Infineon Technologies CYPD3120-40LQXIT

Overview

CYPD3120-40LQXIT from Infineon Technologies (formerly Cypress) is a USB Type-C and Power Delivery 3.0 port controller IC with integrated ARM® Cortex®-M0 processor (48 MHz), 128-KB flash, 8-KB SRAM, dual VCONN FETs, two pairs of VBUS gate drivers, hardware crypto engine, full-speed USB device controller, and system-level ±8-kV contact ESD protection. It serves as the central PD protocol manager and power path controller in single-port USB-C applications including power adapters, docking stations, and monitors.

For engineers reviewing the CYPD3120-40LQXIT datasheet, CYPD3120-40LQXIT pinout, CYPD3120-40LQXIT application, or CYPD3120-40LQXIT equivalent, key selection considerations include its 40-QFN package, 20-V-tolerant VBUS regulation, BMC transceiver with Fast Role Swap support, integrated OVP/OCP, and configurable I²C/SPI/UART serial blocks for host communication and firmware updates.

Technical Context

The CYPD3120-40LQXIT implements a complete USB-PD 3.0 subsystem with dedicated BMC PHY, analog crossbar for DisplayPort AUX/SBU routing, HPD processor, and programmable RA/RP/RD terminations. Its dual VBUS gate drivers support both N- and P-channel external FETs with independent control logic and automatic fault shutdown via CSA- and OV-triggered interrupts.

It integrates a 32-bit Cortex-M0 CPU with SWD debug interface, hardware AES/SHA/CRC crypto block for secure firmware authentication, and four reconfigurable Serial Communication Blocks (SCBs) - each supporting I²C (up to 1 Mbps), SPI, or UART - enabling flexible host-side configuration and real-time PD policy engine execution.

Key Specifications

Pinout & Package

Package: 40-pin QFN (6 mm × 6 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad. Industrial temperature range: –40 °C to +105 °C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB-C port controller applications.

Compared with STUSB4500QTR and TUSB8041A, CYPD3120-40LQXIT provides full programmability, integrated power FET control, and cryptographic security - making it suitable for adaptive, upgradable, and safety-certifiable USB-C endpoints where firmware-defined behavior and autonomous fault response are required.

Availability

CYPD3120-40LQXIT is available at Aetrix Electronics and suitable for USB-C power adapters, docking stations, and monitor designs requiring stable component supply, long-term lifecycle support, and industrial-grade temperature operation.

Supply support for CYPD3120-40LQXIT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive MCUs, and connectivity solutions with emphasis on reliability and industrial-grade performance.

CYPD3120-40LQXIT belongs to the EZ-PD™ CCG3 product line, designed specifically for single-port USB Type-C and Power Delivery 3.0 implementations in space-constrained, safety-critical power delivery and peripheral connectivity systems.

FAQ

Does CYPD3120-40LQXIT support USB Power Delivery 3.0 Programmable Power Supply (PPS)?

Yes. The CYPD3120-40LQXIT firmware supports PPS through its integrated BMC transceiver and real-time Cortex-M0 processing. It implements the full PD 3.0 specification including PPS voltage step control (20 mV), current step control (50 mA), and fast feedback loop timing (≤10 ms response). PPS operation requires compatible firmware version 3.4.0 or later and proper configuration of the VBUS regulation loop using external FETs and sensing resistors.

Can CYPD3120-40LQXIT operate without an external crystal?

Yes. The device integrates a factory-trimmed IMO (Internal Main Oscillator) capable of 48 MHz operation with ±2% accuracy across temperature and voltage - sufficient for USB-PD BMC timing and full-speed USB device operation. An external crystal is optional and only required if tighter frequency stability (< ±0.25%) is needed for specific USB audio or isochronous applications.

What is the maximum continuous current rating for the integrated VCONN FETs?

The integrated VCONN FETs are rated for continuous 100 mA output per channel (CC1 or CC2) with thermal derating above 70 °C ambient. They are designed to power standard e-marked cables compliant with USB-C Specification Revision 2.1. For higher-current accessories, external VCONN regulators must be used - the CYPD3120-40LQXIT provides control signals but does not drive >100 mA continuously.

Is SWD debugging supported in production firmware builds?

Yes. Serial Wire Debug (SWD) remains accessible via dedicated SWDIO and SWCLK pins regardless of firmware build configuration. However, debug access can be permanently disabled by setting the "Debug Lock" bit in the flash protection register during final programming - this prevents readback and breakpoint injection while preserving SWD-based firmware updates over the same interface.