Infineon Technologies CYPD3172-24LQXQ

Overview

CYPD3172-24LQXQ from Infineon Technologies (formerly Cypress) is a USB Type-C port controller with integrated NFET gate driver, designed for secondary-side feedback control in AC/DC power adapters. It supports USB PD 3.0 PPS, QC4+, and legacy charging protocols, delivers independent constant voltage (3.3–21 V) and constant current (1–3 A) regulation, and integrates BMC transceiver, LSCSA, dual error amplifiers, and opto-coupler/direct feedback interfaces.

For engineers reviewing the CYPD3172-24LQXQ datasheet, CYPD3172-24LQXQ pinout, CYPD3172-24LQXQ application, or CYPD3172-24LQXQ equivalent, key selection criteria include its dual-mode CV/CC regulation accuracy, integrated 24-pin QFN package with –40 °C to +105 °C operation, VBUS_IN range (3.3–21.5 V), NFET gate drive capability (VBUS_IN + 8 V clamp), and support for opto-coupled or direct secondary-side feedback architectures.

Technical Context

The device implements two independent analog error amplifiers-one for constant voltage (CV) regulation referenced to 0.744 V and one for constant current (CC) using low-side current sense amplifier (LSCSA) inputs CSP/CSN-with programmable IDACs enabling precise output adjustment. Its BMC PHY handles half-duplex USB PD communication over CC1/CC2 with built-in Rp termination switching and collision avoidance.

Power management includes a high-voltage regulator (3.3–21.5 V input → 5 V or VBUS_IN − 300 mV output), dual LDOs (VDDD: 3.0–5.5 V; VCCD: 1.8 V), and configurable protection logic for OVP/UVP/OCP/SCP/OTP. The NFET gate driver on VBUS_CTRL provides active high-side switching control with internal clamping and discharge paths for VBUS_IN and VBUS_C rails.

Key Specifications

Pinout & Package

CCG3PA-NFET is housed in a thermally enhanced 24-pin QFN package (4 mm × 4 mm, 0.5 mm pitch) with EPAD for ground connection and optimized thermal performance in compact power adapter designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CYPD3171-24LQXQ and IP2721, CYPD3172-24LQXQ uniquely integrates dual-loop CV/CC regulation, firmware-upgradable protocol stack, and six GPIOs-making it the only option among the three capable of field-updatable PPS behavior and multi-protocol coexistence without external controllers.

Availability

CYPD3172-24LQXQ is available at Aetrix Electronics and suitable for USB PD 3.0 PPS power adapters, Quick Charge 4.0 wall chargers, and universal GaN-based fast chargers requiring stable component supply, long-term lifecycle support, and full production traceability.

Supply support for CYPD3172-24LQXQ 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 specializing in power management, automotive, and industrial control solutions, with headquarters in Munich, Germany.

CYPD3172-24LQXQ belongs to the EZ-PD™ CCG3PA family, engineered specifically for intelligent, software-defined USB-C power delivery in compact AC/DC adapters-emphasizing integration, thermal efficiency, and firmware adaptability.

FAQ

What is the maximum VBUS_IN voltage the CYPD3172-24LQXQ can tolerate?

The device supports VBUS_IN up to 21.5 V absolute maximum, with its internal HV regulator operating across 3.3 V to 21.5 V. At 21.5 V input, the regulator delivers 5 V to VDDD with typical 50 mA load capacity. Exceeding 21.5 V risks permanent damage to the regulator and core circuitry, as confirmed in Absolute Maximum Ratings (Section 11.1 of datasheet 002-30172 Rev. *A).

Does CYPD3172-24LQXQ require external pull-up resistors on CC1/CC2 lines?

No. The device integrates programmable Rp termination resistors (default 5.1 kΩ) and automatic switching logic for UFP/DFP roles, eliminating external CC pull-ups. External 390 pF capacitors are mandatory on CC1 and CC2 for EMC compliance and signal integrity, as specified in Pin Description (Page 5) and Application Diagram (Page 6).

Can the CYPD3172-24LQXQ operate without an opto-coupler?

Yes. It supports direct feedback via resistor divider on FB pin, using internal IDACs to source/sink current and adjust output voltage. This mode avoids isolation components but requires the primary controller to accept analog feedback-common in integrated SR controllers or digitally controlled flybacks with ADC-based feedback loops.

How many firmware updates can be performed over the CC interface?

Firmware updates over CC are unrestricted in count and supported throughout product lifetime. The device implements secure boot and dual-bank flash architecture (64 KB total), allowing field updates without downtime. Each update validates signature and CRC before committing, ensuring robustness against corruption during power loss or cable disconnect.