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

Infineon Technologies IR3846MTR1PBF

Name: IR3846MTR1PBF
Brand: Infineon Technologies
SKU: IR3846MTR1PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IR3846MTR1PBF

Manufacturer:: Infineon Technologies

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 34-PowerVFQFN

Datasheet:: IR3846MTR1PBF.pdf

Description:: IC REG BUCK ADJ 35A 34PQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IR3846MTR1PBF from Infineon Technologies is a highly integrated synchronous buck DC/DC regulator with integrated high- and low-side MOSFETs, delivering up to 35A output current, 0.5% reference voltage accuracy, and programmable switching frequency from 300 kHz to 1.5 MHz. It operates across 1.5V–21V input and supports 0.6V–0.86×PVin output, targeting point-of-load power delivery in server and telecom systems.

For engineers reviewing the IR3846MTR1PBF datasheet, IR3846MTR1PBF pinout, IR3846MTR1PBF application, or IR3846MTR1PBF equivalent, key selection criteria include its thermally compensated current limit, remote differential sensing capability, programmable power good output with tracking, integrated bootstrap diode, and post-package trimmed dead-time for optimized efficiency in high-current, low-voltage rails.

Technical Context

The IR3846 implements a voltage-mode PWM controller with feed-forward compensation, enabling enhanced line regulation across wide input ranges. Its error amplifier features 100–120 dB DC gain, 20–40 MHz GBWP, and ±1.5% offset over temperature-critical for tight output voltage regulation at sub-1V levels.

It integrates a Smart LDO for bias generation, dedicated remote sense amplifier (3–9 MHz unity-gain bandwidth, ±2 mV offset), and digital soft-start with 180–220 kHz clock and 0.3–0.5 mV/µs ramp rate. Protection includes hiccup-mode overcurrent, thermal shutdown, pre-bias startup, and active OVP even during disable.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	±35 A continuous - supports high-density CPU/GPU core rail designs without external current sharing.
Reference Accuracy	±0.5% at 0°C–105°C - enables <±6 mV deviation on 1.2 V output, critical for modern processor tolerance.
Switching Frequency	300–1500 kHz programmable via Rt/Sync pin - allows optimization of size (inductor/capacitor) vs. efficiency trade-off.
Rds(on) Top/Bottom	3.1/1.27 mΩ typical - minimizes conduction loss at 35 A, contributing to >90% efficiency at 12 V_IN/1.2 V_OUT.
Remote Sense Accuracy	±2 mV offset over full temp range - ensures true load-point regulation despite PCB IR drop.
Junction Temp Range	–40°C to +125°C - validated for sustained operation in enclosed server chassis with limited airflow.
Package Thermal RθJA	14.3°C/W - enables 35 A operation with standard 2-layer PCB and modest copper area, no forced air required.

Pinout & Package

IR3846MTR1PBF uses a thermally enhanced 5 mm × 7 mm PQFN package with exposed thermal pad (PGND-connected) and 26-pin layout. Pin 1 is PVin; pins 2, 3, 22, 23, 26 are NC; pin 24 is SW; pin 21 is VCC/LDO_out; pin 12/25 are PGND; pin 13 is LGND.

Pin/Terminal	Circuit Role	Design Meaning
PVin (1)	Main power stage input	Connects to bulk input capacitor; feeds feed-forward path and high-side driver supply; requires local bypass to PGND.
Boot (4)	High-side gate driver supply	Supplies floating gate drive for top MOSFET; must be decoupled with 0.1 µF ceramic between Boot and SW.
Enable (5)	Global device enable/disable control	Logic-compatible input with UVLO thresholds (1.14–1.36 V start); supports sequencing and fault latch-off.
Rt/Sync (6)	Frequency programming / external sync input	Resistor-to-PGND sets f_SW; accepts external clock up to 1.65 MHz with smooth transition to avoid jitter.
OCset (7)	Current limit configuration	Three-level trip point selection: float = default, tie to VCC = higher limit, tie to PGND = lower limit.
Vsns (8)	OVP and Power Good sensing	Dedicated comparator input - remains active during Enable=low for system-level fault detection.
FB (9)	Error amplifier inverting input	Primary feedback node; accepts resistor divider or remote sense amplifier output for precise output regulation.
COMP (10)	Error amplifier output	Requires external RC network to FB for loop stability; drives internal PWM comparator.
RS+ / RS− (16/15)	Differential remote sense inputs	True Kelvin connection to load; rejects common-mode noise and PCB voltage drop for accurate load regulation.
Vref (17)	External reference access	Enables margining (0.4–1.2 V range) or tracking when tied to LGND; requires 100–180 pF bypass to LGND.
PGD (19)	Open-drain Power Good status	Asserts after soft-start and valid output; supports sequencing with external pull-up to VCC.
Vin (20)	LDO input supply	Must be connected when VCC is externally regulated; powers internal logic and drivers independently of PVin.
VCC/LDO_out (21)	Bias supply output	Provides 4.5–7.5 V for IC core and gate drivers; requires ≥4.7 µF ceramic bypass to PGND.
SW (24)	Power switch node	Connects to output inductor; high dv/dt node requiring short, low-inductance routing to minimize EMI.

Key Features

Feature	Design Value
Integrated MOSFET drivers + bootstrap diode	Eliminates need for external gate driver IC or discrete bootstrap circuit, reducing BOM count and layout complexity.
Thermally compensated current limit	Adjusts trip threshold with junction temperature to maintain consistent overcurrent protection across –40°C to +125°C.
Enhanced pre-bias start-up	Allows safe start into pre-charged output capacitors without reverse current or overshoot, essential for hot-swap systems.
Body braking during light-load transients	Actively sinks current during load steps to improve transient response and reduce output voltage undershoot.
Programmable power good with tracking	PGD assertion follows output voltage ramp with adjustable delay and threshold, enabling reliable multi-rail sequencing.

Applications

Server Core Voltage Regulation

Telecom Line Card Power

Use Scenario: Delivering stable 0.8–1.2 V @ 30–35 A to high-performance x86 or ARM processors in 1U/2U rack servers.

IC Role / Device Role / Timing Role: Primary point-of-load regulator with integrated power stage, performing voltage conversion, regulation, and protection.

Use Value: Achieves >92% peak efficiency at 12 V_IN/1.2 V_OUT, minimizing thermal load in dense server environments while supporting dynamic DVFS transitions.

Use Scenario: Powering FPGA, DSP, and SerDes on carrier-grade line cards with strict sequencing and reliability requirements.

IC Role / Device Role / Timing Role: Sequenced POL regulator with Vp and Vref pins enabling precise power-up/down order and voltage margining for field calibration.

Use Value: Remote differential sensing maintains ±5 mV regulation at the FPGA core despite 50–100 mΩ board trace resistance, ensuring signal integrity.

Network Switch ASIC Supply

Storage Controller Rail

Use Scenario: Generating 0.95 V @ 25 A for multi-core network processing units (NPUs) in enterprise switches with bursty traffic loads.

IC Role / Device Role / Timing Role: High-bandwidth buck regulator with body braking and fast transient response for handling microsecond-scale load steps.

Use Value: Sub-100 ns minimum pulse width and 200 ns fixed off-time support 1.5 MHz operation, enabling smaller magnetics and faster loop response under dynamic load.

Use Scenario: Supplying 1.1 V @ 20 A to NVMe SSD controllers in enterprise storage arrays where thermal headroom is constrained.

IC Role / Device Role / Timing Role: Thermally robust POL solution with θJA = 14.3°C/W and hiccup-mode OCP to sustain operation during sustained write bursts.

Use Value: Integrated Smart LDO reduces standby power loss by powering internal logic from VCC instead of PVin, improving light-load efficiency by ~15%.

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)	30 A max output, 4.5–18 V input, no integrated bootstrap diode, requires external bootstrap cap.	Lacks remote sense amplifier and Vp tracking; less suited for multi-rail sequencing-critical systems.	Prefer for cost-sensitive, lower-current (<30 A) applications where board space permits external bootstrap components.
TPS53689T (Texas Instruments)	40 A output, dual-phase capable, D-CAP3 control, no integrated bootstrap diode, larger 6 mm × 6 mm QFN.	Supports phase interleaving and PMBus interface; lacks Vref margining and dedicated Vsns OVP during disable.	Prefer when digital telemetry, multi-phase scaling, or tighter transient response via D-CAP3 are required over analog simplicity.

Compared with MP8765GQ-Z and TPS53689T, IR3846MTR1PBF uniquely combines 35 A capability with integrated bootstrap diode, true differential remote sensing, and active OVP during disable-making it optimal for compact, sequenced, high-reliability POL designs where analog control robustness and minimal external components are prioritized.

Availability

IR3846MTR1PBF is available at Aetrix Electronics and suitable for server motherboard power delivery, telecom line card POL, and enterprise storage controller rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IR3846MTR1PBF 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 SupIRBuck® product line delivers fully integrated, high-current DC/DC regulators targeting space-constrained, high-efficiency point-of-load applications in datacenter, networking, and telecom infrastructure.

FAQ

What is the minimum recommended output capacitance for stable 35 A operation?

The IR3846MTR1PBF datasheet specifies a minimum 330 µF total output capacitance using low-ESR polymer or MLCCs for 35 A operation at 600 kHz. Layout must place bulk caps within 5 mm of PGND and SW pins, and include ≥10×10 µF ceramic caps near the FB and Vsns pins to suppress high-frequency noise and ensure power-good accuracy.

How does the OCset pin configure current limit thresholds?

The OCset pin selects one of three current limit levels: floating sets nominal 35 A limit; connecting to VCC raises the threshold by ~20%; connecting to PGND lowers it by ~25%. This is implemented via internal resistor ladder and comparator, and the setting is latched at power-up-no runtime reconfiguration is supported.

Can IR3846MTR1PBF operate without an external Vcc supply?

Yes-IR3846MTR1PBF can self-bias via its Smart LDO using Vin (pin 20) supplied from PVin through a resistor or directly if PVin ≤ 7.5 V. However, when PVin exceeds 7.5 V, an external regulated VCC (4.5–7.5 V) is mandatory to prevent damage to internal logic and drivers.

Is remote sensing mandatory, or can FB be used in single-point configuration?

Remote sensing is optional. The FB pin supports direct connection to the output voltage divider for standard regulation. RS+/RS− are only required when board-level IR drop exceeds ±5 mV at full load; otherwise, single-point feedback meets specification with simpler layout and fewer components.

IR3846MTR1PBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 34-PowerVFQFN

Packaging:: Cut Tape (CT)

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):: 21V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 18.06V

Current - Output:: 35A

Frequency - Switching:: 300kHz ~ 1.5MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 34-PQFN (5x7)

IR3846MTR1PBF FAQ

1.How can I place an order for IR3846MTR1PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IR3846MTR1PBF 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 IR3846MTR1PBF reliable?

The price and inventory of IR3846MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3846MTR1PBF is usually 5 days.

3.What payment methods are accepted for IR3846MTR1PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3846MTR1PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IR3846MTR1PBF?

IR3846MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IR3846MTR1PBF 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 IR3846MTR1PBF?

For technical support, including IR3846MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3846MTR1PBF requirements.

6.How does Aetrix verify that IR3846MTR1PBF is sourced from the original manufacturer or authorized distributors?

All IR3846MTR1PBF 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 IR3846MTR1PBF meets industry standards.

7.What is the process for return or replacement of IR3846MTR1PBF?

All IR3846MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3846MTR1PBF, 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 IR3846MTR1PBF part is unused and in its original packaging.

Return procedure for IR3846MTR1PBF:

1.Submit a request within 90 days.

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

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