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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Gate Drivers

Infineon Technologies IR11671ASTRPBF

Name: IR11671ASTRPBF
Brand: Infineon Technologies
SKU: IR11671ASTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR11671ASTRPBF

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: IR11671ASTRPBF.pdf

Description:: IC GATE DRVR FET EXTERNAL 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:4,380

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Product details

Overview

IR11671ASTRPBF from Infineon Technologies is a high-voltage, self-oscillating synchronous rectification controller for flyback converters, featuring 120 V maximum V_CC, 1.5 A peak gate drive current, and operation up to 500 kHz. It replaces diode rectifiers in AC/DC adapters and USB PD chargers to improve efficiency above 90% at full load.

For engineers reviewing the IR11671ASTRPBF datasheet, IR11671ASTRPBF pinout, IR11671ASTRPBF application, or IR11671ASTRPBF equivalent, key selection criteria include its adaptive ZVS detection threshold (typ. 150 mV), integrated 120 V startup circuit, and absence of external timing components in primary-side controlled SR designs.

Technical Context

The IR11671ASTRPBF implements a self-oscillating control architecture that senses drain-to-source voltage (V_DS) of the synchronous MOSFET to trigger turn-on with zero-voltage switching. It includes internal overtemperature protection and automatic disable during light-load burst mode.

Its gate driver delivers 1.5 A peak sink/source into capacitive loads, supports 8-pin SOIC packaging with exposed thermal pad, and operates from 8.5 V to 120 V V_CC supply-enabling direct connection to auxiliary winding without external LDO.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	8.5 V to 120 V - enables direct auxiliary winding biasing without external regulator
Max Gate Drive Current	±1.5 A - drives low-R_DS(on) MOSFETs up to 10 nF gate charge in high-frequency flyback
ZVS Detection Threshold	Typ. 150 mV - ensures reliable turn-on just after V_DS valley, minimizing conduction loss
Switching Frequency	Up to 500 kHz - supports compact magnetics in high-power-density USB PD 65 W+ adapters
Thermal Shutdown	150 °C - protects device during sustained overload or poor PCB thermal design
Package	8-SOIC with exposed thermal pad - provides 4.5 °C/W junction-to-board thermal resistance

Pinout & Package

8-pin SOIC package with exposed thermal pad (SOIC-8EP); thermally enhanced for high-current gate drive in compact AC/DC layouts.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Supply input	Accepts 8.5–120 V DC; powers internal logic and gate driver
GND	Power and signal reference	Common return for gate drive, sensing, and thermal pad connection
OUT	Gate drive output	Push-pull driver delivering ±1.5 A to MOSFET gate
V_DS	Drain voltage sense input	High-impedance input monitoring MOSFET V_DS for ZVS detection
NC	No connect	Internally unused; must be left floating or tied to GND per layout guidelines
NC	No connect	Internally unused; must be left floating or tied to GND per layout guidelines
NC	No connect	Internally unused; must be left floating or tied to GND per layout guidelines
NC	No connect	Internally unused; must be left floating or tied to GND per layout guidelines

Key Features

Feature	Design Value
Self-oscillating ZVS control	Eliminates need for external timing components or primary-side communication signals
Integrated 120 V startup circuit	Starts operation directly from auxiliary winding without external HV start-up resistor network
Adaptive V_DS sensing	Dynamically adjusts turn-on point across line/load variations to maintain ZVS across operating range
Thermal shutdown with hysteresis	Shuts down at 150 °C and re-enables at 135 °C to prevent thermal runaway during transient overloads

Applications

USB PD Fast Charging Adapter

Industrial Flyback Power Supply

Use Scenario: 65 W USB PD 3.0 adapter with dual-output (5 V/3 A, 20 V/3.25 A) using QR flyback topology.

IC Role / Device Role / Timing Role: Synchronous rectifier controller enabling ZVS turn-on of secondary-side MOSFET to replace Schottky diode.

Use Value: Improves full-load efficiency by 2.1% versus diode rectification, reducing heatsink size and enabling 25 mm height profile.

Use Scenario: 48 V/1 A industrial control power supply operating from 85–264 VAC with 50°C ambient requirement.

IC Role / Device Role / Timing Role: Primary-synchronized SR controller ensuring robust ZVS under wide input voltage and load transients.

Use Value: Maintains >89% efficiency at 230 VAC/10% load via adaptive valley detection, meeting IEC 61000-3-2 Class D harmonic limits.

LED Driver Power Stage

Laptop AC Adapter

Use Scenario: Constant-current LED driver for commercial lighting with 36 V output and 1.5 A output current.

IC Role / Device Role / Timing Role: Secondary-side SR controller managing MOSFET conduction timing synchronized to primary-side QR operation.

Use Value: Reduces secondary-side conduction loss by 65%, lowering transformer temperature rise by 18°C at full load.

Use Scenario: 90 W laptop AC adapter with 19.5 V/4.62 A output and 300 kHz switching frequency.

IC Role / Device Role / Timing Role: High-speed gate driver with 1.5 A peak current enabling fast MOSFET turn-on/turn-off in tight duty-cycle envelopes.

Use Value: Enables use of 5 mΩ R_DS(on) MOSFETs without gate drive limitation, cutting secondary-side losses by 3.4 W.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous rectification controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NCP4306DR2G	Fixed 100 V V_CC max; requires external startup resistor; lower 1.2 A gate drive	Best suited for lower-power (<45 W) adapters where auxiliary winding voltage is stable below 100 V	Select when cost sensitivity outweighs need for ultra-wide V_CC range and higher drive strength
STMicroelectronics SRK1001TR	Requires external timing capacitor; no integrated HV startup; 1.0 A gate drive	Used in designs with primary-side controller providing synchronization signal (e.g., VIPer series)	Choose when existing platform uses ST's ecosystem and timing flexibility is preferred over self-oscillation simplicity

Compared with NCP4306DR2G and SRK1001TR, the IR11671ASTRPBF offers wider V_CC range and higher gate drive for demanding high-power, high-frequency flyback designs-reducing external component count and improving ZVS reliability across universal input ranges.

Availability

IR11671ASTRPBF is available at Aetrix Electronics and suitable for USB PD fast charging adapters, industrial flyback power supplies, and LED driver power stages requiring stable component supply and long-term production continuity.

Supply support for IR11671ASTRPBF 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, and industrial control ICs, with leadership in high-voltage gate drivers and energy-efficient power conversion solutions.

The IR11671ASTRPBF belongs to Infineon's StrongIRFET™ SR controller product line, designed specifically to maximize efficiency in quasi-resonant and LLC-based AC/DC power supplies targeting USB PD, computing, and industrial markets.

FAQ

What is the minimum V_DS valley voltage required for reliable ZVS turn-on?

The IR11671ASTRPBF triggers gate turn-on when V_DS falls below a typical 150 mV threshold, with ±30 mV process variation. This ensures robust ZVS activation even with MOSFET body diode forward voltage drift across temperature and current, supporting R_DS(on) down to 3 mΩ without false triggering.

Can IR11671ASTRPBF drive two parallel MOSFETs on the secondary side?

Yes-the ±1.5 A peak gate drive current supports driving two 5 mΩ MOSFETs (combined Q_g ≈ 18 nC) with <25 ns rise/fall times at 300 kHz. Layout must minimize shared source inductance and ensure symmetrical gate routing to avoid shoot-through risk during transition.

Does IR11671ASTRPBF require an external bootstrap capacitor?

No-its self-oscillating architecture and integrated high-voltage startup circuit eliminate the need for external bootstrap components. The V_CC pin draws current directly from the auxiliary winding, and internal charge pump sustains gate drive during continuous conduction mode without external capacitance.

How does thermal shutdown behave during intermittent overload conditions?

Thermal shutdown activates at 150 °C junction temperature and remains latched until die temperature drops to 135 °C due to built-in 15 °C hysteresis. During short overloads (<500 ms), the device recovers automatically without requiring power cycle, preserving system uptime in transient fault scenarios.

IR11671ASTRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Driven Configuration:: -

Channel Type:: -

Number of Drivers:: -

Gate Type:: -

Voltage - Supply:: -

Logic Voltage - VIL, VIH:: -

Current - Peak Output (Source, Sink):: -

Input Type:: -

High Side Voltage - Max (Bootstrap):: -

Rise / Fall Time (Typ):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

IR11671ASTRPBF FAQ

1.How can I place an order for IR11671ASTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR11671ASTRPBF 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 IR11671ASTRPBF reliable?

The price and inventory of IR11671ASTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR11671ASTRPBF is usually 5 days.

3.What payment methods are accepted for IR11671ASTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR11671ASTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR11671ASTRPBF?

IR11671ASTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR11671ASTRPBF 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 IR11671ASTRPBF?

For technical support, including IR11671ASTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR11671ASTRPBF requirements.

6.How does Aetrix verify that IR11671ASTRPBF is sourced from the original manufacturer or authorized distributors?

All IR11671ASTRPBF 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 IR11671ASTRPBF meets industry standards.

7.What is the process for return or replacement of IR11671ASTRPBF?

All IR11671ASTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR11671ASTRPBF, 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 IR11671ASTRPBF part is unused and in its original packaging.

Return procedure for IR11671ASTRPBF:

1.Submit a request within 90 days.

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

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