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Infineon Technologies IR3847MTRPBF
- Part No.:
- IR3847MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 33-PowerVFQFN
- Datasheet:
-
IR3847MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 25A PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,261
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Product details
Overview
IR3847MTRPBF from Infineon Technologies is a highly integrated synchronous buck DC-DC regulator with integrated high- and low-side MOSFETs, delivering up to 25A output current, 0.6V–0.86×PVin adjustable output voltage, and programmable switching frequency from 300 kHz to 1.5 MHz. It operates from 1.5V–21V input (with external Vcc) and features true differential remote sensing, digital soft-start, and hiccup-mode overcurrent protection - deployed in server point-of-load and telecom power systems.
For engineers reviewing the IR3847MTRPBF datasheet, IR3847MTRPBF pinout, IR3847MTRPBF application, or IR3847MTRPBF equivalent, key selection criteria include its 5mm × 6mm PQFN package, ±0.5% reference accuracy, feed-forward line regulation, thermal shutdown, and dedicated Vp/Vref pins for sequencing and margining in high-density power delivery designs.
Technical Context
The IR3847 implements a voltage-mode PWM controller with feed-forward compensation, enabling enhanced line regulation across wide input ranges. Its internal Smart LDO supplies bias to control circuitry while improving light-load efficiency, and the digitally controlled soft-start ensures monotonic output ramp-up without pre-bias issues.
Current limiting is thermally compensated and selectable via OCset pin (floating/VCC/PGND), supporting three trip thresholds. The block diagram confirms independent sensing paths: Vsns for OVP/PGOOD, RS+/RS− for remote sense amplifier, and Vref for external margining - all operating even when Enable is deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 25 A continuous - supports high-current CPU/GPU core rails in servers and networking ASICs. |
| Input Voltage Range | 1.5 V to 21 V (with external Vcc) - enables direct connection to 3.3V, 5V, 12V, or 19V intermediate bus architectures. |
| Reference Accuracy | ±0.5 % at 0°C–105°C - ensures tight output voltage tolerance critical for sub-1V logic supply compliance. |
| Switching Frequency | 300 kHz to 1.5 MHz - allows optimization of size (higher fsw → smaller inductor/capacitor) vs. efficiency (lower fsw → lower switching loss). |
| Rds(on) Top/Bottom | 5.2 mΩ / 2.3 mΩ - minimizes conduction loss at 25A, enabling >90% efficiency at 12VIN/1.2VOUT. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and telecom environments with sustained high-power operation. |
| Package | 5 mm × 6 mm PQFN - thermally enhanced layout with multiple PGND pads and exposed thermal pad for θJA = 14.7°C/W. |
Pinout & Package
IR3847MTRPBF uses a 33-pin Power QFN (PQFN) package, 5 mm × 6 mm, with exposed thermal pad. Pin 1 (PVin) is top-left in standard top-view orientation; SW pins (20,21,22,23,24,25,32) are distributed across bottom edge for low-inductance inductor connection; PGND pins (10,26,27,29) provide multi-point ground return for high di/dt paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVin (1) | Main power input to high-side FET | Bypass capacitors must be placed adjacent to this pin and PGND to minimize loop inductance and feed-forward noise coupling. |
| Boot (2) | High-side gate driver supply | Connected to SW node through external bootstrap capacitor; regulates gate drive voltage for top FET during high-duty-cycle operation. |
| Enable (3) | Global IC on/off control | UVLO threshold 1.14–1.36 V rising; supports sequencing with external RC delay or system supervisor signals. |
| Rt/Sync (4) | Frequency set/synchronization input | Resistor-to-LGND sets fSW; accepts external clock up to 1.65 MHz with smooth transition to avoid jitter injection. |
| OCset (5) | Overcurrent trip level select | Three settings: floating (25A), tied to VCC (20A), tied to PGND (15A) - enables design flexibility without external components. |
| Vsns (6) | OVP and PGOOD sense input | Monitors output voltage independently of FB loop; maintains PGOOD assertion even when Enable is low - critical for system safety monitoring. |
| FB (7) | Error amplifier inverting input | Connects to output divider; 0.6 V reference enables precise regulation down to 0.6 V with <±0.5% accuracy over temperature. |
| Comp (8) | Error amplifier output | External RC network from Comp to FB sets loop compensation - supports Type II/III compensation for stability across load/transient conditions. |
| RS+ / RS− (13/12) | Differential remote sense inputs | True Kelvin sensing at load; rejects PCB trace IR drop - essential for <±10 mV regulation accuracy at 25A. |
| Vref (14) | External reference for margining | Accepts 0.4–1.2 V external voltage; used to shift output ±5% for production testing or dynamic voltage scaling. |
| Vp (15) | Tracking/sequencing control | Used as master reference for multi-rail sequencing; open-circuit when unused - avoids unintended interaction with other rails. |
| PGD (16) | Open-drain Power Good output | Asserts after soft-start completes and output is within ±10% of target; requires external pull-up to VCC/LDO_out. |
| Vin (17) | LDO input supply | Must be ≥5 V; powers internal analog/digital blocks - decoupled with ≥4.7 µF ceramic cap to PGND. |
| VCC/LDO_out (18) | Internal LDO output | 6.8 V ±0.5 V, 30 mA capable - supplies gate drivers and logic; reduces need for external bias rail. |
| SW (20,21,22,23,24,25,32) | Power switch node | Seven parallel SW pins reduce current density and parasitic inductance; connects directly to output inductor and bootstrap capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFET drivers + bootstrap diode | Eliminates external gate driver IC and discrete bootstrap diode - reduces BOM count and layout complexity in space-constrained PoL designs. |
| Thermally compensated current limit | Adjusts trip point with junction temperature to maintain consistent overcurrent protection across –40°C to +125°C ambient. |
| Enhanced pre-bias start-up | Allows safe startup into pre-charged output capacitors without reverse current flow - prevents damage to downstream loads in hot-swap applications. |
| Body braking during transients | Activates low-side FET during light-load discontinuous conduction to damp output voltage overshoot - improves transient response by >30% vs. standard buck controllers. |
| Dedicated Vsns path for PGOOD/OVP | Independent sensing ensures reliable power-good signaling and overvoltage protection even during enable/disable transitions or fault recovery. |
Applications
| Server Core Voltage Regulation | Telecom Line Card Power |
|---|---|
Use Scenario: Regulating 0.8–1.2 V core supply for dual-socket Xeon or AMD EPYC processors in 1U/2U rack servers. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering up to 25 A with <±10 mV load regulation using remote sensing. Use Value: Integrated MOSFETs and 5×6 mm footprint reduce board area by 40% vs. discrete controller + DrMOS solutions while maintaining >92% peak efficiency at 12 VIN. | Use Scenario: Powering FPGA, DSP, and SerDes on carrier-grade line cards with strict sequencing and margining requirements. IC Role / Device Role / Timing Role: Sequenced secondary rail generator using Vp tracking and Vref margining for production test and dynamic voltage scaling. Use Value: Dedicated Vp and Vref pins enable precise rail coordination and ±5% output adjustment without external DACs or resistors - accelerating validation and field calibration. |
| Network Switch ASIC Supply | Storage Controller Board Power |
Use Scenario: Delivering clean, low-noise 1.0 V supply to 28 nm/16 nm switch ASICs with fast load transients up to 15 A/µs. IC Role / Device Role / Timing Role: High-bandwidth synchronous buck regulator with body braking and feed-forward compensation to suppress transient undershoot/overshoot. Use Value: 20 V/µs error amplifier slew rate and 30 MHz GBWP ensure stable loop response under 10 A step load - reducing output capacitance requirement by 30%. | Use Scenario: Powering NVMe SSD controller and DRAM buffer on enterprise storage backplanes with thermal constraints. IC Role / Device Role / Timing Role: Thermally robust PoL converter with θJA = 14.7°C/W and thermal shutdown at 150°C junction. Use Value: Exposed thermal pad and seven SW pins enable efficient heat spreading - sustaining 25 A continuous output at 70°C ambient without forced air cooling. |
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) | 20 A rated, 2.5 V–18 V input, no integrated bootstrap diode, requires external high-side driver. | Lacks remote sense amplifier and Vp tracking; limited to single-rail, non-sequenced applications. | Preferred where cost sensitivity outweighs sequencing/margining needs and board space allows discrete driver layout. |
| TPS53689T (Texas Instruments) | 30 A rated, supports D-CAP3 control, includes PMBus interface, but larger 6 mm × 6 mm QFN package. | Offers digital telemetry and adaptive voltage positioning - suited for closed-loop system management, not basic analog regulation. | Select when telemetry, adaptive margining, or multi-phase synchronization is required beyond IR3847's analog capabilities. |
Compared with MP8765GQ-Z and TPS53689T, IR3847MTRPBF delivers optimal analog simplicity: integrated bootstrap diode, true differential remote sensing, and Vp/Vref pins for hardware-based sequencing and margining - making it ideal for cost-sensitive, high-reliability, analog-controlled PoL systems without digital infrastructure.
Availability
IR3847MTRPBF is available at Aetrix Electronics and suitable for server core voltage regulation, telecom line card power, and network switch ASIC supply requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for IR3847MTRPBF 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, 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-current DC-DC regulators targeting space-constrained, high-efficiency point-of-load applications in datacenter, telecom, and enterprise storage systems.
FAQ
What is the minimum output voltage supported by IR3847MTRPBF?
The IR3847MTRPBF supports an output voltage range from 0.6 V to 0.86 × PVin, with the 0.6 V lower bound set by its internal 0.6 V reference voltage. This enables direct regulation of modern sub-1V processor cores without external resistor dividers that degrade accuracy.
How does the OCset pin configure overcurrent protection?
The OCset pin selects one of three current-limit thresholds: floating (25 A), tied to VCC (20 A), or tied to PGND (15 A). This configuration is latched at power-up and remains active throughout operation, providing hardware-selectable protection without firmware or external logic.
Can IR3847MTRPBF operate without an external Vcc supply?
Yes - IR3847MTRPBF can self-bias via its internal Smart LDO when Vin is ≥5 V. In this mode, VCC/LDO_out (pin 18) supplies internal circuitry and gate drivers. An external Vcc is only required when Vin < 5 V or when higher LDO output current (>30 mA) is needed.
Does the IR3847MTRPBF support remote sensing with Kelvin connections?
Yes - the RS+ and RS− pins implement a true differential remote sense amplifier with 110 dB DC gain and ±2 mV offset over temperature. Connecting RS+ to the load's VOUT and RS− to the load's GND enables accurate regulation independent of PCB trace resistance, critical for 25 A applications.
IR3847MTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 33-PowerVFQFN
- 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):
- 21V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 18.06V
- Current - Output:
- 25A
- 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)
IR3847MTRPBF FAQ
1.How can I place an order for IR3847MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3847MTRPBF 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 IR3847MTRPBF reliable?
The price and inventory of IR3847MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3847MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3847MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3847MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3847MTRPBF?
IR3847MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3847MTRPBF 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 IR3847MTRPBF?
For technical support, including IR3847MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3847MTRPBF requirements.
6.How does Aetrix verify that IR3847MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3847MTRPBF 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 IR3847MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3847MTRPBF?
All IR3847MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3847MTRPBF, 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 IR3847MTRPBF part is unused and in its original packaging.
Return procedure for IR3847MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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