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Infineon Technologies IR3840WMTRPBF
- Part No.:
- IR3840WMTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 22-PowerVQFN
- Datasheet:
-
IR3840WMTRPBF.pdf
- Description:
- IC REG BUCK ADJ 12A 22PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
IR3840WMTRPBF from Infineon Technologies is a highly integrated 12A synchronous buck regulator with integrated high- and low-side MOSFETs, programmable switching frequency (225–1650 kHz), precision 0.7V ±1% reference, and hiccup-mode overcurrent protection. It delivers up to 96% efficiency at 12A load, supports input voltages from 1.5V to 16V, and regulates output from 0.7V to 0.9×Vin - ideal for server point-of-load applications.
For engineers reviewing the IR3840WMTRPBF datasheet, IR3840WMTRPBF pinout, IR3840WMTRPBF application, or IR3840WMTRPBF equivalent, key selection criteria include its thermal shutdown threshold (140°C), soft-start current (14–26 µA), bootstrap diode forward voltage (180–470 mV), and sequence-tracking capability via the Seq pin.
Technical Context
The IR3840WMTRPBF implements a voltage-mode PWM control architecture with an internal error amplifier (GBWP: 20–40 MHz, slew rate: 7–20 V/µs) and programmable oscillator using an external RT resistor. Its high-bandwidth compensation node (Comp) enables fast transient response in low-voltage, high-current rails.
It integrates boot-diode and driver circuitry optimized for 5 mm × 6 mm PowerQFN package layout, with separate PGND and GND pins to minimize noise coupling. Protection features include pre-bias start-up, under-voltage lockout on Vcc (4.15 V start / 3.85 V stop), and enable-input voltage monitoring (1.2 V turn-on threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Continuous 12A - supports high-density CPU/GPU core rail delivery without external current-sense amplifiers. |
| Input Voltage Range | 1.5V to 16V - compatible with intermediate bus architectures including 3.3V, 5V, 12V, and 15V distribution networks. |
| Output Voltage Range | 0.7V to 0.9×Vin - enables precise low-VDD regulation down to sub-1V for modern SoCs and FPGAs. |
| Switching Frequency | 225 kHz to 1.65 MHz - adjustable via RT resistor; higher frequencies reduce inductor size but increase switching loss. |
| Reference Voltage | 0.7V ±1% (0°C–125°C) - ensures tight output regulation across temperature for DDR memory and ASIC supply rails. |
| Efficiency | >96% peak - achieved with integrated 8.4 mΩ top / 5.7 mΩ bottom MOSFETs and low-loss bootstrap diode (180–470 mV). |
| Junction Temp Range | −40°C to +125°C - qualified for industrial and telecom infrastructure environments with full spec compliance. |
Pinout & Package
IR3840WMTRPBF uses a thermally enhanced 15-pin PowerQFN package (5 mm × 6 mm, 0.9 mm height) with exposed thermal pad for PCB-level heat dissipation. Pin 15 and Pin 4 are both signal ground (GND); Pin 10 is dedicated power ground (PGND) for MOSFET drivers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 Seq | Sequencing control input | Enables simultaneous or staggered power-up with other regulators via external resistor divider; tied to Vcc if unused. |
| 2 FB | Error amplifier inverting input | Connects to output voltage divider; sets regulated output with 0.7V reference; determines feedback loop stability. |
| 3 Comp | Error amplifier output | Interface for external RC compensation network; directly controls PWM duty cycle based on feedback error. |
| 4 & 15 GND | Signal reference ground | Return path for internal bias, reference, and control logic; must be isolated from noisy power ground planes. |
| 5 Rt | Oscillator timing input | Resistor-to-ground sets switching frequency; 9.31 kΩ yields 1.5 MHz, 28.7 kΩ yields 500 kHz, 59 kΩ yields 250 kHz. |
| 6 SS/SD | Soft-start / shutdown control | Capacitor-to-ground sets ramp time; pulled below 0.3V to force immediate shutdown with hiccup recovery. |
| 7 OCSet | Overcurrent threshold set | Resistor from OCSet to SW pin programs current limit; value scales linearly with peak inductor current. |
| 8 PGood | Open-drain power-good indicator | Asserts high when FB reaches 0.77–0.84 V; requires external pull-up to Vcc; delays 256/Fs cycles after threshold crossing. |
| 9 VCC | Internal IC supply | Must be decoupled with ≥1 µF high-frequency ceramic capacitor to PGND; operates only within 4.5–5.5 V range. |
| 10 PGND | Power ground return | Dedicated return for high-side and low-side MOSFET drivers; connects to system power ground plane under thermal pad. |
| 11 SW | Switch node | Connects to inductor and bootstrap capacitor; carries high dv/dt switching waveform; requires tight layout to minimize EMI. |
| 12 VIN | Main input supply | Accepts 1.5–16 V DC; feeds internal LDO for VCC and gate drivers; must be locally bypassed near package. |
| 13 Boot | High-side driver supply | Connected via 0.1 µF capacitor to SW; supplies gate drive for upper MOSFET; voltage = VSW + Vboot (min 4.5 V). |
| 14 Enable | Startup control input | Turns device on when voltage exceeds 1.2 V (±0.16 V); leakage <15 µA; tied to Vcc if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | Co-packaged 8.4 mΩ high-side and 5.7 mΩ low-side FETs eliminate external discrete switches and reduce BOM count. |
| Programmable Soft-Start | Adjustable startup time via external SS capacitor prevents inrush current and output overshoot during power-up. |
| Hiccup Current Limit | Auto-retry protection mode limits fault energy and prevents thermal runaway during sustained overload or short-circuit conditions. |
| Enhanced Pre-Bias Start-up | Allows safe startup into pre-charged output capacitors without reverse current flow or uncontrolled voltage rise. |
| Tracking Sequencing (Seq) | Supports voltage-rail coordination with upstream/downstream regulators using simple resistor-based tracking configuration. |
Applications
| Server Core Voltage Regulation | Storage Controller Power |
|---|---|
Use Scenario: Regulating 0.85V @ 12A for dual-socket Xeon processors in 1U rack servers with constrained airflow. IC Role / Device Role / Timing Role: Primary point-of-load buck regulator delivering stable core voltage with <1% load regulation and <50 µs transient recovery. Use Value: Integrated MOSFETs and 96% efficiency reduce board area and thermal load; Seq pin enables synchronized startup with memory and I/O rails. | Use Scenario: Powering NVMe SSD controller and NAND flash interface in enterprise storage enclosures. IC Role / Device Role / Timing Role: High-efficiency 1.1V/1.8V dual-output capable regulator (with external sequencing) meeting JEDEC JESD22-A108 reliability requirements. Use Value: Precision 0.7V reference and ±1% tolerance ensure stable I/O voltage under dynamic write/read loads; hiccup OCP prevents data corruption during hot-plug events. |
| Embedded Telecom Line Cards | Industrial FPGA Power Supply |
Use Scenario: Providing 1.2V @ 8A and 3.3V @ 3A to DSPs and SerDes transceivers on carrier-grade line cards operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Dual-rail capable regulator supporting independent soft-start and sequencing for analog and digital domains. Use Value: −40°C to +125°C junction rating and MSL2 moisture sensitivity level ensure long-term reliability in sealed telecom housings; thermal shutdown at 140°C protects against fan failure. | Use Scenario: Delivering 0.75V @ 10A to Xilinx Kintex Ultrascale+ FPGA fabric with strict ripple (<10 mVpp) and monotonic startup requirements. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth buck controller with programmable compensation (via Comp pin) for custom loop tuning. Use Value: 20–40 MHz GBWP and 7–20 V/µs slew rate enable fast transient suppression; pre-bias start-up avoids FPGA configuration errors during warm-restart. |
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 | 3A rated, 4.5–55V input, no integrated high-side FET, requires external bootstrap capacitor and MOSFETs | Suitable for lower-current industrial sensors or PLC I/O modules where cost and simplicity outweigh integration needs | Select when output current ≤3A and board space allows discrete FET layout; not drop-in for 12A loads. |
| TPS544B25RVER | 12A, 4.5–18V input, PMBus-enabled, 0.6V reference, integrated telemetry and margining, larger 6×6mm QFN | Targeted at systems requiring digital power management, remote monitoring, and dynamic voltage scaling (e.g., AI accelerators) | Choose when firmware-controlled voltage adjustment, fault logging, or multi-rail coordination via PMBus is required. |
Compared with MP2451DT-LF-Z and TPS544B25RVER, the IR3840WMTRPBF offers highest integration density and analog simplicity for fixed-function 12A PoL designs, while avoiding digital overhead and external FET complexity - making it optimal for cost-sensitive, high-volume server and storage platforms.
Availability
IR3840WMTRPBF is available at Aetrix Electronics and suitable for server applications, storage applications, and embedded telecom systems requiring stable component supply, extended temperature operation, and RoHS-compliant packaging.
Supply support for IR3840WMTRPBF 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 electronics, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.
The IR3840W SupIRBuck™ product line targets high-efficiency, space-constrained point-of-load conversion in datacenter and networking infrastructure, emphasizing integration, thermal robustness, and analog configurability over digital control.
FAQ
What is the minimum recommended output capacitance for stable operation at 12A?
The IR3840WMTRPBF datasheet specifies minimum output capacitance of 220 µF with ≤2 mΩ ESR for 12A operation at 1.8V/600 kHz. This ensures phase margin >45° and peak-to-peak ripple <10 mV. Lower ESR ceramics or polymer caps may reduce total capacitance but require loop compensation verification via Comp pin network.
Can the IR3840WMTRPBF operate with a 3.3V input supply?
Yes - the IR3840WMTRPBF supports input voltages as low as 1.5V, so 3.3V is fully within specification. However, at Vin = 3.3V, maximum achievable output is 0.9 × 3.3V = 2.97V, and efficiency drops due to higher conduction losses in the integrated MOSFETs. For 3.3V input, best practice is to target Vo ≤ 2.5V with Fs ≥ 500 kHz.
How does the Seq pin function in tracking mode?
In tracking mode, the Seq pin accepts an external voltage ramp (e.g., from another regulator's PGood or SS node). When that voltage rises, the IR3840WMTRPBF's FB reference is scaled proportionally, causing its output to track the master rail. If unused, Seq must be tied to Vcc to disable tracking and enable standard regulation.
Is the bootstrap diode truly integrated, or is an external diode required?
The bootstrap diode is fully integrated inside the IR3840WMTRPBF die - no external diode is needed. The datasheet confirms "integrated bootstrap-diode" and specifies forward voltage of 180–470 mV at 30 mA. External 0.1 µF ceramic capacitor from Boot to SW remains mandatory to sustain high-side gate drive during continuous conduction mode.
IR3840WMTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 22-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:
- 22-PQFN (5x6)
IR3840WMTRPBF FAQ
1.How can I place an order for IR3840WMTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3840WMTRPBF 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 IR3840WMTRPBF reliable?
The price and inventory of IR3840WMTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3840WMTRPBF is usually 5 days.
3.What payment methods are accepted for IR3840WMTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3840WMTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3840WMTRPBF?
IR3840WMTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3840WMTRPBF 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 IR3840WMTRPBF?
For technical support, including IR3840WMTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3840WMTRPBF requirements.
6.How does Aetrix verify that IR3840WMTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3840WMTRPBF 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 IR3840WMTRPBF meets industry standards.
7.What is the process for return or replacement of IR3840WMTRPBF?
All IR3840WMTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3840WMTRPBF, 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 IR3840WMTRPBF part is unused and in its original packaging.
Return procedure for IR3840WMTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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