CYPD3125-40LQXIT

CYPD3125-40LQXIT is a Cypress (now Infineon) USB-C Power Delivery controller IC from the EZ-PD family. It’s used to implement USB-C PD negotiation and power-path management in devices, chargers, or adapters.
Key points:
- Purpose: USB-C PD controller with CC logic and power-delivery negotiation
- Interface: typically programmable via a host MCU over I2C/SPI
- Protection/features: overvoltage, overcurrent, thermal/OTP protections; drives external VBUS FETs for power switching
- Packaging/code: LQXIT indicates a specific lead-free package form factor
- Use case: include in a USB-C port design to establish PD contracts (voltage/current profiles) and safely control VBUS
How to use:
- Refer to the official datasheet and application notes
- Pair with a microcontroller, implement PD firmware, and connect to appropriate VBUS FETs and CC pins
- Validate through the USB PD specification and your design’s requirements
Note: product lines and naming are subject to Infineon/Cypress updates; consult the latest datasheet for exact features and pinout.

CYPD3125-40LQXIT is a Cypress USB Type-C Port Controller with Power Delivery. Key features include:
- USB Type-C Port Controller with USB PD 2.0/3.0 support
- Dual-role Port (DRP) for source/sink negotiation
- I2C control interface for configuration and status
- CC1/CC2 logic for Type-C detection and orientation
- PD contract negotiation with programmable PDOs
- VCONN control and VBUS monitoring
- Protection: overvoltage, undervoltage, overcurrent, short-circuit, fault protection
- VBUS discharge control and dead-battery support
- Low-power/standby operation and configurable wake behavior
- External FETs/power-path driven as needed (PD power path integration varies by design)
- 40-pin LQXIT package (compact, industrial temperature range)
Note: Exact current/voltage specs can vary by revision; verify current capabilities and required external components for your design.

40-pin QFN (leadless) package. The LQX suffix in CYPD3125-40LQXIT indicates a 40‑lead QFN package.

- Pin count: 40 pins (40-LQFP package)
- Function: Cypress CYPD3125 is a USB-C Port/Power Delivery controller that handles CC logic and PD negotiation for a USB Type-C port (uses external FETs for the power path).

The manufacturer is Cypress Semiconductor Corporation, a semiconductor company that designs and manufactures integrated circuits. Cypress is now a subsidiary of Infineon Technologies.

Application areas:
- USB Type-C Power Delivery controller for PD negotiation and CC logic (VBUS control, VCONN, role swap)
- PD-compliant chargers/adapters (wall and portable chargers)
- Power banks, USB‑C hubs and docking stations
- Notebooks and other PD‑enabled devices requiring programmable power negotiation
- Embedded/automotive PD power modules