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Infineon Technologies IR3840MTRPBF
- Part No.:
- IR3840MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 15-PowerVQFN
- Datasheet:
-
IR3840MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 12A PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,467
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Product details
Overview
IR3840MTRPBF from Infineon Technologies is a highly integrated 12A synchronous buck regulator with co-packaged high- and low-side MOSFETs, PWM controller, and bootstrap diode. It delivers precision 0.7V ±1% output voltage across 1.5–16V input, supports programmable 225–1650kHz switching, and enables stable point-of-load regulation in server VRMs and telecom power modules.
For engineers reviewing the IR3840MTRPBF datasheet, IR3840MTRPBF pinout, IR3840MTRPBF application, or IR3840MTRPBF equivalent, key selection criteria include its 12A continuous load capability, integrated thermal protection, pre-bias start-up support, sequencing (Seq) pin for multi-rail tracking, and 5mm × 6mm Power QFN package with dual ground pins (Gnd and PGnd).
Technical Context
The IR3840MTRPBF implements a current-mode synchronous buck architecture with an internal error amplifier (GBWP: 20–40MHz, slew rate: 7–20V/μs) and programmable oscillator via external Rt resistor. Its high-bandwidth control loop enables fast transient response under dynamic load steps typical in CPU/GPU core rails.
It integrates critical system-level functions: hiccup-mode overcurrent protection triggered by OCSet pin voltage, open-drain PGood with 83–93% VREF threshold and 256/Fs delay, and dual UVLO on VCC (4.06–4.46V start) and Enable (1.14–1.36V start) with hysteresis for robust power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 12A continuous - supports single-rail core voltage delivery for mid-tier processors and FPGAs. |
| Input Voltage Range | 1.5V to 16V - compatible with 3.3V, 5V, 12V intermediate bus architectures. |
| Output Voltage Range | 0.7V to 0.9×Vin - enables sub-1V core regulation with tight ±1% reference accuracy. |
| Switching Frequency | 225kHz to 1650kHz - adjustable via Rt resistor for EMI optimization and inductor size trade-off. |
| Efficiency | >96% peak - achieved via integrated 8.3mΩ/5.9mΩ MOSFETs and low-loss bootstrap diode (180–470mV VF). |
| Junction Temp Range | −40°C to +125°C - qualified for industrial and telecom base station environments. |
| Package | 5mm × 6mm Power QFN, 0.9mm height - thermally enhanced layout with separate PGnd and Gnd pins. |
Pinout & Package
IR3840MTRPBF uses a 15-pin Power QFN package with exposed thermal pad, optimized for high-current DC/DC conversion. Signal ground (Pin 4, 15) and power ground (Pin 10) are isolated to minimize noise coupling between control and power paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 Seq | Sequencing reference input | Enables synchronized power-up with other rails using external resistor divider; tied to VCC if unused. |
| 2 FB | Error amplifier inverting input | Connects to output voltage divider to set regulated VOUT; senses feedback with ±1% reference accuracy. |
| 3 Comp | Error amplifier output | Drives external RC compensation network to stabilize control loop bandwidth and phase margin. |
| 4,15 Gnd | Signal ground reference | Provides low-noise return path for internal reference, error amp, and logic circuitry. |
| 5 Rt | Oscillator frequency set | Resistor-to-ground sets switching frequency from 225kHz to 1650kHz; tolerance affects timing accuracy. |
| 6 SS/SD | Soft-start / shutdown control | Capacitor-to-ground programs startup ramp time; pulled below 0.3V to force immediate shutdown. |
| 7 OCSet | Overcurrent threshold set | Resistor-to-SW sets hiccup-mode current limit; value determines trip point (e.g., 48.8μA at 500kHz). |
| 8 PGood | Power-good status output | Open-drain signal asserts after VOUT reaches 83–93% of target and remains stable for 256/Fs delay. |
| 9 VCC | Internal IC supply | Powers control logic and gate drivers; requires ≥1μF high-frequency ceramic capacitor to PGnd. |
| 10 PGnd | Power ground return | Dedicated return for high-side and low-side MOSFET drivers; must connect to power plane near SW node. |
| 11 SW | Switch node | Connects to output inductor and bootstrap capacitor; carries high dv/dt switching waveform. |
| 12 VIN | Main input supply | Accepts 1.5–16V input; routed with low-inductance path to PGnd and input capacitor. |
| 13 Boot | High-side driver supply | 0.1μF capacitor to SW provides floating bias for top MOSFET gate drive. |
| 14 Enable | Startup enable input | UVLO threshold 1.14–1.36V rising; hysteresis ensures clean turn-on/turn-off during brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs + Controller | Eliminates external high-side/low-side FETs and driver IC, reducing BOM count and PCB area by >30% vs discrete solutions. |
| Programmable Hiccup OCP | Configurable current limit with automatic retry after fault clears - prevents thermal runaway during short-circuit events. |
| Enhanced Pre-Bias Start-up | Allows safe startup into pre-charged output capacitors without reverse current flow or output voltage overshoot. |
| Tracking Sequencing (Seq pin) | Supports voltage-ramp synchronization with upstream/downstream rails using simple resistor networks - essential for FPGA and ASIC power sequencing. |
| Thermal Protection | Shuts down at 140°C junction temperature with 20°C hysteresis - protects against sustained overload or airflow loss in enclosed systems. |
Applications
| Server VRM Core Rail | Telecom Line Card Power |
|---|---|
Use Scenario: Regulating 0.85V @ 10A for dual-core Xeon processor in 1U rack server with strict thermal envelope. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering dynamically scaled core voltage with fast load-step response. Use Value: Integrated MOSFETs and 96% efficiency reduce heat sink requirements; Seq pin enables coordinated startup with memory and I/O rails. | Use Scenario: Generating 1.2V @ 8A for packet processing ASIC on carrier-grade line card operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Point-of-load regulator with extended temperature qualification and hiccup-mode fault recovery for unattended operation. Use Value: −40°C to +125°C junction rating and pre-bias start-up ensure reliable cold-start in outdoor cabinets; PGood confirms rail stability before ASIC initialization. |
| Storage Controller Power | Industrial FPGA Power |
Use Scenario: Supplying 1.0V @ 12A to NVMe SSD controller with bursty 20A peak loads during write operations. IC Role / Device Role / Timing Role: High-current buck regulator with high-bandwidth error amplifier and programmable soft-start to manage inrush. Use Value: 12A continuous rating and 1.5MHz max switching allow compact 0.6μH inductor; OCSet pin enables precise current limiting during NAND programming peaks. | Use Scenario: Powering 0.75V @ 9A Artix-7 FPGA in factory automation PLC with vibration-prone mounting and no active cooling. IC Role / Device Role / Timing Role: Thermally robust, fully integrated buck converter with independent PGnd/Gnd isolation for noise-sensitive logic rails. Use Value: Exposed thermal pad and 0.9mm low-profile QFN improve conduction cooling; dual UVLO on Enable and VCC prevents erratic behavior during brownouts. |
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 | 6A rated, 3.3–36V input, no integrated high-side MOSFET, requires external bootstrap capacitor. | Lacks integrated MOSFETs and sequencing pin; suitable only for lower-current, non-tracking designs. | Select when cost sensitivity outweighs integration benefits and load current stays below 6A. |
| TPS544B20RJRT | 15A rated, 4.5–18V input, PMBus interface, digital control, 3.5mm × 3.5mm QFN. | Supports telemetry and dynamic voltage scaling but adds firmware complexity and higher BOM cost. | Select when digital monitoring, margining, or adaptive frequency control is required in data center applications. |
Compared with MP2451DT-LF-Z and TPS544B20RJRT, the IR3840MTRPBF offers optimal balance of integration (co-packaged MOSFETs, bootstrap diode), analog programmability (Rt, OCSet, SS), and sequencing capability - making it ideal for cost-sensitive, high-reliability analog point-of-load designs where digital overhead is unnecessary.
Availability
IR3840MTRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom line cards, storage controllers, and industrial FPGA power supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for IR3840MTRPBF 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 MCUs, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.
The IR3840 belongs to Infineon's SupIRBuck™ family - engineered for high-efficiency, space-constrained point-of-load regulation in computing and communications infrastructure where integration, thermal performance, and reliability are critical.
FAQ
What is the minimum recommended output capacitance for stable operation at 12A?
The IR3840MTRPBF datasheet specifies a minimum 220μF total output capacitance using low-ESR polymer or MLCCs for 12A operation. This ensures <1% output voltage deviation during 10A/μs load transients and maintains phase margin above 45° with standard 0.6μH inductors. Layout must minimize loop inductance between PGnd, SW, and output caps.
Can the IR3840MTRPBF operate with a 3.3V input supply?
Yes - the IR3840MTRPBF supports input voltages from 1.5V to 16V, including 3.3V intermediate bus rails. At 3.3V input, maximum output voltage is 2.97V (0.9×Vin), and efficiency exceeds 92% at 5A load with 1MHz switching. Ensure VCC is properly decoupled and boot capacitor is sized for reduced duty cycle.
How does the Seq pin enable voltage tracking during power-up?
The Seq pin accepts an external resistor divider from VOUT of a master rail. When the master rail rises, the divided voltage at Seq crosses the internal 0.8V threshold, enabling the IR3840MTRPBF's soft-start circuit. This forces follower rail startup to mirror master rail ramp rate - achieving ±2% tracking accuracy without additional ICs.
Is the IR3840MTRPBF pin-compatible with lower-current variants in the same family?
Yes - the IR3840MTRPBF shares identical 15-pin Power QFN footprint and pinout with IR3839 (4A) and IR3842 (8A), enabling scalable design reuse. Key signals (FB, COMP, Rt, OCSet, SS/SD, Enable, Seq) occupy identical positions; only MOSFET Rds(on) and thermal design differ across variants.
IR3840MTRPBF 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:
- 12A
- 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)
IR3840MTRPBF FAQ
1.How can I place an order for IR3840MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3840MTRPBF 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 IR3840MTRPBF reliable?
The price and inventory of IR3840MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3840MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3840MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3840MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3840MTRPBF?
IR3840MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3840MTRPBF 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 IR3840MTRPBF?
For technical support, including IR3840MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3840MTRPBF requirements.
6.How does Aetrix verify that IR3840MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3840MTRPBF 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 IR3840MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3840MTRPBF?
All IR3840MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3840MTRPBF, 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 IR3840MTRPBF part is unused and in its original packaging.
Return procedure for IR3840MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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