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Infineon Technologies IR3894MTRPBF
- Part No.:
- IR3894MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 16-PowerVQFN
- Datasheet:
-
IR3894MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 12A 16POWERQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,068
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Product details
Overview
IR3894MTRPBF from Infineon Technologies is a 12A synchronous buck regulator with integrated high- and low-side MOSFETs, internal LDO, bootstrap diode, and PWM controller in a single 5mm × 6mm PQFN package. It supports 1.0V–21V input, delivers 0.5V–0.86×Vin output, operates up to 1.5MHz switching frequency, and features programmable power good, thermal shutdown, and pre-bias startup - used in server point-of-load power delivery.
For engineers reviewing the IR3894MTRPBF datasheet, IR3894MTRPBF pinout, IR3894MTRPBF application, or IR3894MTRPBF equivalent, key selection criteria include its thermally compensated current limit (±12A sink/source on Vp), feed-forward line/load regulation, monotonic start-up, and external synchronization capability for multi-rail timing alignment.
Technical Context
The IR3894 implements a voltage-mode PWM control architecture with an integrated error amplifier, precision 0.5V ±0.5% reference, and zero-crossing comparator for adaptive dead-time control. Its feed-forward path improves transient response across wide input ranges, while the smart internal LDO supplies gate drivers independently of input rail stability.
It supports three operational modes: normal regulation (Vref referenced), tracking (Vp referenced), and sequencing (Vref tied to GND). The Rt/Sync pin enables either resistor-set free-running frequency (300–1500 kHz) or external clock synchronization with smooth transition, avoiding beat frequencies in multi-phase systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 12A continuous; supports ±12A source/sink on Vp for precise voltage tracking in multi-rail sequencing. |
| Input Voltage Range | 1.0V–21V (PVIN); 5V–21V for single-rail operation; external VCC bias extends low-input capability. |
| Output Voltage Range | 0.5V–0.86×Vin; set via resistor divider on FB pin; 0.5V reference accurate to ±1.0% over –40°C to +125°C. |
| Switching Frequency | 300–1500 kHz; programmed via RT resistor or synchronized externally; supports phase alignment in multi-phase designs. |
| Efficiency Support | Integrated smart LDO powers gate drivers at 6.4V typical; reduces conduction loss and improves light-load efficiency. |
| Protection Features | Thermally compensated hiccup-mode OCP, UVLO on EN/VCC, OV protection (115–125% Vref), monotonic soft-start/stop, and thermal shutdown. |
| Package | 5mm × 6mm Power QFN (17-pin); separates PGND and SGND for noise isolation between power stage and control circuitry. |
Pinout & Package
IR3894MTRPBF uses a 5mm × 6mm 17-pin Power QFN (PQFN) package with exposed thermal pad. Signal ground (GND) and power ground (PGND) are physically separated to minimize noise coupling between control logic and high-current switching paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Inverting feedback input | Connects to output divider; sets regulated voltage with 0.5V reference; enables margining when Vref is adjusted. |
| 2 Vref | Internal reference voltage node | Provides 0.5V ±0.5% reference; used for margining (0.4–1.2V range) or grounded in tracking mode. |
| 5 Rt/Sync | Frequency programming & sync input | Resistor-to-GND sets free-run frequency; external clock via diode enables jitter-free synchronization. |
| 7 PGood | Open-drain power-good status | Signals valid output (85–95% Vref); supports tracking mode with upper/lower thresholds and 1.28ms delay. |
| 15 Enable | UVLO-enabled enable input | Turns device on/off; resistor divider on PVIN enables input UVLO (1.2V threshold); leakage <1µA. |
| 16 Vp | Tracking reference input | Accepts external voltage for sequencing; supports ±12A source/sink to drive external references or other regulators. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power stage | High-side RDS(on) = 13.2–17.2 mΩ and low-side RDS(on) = 7.2–9.4 mΩ at TJ = 25°C reduce conduction loss and eliminate external MOSFET layout complexity. |
| Feed-forward line regulation | Compensates for input voltage transients in real time, improving load step response without increasing compensation component count. |
| Monotonic soft-start/stop | Controlled 0.2 mV/µs ramp rate ensures no output voltage undershoot or overshoot during power-up/down - critical for FPGA and ASIC rails. |
| Enhanced pre-bias startup | Allows safe startup into pre-biased outputs without reverse current flow, enabling hot-swap and multi-rail sequencing compatibility. |
| Thermally compensated OCP | Hiccup-mode current limit adjusts trip point with junction temperature, maintaining consistent fault protection across –40°C to +125°C operation. |
Applications
| Server Point-of-Load | Telecom Line Card |
|---|---|
|
Use Scenario: Delivering 1.2V/12A to high-performance CPU cores in 1U rack servers with tight thermal constraints. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated core voltage with monotonic start-up and fast transient response. Use Value: Integrated MOSFETs and smart LDO reduce board area by >30% vs discrete solutions while maintaining <±1% output accuracy under dynamic load steps. |
Use Scenario: Powering DSP and FPGA subsystems on telecom line cards requiring coordinated multi-rail sequencing. IC Role / Device Role / Timing Role: Tracking regulator using Vp pin to follow master rail; synchronized via Rt/Sync for deterministic timing alignment. Use Value: ±12A Vp sink/source capability enables direct driving of reference inputs on companion regulators, eliminating external op-amps and reducing BOM count. |
| Storage Controller | Embedded Networking |
|
Use Scenario: Supplying 0.85V/10A to NVMe SSD controllers with strict ripple (<10mVpp) and EMI requirements. IC Role / Device Role / Timing Role: High-frequency (1.2MHz) buck converter minimizing output inductor size while maintaining feed-forward stability. Use Value: Programmable 300–1500kHz switching allows EMI peak shifting and inductor optimization - 0.51µH typical at 1.2MHz vs 1.5µH at 600kHz. |
Use Scenario: Powering packet processing ASICs in industrial Ethernet switches operating from 12V intermediate bus. IC Role / Device Role / Timing Role: Robust PoL regulator with hiccup-mode OCP and thermal shutdown for unattended operation in fanless enclosures. Use Value: Thermally compensated current limit maintains consistent fault threshold across –40°C to +85°C ambient, preventing nuisance trips in variable-temperature deployments. |
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) | 12A rating, 4.5–18V input, fixed 600kHz fSW, no Vp tracking pin, smaller 4mm × 4mm QFN | Lacks Vp-based tracking and external sync; suited for cost-sensitive, single-rail applications without sequencing needs | Select when board space is critical and multi-rail coordination is handled externally. |
| TPS546B24RVFT (TI) | 15A rating, 3–18V input, PMBus interface, digital loop compensation, 3.5mm × 4.5mm VQFN | Supports telemetry and dynamic configuration via PMBus but requires firmware integration and external EEPROM | Select when remote monitoring, margining, or adaptive loop tuning is required in data center infrastructure. |
Compared with MP8765GQ-Z and TPS546B24RVFT, IR3894MTRPBF uniquely balances analog simplicity (no firmware dependency), robust analog tracking (Vp ±12A), and thermal resilience - making it optimal for high-reliability, analog-controlled PoL where deterministic timing and minimal component count are prioritized.
Availability
IR3894MTRPBF is available at Aetrix Electronics and suitable for server point-of-load, telecom line card, and storage controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for IR3894MTRPBF 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 high-efficiency power conversion and reliability-critical applications.
The SupIRBuck™ product line delivers fully integrated DC/DC buck regulators targeting space-constrained, high-current point-of-load applications in servers, networking, and storage - emphasizing analog control fidelity, thermal robustness, and seamless multi-rail coordination.
FAQ
What is the minimum recommended output capacitance for stable operation at 12A?
The IR3894MTRPBF datasheet specifies a minimum 220µF total output capacitance with ≤1.5mΩ ESR for 12A operation at 600kHz. This ensures loop stability and limits output voltage deviation to <±1% under 12A load steps. Ceramic + polymer hybrid configurations are recommended to meet both capacitance and ESR targets while minimizing board area.
Can the IR3894MTRPBF operate without an external Vcc supply?
Yes - the IR3894MTRPBF can self-bias from PVIN when Vin ≥ 6.8V, powering its internal LDO from the input rail. Below 6.8V, the internal LDO enters dropout; an external 4.5–7.5V Vcc supply must be applied to Vcc/LDO_Out to maintain full functionality, including gate drive strength and regulation accuracy.
How does the Vp pin function in tracking mode?
In tracking mode, Vp accepts an external voltage reference (e.g., from another regulator's output) and sources or sinks up to ±12A to force the IR3894's output to match that reference. The error amplifier compares Vp to FB, enabling precise rail-to-rail tracking without external op-amps or discrete components.
Is the IR3894MTRPBF pin-compatible with earlier IR3893 or IR3895 variants?
No - IR3894MTRPBF has a unique 17-pin PQFN footprint and distinct pin assignments (e.g., dedicated Vp, dual GND separation, Rt/Sync multiplexing). IR3893 uses 16-pin QFN with different pinout and lacks Vp; IR3895 is 20-pin with enhanced telemetry. Board redesign is required for substitution.
IR3894MTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 16-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):
- 1V
- Voltage - Input (Max):
- 21V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 18.06V
- Current - Output:
- 12A
- Frequency - Switching:
- 300kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-PowerQFN
IR3894MTRPBF FAQ
1.How can I place an order for IR3894MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3894MTRPBF 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 IR3894MTRPBF reliable?
The price and inventory of IR3894MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3894MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3894MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3894MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3894MTRPBF?
IR3894MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3894MTRPBF 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 IR3894MTRPBF?
For technical support, including IR3894MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3894MTRPBF requirements.
6.How does Aetrix verify that IR3894MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3894MTRPBF 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 IR3894MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3894MTRPBF?
All IR3894MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3894MTRPBF, 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 IR3894MTRPBF part is unused and in its original packaging.
Return procedure for IR3894MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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