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

Infineon Technologies IR3842WMTRPBF

Name: IR3842WMTRPBF
Brand: Infineon Technologies
SKU: IR3842WMTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3842WMTRPBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3842WMTRPBF.pdf

Description:: IC REG BUCK ADJ 4A 15PQFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,557

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Product details

Overview

IR3842WMTRPBF from Infineon Technologies is a highly integrated 4A synchronous buck regulator with on-die high- and low-side MOSFETs, programmable switching frequency (250 kHz to 1.5 MHz), precision 0.7 V ±1% reference voltage, and integrated bootstrap diode. It delivers regulated output voltages from 0.7 V to 0.9×Vin across 1.5–16 V input, targeting point-of-load power in server and telecom systems.

For engineers reviewing the IR3842WMTRPBF datasheet, IR3842WMTRPBF pinout, IR3842WMTRPBF application, or IR3842WMTRPBF equivalent, key selection criteria include its 4A continuous load capability, hiccup-mode overcurrent protection, pre-bias start-up support, thermal shutdown at 140°C, and compatibility with distributed PoL architectures requiring tight output regulation and fast transient response.

Technical Context

The IR3842WMTRPBF implements a current-mode PWM control architecture with an internal error amplifier (GBWP = 20–40 MHz, slew rate = 7–20 V/μs) and programmable soft-start via external capacitor. Its high-bandwidth compensation node (Comp) enables stable loop design for low-ESR ceramic output capacitors.

It integrates dual N-channel MOSFETs (R_DS(on) = 24.5/14.3 mΩ typ.) and supports tracking via the Seq pin using resistor dividers. Protection includes under-voltage lockout on Vcc (4.15 V start, 3.85 V stop), Enable threshold (1.2 V start), thermal shutdown with 20°C hysteresis, and cycle-by-cycle current limiting set by OCSet resistor.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Continuous 4 A - supports mid-power CPU/GPU core rails without external current sense or external FETs.
Input Voltage Range	1.5 V to 16 V - accommodates 3.3 V, 5 V, 12 V intermediate bus architectures in servers and storage.
Output Voltage Range	0.7 V to 0.9×Vin - enables precise sub-1V core supply generation with adaptive margining.
Switching Frequency	250 kHz to 1.5 MHz - adjustable via Rt resistor; higher frequencies reduce inductor size but increase switching loss.
Reference Voltage	0.7 V ±1% (0°C–125°C) - ensures <±10 mV output accuracy over full junction temperature range.
Efficiency	>95% peak - achieved via integrated low-R_DS(on) MOSFETs and optimized gate drive, minimizing conduction and switching losses.
Junction Temp Range	−40°C to +125°C - rated for industrial and extended-temperature server board environments.
Package	5 mm × 6 mm Power QFN, 0.9 mm height - thermally enhanced exposed pad for PCB heat sinking in dense layouts.

Pinout & Package

IR3842WMTRPBF uses a 15-pin Power QFN package (5 mm × 6 mm, 0.9 mm height) with exposed thermal pad. Pin numbering follows standard counter-clockwise layout starting from top-left corner (Pin 1 = Seq).

Pin/Terminal	Circuit Role	Design Meaning
1 Seq	Sequencing input	Enables voltage-tracking during power-up via external resistor divider; connect to Vcc if unused.
2 FB	Error amplifier inverting input	Direct connection to output voltage divider; sets regulated output with 0.7 V reference.
3 Comp	Error amplifier output	External RC network here provides loop compensation for stability across load/transient conditions.
4,15 GND	Signal ground	Reference return for internal bias and control circuitry; separate from PGND to minimize noise coupling.
5 Rt	Frequency set	Resistor-to-GND sets switching frequency (e.g., 59 kΩ → 250 kHz; 9.31 kΩ → 1.5 MHz).
6 SS/SD	Soft-start/shutdown	Capacitor-to-GND controls ramp time; pulled low (<0.3 V) forces shutdown with hiccup recovery.
7 OCSet	Overcurrent threshold	Resistor from OCSet to SW sets current limit; value scales linearly with switching frequency.
8 PGood	Power-good open-drain output	Asserts high when FB reaches 0.77–0.849 V; requires external pull-up to Vcc.
9 VCC	Bias supply input	Powers internal logic and gate drivers; requires ≥1 μF high-frequency ceramic capacitor to PGND.
10 PGND	Power ground	Dedicated return path for high-current MOSFET drivers; must be connected to system power plane.
11 SW	Switch node	Connects to output inductor; carries high dv/dt switching waveform; critical for EMI layout.
12 VIN	Main input supply	Accepts 1.5–16 V; feeds high-side FET source and internal LDO for VCC generation.
13 Boot	High-side driver supply	0.1 μF capacitor to SW provides floating gate drive voltage for top FET; forward drop ≤470 mV.
14 Enable	Enable input with UVLO	Turns device on above 1.2 V (±0.16 V); leakage <15 μA; supports sequencing with resistor divider.

Key Features

Feature	Design Value
Integrated MOSFETs	Co-packaged 24.5 mΩ / 14.3 mΩ N-channel pair eliminates external FET selection and layout complexity.
Pre-bias start-up	Allows safe startup into pre-charged output rail-critical for hot-swap and multi-rail sequencing systems.
Hiccup current limit	Disables switching and retries after fixed delay upon overcurrent; prevents thermal runaway during sustained fault.
Programmable soft-start	Adjustable ramp time via external capacitor avoids inrush current and overshoot during power-on.
Thermal protection	Shuts down at 140°C junction temperature with 20°C hysteresis-enables reliable operation in constrained airflow.
Tracking capability	Seq pin accepts external resistor divider to match output ramp with another regulator's output-supports multi-phase tracking.

Applications

Server Core Voltage Regulation

Storage Controller Power

Use Scenario: Regulating 0.85 V @ 4 A for x86 CPU cores in 1U rack servers with strict thermal and space constraints.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated core voltage with fast transient response to dynamic load steps.

Use Value: Integrated MOSFETs and 5×6 mm QFN enable high-density VRM layout; >95% efficiency reduces heatsink requirements and improves system power density.

Use Scenario: Supplying 1.2 V @ 3.5 A to NVMe SSD controllers in enterprise storage enclosures operating at 60°C ambient.

IC Role / Device Role / Timing Role: Point-of-load DC/DC converter with hiccup OCP and thermal shutdown ensuring fault resilience during sustained write workloads.

Use Value: Pre-bias start-up allows safe hot-plug insertion; −40°C to +125°C rating guarantees reliability across storage temperature profiles.

Embedded Telecom Baseband Power

Industrial FPGA I/O Bank Supply

Use Scenario: Generating 1.8 V @ 4 A for LTE/5G baseband processors in fanless outdoor small cells.

IC Role / Device Role / Timing Role: High-efficiency buck regulator with programmable frequency (600 kHz) to avoid sensitive RF bands and meet EMI limits.

Use Value: Adjustable switching frequency and low-noise error amplifier (100 dB DC gain) suppress ripple-induced clock jitter in data converters.

Use Scenario: Providing 3.3 V @ 2.5 A to FPGA I/O banks in programmable logic controllers with wide input variation (5–12 V).

IC Role / Device Role / Timing Role: Input-flexible buck regulator supporting variable intermediate bus; Seq pin enables synchronized ramp with core rail.

Use Value: Wide 1.5–16 V input range accommodates unregulated industrial supplies; tracking ensures controlled power-up sequencing between I/O and core domains.

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	3A rated, 2.5–16 V input, fixed 500 kHz fsw, no Seq or tracking pin, smaller 3×3 mm QFN	Lacks sequencing and tracking; suitable only for single-rail, non-critical timing applications	Select when cost and footprint are prioritized over multi-rail coordination and thermal margin.
TPS544B20RTWR	4A, 4.5–18 V input, PMBus interface, digital loop compensation, 4×4 mm QFN	Supports telemetry and dynamic configuration via I²C; adds firmware overhead and BOM cost	Choose when remote monitoring, adaptive loop tuning, or voltage margining via command are required.

Compared with MP2315DJ-LF-Z and TPS544B20RTWR, the IR3842WMTRPBF offers analog-programmable flexibility (Rt, OCSet, SS) without digital interface complexity, while providing Seq-based tracking and robust pre-bias start-up-making it optimal for analog-centric, thermally demanding PoL designs where deterministic behavior is critical.

Availability

IR3842WMTRPBF is available at Aetrix Electronics and suitable for server applications, storage applications, and embedded telecom systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for IR3842WMTRPBF 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 MCUs, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The IR3842W SupIRBuck™ product line targets high-efficiency, space-constrained point-of-load regulation in datacenter and communications infrastructure, integrating power stages and control logic to simplify VRM design and improve thermal performance.

FAQ

What is the minimum recommended output capacitance for stable operation?

The IR3842WMTRPBF requires ≥22 μF total ceramic output capacitance with low ESR (≤5 mΩ) for stable regulation and transient response. Layout must place capacitors close to PGND/VIN pins, and use multiple parallel 10–22 μF X5R/X7R devices to maintain effective capacitance across temperature and DC bias.

Does IR3842WMTRPBF support forced PWM mode or only auto PFM/PWM?

The IR3842WMTRPBF operates exclusively in forced continuous conduction mode (FCCM) - it does not enter discontinuous or pulse-frequency modulation modes. This ensures constant switching frequency across all loads, simplifying EMI filtering and avoiding audible noise in sensitive applications.

How is thermal performance validated, and what is the θ_JA value?

Thermal performance is characterized per JEDEC JESD51-2 standards on 4-layer PCBs with 2 oz copper and 1 in² exposed pad copper area. The specified θ_JA is 35°C/W, and θ_JB is 2°C/W - measured with soldered thermal pad to inner ground plane. Actual board-level θ_JA depends on copper area, airflow, and layer stackup.

Can the PGood signal be used to enable downstream regulators directly?

Yes - the open-drain PGood output can sink ≥5 mA and is compatible with standard logic-level enable inputs. Connect a pull-up resistor (typically 10 kΩ to Vcc) and tie the drain to the EN pin of a downstream regulator; ensure downstream UVLO thresholds exceed PGood's 0.595 V lower threshold to prevent false disable.

IR3842WMTRPBF 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:: 4A

Frequency - Switching:: 225kHz ~ 1.65MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 15-PQFN (5x6)

IR3842WMTRPBF FAQ

1.How can I place an order for IR3842WMTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3842WMTRPBF 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 IR3842WMTRPBF reliable?

The price and inventory of IR3842WMTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3842WMTRPBF is usually 5 days.

3.What payment methods are accepted for IR3842WMTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3842WMTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3842WMTRPBF?

IR3842WMTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3842WMTRPBF 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 IR3842WMTRPBF?

For technical support, including IR3842WMTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3842WMTRPBF requirements.

6.How does Aetrix verify that IR3842WMTRPBF is sourced from the original manufacturer or authorized distributors?

All IR3842WMTRPBF 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 IR3842WMTRPBF meets industry standards.

7.What is the process for return or replacement of IR3842WMTRPBF?

All IR3842WMTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3842WMTRPBF, 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 IR3842WMTRPBF part is unused and in its original packaging.

Return procedure for IR3842WMTRPBF:

1.Submit a request within 90 days.

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

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