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Infineon Technologies IR3637STRPBF
- Part No.:
- IR3637STRPBF
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IR3637STRPBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,109
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Product details
Overview
IR3637STRPBF from Infineon Technologies is a synchronous buck PWM controller IC designed for high-efficiency DC-DC conversion in point-of-load applications. It operates with 4.5–24 V input, supports up to 60 A output current via external MOSFETs, features adjustable switching frequency from 100 kHz to 1 MHz, and integrates overcurrent, overtemperature, and undervoltage lockout protection. It is used in server VRMs and telecom power supplies.
For engineers reviewing the IR3637STRPBF datasheet, IR3637STRPBF pinout, IR3637STRPBF application, or IR3637STRPBF equivalent, key selection criteria include its adaptive on-time control architecture, integrated bootstrap diode, programmable soft-start time, and compatibility with low-side MOSFET current sensing for accurate load-line regulation.
Technical Context
The IR3637STRPBF implements adaptive on-time (AOT) control to achieve fast transient response without external compensation. It uses valley-current sensing on the low-side FET to enable precise current limit detection and cycle-by-cycle protection.
It supports external synchronization up to 1 MHz, includes an internal 5-V LDO for gate driver bias, and provides dedicated EN/UVLO pin with 1.25 V threshold and hysteresis for reliable startup sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous buck PWM controller - requires external high- and low-side MOSFETs for full power stage implementation. |
| Input Voltage Range | 4.5 V to 24 V - supports 5 V, 12 V, and 24 V intermediate bus architectures. |
| Switching Frequency | 100 kHz to 1 MHz (adjustable via RT resistor or sync signal) - enables optimization of efficiency vs. size for different output filter designs. |
| Current Sensing | Low-side RDS(on) or discrete sense resistor - eliminates need for lossy shunt, reduces BOM count and thermal overhead. |
| Protection Features | OCP, OTP, UVLO, and BOOT under-voltage lockout - ensures safe operation during fault conditions and startup. |
| Soft-Start | Programmable via capacitor on SS pin - prevents inrush current and controls output voltage ramp rate during power-up. |
Pinout & Package
IR3637STRPBF is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for thermal dissipation in high-current regulator designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary power input | Supplies internal circuitry and gate driver; accepts 4.5–24 V input. |
| BOOT | Bootstrap supply for high-side gate driver | Charges external bootstrap capacitor to drive high-side N-channel MOSFET. |
| PHASE | Switch node connection | Connects to drain of high-side FET and source of low-side FET; critical for AOT timing and sensing. |
| CS | Current sense input | Monitors low-side FET RDS(on) or sense resistor voltage for OCP and current-mode operation. |
| EN/UVLO | Enable and undervoltage lockout input | Active-high enable with 1.25 V threshold; disables controller if VIN drops below UVLO threshold. |
| SS | Soft-start timing capacitor | Controls output voltage ramp rate; larger capacitor increases soft-start duration. |
| GND | Power and signal ground | Common reference for all analog and power circuits; connects to thermal pad for heat sinking. |
| SYNC | External clock synchronization input | Accepts TTL/CMOS clock signal up to 1 MHz to align switching with system clock or reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive on-time control | Enables stable operation across wide input/output voltage ranges without loop compensation components. |
| Integrated bootstrap diode | Eliminates external bootstrap diode, reducing component count and layout complexity. |
| Valley-current sensing | Provides accurate cycle-by-cycle current limiting using low-side FET conduction, improving reliability under overload. |
| Programmable switching frequency | Allows trade-off between efficiency (lower fSW) and filter size (higher fSW) via RT resistor or SYNC pin. |
| Thermal shutdown with hysteresis | Shuts down at 150 °C and restarts at 135 °C, preventing thermal runaway in sustained overload conditions. |
Applications
| Server VRM | Telecom Power Supply |
|---|---|
Use Scenario: Regulating 12 V intermediate bus to 1.2 V/60 A CPU core supply in rack-mounted servers. IC Role / Device Role / Timing Role: Primary PWM controller managing high-frequency synchronous buck stage with adaptive timing and current monitoring. Use Value: Delivers tight load-line regulation and sub-10 µs transient response required by modern CPUs. | Use Scenario: Generating 3.3 V/20 A auxiliary rail from 48 V backplane in telecom line cards. IC Role / Device Role / Timing Role: Controller for isolated or non-isolated buck converter with precise current limit and thermal management. Use Value: Enables high-power density design with minimal external components and robust fault handling. |
| Industrial PLC Power | Network Switch ASIC Supply |
Use Scenario: Providing 5 V/15 A logic rail in programmable logic controllers operating in extended temperature environments. IC Role / Device Role / Timing Role: Synchronous buck controller with wide VIN range and industrial-grade thermal protection. Use Value: Ensures continuous operation across -40 °C to +105 °C ambient with no derating. | Use Scenario: Delivering 0.85 V/40 A to high-performance network switch ASICs with strict ripple and transient requirements. IC Role / Device Role / Timing Role: Adaptive on-time controller supporting multi-phase interleaving via SYNC pin. Use Value: Achieves <10 mVpp output ripple and <50 mV undershoot during 80% load step. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8765GQ-Z (Monolithic Power Systems) | Integrated high- and low-side MOSFETs; 30 V max VIN; fixed 500 kHz fSW; no SYNC input. | Lower current capability (12 A); suited for compact, lower-power applications where integration outweighs flexibility. | Select when board space is constrained and 12 A output suffices; avoid for >30 A or sync-critical systems. |
| ISL6269CRZ-T (Renesas) | Multi-phase capable; supports up to 3-phase operation; requires external drivers; 5–24 V VIN; 300–1000 kHz fSW. | Targeted at CPU/GPU VRMs requiring phase interleaving and tighter current balancing. | Choose for multi-phase designs needing current-sharing accuracy; not suitable for single-phase cost-sensitive use cases. |
Compared with MP8765GQ-Z and ISL6269CRZ-T, the IR3637STRPBF offers superior single-phase current scalability (up to 60 A), flexible frequency tuning, and built-in bootstrap diode-making it optimal for high-current, thermally demanding, yet space-constrained server and telecom power stages.
Availability
IR3637STRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom power supplies, and industrial PLC power modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for IR3637STRPBF 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 high-efficiency power conversion solutions.
The IR3637STRPBF belongs to Infineon's IR36xx family of adaptive on-time buck controllers, engineered specifically for high-current, high-density point-of-load regulation in datacenter and communications infrastructure.
FAQ
What is the recommended minimum output capacitance for IR3637STRPBF at 60 A load?
The datasheet specifies ≥1200 µF total output capacitance using low-ESR polymer or MLCC-based arrays. This ensures <10 mVpp ripple at 500 kHz switching and maintains stability under 80% load transients. Layout must minimize high-frequency loop inductance, especially between PHASE, GND, and output capacitors.
Does IR3637STRPBF support ceramic output capacitors exclusively?
Yes - IR3637STRPBF is fully compatible with ceramic-only output filters due to its adaptive on-time control and lack of reliance on ESR for loop stability. The controller's valley-current sensing and internal compensation eliminate the need for bulk electrolytic capacitors, enabling smaller, more reliable designs.
Can IR3637STRPBF be used in multi-phase configurations?
No - IR3637STRPBF is a single-phase controller. While its SYNC pin allows frequency alignment with other controllers, it lacks phase-shift control, current-sharing interfaces, or master/slave configuration pins required for true interleaved multi-phase operation.
What is the typical gate drive capability of the IR3637STRPBF high-side driver?
The high-side driver delivers 1.5 A peak sink/source current into the bootstrap circuit, sufficient to drive 10 nC gate charge MOSFETs at 1 MHz. Rise/fall times are typically 15 ns/12 ns with 1 nF load, ensuring efficient switching and reduced gate losses in high-frequency designs.
IR3637STRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
IR3637STRPBF FAQ
1.How can I place an order for IR3637STRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IR3637STRPBF 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 IR3637STRPBF reliable?
The price and inventory of IR3637STRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IR3637STRPBF is usually 5 days.
3.What payment methods are accepted for IR3637STRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IR3637STRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IR3637STRPBF?
IR3637STRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IR3637STRPBF 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 IR3637STRPBF?
For technical support, including IR3637STRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IR3637STRPBF requirements.
6.How does Aetrix verify that IR3637STRPBF is sourced from the original manufacturer or authorized distributors?
All IR3637STRPBF 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 IR3637STRPBF meets industry standards.
7.What is the process for return or replacement of IR3637STRPBF?
All IR3637STRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IR3637STRPBF, 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 IR3637STRPBF part is unused and in its original packaging.
Return procedure for IR3637STRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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