Infineon Technologies CYPD3178-24LQXQ

Overview

CYPD3178-24LQXQ from Infineon is a pre-programmed USB Type-C sink port controller for barrel connector replacement in power-sink devices. It supports 5 V @ 3 A USB-C power delivery, legacy charging protocols (BC1.2, Apple, AFC, QC 2.0), and integrated VBUS load switch control with soft-start. Used in drones, smart speakers, and power tools requiring seamless transition from micro-B/barrel to USB-C power input.

For engineers reviewing the CYPD3178-24LQXQ datasheet, CYPD3178-24LQXQ pinout, CYPD3178-24LQXQ application, or CYPD3178-24LQXQ equivalent, key selection criteria include VBUS_MIN/MAX resistor-divider configuration, CC short protection rating (17–22 V tolerance), SAFE_PWR_EN fallback behavior, and I²C slave address (0x08) for host processor interface integration.

Technical Context

The device implements a dedicated USB Type-C physical layer with bonded dead-battery RD resistors on both CC pins for UFP role detection and plug orientation sensing-enabling sink operation without external biasing. Its hardware-based VBUS OVP/UVP and VBUS-to-CC short protection operate independently of firmware, clamping transient ringing up to 44 V and sustaining 17 V indefinitely on CC pins.

The integrated load switch controller drives external PFETs via slew-rate-controlled VBUS_CTRL and SAFE_PWR_EN gate drivers; the latter activates only when CHARGING_MODE enables legacy protocols and higher-power contracts fail, delivering 5 V to alternate rails. Power supply flexibility includes dual-input operation (VBUS_IN_DIS: 3.0–24.5 V or VDDD: 2.7–5.5 V) with internal 3.3 V LDO and 1.8 V core regulator.

Key Specifications

Pinout & Package

Supplied in a 24-pin QFN package (4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad), optimized for compact USB-C port integration with minimal external components.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CYPD3177-24LQXQ, this part adds essential D+/D− legacy support and SAFE_PWR_EN for robust fallback; versus STUSB4500QTR, it trades programmability for turnkey integration-reducing design time and external component count by >40% in legacy-compatible portable devices.

Availability

CYPD3178-24LQXQ is available at Aetrix Electronics and suitable for drone battery charging, smart speaker power input, and industrial handheld scanner designs requiring stable component supply, extended temperature operation (–40°C to +105°C), and USB-C port consolidation.

Supply support for CYPD3178-24LQXQ 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 German semiconductor manufacturer specializing in power management, automotive ICs, and USB-C solutions, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

This device belongs to the EZ-PD™ BCR (Barrel Connector Replacement) product line, designed specifically to accelerate migration from legacy DC jacks to USB-C power input in portable and rechargeable consumer and industrial electronics.

FAQ

What is the purpose of the VBUS_MIN and VBUS_MAX pins?

VBUS_MIN and VBUS_MAX accept resistor dividers referenced to VDDD (3.3 V) to define the acceptable voltage window for negotiated power contracts. For example, setting VBUS_MIN = 5 V ensures compatibility with standard USB-A adapters, while VBUS_MAX = 20 V allows up to 100 W PD contracts. These pins directly configure hardware comparators - no I²C register writes needed.

Does CYPD3178-24LQXQ require firmware development?

No. It is pre-programmed for sink operation with fixed logic for USB-C detection, PD negotiation, legacy charging, and fault response. Host interaction is limited to optional I²C monitoring (e.g., reading FAULT status or VBUS level). No bootloader, firmware update, or USB stack integration is required - enabling true "zero-code" USB-C adoption.

How does SAFE_PWR_EN behave during power negotiation failure?

SAFE_PWR_EN activates only when CHARGING_MODE is asserted high *and* the requested PD contract cannot be met - e.g., source offers only 5 V while VBUS_MIN is set to 9 V. It then drives an external PFET to deliver 5 V to a secondary rail, allowing partial system operation. It remains inactive if CHARGING_MODE is low or if 5 V is within the negotiated range.

Is external ESD protection required on CC or D+/D− lines?

No. The device integrates full IEC61000-4-2 Level 4C ESD protection (±8 kV contact / ±15 kV air) on CC1, CC2, D+, D−, HPI_SDA, HPI_SCL, VBUS_IN_DIS, and DC_OUT_DIS pins. External TVS diodes are unnecessary unless system-level requirements exceed these ratings - verified by Infineon's qualification testing per AEC-Q100 stress conditions.