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

Infineon Technologies IR3840AMTR1PBF

Name: IR3840AMTR1PBF
Brand: Infineon Technologies
SKU: IR3840AMTR1PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3840AMTR1PBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3840AMTR1PBF.pdf

Description:: IC REG BUCK ADJ 14A PQFN

Quantity:: RFQ Add To RFQ list

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Inventory:4,278

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Product details

Overview

IR3840AMTR1PBF from Infineon Technologies is a highly integrated 14A synchronous buck regulator with internal high- and low-side MOSFETs, programmable switching frequency (250–1000 kHz), precision 0.7V ±1% reference, and integrated bootstrap diode. It delivers up to 96% efficiency at 12V_IN/1.8V_OUT/14A in server point-of-load applications.

For engineers reviewing the IR3840AMTR1PBF datasheet, IR3840AMTR1PBF pinout, IR3840AMTR1PBF application, or IR3840AMTR1PBF equivalent, key selection factors include its wide 1.5–16V input range, hiccup-mode overcurrent protection, pre-bias start-up capability, and thermal shutdown with 140°C trip point - all critical for high-density computing power delivery.

Technical Context

The IR3840AMTR1PBF implements a voltage-mode PWM controller with high-bandwidth error amplifier (GBWP: 20–40 MHz, slew rate: 7–20 V/μs) and fixed off-time deadband control (5–30 ns). Its integrated power stage features top-switch R_DS(on) = 8.4–10.6 mΩ and bottom-switch R_DS(on) = 5.7–6.9 mΩ at T_J = 25°C, enabling efficient operation across 0.7–0.9×V_IN output range.

It supports system-level sequencing via the Seq pin, programmable soft-start (via external capacitor on SS/SD), and precise power-good monitoring with upper/lower thresholds (0.77–0.84 V / 0.56–0.63 V) and 256/F_S delay. The device operates from –40°C to +125°C junction temperature and includes under-voltage lockout on both V_CC (4.15 V start) and Enable (1.2 V start).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Continuous 14 A - supports high-current CPU/GPU core rails without external current sharing.
Input Voltage Range	1.5 V to 16 V - compatible with 3.3 V, 5 V, 12 V intermediate bus architectures.
Output Voltage Range	0.7 V to 0.9×V_IN - enables sub-1 V core supplies with adaptive tracking.
Switching Frequency	250 kHz to 1.0 MHz - adjustable via RT resistor for optimal size/efficiency trade-off.
Reference Accuracy	0.7 V ±1% (0–125°C) - ensures tight output regulation under load and temperature variation.
Thermal Shutdown	140°C trip with 20°C hysteresis - prevents latch-up during sustained overload or airflow loss.
Efficiency Peak	>96% at 12 V_IN/1.8 V_OUT/14 A - reduces thermal load in dense server PCB layouts.

Pinout & Package

IR3840AMTR1PBF uses a thermally enhanced 5 mm × 6 mm Power QFN package with 0.9 mm height, 15-pin layout, exposed thermal pad (PGnd-connected), and RoHS-compliant lead-free finish.

Pin/Terminal	Circuit Role	Design Meaning
1 Seq	Sequencing control input	Enables simultaneous or staggered power-up with other regulators using external resistor divider.
2 FB	Error amplifier inverting input	Connects to output voltage divider to set regulated V_OUT; determines feedback loop stability.
3 Comp	Error amplifier output	Interface for external compensation network (R+C) to tune transient response and phase margin.
4,15 Gnd	Signal ground reference	Provides low-noise return for internal bias and control circuitry; must be separated from PGnd.
5 Rt	Oscillator timing input	Resistor-to-ground sets switching frequency (e.g., 28.7 kΩ → 500 kHz typical).
6 SS/SD	Soft-start/shutdown control	Capacitor-to-ground sets ramp time; pulled low (<0.3 V) forces immediate shutdown.
7 OCSet	Overcurrent threshold setting	Resistor from OCSet to SW pin programs current limit (e.g., 48.8 μA typical at 500 kHz).
8 PGood	Open-drain power-good indicator	Signals valid output after V_FB crosses thresholds; requires external pull-up to V_CC.
9 V_CC	Internal IC supply	Powers control logic and gate drivers; requires ≥1 μF ceramic capacitor to PGnd.
10 PGnd	Power ground return	Low-inductance return path for MOSFET drivers; must connect directly to power plane under thermal pad.
11 SW	Switch node	Connects to inductor; carries high dv/dt switching waveform; requires tight layout to minimize EMI.
12 VIN	Main input voltage	Accepts 1.5–16 V; feeds high-side FET source and internal LDO for V_CC.
13 Boot	High-side driver supply	0.1 μF capacitor to SW provides floating gate drive voltage for top FET.
14 Enable	Startup enable input	UVLO threshold 1.2 V (rising); allows system-controlled turn-on with external resistor divider.

Key Features

Feature	Design Value
Integrated MOSFETs	Co-packaged 8.4 mΩ high-side and 5.7 mΩ low-side FETs eliminate external discrete selection and layout complexity.
Enhanced Pre-Bias Start-up	Allows safe startup into pre-charged output capacitors without reverse current or overshoot - essential for hot-swap systems.
Hiccup Current Limit	Auto-retry protection mode limits fault energy and prevents thermal runaway during sustained short-circuit conditions.
Programmable Soft-Start	Adjustable ramp time via external capacitor avoids inrush current stress on input bulk capacitors and upstream converters.
Thermal Protection	140°C junction shutdown with 20°C hysteresis ensures reliable recovery after transient thermal events without manual reset.

Applications

Server Core Voltage Regulation

Storage Controller Power

Use Scenario: Regulating 0.85 V @ 12 A for dual-socket Xeon SP processors in 1U rack servers with constrained airflow.

IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated core voltage with fast transient response to dynamic CPU load steps.

Use Value: 96% peak efficiency reduces board-level heat density by >2 W vs. comparable 12 A solutions, easing thermal management in high-density chassis.

Use Scenario: Powering NVMe SSD controller ASICs requiring 1.1 V @ 8 A with sequencing relative to 3.3 V I/O rail.

IC Role / Device Role / Timing Role: Sequenced synchronous buck converter synchronized via Seq pin to ensure proper power-up order and avoid latch-up.

Use Value: Integrated sequencing eliminates external timing ICs and reduces BOM count by two components while maintaining <100 μs inter-rail skew.

Embedded Telecom Baseband

Industrial FPGA Core Supply

Use Scenario: Supplying 0.95 V @ 10 A to multi-core baseband processors in fanless outdoor small cells operating from –40°C to +85°C ambient.

IC Role / Device Role / Timing Role: High-efficiency, wide-temperature-range DC/DC regulator with robust pre-bias start-up for cold-start field deployments.

Use Value: Guaranteed –40°C to +125°C junction operation and 1.2 V Enable UVLO enable reliable cold-weather startup without external supervision.

Use Scenario: Delivering 0.75 V @ 14 A to Xilinx Kintex Ultrascale+ FPGA fabric in industrial PLC backplanes with limited cooling.

IC Role / Device Role / Timing Role: High-current, low-V_OUT regulator with hiccup-mode OCP and thermal shutdown for unattended long-life operation.

Use Value: Thermal shutdown with 20°C hysteresis prevents repeated cycling during overload, extending system uptime and reducing maintenance frequency.

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)	12 A rated, 2.5–18 V_IN, 0.6–5.5 V_OUT, no integrated bootstrap diode, requires external bootstrap cap.	Lacks pre-bias start-up and Seq pin; better suited for non-sequenced, lower-current industrial rails.	Select when input voltage exceeds 16 V or when external bootstrap flexibility is preferred over integration.
TPS546D24RQF (Texas Instruments)	15 A rated, 3–18 V_IN, 0.5–2.5 V_OUT, PMBus interface, digital loop compensation, no integrated bootstrap diode.	Supports telemetry and dynamic voltage scaling but adds firmware overhead and layout complexity.	Select when digital monitoring, adaptive loop tuning, or multi-phase synchronization is required.

Compared with MP8765GQ-Z and TPS546D24RQF, the IR3840AMTR1PBF offers superior analog simplicity, integrated bootstrap diode, and seamless pre-bias operation - making it optimal for cost-sensitive, high-reliability analog point-of-load designs where digital overhead is unnecessary.

Availability

IR3840AMTR1PBF is available at Aetrix Electronics and suitable for server applications, storage subsystems, and embedded telecom systems requiring stable component supply, extended temperature support, and high-current analog regulation.

Supply support for IR3840AMTR1PBF 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, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The SupIRBuck™ product line delivers fully integrated, high-current synchronous buck regulators optimized for space-constrained, high-efficiency point-of-load applications in datacenter, networking, and computing infrastructure.

FAQ

What is the minimum recommended output capacitance for stable operation at 14 A?

The IR3840AMTR1PBF datasheet specifies a minimum 220 μF total output capacitance with ≤1.5 mΩ ESR for 1.8 V/14 A operation. This ensures <1% output voltage deviation during 0–14 A load steps and maintains phase margin above 45° with standard ceramic + polymer hybrid configurations.

Can the IR3840AMTR1PBF operate with an input voltage below 1.5 V?

No. The absolute minimum input voltage is 1.5 V per the Recommended Operating Conditions table. Operation below this violates the internal gate driver bias requirements and may cause erratic switching or failure to regulate. The device will not start or sustain regulation below 1.5 V even if V_CC is externally supplied.

How does the OCSet pin determine overcurrent threshold?

The OCSet pin senses current through an external resistor connected between OCSet and SW. The resulting current (e.g., 48.8 μA at 500 kHz) flows into the internal comparator, which triggers hiccup-mode limiting when sensed switch-node voltage exceeds the programmed threshold based on MOSFET R_DS(on) and resistor value.

Is the thermal pad (Pin 10 PGnd) electrically connected to internal power ground?

Yes. The exposed thermal pad is internally bonded to PGnd and must be soldered to a dedicated copper pour connected only to the power ground plane. It is not connected to signal Gnd (Pins 4 and 15), and mixing these grounds degrades noise immunity and thermal performance.

IR3840AMTR1PBF 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):: 1.5V

Voltage - Input (Max):: 16V

Voltage - Output (Min/Fixed):: 0.9V

Voltage - Output (Max):: 14.4V

Current - Output:: 14A

Frequency - Switching:: 225kHz ~ 1MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PQFN (5x6)

IR3840AMTR1PBF FAQ

1.How can I place an order for IR3840AMTR1PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3840AMTR1PBF 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 IR3840AMTR1PBF reliable?

The price and inventory of IR3840AMTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3840AMTR1PBF is usually 5 days.

3.What payment methods are accepted for IR3840AMTR1PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3840AMTR1PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3840AMTR1PBF?

IR3840AMTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3840AMTR1PBF 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 IR3840AMTR1PBF?

For technical support, including IR3840AMTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3840AMTR1PBF requirements.

6.How does Aetrix verify that IR3840AMTR1PBF is sourced from the original manufacturer or authorized distributors?

All IR3840AMTR1PBF 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 IR3840AMTR1PBF meets industry standards.

7.What is the process for return or replacement of IR3840AMTR1PBF?

All IR3840AMTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3840AMTR1PBF, 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 IR3840AMTR1PBF part is unused and in its original packaging.

Return procedure for IR3840AMTR1PBF:

1.Submit a request within 90 days.

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

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