS/VBUSG/VBUSIInput power detection and path control;
· CSP1/CSN1、CSP2/CSN2Input/output current sampling;
· LX1/LX2、HG1/HG2、LG1/LG2: Buck-Boost power node and drive;
· BAT: Battery connection end;
· CC1/CC2 、 dpc/dmc: Type-C protocol communication and fast charge identification;
· GPIO(GP100-GP104)For battery quantity, power, voltage, NTC and LED configuration;
· EN: enable and wake control.
3. charge and discharge management mechanism
3.1. Charging management
The CXLB73327 supports complete current elimination & rarr; constant current & rarr; constant voltage & rarr; cut-off & rarr; recharging process:
· current elimination charging: When the battery voltage is lower than 2.5V, pre-charge with a small current of about 50mA; Charge with a current of about 200mA between 2.5V and the current elimination threshold;
· constant current charging: After the battery voltage exceeds the current elimination threshold, perform fast charging according to the set current;
· constant voltage charging: When the battery voltage is close to the set full voltage, it turns to the constant voltage stage, and the current gradually decreases;
· Charge cut-off and recharging: When the current is lower than the termination current (typically 100mA) and lasts for a certain period of time, stop charging; if the battery voltage falls below the set value, automatically restart charging.
The chip can automatically apply for the best voltage and current according to the identified charger type (such as PD, AFC, FCP, SCP, etc.) to realize intelligent adaptation.
3.2. Discharge management
In discharge mode, the CXLB73327 supports a variety of fast charging protocol outputs, including PD2.0/3.0/3.1, QC2.0/3.0/3.0, FCP, AFC, SCP, Apple 2.4A, etc. It has eMarker cable identification capability and can dynamically adjust the output strategy according to cable specifications. Its Try.SRC function can be used as a power output first when connecting DRP devices, improving user experience.
4. flexible system configuration
Key parameter settings are CXLB73327 via external resistors:
· PSET Pin: Set the maximum input and output power of the system (30W ~ 140W);
· BAT_NUM Pin: Set the number of batteries in series (2~6);
· VSET Pin: Set the full voltage of a single battery (3.65V/4.1V/4.2V/4.35V/4.4V);
· NTC Pin: Connect thermistor to realize temperature protection and support dynamic current switching detection mechanism.
5. power display and user interaction
The chip supports multiple LED display modes:
· 4 lamp modes: Accurately display the power status of 25% first gear, and the charge and discharge status indication is clear;
· 2 lamp modes: Support two-color lamp and monochrome lamp configuration, adapt to different product structure;
· 1 Lamp mode: Indicate status with flashing frequency, suitable for minimalist design.
Through the EN pin can realize the boot, shutdown, wake-up and system reset function, support short press, long press and double-click operation, user interaction is flexible and convenient.
6. comprehensive protection mechanisms
CXLB73327 with multiple security protections:
· Input overvoltage/undervoltage protection;
· Output overcurrent and short circuit protection;
· Battery overcharge, overdischarge, overcurrent protection;
· IC over-temperature protection (threshold 125 ℃, hysteresis 40 ℃);
· NTC temperature protection, support high and low temperature charging prohibition;
· ESD protection up to 4kV, key pin withstand voltage 30V.
7. typical application scenarios
CXLB73327 are ideal for the following applications:
· High-power mobile power supply and energy storage equipment;
· Battery management systems for power tools and drones;
· Industrial hand-held equipment and emergency power supply;
· Type-C interface for smart home and portable devices;
· Charge and discharge control module for multi-section lithium battery pack.
Key Points of 8. Design and BOM Suggestions
· inductance selection: 10μH, 15A saturation current, low DCR power inductor is recommended;
· Capacitance Configuration: It is recommended to use 22μF MLCC in parallel with 100μF solid-state capacitor for input and output, pay attention to DC bias derating;
· sampling resistance: Use 0.005Ω high-precision, low-temperature drift metal film resistor;
· NTC Circuit: A 100nF capacitor should be arranged near the NTC pin, and a 10kΩ resistor should be connected to the ground when NTC is not used;
· EN pin: It must be connected to a 10kΩ pull-down resistor and cannot be suspended.
9. epilogue
With its high integration, multi-protocol compatibility, high power density and comprehensive system protection functions, the CXLB73327 provides a complete solution for modern high-performance battery charge and discharge systems. Whether it is a consumer product seeking extreme efficiency or an industrial device requiring high reliability, the chip can meet the design requirements.
JTM-IC（jtm-ic.com) As a professional integrated circuit solution provider, we are committed to providing customers with high-performance, high-reliability chip products and complete technical support. For CXLB73327 samples, technical information or design assistance, please visit our official website or contact the technical support team.
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