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Infineon Technologies IR3640MPBF
- Part No.:
- IR3640MPBF
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
IR3640MPBF.pdf
- Description:
- IC REG CTRLR BUCK 20MLPQ
- Quantity:
- Payment:
- Shipping:
Inventory:1,959
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Product details
Overview
IR3640MPBF from Infineon Technologies is a synchronous buck PWM controller IC for high-performance point-of-load DC/DC conversion. It supports 1.5V–24V input, delivers 0.7V–0.9×Vin output with ±1% reference accuracy (0°C–125°C), operates up to 1.5MHz, and integrates MOSFET drivers, bootstrap diode, and power-good output-used in server VRMs and game console power rails.
For engineers reviewing the IR3640MPBF datasheet, IR3640MPBF pinout, IR3640MPBF application, or IR3640MPBF equivalent, key selection criteria include programmable OCP via OCset pin, external sync capability, hiccup-mode overcurrent protection, pre-bias startup support, and thermal shutdown with 140°C trip point.
Technical Context
The IR3640MPBF implements single-loop voltage-mode control with a 20-pin MLPQ (3mm×4mm) package, enabling precise regulation across wide line/load/temperature variations. Its oscillator supports 225–1650kHz via RT resistor, and error amplifier features 100–120dB DC gain, 20–40MHz GBWP, and ±10mV offset-ensuring fast transient response and stable loop dynamics.
Driver stages deliver 2.0–5.0Ω high-side source impedance and 0.4–1.0Ω low-side sink impedance, with 10–45ns dead-time control and integrated bootstrap diode (180–470mV VF). Protection includes OVP at 110–120% Vref, UVLO hysteresis of 0.25–0.38V on Vcc, and thermal shutdown with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 24V - supports wide-range industrial and telecom inputs without pre-regulation |
| Output Voltage Accuracy | ±1% over 0°C–125°C - ensures tight regulation for CPU/GPU core rails |
| Switching Frequency | 225kHz to 1.5MHz - selectable via RT resistor for efficiency vs. size trade-off |
| Reference Voltage | 0.7V ±1% - enables sub-1V output with high precision for modern SoCs |
| Operating Junction Temp | −40°C to +125°C - qualified for harsh thermal environments in servers and consoles |
| OCP Method | Hiccup mode using Rds(on) sensing - limits fault energy while enabling auto-recovery |
| Package | 20-lead MLPQ (3mm × 4mm) - compact footprint with exposed thermal pad (θJC = 4°C/W) |
Pinout & Package
IR3640MPBF uses a 20-lead MLPQ (3mm × 4mm) thermally enhanced package with exposed copper pad on underside, requiring vias to internal ground plane for optimal thermal performance (θJA = 36°C/W on 4-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | IC bias supply input | 4.5–5.5V regulated supply for internal logic and gate drivers |
| PVcc | High-side driver supply | Separate 4.5–5.5V rail for robust high-side gate drive |
| Boot | Bootstrap capacitor node | Charges bootstrap capacitor to enable N-channel high-side MOSFET drive |
| SW | Switch node | Connects to drain of high-side FET and source of low-side FET |
| HDrv | High-side gate driver output | Drives gate of external high-side N-MOSFET with 2–5Ω source impedance |
| LDrv | Low-side gate driver output | Drives gate of external low-side N-MOSFET with 0.4–1.0Ω sink impedance |
| Fb | Error amplifier inverting input | Monitors output voltage via resistive divider for regulation |
| OCset | Overcurrent threshold programming | Sets hiccup-mode OCP trip level via external resistor |
| Rt | Oscillator frequency setting | Resistor from this pin to GND sets switching frequency (225–1650kHz) |
| PGood | Open-drain power-good indicator | Signals valid output voltage (83–93% Vref) after soft-start |
Key Features
| Feature | Design Value |
|---|---|
| Programmable soft-start | SS/SD pin controls ramp time and enables shutdown with 14–26μA current source |
| Enhanced pre-bias startup | Allows safe start-up into pre-charged output without reverse current or overshoot |
| Output voltage tracking | SEQ pin supports coordinated power sequencing with other rails in multi-rail systems |
| External synchronization | SYNC pin accepts 225–1650kHz clock to align switching with system timing |
| Integrated bootstrap diode | On-chip 180–470mV forward-drop diode eliminates external component and saves board space |
Applications
| Server VRM Power Stage | Game Console Core Rail |
|---|---|
Use Scenario: Regulating 0.85V @ 60A for CPU cores in dual-socket rack servers. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current, low-voltage POL conversion with fast transient response. Use Value: ±1% Vref accuracy and 1.5MHz operation enable tight regulation and small output filter size under dynamic load steps. | Use Scenario: Generating 0.9V core supply for GPU in high-end gaming console motherboard. IC Role / Device Role / Timing Role: Voltage-mode buck controller driving discrete N-MOSFETs with programmable OCP and hiccup recovery. Use Value: Pre-bias startup prevents output collapse during hot-plug events; thermal shutdown protects against sustained overload. |
| Network Switch ASIC Supply | Industrial FPGA I/O Bank |
Use Scenario: Delivering 1.2V @ 25A to packet processing ASIC in 10G Ethernet switch line card. IC Role / Device Role / Timing Role: High-frequency (1MHz+) buck controller with external sync for EMI reduction in dense backplane layouts. Use Value: 20-pin MLPQ package and integrated bootstrap diode reduce BOM count and improve layout density. | Use Scenario: Providing 1.8V @ 12A to configurable I/O banks in ruggedized industrial FPGA system. IC Role / Device Role / Timing Role: Robust POL controller with −40°C to +125°C operation and OVP/OCP/thermal protection. Use Value: Wide 1.5–24V input range accommodates unregulated 12V/24V field power; PG output enables safe FPGA configuration sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6269CRZ-T | Fixed 600kHz frequency, no RT pin; requires external bootstrap diode; 16-pin QFN | Lacks programmable frequency and integrated bootstrap diode - less flexible for EMI optimization and BOM reduction | Choose when fixed-frequency operation and lower cost outweigh need for frequency tuning and integration |
| TPS54620RGYR | Current-mode control; integrated high/low-side FETs; 17V max Vin; 4.5–17V input range | Monolithic design eliminates external MOSFETs but limits max input voltage and thermal scalability | Prefer for space-constrained designs where 17V input suffices and discrete FETs are undesirable |
Compared with ISL6269CRZ-T and TPS54620RGYR, the IR3640MPBF offers wider input range (1.5–24V), higher max frequency (1.5MHz), integrated bootstrap diode, and true hiccup-mode OCP-making it optimal for high-reliability, thermally demanding, and EMI-sensitive POL systems requiring discrete FET flexibility.
Availability
IR3640MPBF is available at Aetrix Electronics and suitable for server VRMs, game console power supplies, and network switch ASIC rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for IR3640MPBF 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 IR3640MPBF belongs to Infineon's high-frequency synchronous buck controller product line, designed specifically for precision, high-current point-of-load regulation in datacenter, networking, and consumer electronics infrastructure.
FAQ
What is the minimum recommended input voltage for reliable operation?
The IR3640MPBF supports input voltages as low as 1.5V, verified across −40°C to +125°C junction temperature. Operation below 1.5V is not guaranteed per absolute maximum ratings and may cause undervoltage lockout or loss of regulation due to insufficient headroom for driver circuitry and internal bias generation.
How does the hiccup-mode overcurrent protection behave during sustained overload?
Under sustained overcurrent, the IR3640MPBF enters hiccup mode: it disables switching, waits ~4096 clock cycles, then attempts restart. This cycle repeats until fault clears. The behavior is confirmed by SS_Hiccup parameter (4096 cycles) and OCSET current specifications across frequency bands, limiting average power dissipation and preventing thermal runaway.
Can the IR3640MPBF drive both high-side and low-side N-channel MOSFETs without external level shifters?
Yes-the IR3640MPBF integrates dedicated high-side and low-side N-MOSFET drivers with bootstrap architecture (via Boot/SW pins) and independent PVcc/Vcc supplies. No external level shifter is required; the high-side driver uses the bootstrap capacitor to generate gate voltage above SW, enabling full enhancement of N-channel devices.
Is the 0.7V reference voltage internally trimmed and tested across temperature?
Yes-the 0.7V reference is trimmed and specified with ±1% tolerance over 0°C to +125°C (per Electrical Specifications table), and ±2% over −40°C to +125°C. Typical Vfb vs. temperature plots (page 8) confirm monotonic drift within ±4mV across full range, validated by production test correlation per Note3.
IR3640MPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Frequency - Switching:
- 225kHz ~ 1.65MHz
- Duty Cycle (Max):
- 92%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Sequencing, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-MLPQ (3x4)
IR3640MPBF FAQ
1.How can I place an order for IR3640MPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3640MPBF 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 IR3640MPBF reliable?
The price and inventory of IR3640MPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3640MPBF is usually 5 days.
3.What payment methods are accepted for IR3640MPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3640MPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3640MPBF?
IR3640MPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3640MPBF 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 IR3640MPBF?
For technical support, including IR3640MPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3640MPBF requirements.
6.How does Aetrix verify that IR3640MPBF is sourced from the original manufacturer or authorized distributors?
All IR3640MPBF 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 IR3640MPBF meets industry standards.
7.What is the process for return or replacement of IR3640MPBF?
All IR3640MPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3640MPBF, 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 IR3640MPBF part is unused and in its original packaging.
Return procedure for IR3640MPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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