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Infineon Technologies IR3842WMTR1PBF
- Part No.:
- IR3842WMTR1PBF
- Manufacturer:
- Infineon Technologies
- Package:
- 15-PowerVQFN
- Datasheet:
-
IR3842WMTR1PBF.pdf
- Description:
- IC REG BUCK ADJ 4A PQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,357
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Product details
Overview
IR3842WMTR1PBF from Infineon Technologies is a fully integrated 4A synchronous buck regulator with on-die high- and low-side MOSFETs, programmable 250–1500 kHz switching frequency, 0.7 V ±1% reference voltage, and -40°C to 125°C junction operation. It delivers precise low-voltage power (0.7 V to 0.9×Vin) in server point-of-load applications.
For engineers reviewing the IR3842WMTR1PBF datasheet, IR3842WMTR1PBF pinout, IR3842WMTR1PBF application, or IR3842WMTR1PBF equivalent, key selection criteria include its integrated bootstrap diode, hiccup-mode overcurrent protection, programmable soft-start via external capacitor, and thermal shutdown with 140°C trip threshold.
Technical Context
The IR3842WMTR1PBF implements a current-mode PWM control architecture with a high-bandwidth error amplifier (GBWP: 20–40 MHz, slew rate: 7–20 V/μs) and internal ramp compensation. Its dual ground structure separates signal (GND) and power (PGND) return paths to minimize noise coupling in high-di/dt switching.
It supports tracking via the SEQ pin using external resistor dividers, enables pre-bias start-up without output voltage reversal, and provides open-drain PGood with 256-cycle delay relative to switching frequency. The OCSET pin sets current limit threshold via an external resistor to SW, with trip levels ranging from 20.8 μA (250 kHz) to 172 μA (1500 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Continuous 4 A load capability at up to 125°C junction temperature |
| Input Voltage Range | 1.5 V to 16 V DC - supports wide-range intermediate bus architectures |
| Output Voltage Range | 0.7 V to 0.9×Vin - enables stable low-VDD core rail generation |
| Switching Frequency | 250 kHz to 1.5 MHz - adjustable via RT pin resistor for EMI/noise optimization |
| Reference Voltage | 0.7 V ±1% (0°C–125°C) - ensures tight output regulation accuracy |
| Efficiency | >95% peak efficiency - achieved via integrated low-Rds(on) MOSFETs (Top: 24.5 mΩ, Bottom: 14.3 mΩ) |
| Thermal Protection | 140°C shutdown with 20°C hysteresis - prevents permanent damage during overload |
Pinout & Package
IR3842WMTR1PBF uses a thermally enhanced 15-pin Power QFN package (5 mm × 6 mm, 0.9 mm height) with exposed thermal pad. 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 input | Enables synchronized power-up with other rails using external resistor divider |
| 2 FB | Error amplifier inverting input | Connects to output voltage divider to set regulated output voltage |
| 3 Comp | Error amplifier output | Interface for external RC compensation network to stabilize control loop |
| 4 & 15 GND | Signal ground | Reference plane for internal bias, reference, and control circuitry |
| 5 Rt | Frequency set input | Resistor-to-ground sets switching frequency (250–1500 kHz) |
| 6 SS/SD | Soft-start/shutdown | Capacitor-to-ground programs startup time; <0.3 V forces shutdown |
| 7 OCSet | Overcurrent threshold | Resistor-to-SW sets current limit; trip level scales with switching frequency |
| 8 PGood | Power-good status | Open-drain output indicating valid output voltage (0.56–0.85 V window) |
| 9 VCC | Bias supply input | Powers internal logic and gate drivers; requires ≥1 μF HF decoupling to PGND |
| 10 PGND | Power ground | Dedicated return path for high-current MOSFET drivers to reduce noise injection |
| 11 SW | Switch node | Connection to external inductor; carries high di/dt switching waveform |
| 12 VIN | Main input supply | Accepts 1.5–16 V input; internal UVLO active below 3.65 V (falling) |
| 13 Boot | High-side driver supply | 0.1 μF capacitor to SW generates floating gate drive voltage for top FET |
| 14 Enable | Enable/disable control | UVLO thresholds: 1.14–1.36 V (start), 0.9–1.06 V (stop) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diode | Eliminates external diode component and associated layout area in high-side gate drive path |
| Enhanced pre-bias start-up | Allows safe start-up into pre-charged output capacitors without reverse current or voltage overshoot |
| Hiccup-mode overcurrent protection | Enters auto-retry shutdown after fault detection, reducing thermal stress during sustained overload |
| Programmable soft-start | Adjustable ramp time via external capacitor prevents inrush current and output voltage overshoot |
| Thermal shutdown with hysteresis | 140°C trip + 20°C hysteresis ensures reliable recovery without oscillation near thermal limit |
Applications
| Server VR12/VR13 Core Rails | Storage Controller I/O Supplies |
|---|---|
Use Scenario: Regulating CPU/GPU core voltage (e.g., 0.8–1.2 V) from 12 V intermediate bus in rack-mounted servers. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering tightly regulated, fast-transient core power. Use Value: 95%+ efficiency reduces board-level heat density; hiccup OCP prevents thermal runaway during cache flush events. | Use Scenario: Powering SAS/SATA controller I/O banks (1.8 V or 3.3 V) in enterprise SSD enclosures. IC Role / Device Role / Timing Role: Secondary buck regulator with tracking (SEQ pin) for coordinated rail sequencing with memory interface supplies. Use Value: Programmable soft-start avoids timing violations during hot-plug insertion; -40°C to 125°C rating supports sealed enclosure thermal profiles. |
| Embedded Telecom Line Cards | Industrial FPGA I/O Banks |
Use Scenario: Generating 1.0 V and 1.8 V rails for DSP/FPGA fabric and transceivers on telecom line cards operating at 65°C ambient. IC Role / Device Role / Timing Role: High-density, thermally robust point-of-load regulator with integrated MOSFETs and PGND separation. Use Value: 5 mm × 6 mm QFN footprint saves PCB area; PGND/GND isolation maintains signal integrity in mixed-signal environments. | Use Scenario: Supplying configurable I/O banks (1.2–3.3 V) on industrial-grade FPGAs deployed in factory automation controllers. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting multiple voltage standards via FB resistor divider. Use Value: 0.7 V ±1% reference enables sub-1% output tolerance; thermal shutdown protects against convection-limited heatsink failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 3A rated, fixed 500 kHz fSW, no SEQ or OCSet programming, smaller 3 mm × 3 mm QFN | Lacks rail tracking and programmable current limit; suited for cost-sensitive, lower-current designs | Select when board space is critical and 3A output suffices with fixed frequency |
| TPS544B25RJER | 4A, PMBus-enabled, 400 kHz–2 MHz fSW, integrated telemetry, larger 5 mm × 5.5 mm QFN | Supports digital configuration and real-time monitoring but requires PMBus interface overhead | Select when system-level telemetry, margining, or dynamic frequency adjustment is required |
Compared with MP2315DJ-LF-Z and TPS544B25RJER, IR3842WMTR1PBF offers analog-programmable flexibility (Rt, OCSet, SS) without digital interface complexity, making it optimal for analog-controlled PoL systems needing robust thermal behavior and hiccup protection.
Availability
IR3842WMTR1PBF is available at Aetrix Electronics and suitable for server applications, storage subsystems, and embedded telecom systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for IR3842WMTR1PBF 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 silicon and silicon carbide power devices.
The SupIRBuck™ product line delivers highly integrated, thermally optimized synchronous buck regulators targeting high-efficiency point-of-load conversion in datacenter, networking, and industrial equipment.
FAQ
What is the minimum recommended output capacitance for stable operation?
The IR3842WMTR1PBF requires ≥22 μF total ceramic output capacitance with ≤5 mΩ ESR for stable 4 A operation at 1.5 MHz. Layout must minimize loop inductance between SW, PGND, and output cap; typical designs use three 10 μF 0603 X5R caps placed adjacent to the IC.
Can the IR3842WMTR1PBF operate with a 1.2 V input supply?
No - the absolute minimum input voltage is 1.5 V per datasheet specifications. Operation below 1.5 V risks undervoltage lockout activation and unregulated output. For sub-1.5 V inputs, consider cascaded architectures or alternative regulators rated for lower Vin.
How is the overcurrent threshold calculated from the OCSet resistor value?
The OCSet pin draws current proportional to switching frequency: IOCSET ≈ (1.2 V / ROCSET) × (fSW / 1 MHz). For example, at 500 kHz with ROCSET = 27 kΩ, IOCSET ≈ 48.8 μA, corresponding to ~12 A valley current limit based on internal scaling.
Is the thermal pad (Pin 16) electrically connected to any internal node?
Yes - the exposed thermal pad is internally connected to PGND and must be soldered to a dedicated PGND copper pour with ≥4 thermal vias (0.3 mm diameter) to inner ground layers. Floating or misconnected pads cause thermal derating and potential instability due to ground bounce.
IR3842WMTR1PBF 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:
- 4A
- 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)
IR3842WMTR1PBF FAQ
1.How can I place an order for IR3842WMTR1PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3842WMTR1PBF 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 IR3842WMTR1PBF reliable?
The price and inventory of IR3842WMTR1PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3842WMTR1PBF is usually 5 days.
3.What payment methods are accepted for IR3842WMTR1PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3842WMTR1PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3842WMTR1PBF?
IR3842WMTR1PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3842WMTR1PBF 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 IR3842WMTR1PBF?
For technical support, including IR3842WMTR1PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3842WMTR1PBF requirements.
6.How does Aetrix verify that IR3842WMTR1PBF is sourced from the original manufacturer or authorized distributors?
All IR3842WMTR1PBF 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 IR3842WMTR1PBF meets industry standards.
7.What is the process for return or replacement of IR3842WMTR1PBF?
All IR3842WMTR1PBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3842WMTR1PBF, 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 IR3842WMTR1PBF part is unused and in its original packaging.
Return procedure for IR3842WMTR1PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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