Infineon Technologies CYPD3172-24LQXQT

Overview

CYPD3172-24LQXQT from Infineon Technologies (formerly Cypress) is a USB Type-C port controller with integrated NFET gate driver, designed for secondary-side feedback control in USB PD 3.0 PPS and QC4+ power adapters. It supports constant voltage (3.3–21 V) and constant current (1–3 A) regulation, integrates BMC transceiver, LSCSA, dual error amplifiers, and operates across –40 °C to +105 °C.

For engineers reviewing the CYPD3172-24LQXQT datasheet, CYPD3172-24LQXQT pinout, CYPD3172-24LQXQT application, or CYPD3172-24LQXQT equivalent, key selection criteria include opto-coupled vs. direct feedback architecture support, CC/CV regulation range, integrated protection thresholds (OVP/UVP/OCP/SCP/OTP), and 24-QFN thermal performance in compact AC-DC adapter designs.

Technical Context

The device implements two independent error amplifiers-one for CV mode (FB/EА_OUT/CC_COMP_GPIO2) with 0.744 V internal reference and configurable IDACs, and one for CC mode using LSCSA (CSP/CSN) with 5–150× gain and 5 mΩ sense resistor support. It regulates VBUS via analog feedback to primary controllers through EA_OUT current sourcing/sinking.

Its USB-PD PHY includes full BMC transceiver with built-in Rp termination switching, collision avoidance, and half-duplex CC1/CC2 communication compliant with USB PD 2.0/3.0 and PPS. The NFET gate driver on VBUS_CTRL delivers VBUS_IN + 8 V gate drive with clamping and supports load switch control in high-efficiency flyback topologies.

Key Specifications

Pinout & Package

Supplied in a thermally enhanced 24-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with exposed pad (EPAD) connected to VSS for PCB-level heat sinking in compact power adapter layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STUSB4500QTR and MPQ4282GQ-AEC1, CYPD3172-24LQXQT uniquely integrates PPS-compliant CV/CC dual-loop regulation, hardware protection, and NFET gate drive in a single 24-QFN package-reducing adapter design cycle time by eliminating three external ICs and associated layout complexity.

Availability

CYPD3172-24LQXQT is available at Aetrix Electronics and suitable for USB PD 3.0 PPS adapters, Quick Charge 4.0 wall chargers, and universal travel adapters requiring stable component supply, extended temperature operation, and long-term lifecycle support.

Supply support for CYPD3172-24LQXQT 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 is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensor, and connectivity solutions for industrial, automotive, and consumer markets.

CYPD3172-24LQXQT belongs to Infineon's EZ-PD™ CCG3PA product line, engineered specifically for high-density, multi-protocol USB-C power adapters requiring integrated feedback control, safety-critical protection, and minimal external components.

FAQ

What feedback architectures does CYPD3172-24LQXQT support?

CYPD3172-24LQXQT supports both opto-coupler-based isolated feedback (via EA_OUT current drive into opto-LED) and direct feedback (via FB node voltage adjustment using internal IDACs). The dual error amplifier architecture allows independent tuning of CV and CC loops in either configuration, enabling compliance with USB PD 3.0 PPS requirements across flyback, LLC, and active clamp topologies.

How is overcurrent protection implemented without external sense resistors?

Overcurrent protection uses the integrated low-side current sense amplifier (LSCSA) with CSP/CSN inputs and programmable gain (5–150×). With a typical 5 mΩ shunt resistor, it achieves ±1% accuracy across –40 °C to +105 °C. Thresholds are configured via I²C or hardware pins, and fault response is hardware-asserted within 1 µs-bypassing firmware latency for safety-critical shutdown.

Can CYPD3172-24LQXQT operate as both source and sink?

No-CYPD3172-24LQXQT is source-only. Its VBUS_CTRL pin drives an external high-side NFET to enable VBUS output, and its BMC transceiver is configured for source-side PD contract initiation. It lacks Rd termination and sink-side feedback handling required for dual-role operation. For DRP applications, Infineon recommends CCG6 or CCG7 series devices.

What is the function of the XRES pin and its reset behavior?

XRES is an active-low external reset input, internally pulled high. Driving it low for ≥100 ns initiates a full hardware reset: all registers clear, GPIOs enter tri-state (except GPIO1, forced low), and the MCU subsystem restarts from boot ROM. This pin enables system-level recovery from latch-up or brown-out conditions independent of VBUS_IN stability.