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

Infineon Technologies IR3840MTR1PBF

Name: IR3840MTR1PBF
Brand: Infineon Technologies
SKU: IR3840MTR1PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3840MTR1PBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3840MTR1PBF.pdf

Description:: IC REG BUCK ADJ 12A PQFN

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Product details

Overview

IR3840MTR1PBF from Infineon Technologies is a highly integrated 12A synchronous buck regulator with co-packaged high- and low-side MOSFETs, PWM controller, and bootstrap diode in a 5mm × 6mm Power QFN package. It delivers 0.7V–0.9×Vin output across 1.5V–16V input, achieves >96% peak efficiency, supports programmable 225–1650kHz switching frequency, and features precision 0.7V ±1% reference for server point-of-load applications.

For engineers reviewing the IR3840MTR1PBF datasheet, IR3840MTR1PBF pinout, IR3840MTR1PBF application, or IR3840MTR1PBF equivalent, key selection considerations include its integrated power stage, hiccup-mode overcurrent protection, pre-bias startup capability, thermal shutdown at 140°C, and sequencing support via the Seq pin for multi-rail systems.

Technical Context

The IR3840 implements a voltage-mode PWM control architecture with a high-bandwidth error amplifier (GBWP: 20–40MHz, slew rate: 7–20V/μs) and programmable fixed-off-time oscillator. Its internal compensation node (Comp) enables loop stability tuning via external RC networks connected to Fb.

It integrates dual MOSFETs with R_DS(on) of 8.3mΩ (high-side) and 5.9mΩ (low-side) at T_j = 25°C, supports tracking via the Seq pin using resistor dividers, and provides open-drain PGood with 83–93% V_REF threshold and 256/F_s delay timing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Continuous 12A load capability - supports high-current CPU/GPU core rails without external current sharing.
Input Voltage Range	1.5V to 16V - compatible with 3.3V, 5V, 12V intermediate bus architectures in telecom and storage systems.
Output Voltage Range	0.7V to 0.9×Vin - enables sub-1V core supplies with adaptive scaling for modern processors.
Switching Frequency	225kHz to 1650kHz - adjustable via Rt pin resistor; higher frequencies reduce output filter size, lower frequencies improve light-load efficiency.
Reference Voltage	0.7V ±1% (0°C–125°C), ±2% (–40°C–125°C) - ensures tight output regulation across industrial temperature range.
Efficiency	>96% maximum - achieved via integrated low-R_DS(on) MOSFETs and optimized gate drive, minimizing conduction and switching losses.
Junction Temperature	–40°C to +125°C - rated for continuous operation in thermally constrained server and embedded telecom environments.

Pinout & Package

IR3840MTR1PBF uses a 15-pin 5mm × 6mm Power QFN package with 0.9mm height, exposed thermal pad (PGnd-connected), and RoHS-compliant lead-free finish.

Pin/Terminal	Circuit Role	Design Meaning
1 Seq	Sequencing input	Enables voltage-tracking during power-up using external resistors; tied to Vcc if unused.
2 Fb	Error amplifier inverting input	Connects to output divider to set regulated voltage; determines feedback accuracy and loop stability.
3 Comp	Error amplifier output	Interface for external compensation network (R+C to Fb); directly affects transient response and phase margin.
4,15 Gnd	Signal ground	Reference return for internal bias and control circuitry; must be separated from PGnd for noise immunity.
5 Rt	Frequency set input	Resistor-to-ground sets switching frequency (225–1650kHz); enables optimization for EMI or efficiency.
6 SS/SD	Soft-start/shutdown	Capacitor-to-ground programs startup ramp time; pulled low (<0.3V) forces shutdown.
7 OCSet	Overcurrent threshold	Resistor from OCSet to SW sets hiccup-mode current limit; scales with switching frequency.
8 PGood	Power-good status	Open-drain output indicating valid output voltage; requires external pull-up to Vcc.
9 Vcc	Bias supply input	Powers internal logic and drivers; requires ≥1μF high-frequency ceramic capacitor to PGnd.
10 PGnd	Power ground	Dedicated return for MOSFET drivers; must connect to system power ground plane, not signal ground.
11 SW	Switch node	Connection point between internal MOSFETs and external inductor; carries high dv/dt switching waveform.
12 Vin	Main input supply	Accepts 1.5V–16V input; feeds high-side MOSFET and internal LDO for Vcc generation.
13 Boot	High-side driver supply	Requires 0.1μF capacitor to SW; enables floating gate drive for N-channel high-side MOSFET.
14 Enable	Enable input	UVLO thresholds (1.14–1.36V start, 0.9–1.06V stop) allow precise turn-on control with hysteresis.

Key Features

Feature	Design Value
Integrated power stage	Co-packaged 8.3mΩ/5.9mΩ MOSFETs eliminate external discrete FET layout complexity and parasitic mismatch.
Programmable hiccup OCP	Hiccup-mode current limiting with 4096-cycle off-time prevents thermal runaway during sustained overload.
Enhanced pre-bias startup	Allows safe startup into pre-biased output without reverse current flow or output voltage overshoot.
Tracking sequencing support	Seq pin enables synchronized ramp-up with other regulators using simple resistor-divider networks.
Thermal protection	Thermal shutdown triggers at 140°C junction temperature with 20°C hysteresis for reliable fault recovery.

Applications

Server Core Voltage Regulation

Storage Controller Power Supply

Use Scenario: Delivering stable 0.85V @ 10A to x86 CPU cores in 1U rack servers with strict thermal envelope limits.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load transients up to 5A/μs while maintaining ±1% output tolerance.

Use Value: Integrated MOSFETs and high-bandwidth E/A enable sub-100ns response to load steps, reducing required output capacitance by 30% versus discrete solutions.

Use Scenario: Powering NVMe SSD controllers requiring 1.1V @ 6A with sequencing relative to 3.3V I/O rails in enterprise storage enclosures.

IC Role / Device Role / Timing Role: Sequenced point-of-load regulator using Seq pin to track upstream 3.3V rail within ±2% timing alignment.

Use Value: Programmable soft-start and hiccup OCP prevent inrush current damage during hot-plug events and sustain reliability under intermittent short-circuit faults.

Embedded Telecom Baseband Processing

Distributed PoL in Network Switches

Use Scenario: Generating 1.0V @ 8A for FPGA-based baseband processors in outdoor small-cell radios operating from –40°C to +85°C ambient.

IC Role / Device Role / Timing Role: High-efficiency buck converter with extended temperature rating and thermal shutdown for uncooled deployments.

Use Value: >96% peak efficiency and 125°C max junction rating minimize heatsink requirements and extend field lifetime in sealed enclosures.

Use Scenario: Providing isolated 1.8V @ 12A rails to ASICs on line cards in modular Ethernet switches with space-constrained PCB layouts.

IC Role / Device Role / Timing Role: Compact 5mm × 6mm integrated regulator replacing 2-chip controller+driver solutions to save board area.

Use Value: Single-package integration reduces BOM count by 7 components and eliminates gate-drive loop routing, improving EMI performance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2315DJ-LF-Z	6A rated, smaller 3mm × 4mm QFN, no integrated bootstrap diode, fixed 500kHz frequency.	Limited to mid-power applications; lacks sequencing, pre-bias startup, and wide frequency adjustability.	Select when cost and footprint are prioritized over programmability and 12A capability.
TPS544B20RVFT	12A, 4mm × 4mm HotRod QFN, D-CAP2 control, no Seq pin, requires external bootstrap diode.	Superior transient response but no hardware-based voltage tracking; different compensation methodology.	Prefer for fast-transient digital loads where D-CAP2's zero-external-compensation advantage outweighs sequencing needs.

Compared with MP2315DJ-LF-Z and TPS544B20RVFT, IR3840MTR1PBF uniquely combines 12A capacity, integrated bootstrap diode, hardware sequencing (Seq), and pre-bias startup-making it optimal for complex, multi-rail server and telecom PoL systems requiring robustness and design flexibility.

Availability

IR3840MTR1PBF is available at Aetrix Electronics and suitable for server applications, storage applications, and embedded telecom systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for IR3840MTR1PBF 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 silicon and silicon carbide power devices.

The IR3840 belongs to Infineon's SupIRBuck™ family of integrated synchronous buck regulators, designed specifically for high-density, high-efficiency point-of-load conversion in datacenter and communications infrastructure.

FAQ

What is the minimum recommended output capacitance for stable operation at 12A?

The IR3840MTR1PBF datasheet specifies a minimum 220μF total output capacitance using low-ESR ceramic or polymer capacitors. This value ensures sufficient energy storage for 5A/μs load steps and maintains <1% output deviation under full-load transient conditions. Layout-dependent ESL must remain below 300pH to avoid instability.

Can the IR3840MTR1PBF operate with an input voltage below 1.5V?

No. The absolute minimum input voltage is 1.5V per the Recommended Operating Conditions table. Operation below this level risks failure to initiate switching, improper gate drive, or undervoltage lockout activation. The device will not regulate or deliver output current at Vin < 1.5V.

How is the overcurrent protection threshold calculated from the OCSet resistor?

The OCSet pin current (IOCSET) ranges from 43μA at 500kHz to 172μA at 1500kHz. The current-limit threshold is determined by IOCSET × R_OCSET, where R_OCSET is the resistor from OCSet to SW. For example, at 500kHz with IOCSET = 48.8μA and R_OCSET = 10kΩ, the threshold is ~488mA sensed across the low-side MOSFET's R_DS(on).

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

Yes. The exposed thermal pad is internally bonded to PGnd and must be soldered to a dedicated PGnd copper pour on the PCB. This connection provides both thermal dissipation and low-inductance return path for high-current switching loops-failure to connect it degrades efficiency and may trigger thermal shutdown under load.

IR3840MTR1PBF 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):: 0.7V

Voltage - Output (Max):: 14.4V

Current - Output:: 12A

Frequency - Switching:: 225kHz ~ 1.65MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PQFN (5x6)

IR3840MTR1PBF FAQ

1.How can I place an order for IR3840MTR1PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3840MTR1PBF 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 IR3840MTR1PBF reliable?

The price and inventory of IR3840MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3840MTR1PBF is usually 5 days.

3.What payment methods are accepted for IR3840MTR1PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3840MTR1PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3840MTR1PBF?

IR3840MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3840MTR1PBF 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 IR3840MTR1PBF?

For technical support, including IR3840MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3840MTR1PBF requirements.

6.How does Aetrix verify that IR3840MTR1PBF is sourced from the original manufacturer or authorized distributors?

All IR3840MTR1PBF 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 IR3840MTR1PBF meets industry standards.

7.What is the process for return or replacement of IR3840MTR1PBF?

All IR3840MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3840MTR1PBF, 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 IR3840MTR1PBF part is unused and in its original packaging.

Return procedure for IR3840MTR1PBF:

1.Submit a request within 90 days.

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

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