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

Infineon Technologies IR3840AMTRPBF

Name: IR3840AMTRPBF
Brand: Infineon Technologies
SKU: IR3840AMTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3840AMTRPBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3840AMTRPBF.pdf

Description:: IC REG BUCK ADJ 14A PQFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,572

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Product details

Overview

IR3840AMTRPBF from Infineon Technologies is a highly integrated 14A synchronous buck regulator with integrated high- and low-side MOSFETs, programmable switching frequency (250–1000 kHz), precision 0.7V ±1% reference voltage, and hiccup-mode overcurrent protection. It delivers >96% peak efficiency at 12V_IN/1.8V_OUT/14A in server point-of-load applications.

For engineers reviewing the IR3840AMTRPBF datasheet, IR3840AMTRPBF pinout, IR3840AMTRPBF application, or IR3840AMTRPBF equivalent, key selection criteria include its 5mm × 6mm Power QFN package, programmable soft-start via external capacitor, pre-bias start-up capability, and thermal shutdown at 140°C with 20°C hysteresis.

Technical Context

The IR3840AMTRPBF implements a current-mode PWM control architecture with an integrated error amplifier (GBWP: 20–40 MHz, slew rate: 7–20 V/μs) and programmable ramp generator (1.8 V_p-p, 0.6 V offset). Its bootstrap-diode integration eliminates external diode requirements while supporting high-side gate drive up to 33V boot-to-SW differential.

It features dual ground separation (GND for signal, PGND for power), dedicated sequencing (Seq) input for tracking, and open-drain PGood with adjustable upper (0.77–0.84 V) and lower (0.56–0.63 V) thresholds referenced to FB, enabling precise power-rail monitoring in multi-rail systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Continuous 14A load capability supports high-density CPU/GPU core rail delivery without external current sharing.
Input Voltage Range	1.5V to 16V enables direct compatibility with 3.3V, 5V, 12V intermediate bus architectures.
Output Voltage Range	0.7V to 0.9×V_IN supports sub-1V core supplies (e.g., 0.9V @ 12V_IN) with tight regulation.
Switching Frequency	Programmable 250–1000 kHz via RT resistor allows optimization of size (inductor/capacitor) vs. efficiency/noise.
Reference Voltage	0.7V ±1% (0°C–125°C) ensures ±17 mV absolute output tolerance at 1.0V setting, critical for advanced logic rails.
Junction Temp Range	−40°C to +125°C operation supports deployment in thermally constrained server and telecom chassis environments.
Package	5mm × 6mm Power QFN, 0.9 mm height, 15-pin layout with exposed thermal pad for ≤35°C/W θ_JA.

Pinout & Package

IR3840AMTRPBF uses a 15-pin 5mm × 6mm Power QFN package with exposed thermal pad (PGND-connected) and 0.4 mm pitch. Pin 1 is Seq; pins 15 and 4 are GND (signal); pin 10 is PGND (power ground); pin 11 is SW (switch node).

Pin/Terminal	Circuit Role	Design Meaning
1 Seq	Sequencing control input	Enables simultaneous or staggered power-up with other regulators using external resistor divider; tied to VCC if unused.
2 FB	Error amplifier inverting input	Direct connection to output voltage divider sets regulated V_OUT; accuracy depends on reference (0.7V ±1%) and resistor tolerance.
3 Comp	Error amplifier output	Interface for external RC compensation network to stabilize loop response across load/transient conditions.
5 Rt	Oscillator timing input	Resistor-to-GND sets switching frequency: 59 kΩ → 250 kHz, 28.7 kΩ → 500 kHz, 14.3 kΩ → 1000 kHz.
6 SS/SD	Soft-start / shutdown control	Capacitor-to-GND sets startup time; <0.3V forces shutdown; supports pre-bias start-up during hot-swap events.
7 OCSet	Overcurrent threshold set	Resistor from OCSet to SW defines current limit: e.g., 50 μA at 500 kHz corresponds to ~24 A trip point.
8 PGood	Power-good status output	Open-drain flag asserts when FB reaches 0.77–0.84 V and deasserts at 0.56–0.63 V; requires external pull-up.
9 VCC	Internal IC supply	Must be decoupled with ≥1 μF high-frequency ceramic cap to PGND; UVLO activates at 3.95–4.35 V rising edge.
10 PGND	Power ground return	Dedicated low-inductance path for MOSFET drivers; must connect directly to PCB power ground plane, separate from signal GND.
11 SW	Switch node	Connects to output inductor; experiences full VIN–VOUT swing; requires low-inductance layout to minimize EMI.
12 VIN	Main input supply	Accepts 1.5–16V; absolute max rating is 25V DC; internal clamp protects against transient overshoot.
13 Boot	High-side gate driver supply	0.1 μF ceramic cap to SW provides floating bias; forward voltage ≤470 mV at 30 mA ensures robust high-side turn-on.
14 Enable	Startup enable input	UVLO threshold 1.14–1.36 V rising; leakage <15 μA; tied to VCC if always enabled.
4 & 15 GND	Signal ground reference	Two dedicated pins for analog/feedback circuitry grounding; must tie to common signal ground plane, isolated from PGND.

Key Features

Feature	Design Value
Integrated Bootstrap Diode	Eliminates external Schottky diode, reducing BOM count and layout area while maintaining >96% efficiency at full load.
Enhanced Pre-Bias Start-up	Allows safe startup into pre-charged output capacitors without reverse current flow or output voltage collapse.
Hiccup-Mode Overcurrent Protection	Auto-retry fault recovery limits thermal stress during sustained overload or short-circuit, improving system reliability.
Programmable Soft-Start	External capacitor sets monotonic output ramp time, preventing inrush current and ensuring controlled power sequencing.
Thermal Protection with Hysteresis	Shuts down at 140°C junction temperature and re-enables only after cooling to 120°C, preventing thermal cycling instability.

Applications

Server Core Voltage Regulation

Storage Controller Power Supply

Use Scenario: Delivering stable 0.8–1.2V/10–14A to x86 CPU cores or ASICs in 1U/2U rack servers with strict thermal envelope constraints.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated FETs, handling full load transient response (<100 ns recovery) and dynamic voltage scaling (DVS) support via FB tracking.

Use Value: Eliminates discrete driver + MOSFET stage, reducing solution size by >40% and simplifying layout while maintaining <±1% output accuracy under 50 A/μs load steps.

Use Scenario: Powering NVMe SSD controllers and PCIe switch logic requiring tightly regulated 1.2V/3.3V rails with fast transient immunity in enterprise storage enclosures.

IC Role / Device Role / Timing Role: Point-of-load regulator with PGood signaling and sequencing (Seq pin) to coordinate with FPGA or host controller power-up sequence.

Use Value: Programmable soft-start prevents back-drive during hot-plug insertion; hiccup OCP avoids catastrophic failure during NAND flash write errors causing current surges.

Embedded Telecom Baseband Processing

Industrial Edge AI Accelerator Supply

Use Scenario: Supplying 0.95V/8–12A to multi-core DSPs or baseband processors in small-cell radio units operating at −40°C to +85°C ambient.

IC Role / Device Role / Timing Role: High-efficiency buck converter with wide input range (3.3V–12V) and extended temperature support, synchronized via RT pin to avoid beat frequencies with RF sections.

Use Value: 96% peak efficiency reduces heat sink requirements; thermal shutdown + hysteresis ensures graceful degradation during airflow blockage in sealed enclosures.

Use Scenario: Providing 1.8V/14A to heterogeneous AI inference accelerators (e.g., NPU+FPGA) in fanless industrial gateways with limited board space.

IC Role / Device Role / Timing Role: Compact, fully integrated buck regulator with programmable frequency (600 kHz) to balance EMI compliance and inductor size in dense mixed-signal layouts.

Use Value: 5mm × 6mm footprint fits within 12 mm² area budget; dual GND/PGND separation minimizes noise coupling into sensitive analog sensor interfaces.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2451DT-LF-Z	3A rated, 4.5–26V input, no integrated high-side FET, requires external bootstrap diode, 0.8V ref, fixed 500kHz FS	Limited to low-current auxiliary rails; lacks hiccup OCP, pre-bias start-up, and sequencing support	Select only for cost-sensitive, non-critical 3A rails where board space and feature set are secondary.
TPS544B20RQFT	15A rated, 4.5–18V input, 0.6V ref, PMBus interface, digital loop compensation, 2.5–1.6 MHz FS range	Supports telemetry, margining, and dynamic loop tuning but requires external FETs and complex configuration	Choose when digital monitoring, remote adjustment, or ultra-high-frequency operation (>1.6 MHz) is required despite higher BOM and design effort.

Compared with MP2451DT-LF-Z and TPS544B20RQFT, the IR3840AMTRPBF offers optimal balance of integration (integrated FETs + bootstrap diode), analog simplicity (no firmware/config), and robust protection-making it ideal for high-current, space-constrained analog PoL designs where reliability and ease of use outweigh digital flexibility.

Availability

IR3840AMTRPBF is available at Aetrix Electronics and suitable for server applications, storage applications, and embedded telecom systems requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for IR3840AMTRPBF 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 IR3840A SupIRBuck™ product line targets high-efficiency, high-current point-of-load regulation in datacenter and communications infrastructure, emphasizing integration, thermal resilience, and seamless system-level power sequencing.

FAQ

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

The IR3840AMTRPBF datasheet specifies stability with ≥220 μF total output capacitance using low-ESR ceramic or polymer capacitors. Layout must minimize loop inductance, especially between SW, PGND, and output caps. For 1.8V/14A operation, typical designs use four 47 μF/6.3V X5R ceramics in parallel with 1–2 mΩ ESR to ensure <1% output ripple under 50 A/μs transients.

Can the IR3840AMTRPBF operate with a 3.3V input supply?

Yes - the IR3840AMTRPBF supports input voltages from 1.5V to 16V, including 3.3V. At 3.3V_IN, maximum output is 0.9 × 3.3V = 2.97V. Efficiency remains >92% at 1.2V/10A due to low R_DS(on) (8.4 mΩ top, 5.7 mΩ bottom) and optimized gate drive. Ensure VCC is supplied externally or derived from VIN via LDO if boot voltage margin is insufficient.

How does the OCSet pin determine overcurrent threshold?

The OCSet pin sinks current proportional to inductor current. A resistor (R_OC) from OCSet to SW sets the trip point: I_TRIP ≈ 0.05 V / R_OC. For example, R_OC = 2.2 kΩ yields ~22.7 A trip at 500 kHz. The internal comparator compares OCSet voltage to a ramp-based threshold; actual current limit varies ±10% with temperature and switching frequency per datasheet Note4.

Is the IR3840AMTRPBF pin-compatible with lower-current variants like the IR3840MTRPBF (4A)?

No - although marketed as "pin compatible options for 4A, 8A and 12A devices", the IR3840AMTRPBF (14A) shares the same 15-pin Power QFN footprint and pinout with IR3840MTRPBF (4A), IR3840B (8A), and IR3840C (12A). However, internal FET R_DS(on) and thermal design differ significantly; substituting without verifying thermal margin and current capability may cause premature thermal shutdown or reduced lifetime.

IR3840AMTRPBF 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)

IR3840AMTRPBF FAQ

1.How can I place an order for IR3840AMTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3840AMTRPBF 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 IR3840AMTRPBF reliable?

The price and inventory of IR3840AMTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3840AMTRPBF is usually 5 days.

3.What payment methods are accepted for IR3840AMTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3840AMTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3840AMTRPBF?

IR3840AMTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3840AMTRPBF 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 IR3840AMTRPBF?

For technical support, including IR3840AMTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3840AMTRPBF requirements.

6.How does Aetrix verify that IR3840AMTRPBF is sourced from the original manufacturer or authorized distributors?

All IR3840AMTRPBF 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 IR3840AMTRPBF meets industry standards.

7.What is the process for return or replacement of IR3840AMTRPBF?

All IR3840AMTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3840AMTRPBF, 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 IR3840AMTRPBF part is unused and in its original packaging.

Return procedure for IR3840AMTRPBF:

1.Submit a request within 90 days.

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

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