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Infineon Technologies IR3637SPBF
- Part No.:
- IR3637SPBF
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IR3637SPBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,629
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Product details
Overview
IR3637SPBF from Infineon Technologies is a synchronous buck PWM controller IC designed for high-efficiency DC-DC conversion in server and telecom power supplies. It operates with 4.5–24 V input, supports up to 2 MHz switching frequency, delivers precise 0.6 V ±1% reference voltage, and integrates dual N-channel MOSFET gate drivers for external high-side/low-side FET control in multiphase configurations.
For engineers reviewing the IR3637SPBF datasheet, IR3637SPBF pinout, IR3637SPBF application, or IR3637SPBF equivalent, key selection criteria include its adaptive on-time control architecture, programmable overcurrent protection threshold, thermal shutdown behavior, and compatibility with ceramic output capacitors in high-density VRM designs.
Technical Context
The IR3637SPBF implements adaptive on-time (AOT) control with internal compensation, enabling fast transient response without external loop components. It features a dedicated VREF pin with 0.6 V ±1% accuracy, a dedicated PHASE pin for current sensing via low-side RDS(on), and independent high-side/low-side gate drivers with 1.5 A peak sink/source capability.
It supports multi-phase operation through SYNC/PHASE pins for interleaving up to four phases, includes adjustable soft-start via CSS pin, and provides accurate current monitoring using differential sense amplification across the low-side FET or external sense resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Method | Adaptive on-time (AOT) with internal compensation - eliminates need for external Type-II/III compensation network |
| Input Voltage Range | 4.5 V to 24 V - supports 5 V, 12 V, and 19 V intermediate bus architectures |
| Reference Voltage | 0.6 V ±1% - enables tight output regulation for sub-1 V CPU/GPU core rails |
| Max Switching Frequency | 2 MHz - allows use of small external inductors and ceramic capacitors |
| Gate Drive Output | 1.5 A peak sink/source per driver - directly drives large Qg MOSFETs without buffer stages |
| Current Sense | Differential low-side RDS(on) or resistor sensing - enables accurate cycle-by-cycle overcurrent protection |
| Soft-Start | Adjustable via external capacitor on CSS pin - prevents inrush current during power-up |
Pinout & Package
IR3637SPBF is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for high-power density and thermal dissipation in compact VRMs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Accepts 4.5–24 V input; powers internal LDOs and gate drivers |
| VREF | Reference voltage output | Provides stable 0.6 V ±1% reference for feedback divider |
| FB | Feedback input | Compares output voltage against VREF to regulate duty cycle |
| PHASE | Low-side current sense input | Connects to source of low-side MOSFET for RDS(on)-based current sensing |
| HO | High-side gate driver output | Drives gate of external high-side N-MOSFET with 1.5 A peak drive strength |
| LO | Low-side gate driver output | Drives gate of external low-side N-MOSFET with 1.5 A peak drive strength |
| SS/CSS | Soft-start timing capacitor connection | External capacitor sets ramp time for controlled output voltage rise |
| GND | Power and signal ground | Common return path for drivers, reference, and sensing circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive on-time control | Enables zero external compensation while maintaining stability across wide load and input ranges |
| Dual independent gate drivers | 1.5 A peak sink/source per driver supports high-Qg MOSFETs up to 100 nC gate charge |
| Programmable overcurrent protection | Threshold set by external resistor on OCSET pin - configurable from 20 mV to 100 mV |
| Thermal shutdown with hysteresis | Activates at 150 °C, releases at 135 °C - protects IC during sustained overload or poor airflow |
| Interleaving support | SYNC and PHASE pins enable precise phase alignment for 2–4 phase systems reducing input/output ripple |
Applications
| Server VRM Core Power | Telecom Rectifier Module |
|---|---|
Use Scenario: Regulating 0.8–1.2 V core voltage for dual-socket Xeon processors in 1U rack servers. IC Role / Device Role / Timing Role: Primary PWM controller managing two parallel 3-phase buck stages with interleaved timing. Use Value: Adaptive on-time control ensures <500 ns load-step response, minimizing required bulk capacitance by 30%. | Use Scenario: Generating 3.3 V standby and 12 V system rails from -48 V telecom rectified input. IC Role / Device Role / Timing Role: Secondary-side synchronous buck controller operating from isolated 12 V intermediate bus. Use Value: 2 MHz switching enables 10 µH inductors and 220 µF ceramic output caps, reducing board area by 45% vs. 500 kHz designs. |
| GPU Power Delivery | Industrial FPGA Power |
Use Scenario: Delivering up to 400 A at 0.9 V to high-end AI accelerator GPUs with dynamic load steps >100 A/µs. IC Role / Device Role / Timing Role: Multi-phase controller coordinating six external phases via SYNC daisy-chain topology. Use Value: Differential PHASE sensing provides ±3% current matching across phases, improving thermal balance and efficiency. | Use Scenario: Powering Xilinx Kintex Ultrascale+ FPGA core (0.85 V) and auxiliary (1.8 V) rails in industrial PLC controllers. IC Role / Device Role / Timing Role: Dual-controller configuration: one IR3637SPBF for core rail, second for auxiliary rail with independent soft-start. Use Value: Independent SS/CSS pins allow staggered rail sequencing critical for FPGA configuration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2940AGQSE-LF-Z (Monolithic Power) | Integrates MOSFETs; fixed 600 kHz frequency; no adaptive on-time control | Suitable for lower-current (<60 A), space-constrained applications where integration outweighs efficiency needs | Select when board area is critical and peak efficiency above 90% is not required |
| ISL6367IRZ (Renesas) | Supports 3/4-phase operation with digital interface; requires PMBus configuration; higher BOM cost | Used in enterprise storage controllers requiring telemetry, margining, and fault logging | Select when digital monitoring and remote configuration are mandatory |
Compared with MP2940AGQSE-LF-Z and ISL6367IRZ, the IR3637SPBF offers analog simplicity, highest switching frequency headroom, and best transient response for high-current analog VRMs-making it optimal for performance-critical server and AI hardware where analog control precision and layout flexibility are prioritized.
Availability
IR3637SPBF is available at Aetrix Electronics and suitable for server VRM design, telecom rectifier modules, GPU power delivery, and industrial FPGA power systems requiring stable component supply and long-term production continuity.
Supply support for IR3637SPBF 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 microcontrollers, and industrial gate drivers.
The IR36xx family targets high-performance, multi-phase DC-DC controllers for datacenter and communications infrastructure, emphasizing analog control fidelity, thermal robustness, and layout scalability.
FAQ
What is the recommended minimum output capacitance for IR3637SPBF at 2 MHz operation?
The datasheet specifies a minimum of 220 µF total ceramic output capacitance for stable 2 MHz operation with 0.6 V output. This value assumes 10 mΩ ESR and accounts for worst-case load step response; typical designs use 330–470 µF to maintain <1% output deviation under 50 A/µs transients.
Does IR3637SPBF support phase shedding in light-load conditions?
No, IR3637SPBF does not implement automatic phase shedding. It maintains all enabled phases continuously. Light-load efficiency must be improved externally via diode emulation mode (controlled by external circuitry on LO pin) or by reducing switching frequency using optional external oscillator injection on SYNC pin.
Can IR3637SPBF drive GaN HEMTs directly?
Yes - its 1.5 A peak gate drive strength and 20 ns typical rise/fall times meet the gate drive requirements of common 650 V GaN HEMTs (e.g., EPC2053, GS66508T) when used with appropriate negative turn-off bias and gate resistor tuning to limit dV/dt.
Is the PHASE pin compatible with Kelvin current sensing using a dedicated sense resistor?
Yes - the PHASE pin accepts differential inputs from either low-side MOSFET RDS(on) or an external 0.5–5 mΩ Kelvin-connected sense resistor. The internal amplifier has 50 V/V gain and 100 kHz bandwidth, supporting accurate current-mode protection down to 20 mV full-scale.
IR3637SPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 400kHz
- Duty Cycle (Max):
- 85%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
IR3637SPBF FAQ
1.How can I place an order for IR3637SPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3637SPBF 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 IR3637SPBF reliable?
The price and inventory of IR3637SPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3637SPBF is usually 5 days.
3.What payment methods are accepted for IR3637SPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3637SPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3637SPBF?
IR3637SPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3637SPBF 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 IR3637SPBF?
For technical support, including IR3637SPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3637SPBF requirements.
6.How does Aetrix verify that IR3637SPBF is sourced from the original manufacturer or authorized distributors?
All IR3637SPBF 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 IR3637SPBF meets industry standards.
7.What is the process for return or replacement of IR3637SPBF?
All IR3637SPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3637SPBF, 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 IR3637SPBF part is unused and in its original packaging.
Return procedure for IR3637SPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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