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Infineon Technologies IR3891MTRPBF
- Part No.:
- IR3891MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 31-PowerVFQFN
- Datasheet:
-
IR3891MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A DL PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,450
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Product details
Overview
IR3891MTRPBF from Infineon Technologies (formerly International Rectifier) is a dual-output, 4A/phase synchronous buck regulator with integrated high- and low-side MOSFETs, drivers, bootstrap diodes, and PWM controller in a single 5mm × 6mm PQFN package. It operates from 1V–21V input, delivers 0.5V–0.86×PVin outputs, supports up to 1.5MHz switching, and features precision 0.5V ±1% reference, thermal shutdown, OVP, and hiccup-mode overcurrent protection - used in server point-of-load and telecom voltage regulation.
For engineers reviewing the IR3891MTRPBF datasheet, IR3891MTRPBF pinout, IR3891MTRPBF application, or IR3891MTRPBF equivalent, key selection criteria include interleaved-phase current capability, programmable frequency via RT/Sync pin, sequencing support via Seq pin, and dual-channel PGood monitoring for system power integrity validation.
Technical Context
The IR3891 implements a dual-channel, interleaved synchronous buck architecture with independent error amplifiers, internal digital soft-start, and feed-forward line regulation. Each channel integrates 27.5mΩ high-side and 19.5mΩ low-side MOSFETs, supporting monotonic startup and pre-bias operation.
It uses a fixed-off-time (200–250ns) oscillator with external resistor or clock synchronization on the Rt/Sync pin, enabling precise frequency control from 300kHz to 1.5MHz. Protection includes thermally compensated current limit, open-loop fault detection, and 140°C thermal shutdown with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1V–21V (supports wide bus rails including 12V server inputs) |
| Output Current per Phase | 4A continuous (enables dual 4A PoL rails without external FETs) |
| Switching Frequency | 300kHz–1.5MHz (adjustable via RT resistor or external sync clock) |
| Reference Voltage | 0.5V ±1% (enables accurate sub-1V CPU/GPU core rail regulation) |
| Thermal Shutdown Threshold | 140°C with 20°C hysteresis (prevents thermal runaway during sustained overload) |
| Package | 5mm × 6mm PQFN (low-profile, high-power-density layout with 6 PGnd pins) |
| Protection Features | OVP (120% Vref), OFLP (70% Vref), hiccup-mode OC, UVLO on EN/VCC |
Pinout & Package
IR3891MTRPBF is housed in a thermally enhanced 31-pin Power QFN (PQFN) package measuring 5mm × 6mm, with exposed thermal pad and six dedicated PGnd pins for low-inductance power return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vin | LDO input bias supply | Accepts 5V–21V to power internal logic; short to VCC if externally biased |
| VCC/LDO_out | Internal LDO output | 5.0–5.6V regulated supply for gate drivers and control circuitry |
| Rt/Sync | Frequency programming & sync input | Resistor-to-GND sets free-run freq; external clock enables phase alignment |
| Seq | Channel-2 sequencing control | Enables controlled power-up order between dual outputs (only on Ch2) |
| FB1/FB2 | Output voltage feedback inputs | Inverting inputs to error amps; set Vout via resistor dividers (0.5V reference) |
| PGood1/PGood2 | Open-drain power-good indicators | Assert high when respective output is within ±5% of target (80–90% Vref window) |
| SW1/SW2 | Power switch nodes | Connect to output inductors; rated for 25V DC / -4V AC transient |
| Boot1/Boot2 | High-side gate driver supplies | Require 100nF bootstrap capacitors to SW pins for N-channel high-side drive |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power stage | Eliminates 4 external MOSFETs and 2 gate drivers per channel - reduces BOM count and layout area |
| Interleaved dual-phase operation | Halves input ripple current vs. single-phase, reducing required bulk capacitance by ~50% |
| Dual independent PGood outputs | Enables per-rail power sequencing and fault isolation in multi-voltage systems |
| Programmable soft-start ramp rate | 0.14–0.22 mV/µs (prevents inrush current and ensures monotonic startup into pre-biased loads) |
| Thermally compensated current limit | 6.0A typical per phase at 25°C, derated linearly above 25°C - improves reliability under thermal stress |
Applications
| Server VR12/VR13 Core Rails | Telecom Line Card PoL |
|---|---|
Use Scenario: Regulating dual-core CPU/GPU supply rails (e.g., 1.8V + 1.2V) from 12V intermediate bus in rack-mounted servers. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller delivering tightly regulated, sequenced, and monitored core voltages. Use Value: Integrated MOSFETs and interleaving reduce board space and input capacitor count while maintaining <±1% load regulation across 0–4A. | Use Scenario: Providing isolated 3.3V and 1.2V rails for FPGA, SerDes, and PHY ICs on telecom line cards with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency, synchronized dual-output regulator enabling spread-spectrum-compatible 600kHz operation. Use Value: RT/Sync pin allows clock synchronization to system master clock, suppressing beat frequencies and easing EMI compliance. |
| Storage Controller Power | Embedded Networking Switch ASIC |
Use Scenario: Powering NVMe SSD controllers and DRAM buffers requiring fast transient response and rail sequencing. IC Role / Device Role / Timing Role: Dual-output regulator with independent soft-start and Seq pin enabling staggered power-up of I/O and core domains. Use Value: Monotonic start-up and pre-bias startup prevent latch-up on powered-down downstream logic during hot-insertion events. | Use Scenario: Delivering 1.0V core and 1.8V I/O rails to multi-port Ethernet switch ASICs in industrial switches. IC Role / Device Role / Timing Role: Highly integrated buck regulator operating from 5V–12V input with robust OVP/OFLP protection. Use Value: Open-feedback-line protection and 125°C max junction temperature rating ensure reliable operation in fanless, sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8765GQ-Z (Monolithic Power) | Single 4A output; no dual-channel integration; requires external FETs for second rail | Lacks native dual-rail sequencing and independent PGood signals | Choose when only one high-current rail is needed and cost-per-amp is prioritized over integration |
| TPS546D24RQFT (Texas Instruments) | 6A per channel, PMBus interface, higher pin count (40-QFN), supports telemetry and dynamic voltage scaling | Requires firmware configuration and adds system-level communication overhead | Choose when digital control, margining, and real-time telemetry are required for advanced power management |
Compared with MP8765GQ-Z and TPS546D24RQFT, IR3891MTRPBF provides optimal balance of dual-rail integration, analog simplicity, and thermal performance in space-constrained 5mm × 6mm footprint - ideal for analog-controlled, high-density PoL designs without digital infrastructure.
Availability
IR3891MTRPBF is available at Aetrix Electronics and suitable for server VR12/VR13 core rails, telecom line card PoL, and embedded networking switch ASIC power delivery requiring stable component supply and long-term lifecycle support.
Supply support for IR3891MTRPBF 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 global semiconductor leader specializing in power management, automotive, and industrial control solutions, with deep expertise in high-efficiency power conversion ICs.
The SupIRBuck® product line delivers fully integrated, high-current synchronous buck regulators targeting space-constrained, high-performance point-of-load applications in computing, telecom, and storage infrastructure.
FAQ
What is the maximum allowable input voltage on the PVin pins?
The absolute maximum rating for PVin is 25V DC, but the recommended operating range is 1.0V to 21V. Exceeding 21V may trigger overvoltage protection via the Vsns pins and is not supported for continuous operation per datasheet specifications.
Can IR3891MTRPBF operate with an external 5V bias instead of deriving VCC from Vin?
Yes - when using an external 5V supply, connect it directly to the VCC/LDO_out pin and short the Vin pin to VCC. This bypasses the internal LDO and allows operation with input buses below 5V, provided PVin remains within 1V–21V.
How does the Seq pin function, and which channel does it control?
The Seq pin connects only to Channel 2's error amplifier and enables output voltage sequencing: pulling Seq low delays Channel 2 startup until Channel 1 reaches regulation. It is unconnected in non-sequencing applications and has no effect on Channel 1 behavior.
What thermal performance can be expected in a standard 4-layer PCB layout?
With a standard 4-layer board (2oz copper, thermal vias under the exposed pad), θJA is 24.7°C/W. At 4A/phase and 600kHz, typical power loss is ~1.38W, resulting in ~34°C junction-to-ambient rise - well within the -40°C to 125°C operating range.
IR3891MTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 31-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 21V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 18.06V
- Current - Output:
- 4A
- Frequency - Switching:
- 300kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PQFN (5x6)
IR3891MTRPBF FAQ
1.How can I place an order for IR3891MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3891MTRPBF 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 IR3891MTRPBF reliable?
The price and inventory of IR3891MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3891MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3891MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3891MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3891MTRPBF?
IR3891MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3891MTRPBF 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 IR3891MTRPBF?
For technical support, including IR3891MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3891MTRPBF requirements.
6.How does Aetrix verify that IR3891MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3891MTRPBF 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 IR3891MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3891MTRPBF?
All IR3891MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3891MTRPBF, 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 IR3891MTRPBF part is unused and in its original packaging.
Return procedure for IR3891MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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