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Infineon Technologies IR3841MTRPBF
- Part No.:
- IR3841MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 15-PowerVQFN
- Datasheet:
-
IR3841MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 8A PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,885
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Product details
Overview
IR3841MTRPBF from Infineon Technologies is a highly integrated 8A 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 precision regulation from 0.7V to 0.9×Vin over 1.5–16V input, supports up to 1.5MHz switching, and achieves >96% peak efficiency in server point-of-load applications.
For engineers reviewing the IR3841MTRPBF datasheet, IR3841MTRPBF pinout, IR3841MTRPBF application, or IR3841MTRPBF equivalent, key selection criteria include programmable hiccup OCP threshold (20.8–172μA), ±1% reference voltage accuracy at 0.7V, thermal shutdown at 140°C, and pre-bias start-up capability for reliable cold-start in telecom power systems.
Technical Context
The IR3841MTRPBF implements a current-mode synchronous buck architecture with an integrated error amplifier (GBWP: 20–40MHz, slew rate: 7–20V/μs) and programmable oscillator via external Rt resistor (225–1650kHz). Its dual ground structure-separate PGND and GND-minimizes noise coupling between power and signal paths.
Control features include soft-start via external capacitor on SS/SD pin, tracking-enabled sequencing via Seq pin, and open-drain PGood with 2.1–2.3V delay comparator threshold relative to SS ramp. Over-current protection uses OCSet pin with current-sense resistor to SW, enabling adjustable hiccup-mode trip points dependent on switching frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Continuous 8A load capability enables single-regulator support for FPGA core rails or ASIC I/O supplies. |
| Input Voltage Range | 1.5V to 16V allows direct operation from 3.3V, 5V, 12V, or intermediate bus architectures without pre-regulation. |
| Output Voltage Range | 0.7V to 0.9×Vin supports adaptive output scaling and dynamic voltage scaling (DVS) in processors. |
| Reference Voltage | Precision 0.7V ±1% (0°C to 125°C) ensures tight output regulation tolerance for sub-1V logic domains. |
| Switching Frequency | Programmable 225kHz to 1.5MHz permits optimization of size (inductor/capacitor) vs. efficiency vs. EMI. |
| Junction Temperature | -40°C to +125°C operating range meets industrial and telecom thermal requirements without derating. |
| Package | 5mm × 6mm Power QFN, 0.9mm height, 15-pin layout with exposed thermal pad for PCB heat dissipation. |
Pinout & Package
IR3841MTRPBF uses a 15-pin Power QFN package (5mm × 6mm, 0.9mm height) with exposed thermal pad. Pin numbering follows standard top-down view with Pin 1 at top-left corner.
| 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 | Inverting error amplifier input | Connects to output voltage divider to set regulated output; determines feedback loop stability and accuracy. |
| 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 path for internal reference and control circuitry; must be isolated from PGND. |
| 5 Rt | Oscillator frequency set | External resistor to GND programs switching frequency from 225kHz to 1.5MHz with ±10% accuracy. |
| 6 SS/SD | Soft-start/shutdown control | Capacitor to GND sets startup time; pulled below 0.3V to force immediate shutdown. |
| 7 OCSet | Over-current threshold set | Resistor from OCSet to SW sets hiccup-mode current limit; value scales with switching frequency. |
| 8 PGood | Power-good status output | Open-drain output signals valid regulation after soft-start; requires external pull-up to Vcc. |
| 9 VCC | Internal IC supply | Must be decoupled with ≥1μF high-frequency capacitor to PGND; operates 4.5–5.5V only. |
| 10 PGND | Power ground return | Dedicated return for high-side and low-side MOSFET drivers; connects directly to power plane under IC. |
| 11 SW | Switch node | Connects to inductor and bootstrap capacitor; carries high dv/dt switching waveform; critical for layout. |
| 12 VIN | Main input voltage | Accepts 1.5–16V DC input; feeds high-side MOSFET source and internal LDO for VCC generation. |
| 13 Boot | High-side gate driver supply | 0.1μF capacitor to SW provides floating bias for high-side MOSFET gate drive. |
| 14 Enable | Startup enable input | UVLO thresholds (1.2V start / 1.0V stop) allow precise turn-on control with external resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diode | Eliminates external diode, reducing BOM count and layout area while maintaining efficient high-side gate drive. |
| Enhanced pre-bias start-up | Allows safe start into pre-charged output capacitors without reverse current or latch-up, critical for hot-swap systems. |
| Programmable hiccup OCP | Configurable current-limit threshold and auto-retry behavior protects downstream loads during sustained overload or short-circuit. |
| High-bandwidth error amplifier | 20–40MHz GBWP and 7–20V/μs slew rate enable fast transient response (<10μs recovery) for CPU/GPU load steps. |
| Thermal protection with hysteresis | Shuts down at 140°C junction temperature and restarts only after cooling by 20°C, preventing thermal cycling damage. |
Applications
| Server VR12/VR13 Core Regulators | Storage Controller Power Supplies |
|---|---|
Use Scenario: Regulating 0.8–1.2V core voltage for dual-socket Xeon servers with dynamic load steps up to 8A/μs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated CPU core power with PGood sequencing and thermal monitoring. Use Value: >96% efficiency at 12V input reduces board-level heat density; programmable soft-start prevents inrush-induced rail collapse during boot. | Use Scenario: Powering NVMe SSD controllers and DRAM buffers in enterprise storage enclosures with strict thermal limits. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V intermediate bus to 1.8V I/O and 1.2V core rails with independent sequencing. Use Value: Seq pin enables synchronized ramp-up with host SoC; ±1% reference ensures compliance with JEDEC DDR4/5 voltage tolerances. |
| Embedded Telecom Line Cards | Distributed PoL in 5G Baseband Units |
Use Scenario: Providing isolated 3.3V and 1.2V rails on carrier-grade packet processing blades operating continuously at -40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-reliability buck converter with extended temperature rating and robust UVLO hysteresis for unattended field deployment. Use Value: -40°C to +125°C junction rating eliminates derating; Enable UVLO hysteresis (0.2V) prevents chatter during brown-out conditions. | Use Scenario: Delivering multiple low-voltage rails (0.85V, 1.0V, 1.8V) to FPGAs and ADCs in compact 5G radio units with constrained airflow. IC Role / Device Role / Timing Role: Compact, thermally optimized PoL regulator leveraging exposed thermal pad and low-Rds(on) MOSFETs for passive cooling. Use Value: 5mm × 6mm footprint saves space versus discrete solutions; integrated MOSFETs reduce conduction losses and thermal resistance by 30%. |
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 | 4A rated, 2–18V input, fixed 500kHz FS, no Seq or OCSet programming, smaller 3mm × 3mm QFN | Limited to lower-current applications; lacks tracking, hiccup OCP, and thermal shutdown hysteresis | Select when cost and size outweigh programmability and 8A capability. |
| TPS54821RHLR | 8A rated, 4.5–20V input, 350–1.5MHz FS, integrated MOSFETs, but no integrated bootstrap diode or Seq pin | Requires external bootstrap diode; no native power sequencing support; different pinout and compensation scheme | Choose when TI ecosystem compatibility or higher Vin range is prioritized over Infineon's integrated diode and Seq functionality. |
Compared with MP2451DT-LF-Z and TPS54821RHLR, the IR3841MTRPBF uniquely combines 8A capability, integrated bootstrap diode, Seq pin for multi-rail coordination, and hiccup-mode OCP-all in a thermally enhanced 5mm × 6mm QFN-making it optimal for high-density, thermally constrained telecom and server PoL designs.
Availability
IR3841MTRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom line cards, NVMe storage power supplies, and 5G baseband unit PoL applications requiring stable component supply across extended temperature and long production lifecycles.
Supply support for IR3841MTRPBF 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 GaN-based power conversion solutions.
The IR3841 belongs to Infineon's SupIRBuck™ family-designed specifically for high-efficiency, space-constrained point-of-load regulation in datacenter, networking, and communications infrastructure where integration, thermal performance, and programmability are critical.
FAQ
What is the minimum recommended output capacitance for stable operation at 8A load?
The IR3841MTRPBF requires ≥220μF total ceramic output capacitance with low ESR (≤2mΩ) for stable 8A operation at 1.2V output. Layout must minimize loop inductance by placing capacitors within 3mm of PGND and SW pins, and use ≥2x 1206 or 0805 case sizes to distribute ripple current and thermal stress.
How does the OCSet pin configure hiccup-mode over-current protection?
The OCSet pin sets hiccup-mode trip current by connecting a resistor between OCSet and SW. At 500kHz switching, a 10kΩ resistor yields ~48.8μA OCSET current, corresponding to ~25A peak inductor current. The device disables switching for 4096 cycles upon fault detection, then retries-reducing average power dissipation during sustained shorts.
Can the IR3841MTRPBF operate with a 3.3V input supply?
Yes-the IR3841MTRPBF supports input voltages as low as 1.5V, so 3.3V is fully within specification. However, VCC must be independently supplied at 4.5–5.5V (e.g., from auxiliary rail), since internal LDO cannot generate VCC from 3.3V VIN. Output voltage remains programmable down to 0.7V regardless of input.
Is the thermal pad electrically connected to any internal node?
No-the exposed thermal pad on the IR3841MTRPBF is internally connected only to PGND. It must be soldered to a dedicated PGND copper pour on the PCB with ≥6 thermal vias (0.3mm diameter) to inner ground planes to ensure effective heat transfer and meet θJA = 35°C/W specification.
IR3841MTRPBF 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:
- 8A
- 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)
IR3841MTRPBF FAQ
1.How can I place an order for IR3841MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3841MTRPBF 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 IR3841MTRPBF reliable?
The price and inventory of IR3841MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3841MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3841MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3841MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3841MTRPBF?
IR3841MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3841MTRPBF 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 IR3841MTRPBF?
For technical support, including IR3841MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3841MTRPBF requirements.
6.How does Aetrix verify that IR3841MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3841MTRPBF 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 IR3841MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3841MTRPBF?
All IR3841MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3841MTRPBF, 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 IR3841MTRPBF part is unused and in its original packaging.
Return procedure for IR3841MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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