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

Infineon Technologies IR3801AMTRPBF

Name: IR3801AMTRPBF
Brand: Infineon Technologies
SKU: IR3801AMTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3801AMTRPBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3801AMTRPBF.pdf

Description:: IC REG BUCK ADJ 9A PQFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,400

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Product details

Overview

IR3801AMTRPBF from Infineon Technologies is a highly integrated synchronous buck regulator with integrated high- and low-side MOSFETs, delivering up to 9A continuous output current across 0.6V–12V output range at 300kHz fixed switching frequency. It operates from 2.5V–21V input, features precision 0.6V reference, programmable over-current protection, and pre-bias startup-used in graphics card VRMs and embedded point-of-load systems.

For engineers reviewing the IR3801AMTRPBF datasheet, IR3801AMTRPBF pinout, IR3801AMTRPBF application, or IR3801AMTRPBF equivalent, key selection criteria include its thermally enhanced 5mm×6mm QFN package, dual UVLO thresholds (VCC/VC), hiccup-mode current limiting, and AGnd/PGnd separation for noise-sensitive analog control loop stability.

Technical Context

The IR3801AMTRPBF implements voltage-mode PWM control with a fixed 300kHz oscillator and internal sawtooth ramp generator, eliminating external timing components. Its error amplifier compares FB voltage against a trimmed 0.6V reference, driving gate drivers via trailing-edge modulation.

Current sensing uses R_DS(on) of the internal low-side MOSFET (10.5–13.4mΩ typ.), enabling resistorless over-current detection. Protection includes non-latching thermal shutdown at 140°C (20°C hysteresis), VCC/VC UVLO with independent rising/falling thresholds, and soft-start/shutdown via SS pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5V to 21V - supports wide-input industrial and computing rails including 12V and 19V adapters.
Output Voltage Range	0.6V to 12V - enables core voltage regulation down to sub-1V CPU/GPU domains with ±2% FB accuracy.
Continuous Output Current	9A - sustained delivery under thermal limits using 5mm×6mm QFN with exposed thermal pad.
Switching Frequency	300kHz (270–330kHz) - balances efficiency and EMI while allowing compact 1.2μH inductors.
Reference Voltage	0.6V ±2% - sets output via external resistor divider; enables precise low-V_OUT regulation.
Thermal Shutdown Threshold	140°C with 20°C hysteresis - prevents latch-up during transient overload; auto-recovery on cooldown.
Soft-Start Current	15–28μA - determines ramp time via external capacitor; supports controlled power-up into pre-biased loads.

Pinout & Package

IR3801AMTRPBF uses a thermally enhanced 15-pin Power QFN package (5mm × 6mm, 0.5mm pitch) with exposed thermal pad for PCB-level heat dissipation. Signal and power grounds are physically separated to minimize noise coupling into the feedback loop.

Pin/Terminal	Circuit Role	Design Meaning
1, 9	NC	No internal connection; must be left floating or grounded per layout best practice.
2	FB	Inverting input of error amplifier; connects to output divider to set V_OUT = 0.6V × (1 + R1/R2).
3	COMP	Error amplifier output; used for loop compensation with external RC network.
4, 5, 15	AGnd	Analog ground reference for internal reference, error amp, and control circuitry; must tie to quiet ground plane.
6	SS/SD	Soft-start timing and shutdown control; capacitor sets ramp time; <0.3V forces shutdown.
7	OCSet	Current limit programming node; resistor to SW sets hiccup-mode trip threshold (15–26μA).
8	VCC	Bias supply for logic and low-side driver; requires ≥0.1μF ceramic cap to PGnd.
10	PGnd	Power ground return for MOSFET drivers; separate from AGnd to avoid switching noise injection.
11	SW	Switch node connecting internal FETs to external inductor; high di/dt path requiring tight layout.
12	VIN	Main input supply (2.5–21V); feeds high-side driver bootstrap and internal regulators.
13	HG	High-side gate driver output; connects to HS FET gate via small series resistor/capacitor.
14	VC	Bootstrap supply for high-side driver; must be ≥VIN + 5V (up to 28V); requires ≥0.1μF cap to PGnd.

Key Features

Feature	Design Value
Integrated Dual MOSFETs	Top/bottom R_DS(on) = 10.5–13.4mΩ each - eliminates external FETs and sense resistors, reducing BOM count and board area.
Pre-Bias Startup	Enables safe start into pre-charged outputs without oscillation - critical for hot-swap and multi-rail sequencing.
Programmable Hiccup OCP	External resistor sets current limit; hiccup mode (15% duty) limits fault energy and enables self-recovery.
Separated AGnd/PGnd	Dedicated analog and power ground pins - isolates sensitive feedback path from high-current switching return paths.
Fixed 300kHz Frequency	On-chip oscillator eliminates external timing components - improves design repeatability and reduces EMI tuning effort.

Applications

Graphics Card VRM

Desktop PC Core Regulator

Use Scenario: Delivering stable 0.8–1.3V @ 6–9A to GPU cores under dynamic load transients.

IC Role / Device Role / Timing Role: Primary synchronous buck controller with integrated FETs and fast transient response.

Use Value: Pre-bias startup avoids output collapse during PCIe hot-plug; hiccup OCP protects against short-circuit faults without latching.

Use Scenario: Regulating CPU V_DD rail from 12V input in ATX-based motherboards.

IC Role / Device Role / Timing Role: Point-of-load regulator with programmable soft-start for power sequencing compliance.

Use Value: 0.6V reference and ±2% FB accuracy enable tight core voltage tolerance; 5mm×6mm QFN fits dense motherboard layouts.

Embedded System PoL

Set-Top Box Power Management

Use Scenario: Generating 3.3V or 5V from 12V intermediate bus in industrial controllers.

IC Role / Device Role / Timing Role: Standalone DC/DC converter with thermal shutdown and UVLO for unattended operation.

Use Value: Dual UVLO (VCC/VC) ensures reliable start-up only when both bias supplies are valid; 140°C thermal cutoff prevents damage in sealed enclosures.

Use Scenario: Supplying 1.2V/1.8V to SoC and memory in consumer media devices.

IC Role / Device Role / Timing Role: High-efficiency buck regulator with low quiescent current (7–13mA static ICC).

Use Value: AGnd/PGnd separation maintains signal integrity in noisy audio/video environments; RoHS-compliant Pb-free QFN meets global regulatory requirements.

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)	4.5–18V input, 12A output, 500kHz switching, no VC pin - uses charge pump instead of bootstrap.	Lacks separate VC supply; less suitable for ultra-low-V_OUT with high VIN due to lower duty-cycle limit.	Preferred where higher current and smaller inductors are needed, but requires re-evaluation of gate drive architecture.
TPS549D22 (Texas Instruments)	4.5–16V input, 9A, D-CAP3 control, integrated LDO for VC, 1.5MHz switching.	Faster transient response and higher frequency allow smaller magnetics, but higher EMI and tighter layout constraints.	Best for designs prioritizing dynamic performance over thermal simplicity; requires different compensation strategy.

Compared with MP8765GQ-Z and TPS549D22, the IR3801AMTRPBF offers superior thermal robustness via dedicated VC bias and exposed QFN pad, simpler gate drive (external bootstrap), and proven reliability in graphics and desktop platforms - making it optimal for cost-sensitive, thermally constrained PoL applications.

Availability

IR3801AMTRPBF is available at Aetrix Electronics and suitable for graphics card VRMs, desktop PC core regulators, and embedded point-of-load systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IR3801AMTRPBF 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 leader specializing in power management, automotive ICs, and industrial control solutions, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The SupIRBuck™ product line delivers fully integrated, high-current DC/DC regulators targeting space-constrained computing and consumer electronics, emphasizing thermal efficiency, ease of use, and system-level protection.

FAQ

What is the minimum recommended output capacitance for stable operation at 9A?

The IR3801AMTRPBF datasheet specifies a minimum 120μF total output capacitance using low-ESR ceramic or polymer capacitors. This value ensures sufficient phase margin and transient response for full-load step changes. Layout must minimize trace inductance between PGnd, VIN, and output caps to prevent instability or overshoot during load transients.

Can the IR3801AMTRPBF operate with an input voltage below 4.5V?

Yes - the absolute minimum VIN is 2.5V per Absolute Maximum Ratings, and functional operation is specified down to 2.5V. However, output current capability decreases below 4.5V due to reduced gate drive headroom and increased conduction losses; full 9A rating requires VIN ≥4.5V per Recommended Operating Conditions.

How is the over-current threshold programmed using the OCSet pin?

A resistor from OCSet to SW sets the hiccup current limit: R_OCSET = V_RAMP / I_OCSET, where V_RAMP = 1.25V (internal ramp amplitude) and I_OCSET = 15–26μA (typical). For example, a 47kΩ resistor yields ~26.6μA, corresponding to ~9A limit with typical R_DS(on) and sense gain.

Is the AGnd/PGnd separation mandatory, or can they be tied together on the PCB?

AGnd and PGnd must remain separate on the PCB and connect only at a single point near the device's thermal pad or input capacitor ground. Tying them directly compromises noise rejection in the feedback loop, causing output ripple increase and potential instability - confirmed by layout guidelines in the IR3801A application note AN-1171.

IR3801AMTRPBF 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:: 9A

Frequency - Switching:: 300kHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PQFN (5x6)

IR3801AMTRPBF FAQ

1.How can I place an order for IR3801AMTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3801AMTRPBF 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 IR3801AMTRPBF reliable?

The price and inventory of IR3801AMTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3801AMTRPBF is usually 5 days.

3.What payment methods are accepted for IR3801AMTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3801AMTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3801AMTRPBF?

IR3801AMTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3801AMTRPBF 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 IR3801AMTRPBF?

For technical support, including IR3801AMTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3801AMTRPBF requirements.

6.How does Aetrix verify that IR3801AMTRPBF is sourced from the original manufacturer or authorized distributors?

All IR3801AMTRPBF 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 IR3801AMTRPBF meets industry standards.

7.What is the process for return or replacement of IR3801AMTRPBF?

All IR3801AMTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3801AMTRPBF, 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 IR3801AMTRPBF part is unused and in its original packaging.

Return procedure for IR3801AMTRPBF:

1.Submit a request within 90 days.

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

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