With the increasing popularity of Internet of Things devices, smart homes, power tools and various portable electronic devices, efficient, safe and compatible power management solutions have become the core of product design. As a highly integrated USB power delivery (PD) controller, CXLB73325 supports up to 100W power output in the receiver role, is compatible with PD3.1 and Type-C V2.1 standards, and covers a variety of traditional fast charging protocols, making it an ideal choice for power supply design of modern electronic equipment. This article will comprehensively analyze the functional characteristics, pin configuration, typical applications and technical details of the CXLB73325 to help engineers select and design efficiently.
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[ CXLB73325 ]"
With the increasing popularity of Internet of Things devices, smart homes, power tools and various portable electronic devices, efficient, safe and compatible power management solutions have become the core of product design. As a highly integrated USB power delivery (PD) controller, CXLB73325 supports up to 100W power output in the receiver role, is compatible with PD3.1 and Type-C V2.1 standards, and covers a variety of traditional fast charging protocols, making it an ideal choice for power supply design of modern electronic equipment. This article will comprehensively analyze the functional characteristics, pin configuration, typical applications and technical details of the CXLB73325 to help engineers select and design efficiently.
1. chip overview and core technology characteristics
CXLB73325 is a stand-alone USB PD receiver controller with broad protocol compatibility and high integration for a wide range of power input scenarios from traditional Micro-B interfaces to modern Type-C interfaces. Its core features include:
· Support USB PD receiver mode, maximum voltage 20V, current 5A, total power up to 100W;
· Compatible with PD3.1, Type-C V2.1, and support BC1.2, QC2.0(12V), SDP, CDP, DCP and other traditional charging protocols;
· With "power out start" function, even if the battery is fully discharged can still wake up the system;
· VBUS, CC1, CC2 pins with 25V high withstand voltage, improve system reliability;
· Support external resistor to set target RDO voltage, flexible configuration;
· Built-in eMarker simulation function, suitable for high current (>3A)Type-C cables;
· Static power consumption as low as 1.3mA @ 5V, energy saving and high efficiency;
· ± 2kV HBM ESD protection for enhanced interface robustness.
2. pin function and electrical parameters
CXLB73325 provide two package forms: DFN2 * 2-6L and SOT23-5, to adapt to different space and heat dissipation requirements. The following is a description of its main pin functions:
2.1. DFN-6L Package Pins:
· CC1/CC2: Type-C configuration channel for protocol negotiation;
· VBUS: Power input, connected to Type-C VBUS, requires an external 1μF decoupling capacitor;
· VSET: voltage setting pin, external resistor to set the application voltage;
· D /D-: Data line supporting BC1.2 protocol;
· GND: System grounding.
2.2. SOT23-5 Package Pins:
· The pins are more streamlined, covering VSET, GND, VBUS, CC1 and CC2, and are suitable for designs with extremely limited space.
· The operating voltage range of the chip is 3V to 22V, and the junction temperature range is -40°C to 125°C, which is suitable for harsh industrial and consumer environments.
3. voltage setting and VSET configuration
The CXLB73325 can flexibly set the voltage required by the system through the external resistor or capacitor of the VSET pin. The specific configuration is as follows:
| VSET Configuration (Resistor/Capacitor) | Application voltage |
|---|---|
| 0 Ω (short circuit) | 5V |
| 75kΩ | 9V |
| Open circuit | 12V |
| 4.7nF | 15V |
| 20nF | 20V |
The design enables the same chip to be adapted to a variety of power systems, greatly simplifying the complexity of product serialization development.
4. typical application scenarios
CXLB73325 are widely used in the following areas:
· PD receiving device: such as laptops, tablets, monitors, etc;
· Type-C cable: Support eMarker simulation, suitable for high current transmission;
· Wireless charger: as an input-level protocol controller;
· Power tools and drones: High power, high compatibility power input scheme;
· Smart speakers and IoT devices: Replace the traditional barrel or Micro-B interface, unified Type-C power input.
5. system structure and working principle
CXLB73325 internal integrated voltage regulator, PD physical layer and protocol layer, port controller and BC1.2 detection module. Its workflow is as follows:
5.1. After the equipment is connected to the Type-C power supply, the chip applies Rd resistance on the CC line to establish the connection;
5.2 detect CC and D /D-signals, identify charger type and protocol;
5.3. According to the VSET setting, apply for the target voltage through the PD protocol;
5.4. If the traditional protocol (such as QC2.0, BC1.2) is detected, it will automatically switch to the corresponding mode;
5.5. Throughout the process, the chip continuously monitors the input voltage and temperature to ensure safe operation of the system.
6. Packaging and Thermal Design Recommendations
CXLB73325 offers two packaging options:
· DFN-6L: Thermal resistance & theta;JA is 103.8°C/W, suitable for high power density design;
· SOT23-5: Thermal resistance & theta;JA is 220°C/W, suitable for low and medium power scenarios.
It is suggested that copper should be fully laid and heat dissipation vias should be set in PCB design to optimize the heat dissipation performance of the chip and improve the reliability of the system.
7. epilogue
With its high integration, wide protocol compatibility, flexible voltage configuration and excellent anti-interference ability, CXLB73325 become the ideal PD receiver solution in modern electronic equipment. Whether it is consumer electronics, industrial equipment or power tools, the chip can provide stable, efficient and safe power input management.
JTM-IC（jtm-ic.com) As a professional integrated circuit solution provider, we are committed to providing customers with high-performance and high-reliability chip products and technical support. For CXLB73325 samples, technical materials or design support, please visit our official website or contact the technical support team.
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