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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > AC DC Converters, Offline Switches

Infineon Technologies CYPAS111A1-24LQXQT

Name: CYPAS111A1-24LQXQT
Brand: Infineon Technologies
SKU: CYPAS111A1-24LQXQT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CYPAS111A1-24LQXQT

Manufacturer:: Infineon Technologies

Category:: AC DC Converters, Offline Switches

Package:: 24-UFQFN Exposed Pad

Datasheet:: CYPAS111A1-24LQXQT.pdf

Description:: IC OFFLINE SWITCH FLYBACK 24QFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,500

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Product details

Overview

CYPAS111A1-24LQXQT from Infineon is an integrated secondary-side synchronous flyback controller, SR controller, and USB PD/PPS charging port controller in a 24-QFN package. It delivers CV/CC regulation (3.3–21.5 V / 1–3 A), supports QR/CrCM/DCM/burst modes, achieves <30 mW no-load power, and is USB-IF certified (TID:1475) for USB PD 3.0 PPS adapters.

For engineers reviewing the CYPAS111A1-24LQXQT datasheet, CYPAS111A1-24LQXQT pinout, CYPAS111A1-24LQXQT application, or CYPAS111A1-24LQXQT equivalent, this device serves as a full-featured secondary-side control solution for high-efficiency AC-DC USB PD 3.0 PPS and QC4+ power adapters requiring integrated SR gate drive, LSCSA, dual VBUS discharge FETs, and robust fault protection.

Technical Context

EZ-PD™ PAG1S implements a multi-mode PWM controller with analog error amplifiers for independent CV and CC regulation, feed-forward line sensing for fast transient response, and valley-switching detection logic for QR/CrCM operation. It integrates a low-side current sense amplifier (LSCSA) with programmable reference (0.4–2.1 V) and supports configurable OVP/UVP/OCP/SCP/OTP thresholds.

The device features a synchronous rectifier gate driver (SR_GDRV) capable of driving external NFETs at VDDD or 2×VDDD using an internal doubler circuit (SR_CPP/SR_CPN), with negative-sense, ZCD, peak-detect, and feed-forward SR_SEN sensing across primary:secondary turns ratios from 4:1 to 10:1.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Regulation Range	CV: 3.3–21.5 V; CC: 1–3 A - directly supports USB PD PPS profile requirements.
Switching Frequency	20–150 kHz - enables optimized magnetics design across QR, CrCM, DCM, and burst modes.
No-Load Power	<30 mW - meets CoC Tier 2 and DoE Level VI efficiency standards in EZ-PD™ PAG1P designs.
Operating Temperature	–40°C to +105°C - qualified for industrial-grade power adapter environments.
USB PD Compliance	USB PD 3.0 with PPS (USB-IF certified, TID:1475) - ensures interoperability with certified host and sink devices.
Fault Protections	OVP/UVP/OCP/SCP/OTP + VBUS-to-CC short protection + ESD on CC/VBUS/DP/DM - enables robust field reliability.
Integrated Functions	LSCSA, 2×VBUS discharge FETs, NFET load switch driver, BMC PHY, SWD debug interface - reduces BOM count by ≥7 discrete components.

Pinout & Package

Package: 24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), exposed thermal pad (EPAD) for enhanced thermal dissipation in compact USB PD adapter designs.

Pin/Terminal	Circuit Role	Design Meaning
SR_GDRV	Synchronous rectifier gate driver output	Drives external SR NFET gate at VDDD or 2×VDDD; enables low R_DS(on) operation via internal doubler.
SR_SEN	SR drain node sense input	Accepts resistive divider from SR FET drain; supports negative-sense, ZCD, peak detect, and feed-forward for precise timing.
FB	CV regulation feedback input	Internal 200 kΩ/35 kΩ divider sets 0.744 V reference; supports 3.3–21.5 V output via IDAC-adjusted voltage division.
CSP / CSN	LSCSA differential inputs	Measure shunt voltage for CC regulation; programmable reference (0.4–2.1 V) enables 1–3 A compliance with PPS.
CC1 / CC2	USB Type-C configuration channel	BMC physical layer interface for USB PD negotiation; includes ESD protection per USB-IF spec.
VBUS_CTRL	Load switch NFET gate driver	Directly drives external NFET to enable/discharge VBUS; supports soft-start and fault-controlled shutdown.

Key Features

Feature	Design Value
Integrated SR + CV/CC + PD Protocol Engine	Single-chip replacement for discrete SR controller, TL431-based feedback, and separate PD MCU - eliminates inter-chip timing skew and layout complexity.
Configurable SR Timing Parameters	Minimum on/off time, operating frequency range, and SR_SEN thresholds are firmware-configurable via EZ-PD™ Configuration Utility - enables optimization across transformer turns ratios and load profiles.
Dual VBUS Discharge FETs	On-chip 120 Ω NMOS FETs discharge VBUS within <1 s after disconnect - satisfies USB PD specification t_discharge requirement without external components.
SWD Debug Interface	DP_GPIO4/DM_GPIO5 double as SWD_CLK/SWD_DATA - enables in-system firmware update and real-time debug without additional test pads or connectors.

Applications

USB PD 3.0 PPS Adapter

QC4+/QC4 Dual-Protocol Adapter

Use Scenario: 65 W laptop charger supporting adaptive 3.3–21 V @ 3 A PPS profiles.

IC Role / Device Role / Timing Role: Secondary-side controller performing real-time CV/CC regulation, SR timing, and BMC communication with source.

Use Value: Enables ±20 mV PPS voltage accuracy and 50 mA current resolution while maintaining >94% peak efficiency at 20 V/3 A output.

Use Scenario: Universal travel adapter compatible with Samsung AFC, Apple 2.4 A, and QC4+ fast charging.

IC Role / Device Role / Timing Role: Multi-protocol charging port controller managing handshake, voltage negotiation, and SR timing across legacy and USB PD standards.

Use Value: Reduces firmware development effort by integrating protocol stacks for QC2.0–QC4+, AFC, BC1.2, and Apple charging into one silicon platform.

Compact 30 W GaN Adapter

Industrial USB-C Power Module

Use Scenario: 30 W GaN-based wall adapter with 20 mm × 20 mm PCB footprint.

IC Role / Device Role / Timing Role: High-frequency synchronous rectifier controller enabling valley switching at 120 kHz with GaN primary FET.

Use Value: Achieves <30 mW no-load power and 93.5% efficiency at 15 V/2 A, meeting EU CoC Tier 2 without auxiliary winding.

Use Scenario: DIN-rail mounted USB-C power supply for industrial HMIs and IoT gateways.

IC Role / Device Role / Timing Role: Industrial-grade secondary controller with –40°C to +105°C operation and reinforced ESD/short-circuit protection.

Use Value: Ensures reliable hot-plug operation and sustained 3 A output under 85°C ambient with no derating, validated per IEC 61000-4-2 Level 4.

Equivalent & Alternatives

The following parts are listed as comparable options for similar secondary-side USB PD controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ4282-AEC1 from Monolithic Power Systems	Automotive-grade AEC-Q100 qualified; lacks integrated BMC PHY and USB PD 3.0 PPS support; requires external PD MCU.	Targeted at automotive USB-C outlets (e.g., infotainment ports); not USB-IF certified for PPS.	Select when AEC-Q100 qualification is mandatory and PPS is not required.
STCH03 from STMicroelectronics	Standalone SR controller only; no CV/CC regulation, no PD protocol engine, no LSCSA - requires external TL431 and PD IC.	Used in cost-sensitive non-PD adapters where only SR efficiency is needed (e.g., 5 V/3 A chargers).	Select only for basic QR/DCM flyback designs without USB PD or PPS functionality.

Compared with MPQ4282-AEC1 and STCH03, CYPAS111A1-24LQXQT uniquely integrates full USB PD 3.0 PPS protocol stack, CV/CC regulation, SR control, and LSCSA in one die - eliminating external PD MCU, shunt resistor, and feedback IC while delivering USB-IF-certified interoperability and <30 mW no-load power.

Availability

CYPAS111A1-24LQXQT is available at Aetrix Electronics and suitable for USB PD 3.0 PPS adapters, QC4+ multi-protocol chargers, and industrial USB-C power modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for CYPAS111A1-24LQXQT 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 German semiconductor manufacturer specializing in power management, automotive MCUs, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

CYPAS111A1-24LQXQT belongs to the EZ-PD™ PAG1S product line, designed specifically for high-efficiency, single-chip secondary-side control in USB PD 3.0 PPS and multi-protocol AC-DC power adapters.

FAQ

What is the function of the SR_CPP and SR_CPN pins?

SR_CPP and SR_CPN connect to an external capacitor that enables the internal charge pump to generate 2×VDDD for the SR_GDRV output. This higher gate drive voltage reduces external SR FET R_DS(on), improving conduction efficiency-especially critical at high output currents and low VBUS voltages. The doubler is firmware-configurable and disabled automatically during light-load burst mode.

Does CYPAS111A1-24LQXQT require an external microcontroller for USB PD communication?

No. The device integrates a fully autonomous USB PD 3.0 BMC PHY and protocol engine compliant with USB-IF TID 1475. It handles all PD message exchange-including Source Capabilities, Request, and PPS APDO negotiation-without external MCU intervention. Firmware updates are performed via SWD using DP_GPIO4/DM_GPIO5.

How is constant current regulation implemented without a shunt resistor on the primary side?

CYPAS111A1-24LQXQT uses its integrated low-side current sense amplifier (LSCSA) with differential inputs CSP/CSN to measure voltage across a secondary-side shunt resistor. The LSCSA output feeds a dedicated CC error amplifier with programmable reference (0.4–2.1 V), enabling precise 1–3 A regulation independent of primary-side sensing inaccuracies or transformer leakage.

Can the device support both USB PD and Qualcomm Quick Charge simultaneously?

Yes. The integrated protocol engine natively supports concurrent negotiation: it first establishes USB PD contract (including PPS), then falls back to QC4+/QC4 handshake if PD fails or is unsupported. It also handles QC3.0/2.0, Samsung AFC, Apple 2.4 A, and BC1.2-all within a single firmware image, with automatic mode selection based on sink capability detection.

CYPAS111A1-24LQXQT Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 24-UFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Isolation:: Isolated

Internal Switch(s):: No

Voltage - Breakdown:: -

Topology:: Flyback

Voltage - Start Up:: -

Voltage - Supply (Vcc/Vdd):: 2.7V ~ 5.5V

Duty Cycle:: -

Frequency - Switching:: 20kHz ~ 150kHz

Power (Watts):: -

Fault Protection:: -

Control Features:: -

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Supplier Device Package:: 24-QFN (4x4)

Mounting Type:: Surface Mount

CYPAS111A1-24LQXQT FAQ

1.How can I place an order for CYPAS111A1-24LQXQT through Aetrix?

Please submit a Request for Quotation (RFQ) for CYPAS111A1-24LQXQT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CYPAS111A1-24LQXQT reliable?

The price and inventory of CYPAS111A1-24LQXQT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CYPAS111A1-24LQXQT is usually 5 days.

3.What payment methods are accepted for CYPAS111A1-24LQXQT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CYPAS111A1-24LQXQT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CYPAS111A1-24LQXQT?

CYPAS111A1-24LQXQT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CYPAS111A1-24LQXQT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CYPAS111A1-24LQXQT?

For technical support, including CYPAS111A1-24LQXQT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CYPAS111A1-24LQXQT requirements.

6.How does Aetrix verify that CYPAS111A1-24LQXQT is sourced from the original manufacturer or authorized distributors?

All CYPAS111A1-24LQXQT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CYPAS111A1-24LQXQT meets industry standards.

7.What is the process for return or replacement of CYPAS111A1-24LQXQT?

All CYPAS111A1-24LQXQT units undergo pre-shipment inspection (PSI). If there is an issue with CYPAS111A1-24LQXQT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CYPAS111A1-24LQXQT part is unused and in its original packaging.

Return procedure for CYPAS111A1-24LQXQT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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