Infineon Technologies CYPD3173P-24LQXQT

Overview

CYPD3173P-24LQXQT from Infineon (formerly Cypress) is a USB Type-C® port controller IC with integrated VBUS NFET gate driver, compliant with USB Power Delivery 3.0 (PD 3.0) and Quick Charge 4.0 (QC 4.0). It implements direct-feedback voltage regulation, integrates 24-V-tolerant regulator, VBUS-to-CC short protection, and 64 KB flash for field-upgradable firmware - deployed in programmable AC-DC power adapters with permanently attached cables.

For engineers reviewing the CYPD3173P-24LQXQT datasheet, CYPD3173P-24LQXQT pinout, CYPD3173P-24LQXQT application, or CYPD3173P-24LQXQT equivalent, key selection criteria include PD 3.0 + PPS support, integrated NFET gate drive capability, direct-feedback loop architecture, CC/CV control independence, and pre-certified USB-PD stack on Arm® Cortex®-M0.

Technical Context

The device embeds an Arm Cortex-M0 core running a USB-IF certified PD 3.0 stack with Programmable Power Supply (PPS) support, enabling precise 20 mV/step voltage control between 3.3 V and 21 V. Its direct-feedback regulation loop eliminates optocoupler dependency by using internal error amplifiers and configurable OVP/OCP/OTP thresholds.

It integrates termination resistors (RP/RD), 24-V-tolerant LDO, high-voltage NFET gate driver (capable of driving external 30-V-rated load switches), and dedicated current-sensing input for adaptive overcurrent protection - all in a single 24-pin QFN package.

Key Specifications

Pinout & Package

Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CYPD3172P-24LQXQ, this part enables optocoupler-free designs and PPS; versus STUSB4500, it delivers higher integration (gate driver + regulator + flash) and broader charging protocol coverage, reducing total BOM count by ≥4 components.

Availability

CYPD3173P-24LQXQT is available at Aetrix Electronics and suitable for USB-C power adapters, wall chargers, and embedded power modules requiring stable component supply, field firmware upgradability, and PD 3.0 + PPS compliance.

Supply support for CYPD3173P-24LQXQT 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 acquired Cypress Semiconductor in 2020 and now develops and supports its USB-C and power delivery portfolio.

This device belongs to the EZ-PD™ CCG3PA-NFET product line, designed specifically for highly integrated, programmable USB-C power adapters with direct-feedback regulation and minimal external components.

FAQ

Does CYPD3173P-24LQXQT require external firmware programming before use?

No. The "P" suffix indicates it ships pre-programmed with a functional USB-PD 3.0 stack and default configuration for direct-feedback power adapters. Customers may optionally reprogram it using Cypress's free EZ-PD Configuration Utility and USB-C interface - no JTAG debugger required.

What is the maximum VBUS voltage the integrated gate driver can support?

The VBUS_GD pin drives external NFETs rated up to 30 V, and the internal 24-V-tolerant regulator allows operation with input voltages up to 24 V. This matches typical secondary-side VBUS ranges in 65 W–100 W USB-C adapters with 20 V nominal output.

Can CYPD3173P-24LQXQT operate as both source and sink?

No. It is configured exclusively as a USB-C source (DFP) in factory firmware. Its hardware supports dual-role operation, but the pre-programmed image and reference design target AC-DC adapter applications only - sink mode requires custom firmware development and additional circuitry.

Is the FB pin compatible with third-party primary-side controllers?

Yes. The FB pin accepts standard 0.6–1.25 V feedback signals and interfaces directly with common PWM controllers (e.g., UCC28780, MP6908). Its internal error amplifier and compensation network are optimized for direct connection to primary-side controller feedback inputs without external op-amps.