CYPD4125-40LQXIT

CYPD4125-40LQXIT is a Cypress (now Infineon) USB Type-C Port Controller with Power Delivery (PD) functionality. It’s used to implement USB‑C port negotiation and protection in devices and adapters, handling CC pin logic, PD message processing, role detection, and safe power-path control with external FETs.
Key points:
- PD capability: negotiates voltage/current profiles for USB-C PD
- Port control: CC logic, role swap, VBUS monitoring, protection (overcurrent, overvoltage, thermal)
- MCU interface: typically communicates with a host MCU via I2C/SPI for configuration and status
- Packaging: LQX denotes a small QFN-style package suitable for compact designs (industrial temp range)
- Applications: USB-C power adapters, power banks, docking stations, and other PD-based ports
For exact electrical specs, supported PD revisions, required external components (FETs, passives), and development tools, consult the official datasheet and application notes.

CYPD4125-40LQXIT is a Cypress USB Type‑C Port Controller with Power Delivery. Key features:
- USB Type‑C Port Controller with PD negotiation (PD 2.0/3.0 capable)
- Dual‑role port: CC1/CC2 management, cable orientation detect, VCONN support, and role swapping
- PD voltage range up to 20V with programmable current advertisement
- VBUS switch control interface for external MOSFETs, including overcurrent/short‑circuit and overvoltage protection
- Dead‑battery support
- I2C control interface for configuration and status reporting; fault/alert signals
- ESD protection on USB‑C pins
- Small 40‑pin LQFP package (40LQXIT), RoHS compliant, suitable for compact designs
- Typical low quiescent current and wide operating temperature range
Note: For exact pinout, voltages, and current specs, refer to the latest Cypress datasheet for CYPD4125-40LQXIT.

- Pin count: 40 pins (40‑pin LQX package)
- Function: USB Type‑C port controller with Power Delivery (PD) negotiation/CC logic for a dual‑role USB‑C port (PD protocol engine and related control).

- Manufacturer: Cypress Semiconductor Corporation (now part of Infineon Technologies AG).
- What kind of company: Infineon is a German multinational semiconductor company that designs and manufactures integrated circuits and system solutions (MCUs, memory, sensors, power devices, USB/PD controllers, etc.).

CYPD4125-40LQXIT is a USB Type-C Power Delivery controller. Typical applications include:
- PD negotiation in USB-C chargers, adapters, and power banks
- PD-enabled docking stations, hubs, and displays
- Power-path management for consumer electronics (laptops, tablets, smartphones, wearables)
- Protection and control in USB-C power designs (overcurrent, overvoltage, undervoltage, thermal protection)
- USB-C port with role-switching and safe power delivery in integrated systems
Note: suitable for any design requiring Type-C PD control and related protection features.

40-pin leadless LQFN package (leadless Quad Flat No-Lead).