Infineon Technologies CYPD5137-40LQXIT

Overview

CYPD5137-40LQXIT from Infineon Technologies (formerly Cypress) is a single-port USB Type-C and Power Delivery 3.0 port controller featuring a 48-MHz Arm® Cortex®-M0 CPU, 128-KB flash, integrated CC transceiver with Rp/Rd termination, VCONN FETs, and 40-pin QFN package. It delivers full PD protocol stack execution, Fast Role Swap, and hardware-level VBUS OVP/UVP/OCP for notebook and PC host applications.

For engineers reviewing the CYPD5137-40LQXIT datasheet, CYPD5137-40LQXIT pinout, CYPD5137-40LQXIT application, or CYPD5137-40LQXIT equivalent, key selection criteria include USB-PD 3.0 compliance, integrated dead-battery Rd, 21.5-V LDO operation, SBU/CC high-voltage protection, and Thunderbolt/DisplayPort alternate-mode mux support.

Technical Context

The device implements a complete USB-PD 3.0 physical layer with BMC encoding/decoding, 4b/5b framing, and collision-avoidance logic on CC1/CC2. Its integrated analog baseband includes programmable current-source Rp (500 mA/900 mA/1.5 A/3 A), Rd for UFP role, and dead-battery Rd switching at boot.

Dual analog muxes enable dynamic routing: a 2×2 USB 2.0 HS switch selects top/bottom D+/D− paths based on plug orientation, while a 4×2 SBU crossbar supports DisplayPort or Thunderbolt alternate modes with flip-aware signal routing and 24-V short-to-VBUS protection on SBU/CC pins.

Key Specifications

Pinout & Package

Package: 6.0 mm × 6.0 mm, 0.5 mm pitch, 40-pin QFN (LQFP-40 footprint compatible), industrial temperature range (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CYPD5236-40LQXIT, this part offers identical feature set but lower VBUS OVP headroom; versus UPD350A-EVAL, it delivers full hardware integration-eliminating 6+ external components-while retaining field-upgradable firmware via USB-C.

Availability

CYPD5137-40LQXIT is available at Aetrix Electronics and suitable for notebook host ports, USB-C docking stations, monitor hubs, and mobile workstation docks requiring stable component supply and long-term lifecycle support.

Supply support for CYPD5137-40LQXIT 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 systems, automotive ICs, and connectivity solutions with emphasis on energy efficiency and reliability.

This device belongs to the EZ-PD™ CCG5C product line, designed specifically for single-port USB Type-C and Power Delivery 3.0 implementations in space-constrained client computing platforms where integration, low power, and PD protocol compliance are critical.

FAQ

What is the maximum VBUS voltage the CYPD5137-40LQXIT can regulate and monitor?

The device integrates an LDO that operates up to 21.5 V from VBUS input and includes hardware-based overvoltage protection with firmware-programmable thresholds. The absolute maximum rating for VBUS pin is 24 V, but sustained operation beyond 21.5 V is not supported due to LDO regulation limits and thermal constraints in the 40-pin QFN package.

Does the CYPD5137-40LQXIT support USB-C audio adapter accessory mode?

No. This device does not implement the USB-C Audio Adapter Accessory Mode (AAA) specification. Its CC logic is optimized for USB-PD 3.0 communication, DRP role swapping, and legacy charging detection (BC 1.2, Apple), but lacks the dedicated AAA state machine, analog audio path, or headset detection circuitry required for audio accessory mode.

Can the integrated SBU mux be used for protocols other than DisplayPort and Thunderbolt?

Yes-the 4×2 SBU analog mux is functionally agnostic and supports any differential signaling protocol routed through SBU1/SBU2, provided signal bandwidth remains within its 500-MHz small-signal bandwidth limit. However, official firmware and reference designs only validate DP and Thunderbolt; custom use requires full signal integrity validation and protocol-specific firmware adaptation.

Is external crystal required for USB-PD timing accuracy?

No. The device integrates a factory-trimmed oscillator meeting USB-PD 3.0 BMC timing jitter requirements (< ±5% duty cycle deviation). An external crystal is unnecessary for PD communication; however, optional 32.768-kHz crystal input is supported on XIN/XOUT pins for RTC or ultra-low-power wake-up timing if needed in system-level sleep management.