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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Infineon Technologies IR3811MTRPBF

Name: IR3811MTRPBF
Brand: Infineon Technologies
SKU: IR3811MTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3811MTRPBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3811MTRPBF.pdf

Description:: IC REG BUCK ADJ 7A PQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IR3811MTRPBF from Infineon Technologies is a highly integrated synchronous buck regulator with integrated high- and low-side MOSFETs, delivering continuous 7A output current across 2.5V–21V input and 0.6V–12V output ranges, operating at fixed 600kHz switching frequency, and featuring programmable over-current protection, pre-bias startup, and thermal shutdown-used in DDR memory termination (VTT) and point-of-load regulation for graphics cards and server VRMs.

For engineers reviewing the IR3811MTRPBF datasheet, IR3811MTRPBF pinout, IR3811MTRPBF application, or IR3811MTRPBF equivalent, key selection criteria include its 7A continuous load capability, 0.6V precision reference, hiccup-mode current limiting, tracking support for VTT generation, and thermally enhanced 5mm×6mm QFN-15 package with separated AGnd/PGnd planes.

Technical Context

The IR3811MTRPBF implements voltage-mode PWM control with a fixed 600kHz oscillator and internal error amplifier (transconductance: 1000–1600 μmho, input offset ±4.5mV), using R_DS(on)-based current sensing (10.5–13.4 mΩ top/bottom MOSFETs) instead of external sense resistors. Its feedback loop accepts either internal 0.6V reference or external tracking voltage via Vp pin.

It supports dual-supply operation: Vcc (4.5–14V) powers control logic and low-side driver; Vc (Vin + 5V, up to 28V) powers the charge-pump high-side driver. Under-voltage lockout triggers at Vcc_UVLO(F) = 3.7–4.1V and VC_UVLO(F) = 2.85–3.25V, with hysteresis of 0.15–0.3V per rail.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5V to 21V - supports wide-input industrial and computing rails including 3.3V, 5V, 12V, and 19V adapters.
Output Current	Continuous 7A - enables single-chip PoL for DDR memory, GPU core, or CPU I/O domains without external current sharing.
Switching Frequency	Fixed 600kHz (540–660kHz) - allows compact 1μH inductors and reduces EMI filtering burden vs. lower-frequency alternatives.
Reference Voltage	0.6V ±1.5% (–40°C to +105°C) - enables accurate 1.2V, 1.8V, or 3.3V outputs with standard resistor dividers; critical for DDR VDDQ/VTT stability.
Current Limit Method	R_DS(on)-based sensing with OCSet pin - eliminates sense resistor, preserves efficiency, and enables programmable hiccup-mode trip (15–26μA setpoint).
Thermal Protection	140°C shutdown with 20°C hysteresis - prevents latch-up during transient overload; auto-recovery ensures system resilience without manual reset.
Startup Behavior	Pre-bias startup enabled - safely ramps output into pre-charged bus (e.g., DDR VTT rail), avoiding reverse current or oscillation.

Pinout & Package

Package: 5mm × 6mm Power QFN-15 with exposed thermal pad (JEDEC MO-220, MSL Level 3 @ 260°C). Thermally enhanced layout separates AGnd (pins 4, 5, 15) and PGnd (pin 10) to minimize noise coupling between analog reference and power return paths.

Pin/Terminal	Circuit Role	Design Meaning
1 Vp	Non-inverting error amp input	Accepts external tracking voltage (e.g., master VDDQ) for VTT generation; enables DDR memory termination without external op-amp.
2 Fb	Inverting error amp input	Connects to output divider; compares regulated output against 0.6V reference or Vp voltage to close feedback loop.
3 Comp	Error amplifier output	Drives external RC compensation network; sets phase margin and transient response for stable 7A load steps.
4,5,15 AGnd	Analog ground reference	Common return for Vref, Fb, Vp, SS, OCSet - must be star-connected to minimize offset errors in precision feedback path.
6 SS/SD	Soft-start / shutdown control	Capacitor-to-ground sets ramp time; <0.3V forces immediate shutdown - enables sequencing with other rails or fault isolation.
7 OCSet	Over-current threshold set	Resistor to SW pin programs hiccup current limit; sets trip point independent of temperature or input voltage drift.
8 VCC	Logic & low-side driver supply	Must be decoupled with ≥0.1μF HF capacitor to PGnd; UVLO (4.0–4.4V start) prevents erratic gate drive during brownout.
9 Vref	Internal reference output	2μA drive capability - connects directly to Vp for standalone regulation or floats for tracking mode; defines base 0.6V reference.
10 PGnd	Power ground return	Return path for high/low-side MOSFETs and SW node - requires low-inductance plane connection to minimize switching noise injection.
11 SW	Switch node	Connects to output inductor and OCSet resistor; carries full switching current and high dv/dt - critical for layout EMI control.
12 VIN	Main input supply	Accepts 2.5–21V; feeds both power stage and VCC regulator - requires bulk + HF input capacitance near pin.
13 HG	High-side gate driver output	Drives external high-side MOSFET gate (in bootstrapped configuration); connects to SW via small capacitor for charge-pump operation.
14 VC	High-side driver supply	Must be ≥Vin + 5V (up to 28V); decoupled with ≥0.1μF HF cap to PGnd; UVLO (3.1–3.5V start) ensures robust high-side turn-on.

Key Features

Feature	Design Value
Integrated dual MOSFET power stage	Eliminates discrete high/low-side FETs and drivers - reduces BOM count by ≥6 components and PCB area by >40% vs. controller+discrete solution.
Programmable hiccup over-current protection	Configurable trip threshold via OCSet resistor - avoids destructive latch-off during short-circuit while enabling safe auto-recovery.
Vp-based tracking capability	Direct Vp connection to master rail (e.g., DDR VDDQ) enables precise ½-VDDQ VTT generation without external error amplifier or divider.
Pre-bias startup support	Enables reliable power-up into pre-charged output (e.g., hot-plug memory modules) - prevents reverse current flow and output collapse.
Separated AGnd/PGnd planes	Minimizes noise coupling between sensitive analog feedback and noisy power return - improves regulation accuracy under dynamic 7A load steps.

Applications

DDR Memory Termination (VTT)

GPU Core Voltage Regulation

Use Scenario: Generating matched termination voltage (VTT = ½ VDDQ) for DDR3/DDR4 memory buses in servers and workstations.

IC Role / Device Role / Timing Role: Tracking regulator using Vp pin tied to VDDQ rail; delivers tightly regulated, low-noise VTT with fast transient response.

Use Value: Maintains VTT within ±15mV of ½ VDDQ across temperature and load, meeting JEDEC DDR timing margin requirements for signal integrity.

Use Scenario: Providing 0.8–1.2V core power to discrete GPUs in gaming PCs and AI accelerators with rapid load transients.

IC Role / Device Role / Timing Role: High-current synchronous buck converter with 7A continuous rating and 600kHz switching for compact inductor sizing.

Use Value: Delivers <1% output deviation during 5A/μs load steps, reducing need for large bulk capacitance and improving power delivery bandwidth.

Server Point-of-Load (POL)

Embedded System I/O Rail

Use Scenario: Distributed 1.8V or 3.3V power for PCIe switch, BMC, or baseboard management controllers in 1U rack servers.

IC Role / Device Role / Timing Role: Standalone buck regulator with programmable soft-start and thermal shutdown for unattended operation.

Use Value: Enables hot-swap capable POL with controlled inrush, hiccup fault recovery, and 125°C junction operation in constrained airflow environments.

Use Scenario: Powering FPGA I/O banks, ADC/DAC interfaces, or sensor hubs in industrial edge devices requiring stable low-noise supplies.

IC Role / Device Role / Timing Role: Precision 0.6V reference-based regulator with <±1.5% output accuracy over –40°C to +105°C.

Use Value: Ensures consistent logic thresholds and analog measurement accuracy across extended temperature range without calibration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP8765GQ-Z (Monolithic Power Systems)	6A rated, 2.5–18V input, 0.6–5.5V output, 750kHz switching, no Vp tracking pin	Lacks dedicated Vp tracking input - requires external op-amp for DDR VTT; better suited for generic POL than memory-specific use.	Select when VTT tracking is unnecessary and higher switching frequency justifies trade-off in current rating.
TPS546D24RUKR (Texas Instruments)	10A rated, 3–18V input, 0.5–5.5V output, PMBus interface, 400–2MHz programmable frequency	Includes digital telemetry and sequencing - adds complexity and cost but enables real-time monitoring and dynamic voltage scaling.	Select when telemetry, multi-rail coordination, or adaptive frequency control outweighs need for analog simplicity and footprint minimization.

Compared with MP8765GQ-Z and TPS546D24RUKR, the IR3811MTRPBF offers optimal balance of integration (integrated MOSFETs + tracking), thermal performance (150°C max junction), and analog simplicity for DDR VTT and mid-power POL-without digital overhead or current derating.

Availability

IR3811MTRPBF is available at Aetrix Electronics and suitable for DDR memory termination, GPU core regulation, and server point-of-load applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for IR3811MTRPBF 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 electronics, and industrial control ICs, with leadership in silicon and silicon carbide power devices.

The IR3811 belongs to Infineon's SupIRBuck™ family-designed specifically for space-constrained, high-efficiency DC/DC conversion in computing and memory subsystems where integration, thermal performance, and tracking capability are critical.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The IR3811MTRPBF is rated for continuous operation up to 125°C junction temperature under recommended operating conditions. Absolute maximum junction temperature is 150°C, but thermal shutdown activates at 140°C with 20°C hysteresis to prevent sustained overstress. Layout with adequate copper pour on the exposed thermal pad is required to maintain this rating at 7A load.

Can the IR3811MTRPBF operate without an external compensation network on the COMP pin?

No. The COMP pin is the error amplifier output and requires an external RC network (typically 1–10kΩ resistor and 100–1000pF capacitor to AGnd) to stabilize the control loop. Omitting compensation causes instability, oscillation, or poor transient response-especially under 7A load steps. The datasheet provides design guidelines and Bode plot examples for common output configurations.

How is the hiccup current limit threshold set using the OCSet pin?

The OCSet pin sinks 15–26μA (typical 20μA) when the sensed current exceeds the programmed limit. A resistor from OCSet to SW sets the threshold: R_OCSET = V_SW / I_OCSET. For example, with V_SW ≈ 0.2V during conduction and I_OCSET = 20μA, R = 10kΩ yields ~10A peak limit. The actual trip point depends on low-side R_DS(on) and temperature.

Does the IR3811MTRPBF support forced continuous conduction mode (FCCM) or only pulse-skipping?

The IR3811MTRPBF operates exclusively in forced continuous conduction mode (FCCM) due to its fixed-frequency voltage-mode PWM architecture. It does not enter discontinuous conduction mode (DCM) or pulse-skipping at light loads - ensuring constant 600kHz switching, predictable EMI profile, and stable regulation down to zero load, critical for memory and FPGA applications.

IR3811MTRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SupIRBuck®

Package/Case:: 15-PowerVQFN

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.5V

Voltage - Input (Max):: 21V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 12V

Current - Output:: 7A

Frequency - Switching:: 600kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PQFN (5x6)

IR3811MTRPBF FAQ

1.How can I place an order for IR3811MTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3811MTRPBF 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 IR3811MTRPBF reliable?

The price and inventory of IR3811MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3811MTRPBF is usually 5 days.

3.What payment methods are accepted for IR3811MTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3811MTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3811MTRPBF?

IR3811MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3811MTRPBF 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 IR3811MTRPBF?

For technical support, including IR3811MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3811MTRPBF requirements.

6.How does Aetrix verify that IR3811MTRPBF is sourced from the original manufacturer or authorized distributors?

All IR3811MTRPBF 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 IR3811MTRPBF meets industry standards.

7.What is the process for return or replacement of IR3811MTRPBF?

All IR3811MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3811MTRPBF, 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 IR3811MTRPBF part is unused and in its original packaging.

Return procedure for IR3811MTRPBF:

1.Submit a request within 90 days.

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

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