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

Infineon Technologies IR3843WMTRPBF

Name: IR3843WMTRPBF
Brand: Infineon Technologies
SKU: IR3843WMTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3843WMTRPBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 15-PowerVQFN

Datasheet:: IR3843WMTRPBF.pdf

Description:: IC REG BUCK ADJ 2A PQFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,860

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Product details

Overview

IR3843WMTRPBF from Infineon Technologies is a highly integrated 2A 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 precise 0.7V–0.9×Vin output over 1.5V–16V input, supports programmable 225–1650kHz switching frequency, and features hiccup current limit, PGood, soft-start, and -40°C to 125°C junction operation - deployed in server point-of-load rails.

For engineers reviewing the IR3843WMTRPBF datasheet, IR3843WMTRPBF pinout, IR3843WMTRPBF application, or IR3843WMTRPBF equivalent, key selection criteria include its integrated power stage, ±1% 0.7V reference accuracy, programmable OCSET threshold, thermal shutdown at 140°C, and Seq pin for voltage-tracking sequencing in multi-rail systems.

Technical Context

The IR3843WMTRPBF implements a constant-on-time (COT) or voltage-mode control architecture with a high-bandwidth error amplifier (GBWP: 20–40MHz, slew rate: 7–20V/μs) and internal ramp generator (1.8V_p-p, 0.6V offset). Its dual ground structure separates signal (GND) and power (PGND) return paths to minimize noise coupling into feedback and control loops.

Switching frequency is set via an external resistor on the Rt pin (225–1650kHz range), while OCSet pin configures current limit by sensing SW node voltage drop across an external resistor. The Seq pin enables tracking-based startup with external resistor dividers, and the SS/SD pin provides both soft-start timing (via external capacitor) and active-low shutdown capability.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Continuous 2A load capability - supports stable regulation under full load without derating at T_j ≤ 125°C.
Input Voltage Range	1.5V to 16V - accommodates wide-range intermediate bus voltages including 3.3V, 5V, 12V, and 15V systems.
Output Voltage Range	0.7V to 0.9×V_in - enables sub-1V core supplies (e.g., 0.7V–0.85V for ASIC/FPGA I/O) with tight regulation.
Reference Voltage	0.7V ±1% (0°C–125°C) - ensures ±7mV absolute output tolerance for precision low-voltage rails.
Switching Frequency	225kHz to 1650kHz - selectable via Rt pin resistor; higher frequencies allow smaller inductors and output capacitors.
Junction Temperature	-40°C to 125°C - rated for industrial and telecom environments with thermal shutdown at 140°C and 20°C hysteresis.
Package	5mm × 6mm Power QFN, 0.9mm height, 15-pin - thermally enhanced layout with exposed PGND pad for efficient heat dissipation.

Pinout & Package

IR3843WMTRPBF uses a 15-pin 5mm × 6mm Power QFN package with exposed thermal pad (PGND-connected) and 0.9mm profile. Pin 1 is Seq; pin 15 is GND (signal ground); pins 10 and 15 are both GND but serve distinct roles (signal vs. power return).

Pin/Terminal	Circuit Role	Design Meaning
1 Seq	Sequencing reference input	Enables output voltage tracking during power-up using external resistor divider; connect to Vcc if unused.
2 FB	Inverting error amplifier input	Connects to output voltage divider; sets regulated output via 0.7V reference; sensitive to noise coupling.
3 COMP	Error amplifier output	Drives external RC compensation network between COMP and FB to stabilize control loop dynamics.
4,15 GND	Signal ground reference	Provides low-noise return for internal reference, E/A, and logic; must be isolated from PGND plane.
5 Rt	Oscillator frequency set	Resistor-to-GND sets switching frequency; 9.31kΩ → 1.5MHz, 28.7kΩ → 500kHz, 59kΩ → 250kHz.
6 SS/SD	Soft-start / shutdown control	Capacitor-to-GND sets ramp time; <0.3V forces immediate shutdown; open or pulled high enables operation.
7 OCSet	Over-current threshold set	Resistor from OCSet to SW sets current limit; value scales linearly with sensed switch-node voltage drop.
8 PGood	Power-good status output	Open-drain flag asserted when FB reaches 0.77–0.84V; requires external pull-up to Vcc.
9 VCC	Internal IC supply	Powers control circuitry and gate drivers; requires ≥1μF high-frequency ceramic cap to PGND.
10 PGND	Power ground return	Return path for high-side/low-side MOSFET drivers; must connect directly to PCB power ground plane.
11 SW	Switch node	Connects to inductor; carries high dv/dt switching waveform; critical for EMI and layout integrity.
12 VIN	Main input supply	Accepts 1.5–16V DC input; feeds high-side FET source and internal LDO for VCC generation.
13 Boot	High-side driver supply	0.1μF capacitor to SW generates floating bias for high-side gate drive; forward voltage ≤470mV @30mA.
14 Enable	Enable/disable control	UVLO thresholds: 1.14–1.36V start, 0.9–1.06V stop; leakage <15μA at 3.3V.

Key Features

Feature	Design Value
Integrated power stage	Co-packaged top/bottom MOSFETs (R_DS(on): 24.5/24.5 mΩ typ) eliminate external FET selection and layout complexity.
Programmable current limit	OCSet pin allows precise setting of over-current threshold independent of input/output conditions.
Enhanced pre-bias start-up	Allows safe turn-on into pre-charged output capacitors without reverse current or overshoot.
Thermal protection with hysteresis	Shuts down at 140°C junction temperature and restarts only after cooling by ≥20°C - prevents thermal cycling damage.
Tracking sequencing support	Seq pin enables synchronized ramp-up with other regulators using simple resistor-divider networks.

Applications

Server Core Voltage Regulation

Storage Controller Power Rail

Use Scenario: Providing tightly regulated 0.85V @ 2A to CPU I/O or memory interface circuits in 1U rack servers with constrained board space.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering low-noise, fast-transient core power with PGood signaling for system boot coordination.

Use Value: Integrated MOSFETs and 0.7V ±1% reference ensure ±8.5mV output accuracy; hiccup mode prevents latch-up during short-circuit events.

Use Scenario: Generating 1.2V @ 2A for NVMe SSD controller SoCs operating in high-temperature storage enclosures.

IC Role / Device Role / Timing Role: Point-of-load regulator with thermal shutdown (140°C) and extended -40°C to 125°C operation for reliability in sealed chassis.

Use Value: Programmable soft-start avoids inrush current into large SSD bulk capacitance; Seq pin aligns with 3.3V auxiliary rail sequencing.

Embedded Telecom Baseband Supply

Distributed PoL in Network Switches

Use Scenario: Delivering 0.9V @ 2A to FPGA-based baseband processing units in outdoor small-cell radio units.

IC Role / Device Role / Timing Role: High-efficiency buck converter with enhanced pre-bias start-up enabling hot-swap capability in field-replaceable modules.

Use Value: 5mm × 6mm footprint saves PCB area; integrated bootstrap diode eliminates discrete component and improves reliability.

Use Scenario: Local 1.8V supply for PHY transceivers in multi-port Ethernet switches with strict EMI requirements.

IC Role / Device Role / Timing Role: Synchronous buck regulator operating at 1.2MHz to shift switching noise above sensitive 100MHz–1GHz RF bands.

Use Value: Programmable frequency (up to 1.5MHz) and low EMI layout enable compliance with CISPR-32 Class B emissions limits.

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	Fixed 500kHz frequency, no OCSet programmability, lower 0.8V reference (±2%), 3A rating	Lacks tracking (Seq) and soft-start programmability; suited for cost-sensitive fixed-frequency designs	Select when simplicity and higher current margin outweigh need for sequencing or precision reference.
TPS54202DDCR	Adjustable frequency (200kHz–1.7MHz), 0.8V reference (±1%), no integrated bootstrap diode, 2A rating	Requires external bootstrap diode; lacks hiccup current limit and pre-bias start-up robustness	Choose when design flexibility (e.g., external compensation) is prioritized over integration and fault resilience.

Compared with MP2315DJ-LF-Z and TPS54202DDCR, IR3843WMTRPBF uniquely combines programmable OCSet, Seq-based tracking, integrated bootstrap diode, and ±1% 0.7V reference - making it optimal for space-constrained, multi-rail telecom and server PoL where sequencing integrity and transient immunity are critical.

Availability

IR3843WMTRPBF is available at Aetrix Electronics and suitable for server applications, storage applications, and embedded telecom systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for IR3843WMTRPBF 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 global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.

The SupIRBuck™ product line delivers fully integrated, high-efficiency DC/DC buck regulators targeting space-constrained point-of-load applications in datacenter, networking, and communications infrastructure.

FAQ

What is the minimum recommended output capacitance for stable operation?

The IR3843WMTRPBF datasheet specifies a minimum 22μF ceramic output capacitor with ≤5mΩ ESR for stability across the full 0.7V–0.9×V_in range. Lower ESR values improve transient response but require careful attention to zero placement in the compensation network tied to the COMP pin.

Does IR3843WMTRPBF support forced PWM or power-save mode?

No - the IR3843WMTRPBF operates exclusively in continuous conduction mode (CCM) with fixed-frequency voltage-mode control. It does not feature pulse-skipping, burst-mode, or forced-PWM selection; light-load efficiency is maintained via low quiescent current (500μA standby) and optimized MOSFET R_DS(on).

Can the Seq pin be used for power-down sequencing?

No - the Seq pin is unidirectional and designed solely for power-up tracking via resistor-divider networks. It does not monitor or control shutdown behavior; sequencing during power-down requires external logic or dedicated supervisor ICs coordinating the Enable pin.

Is the BOOT-to-SW voltage rating sufficient for 12V input operation?

Yes - the absolute maximum BOOT-to-SW rating is -0.3V to V_cc+0.3V (≤8.3V), and the typical bootstrap capacitor charges to ~5V above SW. At 12V input, SW swings from ~0V to ~12V, so BOOT reaches ~17V relative to GND - well within the 33V absolute max rating for the BOOT pin itself.

IR3843WMTRPBF 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:: 2A

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)

IR3843WMTRPBF FAQ

1.How can I place an order for IR3843WMTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3843WMTRPBF 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 IR3843WMTRPBF reliable?

The price and inventory of IR3843WMTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3843WMTRPBF is usually 5 days.

3.What payment methods are accepted for IR3843WMTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3843WMTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3843WMTRPBF?

IR3843WMTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3843WMTRPBF 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 IR3843WMTRPBF?

For technical support, including IR3843WMTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3843WMTRPBF requirements.

6.How does Aetrix verify that IR3843WMTRPBF is sourced from the original manufacturer or authorized distributors?

All IR3843WMTRPBF 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 IR3843WMTRPBF meets industry standards.

7.What is the process for return or replacement of IR3843WMTRPBF?

All IR3843WMTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3843WMTRPBF, 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 IR3843WMTRPBF part is unused and in its original packaging.

Return procedure for IR3843WMTRPBF:

1.Submit a request within 90 days.

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

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