Infineon Technologies CYPD3177-24LQXQ

Overview

CYPD3177-24LQXQ from Infineon Technologies (formerly Cypress) is a pre-programmed USB Type-C port controller IC for power sinks, integrating USB PD 3.0 Revision 2.0 compliance, VBUS-to-CC short protection, on-chip OVP, soft-start load switch control, and system-level ±8-kV contact / ±15-kV air-gap ESD protection. It operates from 3.0 V to 24.5 V input, supports –40°C to +105°C, and targets barrel-connector legacy devices like drones and power tools requiring USB-C power conversion without firmware development.

For engineers reviewing the CYPD3177-24LQXQ datasheet, CYPD3177-24LQXQ pinout, CYPD3177-24LQXQ application, or CYPD3177-24LQXQ equivalent, key selection criteria include its dead-battery RD termination, SAFE_PWR_EN fallback to 5 V/900 mA, VBUS_FET_EN gate driver slew control, integrated 3.3-V and 1.8-V regulators, and I²C slave interface at address 0x08 with Fast-mode Plus support.

Technical Context

The device implements a full USB PD 3.0 physical layer with BMC-encoded half-duplex CC communication, collision avoidance, and bonded dead-battery RD resistors on both CC1 and CC2 for unpowered plug detection and orientation sensing. Its USB-PD subsystem includes hardware-based VBUS overvoltage protection with configurable thresholds and response times, plus dedicated VBUS-to-CC short protection capable of sustaining 17 V indefinitely and 17–22 VDC for 1000 hours.

Power management integrates a high-voltage regulator generating VDDD (3.3 V) from VBUS_IN, a secondary 1.8-V regulator for core logic (VCCD), and two independent gate drivers: VBUS_FET_EN for negotiated power path control and SAFE_PWR_EN for 5-V fallback operation. The I²C host processor interface (HPI) operates up to 1 Mbps but exhibits non-compliant IOL (8 mA max at VOL ≤ 0.6 V) and relaxed fall-time behavior under heavy bus loads.

Key Specifications

Pinout & Package

Supplied in a 24-pin QFN package (4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad). Pin functions are validated per Cypress Infineon Document 002-25383 Rev. *B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STUSB4500QTR and TUSB8041RJBR, CYPD3177-24LQXQ uniquely combines dead-battery RD, dual gate drivers, and integrated VBUS discharge in a 24-pin footprint - making it optimal for space-constrained, firmware-free sink upgrades requiring guaranteed 5-V fallback and field-proven short-circuit resilience.

Availability

CYPD3177-24LQXQ is available at Aetrix Electronics and suitable for drone battery charging systems, smart speaker power interfaces, and industrial power tool chargers requiring stable component supply, extended temperature operation, and USB-C PD compliance without firmware overhead.

Supply support for CYPD3177-24LQXQ 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 acquired Cypress Semiconductor in 2020 and maintains its USB-C and power delivery portfolio under the EZ-PD™ brand, delivering high-reliability mixed-signal ICs for industrial, automotive, and consumer markets.

CYPD3177-24LQXQ belongs to the EZ-PD™ BCR (Barrel Connector Replacement) product line, specifically engineered to simplify migration from legacy DC barrel connectors to USB-C power delivery in rechargeable portable electronics - eliminating firmware development and minimizing external components.

FAQ

What is the function of the FLIP pin, and how does its pull-up resistor value affect system behavior?

The FLIP pin indicates USB-C plug orientation: pulled low for CC1 connection (unflipped), high for CC2 (flipped). Its external pull-up resistor determines UFP Vendor Data Object (VDO) data capability reporting: ≤4.7 kΩ sets data-capable bit to 1; 50 kΩ sets it to 0. This directly controls whether the downstream-facing port (DFP) enables USB 2.0 data negotiation during PD contract establishment.

Does CYPD3177-24LQXQ require an external crystal or oscillator?

No external clock source is required. The device integrates a factory-trimmed oscillator that meets USB PD timing requirements for BMC encoding/decoding on the CC channel. This eliminates board space, cost, and layout sensitivity associated with external crystals or oscillators - critical for compact portable designs.

How does the VBUS_FET_EN pin behave during USB PD negotiation failures?

VBUS_FET_EN remains de-asserted (low) if the PD negotiation fails to meet the programmed VBUS_MIN/VBUS_MAX and ISNK_COARSE/ISNK_FINE limits. Only upon successful contract acceptance does it drive high with controlled slew rate to enable the external PFET. This prevents unregulated VBUS from reaching the system load during invalid or unsafe power conditions.

Can the I²C interface be used to dynamically adjust negotiated voltage or current limits?

No - voltage and current limits are statically configured at boot via resistor dividers on VBUS_MIN/VBUS_MAX and ISNK_COARSE/ISNK_FINE pins. The I²C (HPI) interface provides read-only status access (e.g., FAULT, FLIP, negotiated PDO) and does not support runtime reconfiguration of PD contract parameters.