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Infineon Technologies IR3865MTRPBF
- Part No.:
- IR3865MTRPBF
- Manufacturer:
- Infineon Technologies
- Package:
- 17-PowerVQFN
- Datasheet:
-
IR3865MTRPBF.pdf
- Description:
- IC REG BUCK ADJ 10A 17POWERQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,488
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Product details
Overview
IR3865MTRPBF from Infineon Technologies is a highly integrated synchronous buck regulator with integrated high- and low-side MOSFETs, constant on-time hysteretic control, and 10A continuous output capability. It operates from 3V to 21V input, delivers 0.5V–12V output with ±1% reference accuracy, and features programmable switching frequency (up to 750 kHz), thermally compensated overcurrent protection, and power-good signaling - deployed in notebook DC-DC point-of-load (POL) supplies.
For engineers reviewing the IR3865MTRPBF datasheet, IR3865MTRPBF pinout, IR3865MTRPBF application, or IR3865MTRPBF equivalent, key selection criteria include its 4mm × 5mm QFN-17 package, FCCM/DCM mode control via dedicated pin, pre-bias startup support, enable input with voltage monitoring, and absence of external compensation requirements.
Technical Context
The IR3865MTRPBF implements a constant on-time (COT) hysteretic control architecture that eliminates loop compensation components and enables fast transient response without stability tuning. Its internal 23 mΩ high-side and 10.7 mΩ low-side MOSFETs are optimized for 10A continuous operation at TJ ≤ 125°C, with deadtime control (5–30 ns) preventing shoot-through.
It integrates VCC LDO regulation (3.3V/5V compatible), bootstrapped gate drive (BOOT–PHASE), feed-forward (FF) pin for on-time adjustment, and dual-threshold EN input (1.1–1.45V turn-on, 400 mV hysteresis) enabling precise input voltage monitoring and sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 21V - supports wide-input industrial and computing rails including 5V, 12V, and 19V adapter inputs. |
| Output Voltage Range | 0.5V to 12V - covers core logic (0.5–1.2V), I/O (1.8–3.3V), and auxiliary rails (5V, 12V). |
| Continuous Output Current | 10A - delivered with integrated MOSFETs; no external power stage required for POL applications. |
| Reference Accuracy | ±1% at 0.5V - ensures tight output regulation critical for CPU/GPU core voltage tolerance. |
| Switching Frequency | Up to 750 kHz - programmable via FF resistor; balances efficiency, size, and EMI in compact layouts. |
| Thermal Shutdown Threshold | 125°C to 140°C - hysteresis of 20°C prevents thermal oscillation during overload conditions. |
| Power Good Output | Open-drain PGOOD with 25–50 Ω pull-down - provides system-level sequencing and fault reporting. |
Pinout & Package
IR3865MTRPBF uses a thermally enhanced 4mm × 5mm QFN-17 package with exposed thermal pad (PGND-connected) and 0.5 mm pitch. Pin 1 is FCCM; pin 17 is GND. The package supports >32°C/W junction-to-ambient thermal resistance (θJA) on 2-layer PCBs with adequate copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FCCM (Pin 1) | Mode control input | 3.3V logic level selects forced CCM; grounded enables DCM/diode emulation for light-load efficiency. |
| ISET (Pin 2) | Current limit programming | Resistor to PHASE sets overcurrent trip threshold - enables accurate, temperature-compensated OCP. |
| PGOOD (Pin 3) | Open-drain status output | Asserts after soft-start and valid output regulation; used for system power sequencing and fault indication. |
| GND (Pins 4, 17) | Signal ground reference | Dual GND pins reduce noise coupling between analog and power return paths. |
| FB (Pin 5) | Voltage feedback input | Monitors output via resistive divider; also senses over/under-voltage faults for PGOOD and shutdown. |
| SS (Pin 6) | Soft-start/shutdown control | Capacitor to GND sets ramp time; pulled <0.3V to initiate immediate shutdown. |
| 3VCBP (Pin 8) | VCC LDO bypass | 1 µF ceramic capacitor stabilizes internal 3.3V LDO; series resistor may be needed in single-ground designs. |
| VCC (Pin 10) | Gate driver supply | 4.5–5.5V input powers high-side driver; requires ≥1 µF local ceramic decoupling. |
| PGND (Pin 11) | Power ground return | Separate return path for high-current MOSFET sources - minimizes switching noise injection into FB loop. |
| PHASE (Pin 12) | Half-bridge switching node | Connects to inductor; must not exceed 25V DC or -5V transient (100 ns); drives BOOT capacitor. |
| VIN (Pin 13) | Main input supply | 3–21V input rail; feeds both power stage and internal regulators - requires bulk and ceramic input capacitors. |
| BOOT (Pin 14) | Bootstrap supply | Capacitor to PHASE generates floating gate drive voltage for high-side MOSFET. |
| FF (Pin 15) | Feed-forward timing control | Resistor to VIN adjusts on-time inversely with input voltage - maintains stable frequency across line variation. |
| EN (Pin 16) | Enable with voltage monitor | Two-resistor divider sets precise turn-on/off thresholds (e.g., for brown-in/out detection or sequencing). |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Constant on-time control eliminates need for loop compensation components - reduces BOM count and layout sensitivity. |
| Pre-bias startup capability | Allows safe start-up into pre-charged output capacitors - essential for hot-swap and multi-rail sequencing systems. |
| Thermally compensated overcurrent protection | ISET pin current varies with temperature (4400 ppm/°C) - maintains consistent current limit across operating range. |
| Forced CCM / DCM mode selection | Dedicated FCCM pin enables user-selectable conduction mode - optimizes efficiency vs. ripple trade-off per load condition. |
| Precision 0.5V reference (±1%) | Enables accurate low-VOUT regulation down to 0.5V - meets tight tolerances for modern SoC core supplies. |
Applications
| Notebook Core Voltage Regulation | Desktop GPU Power Delivery |
|---|---|
Use Scenario: Regulating CPU/GPU core voltage (e.g., 0.85V @ 8A) in thin-and-light notebooks with strict thermal and space constraints. IC Role / Device Role / Timing Role: Primary synchronous buck POL regulator with integrated power stage and fast transient response. Use Value: Eliminates external MOSFETs and compensation network - reduces solution size by >40% versus discrete controllers. | Use Scenario: Delivering stable 1.1V/10A to discrete graphics cards in desktop PCs with dynamic load steps up to 5A/µs. IC Role / Device Role / Timing Role: High-current, fast-response DC-DC converter with programmable soft-start and PGOOD sequencing. Use Value: Constant on-time control achieves <10 µs recovery from 50% load step - maintains GPU voltage within ±2% spec. |
| Game Console SoC Supply | STB/Smart TV DDR Memory Rail |
Use Scenario: Powering application SoCs (e.g., AMD/ARM-based) in gaming consoles requiring 1.05V/10A with low-noise, low-ripple output. IC Role / Device Role / Timing Role: Main SoC core regulator with pre-bias startup and under/over-voltage protection. Use Value: ±1% reference accuracy and <7.5 mV UV/OV hysteresis ensure reliable SoC operation across temperature and aging. | Use Scenario: Generating 1.2V/6A DDR4 memory supply in set-top boxes where standby efficiency and small footprint are critical. IC Role / Device Role / Timing Role: High-efficiency POL regulator supporting diode-emulation DCM mode for <100 µA quiescent current. Use Value: FCCM pin enables seamless transition between CCM (full load) and DCM (light load) - maintains >85% efficiency from 10 mA to 10 A. |
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 (Monolithic Power Systems) | 6A rated, 2.5–18V input, no integrated VCC LDO, requires external bootstrap capacitor. | Lacks pre-bias startup, FCCM control, and thermally compensated OCP - less suitable for high-reliability computing POL. | Select when lower cost and 6A capacity suffice; verify external bootstrap and sequencing compatibility. |
| TPS54620RGYR (Texas Instruments) | 6A, 4.5–17V input, voltage-mode control with external compensation, 1.5% reference accuracy. | Requires full compensation network and lacks integrated power stage - larger solution size and longer design cycle. | Choose when design flexibility and TI ecosystem support outweigh integration benefits. |
Compared with MP2315DJ-LF-Z and TPS54620RGYR, the IR3865MTRPBF delivers higher current (10A vs. 6A), tighter reference (±1% vs. ±1.5%), and full integration (MOSFETs, LDO, BOOT cap drive) - reducing total component count by ≥12 and simplifying layout for space-constrained POL designs.
Availability
IR3865MTRPBF is available at Aetrix Electronics and suitable for notebook core voltage regulation, desktop GPU power delivery, and game console SoC supply requiring stable component supply, long-term lifecycle support, and MSL2 moisture sensitivity compliance.
Supply support for IR3865MTRPBF 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 global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.
The IR3865 belongs to Infineon's SupIRBuck™ family - engineered specifically for high-density, high-efficiency point-of-load DC-DC conversion in portable and computing applications where integration, thermal performance, and fast transient response are critical.
FAQ
What is the maximum allowable voltage on the PHASE pin?
The PHASE pin has an absolute maximum rating of –5V for transients ≤100 ns and 25V DC. Exceeding these limits risks permanent damage to the internal high-side MOSFET body diode or gate oxide. Layout best practices require minimizing loop area between PHASE, BOOT, and PGND, and using low-ESR/ESL ceramic capacitors adjacent to the IC.
How is the overcurrent protection threshold set and calibrated?
The overcurrent threshold is set by connecting a resistor between ISET (Pin 2) and PHASE (Pin 12). The resulting current (17–21 µA at 25°C, with 4400 ppm/°C tempco) flows through the resistor to generate a voltage proportional to load current. This method provides inherent thermal compensation without external sensors or calibration.
Does the IR3865MTRPBF support output voltage tracking during power-up?
No, the IR3865MTRPBF does not include dedicated voltage tracking functionality. It supports only single-rail soft-start via the SS pin capacitor. For multi-rail tracking (e.g., VDDQ/VDDIO sequencing), external circuitry such as resistor-divider networks or dedicated sequencer ICs must be used in conjunction with the EN and PGOOD signals.
Can the IR3865MTRPBF operate with a 3.3V VCC supply?
No - the VCC pin requires 4.5V to 5.5V. While some internal circuits (e.g., FCCM, SS, FB) accept 3.3V logic levels, the gate driver and internal LDO demand ≥4.5V on VCC to ensure proper high-side MOSFET turn-on and stable operation. Using 3.3V on VCC will result in insufficient gate drive and failure to regulate.
IR3865MTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- SupIRBuck®
- Package/Case:
- 17-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):
- 3V
- Voltage - Input (Max):
- 21V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 10A
- Frequency - Switching:
- Up to 750kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 17-PowerQFN (4x5)
IR3865MTRPBF FAQ
1.How can I place an order for IR3865MTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3865MTRPBF 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 IR3865MTRPBF reliable?
The price and inventory of IR3865MTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3865MTRPBF is usually 5 days.
3.What payment methods are accepted for IR3865MTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3865MTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3865MTRPBF?
IR3865MTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3865MTRPBF 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 IR3865MTRPBF?
For technical support, including IR3865MTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3865MTRPBF requirements.
6.How does Aetrix verify that IR3865MTRPBF is sourced from the original manufacturer or authorized distributors?
All IR3865MTRPBF 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 IR3865MTRPBF meets industry standards.
7.What is the process for return or replacement of IR3865MTRPBF?
All IR3865MTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3865MTRPBF, 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 IR3865MTRPBF part is unused and in its original packaging.
Return procedure for IR3865MTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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