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Infineon Technologies IR3847MTR1PBF
- Part No.:
- IR3847MTR1PBF
- Manufacturer:
- Infineon Technologies
- Package:
- 29-PowerVQFN
- Datasheet:
-
IR3847MTR1PBF.pdf
- Description:
- IC REG BUCK ADJ 25A PQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
IR3847MTR1PBF from Infineon Technologies is a highly integrated synchronous buck DC/DC regulator with integrated high- and low-side MOSFETs, supporting 1.5V–21V input and 0.6V–0.86×PVin output at up to 25A. It features 0.5% reference accuracy, programmable 300–1500kHz switching frequency, remote differential voltage sensing, and dedicated power-good with overvoltage protection active even when disabled. Used in server point-of-load rails.
For engineers reviewing the IR3847MTR1PBF datasheet, IR3847MTR1PBF pinout, IR3847MTR1PBF application, or IR3847MTR1PBF equivalent, key selection criteria include its feed-forward-enhanced line/load regulation, thermally compensated hiccup-mode overcurrent protection, smart LDO biasing, pre-bias startup capability, and PQFN 5mm×6mm thermal performance (θJA = 14.7°C/W).
Technical Context
The IR3847 implements a voltage-mode PWM controller with digital soft-start, feed-forward compensation for dynamic line rejection, and a dedicated remote sense amplifier with true differential inputs (RS+, RS−) and 3–9MHz unity-gain bandwidth. Its error amplifier delivers 20–40MHz GBWP and 100–120dB DC gain.
Protection architecture includes independent overvoltage detection on Vsns (active during enable-low), thermal shutdown with 125°C trip, programmable current limit via OCset (three discrete thresholds), and body braking for improved load transient response. The Smart LDO supplies VCC/LDO_out from Vin, enabling operation down to 5V input without external bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 25A continuous - supports high-current CPU/GPU core rails without external MOSFETs |
| Input Voltage Range | 1.5V–21V with external Vcc; 5V–21V self-biased - enables direct 12V bus or intermediate 5V rail use |
| Output Voltage Accuracy | ±0.5% at 0°C–105°C - ensures tight regulation for sub-1V logic supplies |
| Switching Frequency | 300–1500kHz programmable via Rt/SYNC - allows optimization of size vs. efficiency (e.g., 600kHz @ 12V→1.2V/25A yields 3.62W loss) |
| MOSFET Rds(on) | Top: 4–5.2mΩ; Bottom: 1.8–2.3mΩ @ 25°C - minimizes conduction loss in high-current operation |
| Thermal Resistance | θJA = 14.7°C/W - enables 25A operation with standard PCB copper area and no forced airflow |
| Remote Sense Bandwidth | 3–9MHz - supports fast transient correction across long PCB traces without instability |
Pinout & Package
IR3847MTR1PBF uses a 33-pin PQFN package (5mm × 6mm, 0.5mm pitch) with exposed thermal pad (PGND-connected) for low-impedance heat dissipation. Pin 1 (PVin) and pins 10/26/27/29 (PGND) form the primary power loop; SW pins (20,21,22,23,24,25,32) are paralleled for low-inductance inductor connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVin (1) | Main power input to high-side FET | Bypass capacitor must be placed adjacent to PGND pins to minimize switching loop inductance |
| Boot (2) | High-side gate driver supply | Internal bootstrap diode eliminates external component; requires small ceramic cap to SW |
| Enable (3) | Global IC activation control | UVLO thresholds (1.14–1.36V start) support precise sequencing; leakage <1µA |
| Rt/SYNC (4) | Frequency set or external clock input | Resistor sets 300–1500kHz; accepts 270–1650kHz sync signal with 100–200ns pulse width |
| OCset (5) | Current limit configuration | Three states: float (25A), tie to VCC (20A), tie to PGND (15A) - enables design margining |
| Vsns (6) | OVP and Power-Good sense node | Dedicated comparator remains active during disable - ensures system-level fault coverage |
| FB (7) | Error amplifier inverting input | Connects to output or remote sense amp; sets VOUT via resistor divider referenced to 0.6V Vref |
| Comp (8) | Error amplifier output | External RC network provides type-II/III compensation; 7–20V/µs slew rate supports wide bandwidth |
| RS+ / RS− (13/12) | Differential remote sense inputs | True Kelvin sensing at load; 45–85kΩ input impedance avoids trace resistance error |
| Vref (14) | External reference access | Enables margining (0.4–1.2V range) or tracking (tie to LGND); 100–180pF decoupling required |
| Vp (15) | Voltage tracking/sequencing input | Accepts external ramp for coordinated startup/shutdown; open if unused (no capacitor) |
| PGD (16) | Open-drain Power-Good output | Asserts after soft-start and OVP check; pull-up to VCC required; active-low fault indication |
| Vin (17) | LDO input supply | Must be ≥5V when VCC is externally regulated; enables Smart LDO operation down to 5V bus |
| VCC/LDO_out (18) | Internal LDO output | 6.3–7.1V @ 30mA; powers control logic and gate drivers; requires ≥4.7µF bypass to PGND |
| SW (20,21,22,23,24,25,32) | Power switch node | Seven paralleled pins reduce current density and parasitic inductance for 25A switching |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFET drivers + bootstrap diode | Eliminates 4 external components; reduces layout complexity and footprint vs. controller-only solutions |
| Enhanced pre-bias startup | Allows safe turn-on into pre-charged output capacitors without reverse current or latch-up |
| Body braking during load transients | Actively sinks current during step-down events to suppress undershoot and improve recovery time |
| Thermally compensated hiccup-mode OCP | Reduces average power during sustained overload while preventing thermal runaway |
| Post-package trimmed dead-time | Minimizes shoot-through risk across temperature and process variation without external tuning |
| Dedicated Vsns path with active-low PGD | Provides independent OVP monitoring that persists through enable-disable cycles for fail-safe systems |
Applications
| Server Core Voltage Regulation | Telecom Line Card PoL |
|---|---|
|
Use Scenario: Delivering 0.8–1.2V at up to 25A to multi-core Xeon or AMD EPYC processors in 1U rack servers. IC Role / Device Role / Timing Role: Primary point-of-load regulator with remote sensing across motherboard VRM traces and integrated power-good signaling to BMC. Use Value: 0.5% VREF accuracy and feed-forward regulation maintain ±10mV tolerance under 10A/µs load steps; thermal resistance enables passive cooling. |
Use Scenario: Generating 3.3V or 1.8V for FPGA, DSP, and SerDes on carrier-grade telecom line cards with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous buck converter with programmable 600kHz switching and external synchronization to avoid slot harmonics. Use Value: 1500kHz max frequency allows compact 0.22µH inductors; hiccup OCP prevents damage during hot-swap insertion faults. |
| Storage Controller Power | Industrial Embedded Computing |
|
Use Scenario: Supplying stable 1.0V/20A to NVMe SSD controllers and DRAM buffers in enterprise storage enclosures. IC Role / Device Role / Timing Role: High-efficiency DC/DC regulator with Vp-based sequencing to coordinate with PCIe reset and power rails. Use Value: Vp pin enables controlled ramp-up before host enumeration; remote sensing compensates for 50mV IR drop across backplane connectors. |
Use Scenario: Providing 1.2V/15A to ARM-based industrial compute modules operating in -40°C to 85°C ambient. IC Role / Device Role / Timing Role: Robust buck regulator with extended junction temp rating (-40°C to 125°C) and margining support for qualification testing. Use Value: Vref margining (0.4–1.2V) enables production test of voltage tolerance margins; RoHS/halogen-free compliance meets industrial safety standards. |
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) | 20A rated, 4.5–18V input, fixed 500kHz/750kHz options, no remote sense amplifier | Lacks true differential remote sensing and Vp tracking; simpler for cost-sensitive non-server apps | Choose when remote sensing isn't required and board space is constrained (4mm×4mm QFN) |
| TPS53689TSSR (Texas Instruments) | 30A rated, 4.5–18V input, dual-loop D-CAP3 control, integrated telemetry (I2C) | Includes PMBus interface for real-time telemetry but requires external MOSFETs and more layout effort | Choose when digital monitoring, higher current headroom, or adaptive loop tuning are mandatory |
Compared with MP8765GQ-Z and TPS53689TSSR, IR3847MTR1PBF uniquely balances integration (MOSFETs + LDO + remote sense amp), precision (±0.5% VREF), and thermal performance (14.7°C/W) in a single 5mm×6mm package-ideal for space-constrained, high-reliability server and telecom PoL designs where analog simplicity and robustness are prioritized over digital configurability.
Availability
IR3847MTR1PBF is available at Aetrix Electronics and suitable for server core voltage regulation, telecom line card power, storage controller supply, and industrial embedded computing requiring stable component supply and long-term manufacturability.
Supply support for IR3847MTR1PBF 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 broad expertise in high-efficiency power conversion and ruggedized packaging.
The SupIRBuck® product line delivers fully integrated, high-current synchronous buck regulators targeting dense, thermally demanding point-of-load applications in datacenter, networking, and telecom infrastructure.
FAQ
What is the minimum input voltage required for reliable operation with internal LDO biasing?
IR3847MTR1PBF requires Vin ≥ 5.0V for internal LDO operation (VCC/LDO_out generation). When using external Vcc, PVin can go as low as 1.5V. Below 5V on Vin, the Smart LDO cannot sustain gate drive voltage, risking high-side FET dropout and regulation failure-even if PVin is within range. Always verify Vin ≥ 5V when not supplying external Vcc.
How does the OCset pin configure current limit thresholds?
OCset selects one of three factory-trimmed current limits: floating = 25A nominal, tied to VCC = 20A, tied to PGND = 15A. This is achieved via internal resistor dividers and comparator thresholds-not analog scaling. The setting affects both hiccup-mode trip point and current-sense amplifier gain, and remains valid across temperature (-40°C to 125°C).
Can IR3847MTR1PBF safely start into a pre-biased output?
Yes-IR3847MTR1PBF features enhanced pre-bias startup. When enabled into a charged output, it disables the bottom FET until the FB voltage drops below ~0.4V, then gradually ramps the top FET duty cycle. This prevents reverse current flow and avoids damaging downstream loads or causing bus collapse during hot-insertion scenarios.
What is the purpose of the Vp pin, and how should it be used for voltage tracking?
Vp serves as a tracking reference input: when tied to an external voltage ramp (e.g., from another regulator's VOUT), IR3847MTR1PBF adjusts its own output to match that ramp with 1:1 ratio. For basic tracking, connect Vp directly to the master rail through a resistor divider. Leave Vp open (no capacitor) if unused-adding capacitance causes instability due to internal compensation interaction.
IR3847MTR1PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 29-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):
- 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)
IR3847MTR1PBF FAQ
1.How can I place an order for IR3847MTR1PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3847MTR1PBF 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 IR3847MTR1PBF reliable?
The price and inventory of IR3847MTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3847MTR1PBF is usually 5 days.
3.What payment methods are accepted for IR3847MTR1PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3847MTR1PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3847MTR1PBF?
IR3847MTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3847MTR1PBF 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 IR3847MTR1PBF?
For technical support, including IR3847MTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3847MTR1PBF requirements.
6.How does Aetrix verify that IR3847MTR1PBF is sourced from the original manufacturer or authorized distributors?
All IR3847MTR1PBF 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 IR3847MTR1PBF meets industry standards.
7.What is the process for return or replacement of IR3847MTR1PBF?
All IR3847MTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3847MTR1PBF, 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 IR3847MTR1PBF part is unused and in its original packaging.
Return procedure for IR3847MTR1PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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