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Infineon Technologies IRU3037CSTRPBF
- Part No.:
- IRU3037CSTRPBF
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IRU3037CSTRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,503
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Product details
Overview
IRU3037CSTRPBF from Infineon Technologies (formerly International Rectifier) is a fixed-frequency, voltage-mode synchronous PWM controller in an 8-pin SOIC package, designed for low-cost, high-efficiency buck DC-DC conversion. It operates from a single 5V or 12V supply, features a 200 kHz internal oscillator, 500 mA peak gate drive capability, under-voltage lockout on both Vcc (4.2 V threshold) and Vc (3.3 V threshold), and latching output undervoltage protection at 0.6 V - enabling reliable DDR memory Vtt source/sink regulation.
For engineers reviewing the IRU3037CSTRPBF datasheet, IRU3037CSTRPBF pinout, IRU3037CSTRPBF application, or IRU3037CSTRPBF equivalent, key selection criteria include its 200 kHz switching frequency, SOIC-8 lead-free packaging, programmable soft-start via external capacitor, synchronous N-MOSFET drive architecture, and integrated short-circuit latch-off behavior critical for stable point-of-load regulation.
Technical Context
The IRU3037CSTRPBF implements a voltage-mode control loop with a precision 1.25 V reference and transconductance error amplifier (gm = 600 µmho), comparing feedback voltage against a linear sawtooth ramp generated by its 200 kHz oscillator. Its dual 0.5 A peak gate drivers (HDrv/LDrv) support external N-channel MOSFETs in synchronous buck topology, with dead-time management to prevent shoot-through.
Protection logic includes independent UVLO on Vcc and Vc supplies, output undervoltage detection (latches off at Fb < 0.6 V), and soft-start initiated only after both supplies exceed thresholds - ensuring controlled startup without input current surge or output overshoot in DDR Vtt and ASIC core supply applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 200 kHz - sets fixed switching period for predictable EMI profile and inductor sizing in 5V-to-1.8V/3.3V buck converters. |
| Reference Voltage (Fb) | 1.25 V ±1.2% - defines output voltage setpoint accuracy when used with external resistor divider (e.g., 3.3 V @ R5=1.24 kΩ, R6=249 Ω). |
| Peak Output Drive Current | 500 mA - sufficient to rapidly charge/discharge gate capacitance of dual N-MOSFETs like IRF7313 in <100 ns rise/fall times. |
| Vcc UVLO Threshold | 4.2 V with 0.2 V hysteresis - prevents erratic operation during brown-out; resumes only after Vcc rises above 4.4 V. |
| Vc UVLO Threshold | 3.3 V with 0.2 V hysteresis - ensures high-side driver remains disabled until boost rail is valid, avoiding shoot-through risk. |
| Fb Undervoltage Latch | 0.6 V threshold - triggers permanent shutdown on output short, requiring power cycle or SS/SD pin reset. |
| Soft-Start Charge Current | 75 µA - enables precise startup time control (e.g., 7.5 ms with 0.1 µF capacitor) to limit inrush current in dense PCB layouts. |
Pinout & Package
IRU3037CSTRPBF is housed in an 8-pin plastic SOIC NB (Small Outline Integrated Circuit, Narrow Body) package, RoHS-compliant and lead-free (PbF). Thermal resistance θJA = 124°C/W supports operation up to 125°C junction temperature in compact power stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Fb | Error amplifier inverting input | Connects to resistor divider from output; regulates voltage by maintaining 1.25 V at this node - direct setpoint interface. |
| 2 - Vcc | Bias supply input | Powers internal logic and low-side driver; requires ≥1 µF ceramic bypass to GND for transient current delivery. |
| 3 - LDrv | Low-side MOSFET gate driver output | Sinks/sources up to 500 mA; drives source of synchronous N-MOSFET (e.g., IRF7313 lower half) directly. |
| 4 - Gnd | Analog/digital ground reference | Mandatory low-impedance connection to PCB ground plane; decoupling caps (Vcc/Vc → Gnd) must land here. |
| 5 - HDrv | High-side MOSFET gate driver output | Drives gate of upper N-MOSFET; requires external bootstrap diode (BAT54) and ≥1 µF capacitor to Vc for floating bias. |
| 6 - Vc | High-side driver boost supply | Must be ≥4 V above output bus (e.g., 8–12 V for 3.3 V output); powers HDrv via internal charge pump. |
| 7 - Comp | Error amplifier compensation node | External RC network (e.g., 10 kΩ + 1 nF) connects here to GND to stabilize control loop phase margin. |
| 8 - SS/SD | Soft-start / shutdown control | Internal 75 µA current source charges external cap for soft-start; pulled <0.5 V to force immediate shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-frequency voltage-mode control | Eliminates need for external timing components; simplifies loop compensation and EMI filtering vs. current-mode designs. |
| Latching output undervoltage protection | Prevents thermal runaway during sustained short-circuit by disabling PWM until power cycle - no auto-retry risk. |
| Independent Vcc and Vc UVLO | Ensures safe sequencing: low-side driver enabled only after Vcc valid; high-side driver enabled only after Vc valid. |
| Programmable soft-start with external capacitor | Enables adjustable startup ramp (e.g., 0.1–1 µF yields 7.5–75 ms), critical for preventing inrush into large output capacitors. |
| 500 mA peak gate drive with matched rise/fall | Supports fast-switching MOSFETs (e.g., IRF7313) while minimizing dead-time uncertainty and conduction loss. |
Applications
| DDR Memory Vtt Regulation | ASIC Core Supply (1.8 V) |
|---|---|
|
Use Scenario: Providing bidirectional termination voltage (Vtt) for DDR2/DDR3 memory buses with dynamic sourcing and sinking up to ±2 A. IC Role / Device Role / Timing Role: Synchronous buck controller managing real-time Vtt tracking to half-VDDQ, synchronized to memory clock edges via fast transient response. Use Value: Enables stable Vtt within ±15 mV tolerance using 1.25 V reference and low-ESR output caps, meeting JEDEC DDR timing specs. |
Use Scenario: Generating 1.8 V core supply for FPGA or microprocessor ASICs drawing >3 A with tight load-step regulation. IC Role / Device Role / Timing Role: Primary point-of-load (POL) regulator delivering low-noise, high-efficiency power with 200 kHz fixed frequency for predictable filter design. Use Value: Achieves >90% efficiency at full load using dual N-MOSFETs and 500 mA drivers, reducing thermal density on dense logic boards. |
| Graphics Card GPU Auxiliary Rail | Hard Disk Drive +5 V to +3.3 V Conversion |
|
Use Scenario: Powering GPU I/O or memory interface rails in discrete graphics cards where space and thermal constraints limit use of modules. IC Role / Device Role / Timing Role: Compact, SOIC-packaged controller enabling high-current buck stage adjacent to GPU die with minimal layout area. Use Value: Delivers 4 A at 1.2 V with <100 mV ripple using 7 µH inductor and 300 µF low-ESR output capacitance - meets PCIe graphics spec. |
Use Scenario: Converting +5 V main rail to +3.3 V logic supply in HDD controller boards with strict cost and footprint targets. IC Role / Device Role / Timing Role: Low-cost, discrete-component buck solution replacing linear regulators to eliminate >2 W heat dissipation at 2 A load. Use Value: Reduces board temperature rise by >15°C vs. LDO, extending HDD reliability in sealed enclosures without forced airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRU3037ACSTRPBF | 400 kHz oscillator frequency; 0.8 V reference voltage; 0.4 V Fb UVLO threshold | Better suited for higher-frequency designs requiring smaller magnetics and faster transient response | Select when optimizing for size/efficiency trade-off over cost; verify loop stability with 400 kHz ramp amplitude |
| TPS5430DR | Integrated high/low-side MOSFETs; 3.5 A output; 500 kHz switching; external compensation | Single-chip solution eliminating external FETs and gate drive complexity | Choose when board space is constrained and 3.5 A max output suffices; IRU3037CSTRPBF retains flexibility for >5 A with discrete FETs |
Compared with IRU3037ACSTRPBF, the CSTRPBF offers lower EMI and relaxed layout demands due to 200 kHz operation; versus TPS5430DR, it provides higher current scalability and thermal separation between controller and power stage - critical for industrial-grade reliability.
Availability
IRU3037CSTRPBF is available at Aetrix Electronics and suitable for DDR memory Vtt regulation, ASIC core supply generation, and graphics card auxiliary rail applications requiring stable component supply across extended production lifecycles.
Supply support for IRU3037CSTRPBF 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 global semiconductor leader specializing in power management, automotive, and industrial control ICs, with deep expertise in high-efficiency DC-DC conversion architectures.
The IRU3037 series belongs to Infineon's legacy synchronous buck controller product line, engineered specifically for cost-sensitive, high-current point-of-load applications in computing and storage systems where discrete MOSFET flexibility and robust protection are essential.
FAQ
What is the maximum recommended operating junction temperature for IRU3037CSTRPBF?
The absolute maximum operating junction temperature is 125°C, and the device is characterized for continuous operation from 0°C to 125°C. Thermal design must ensure θJA ≤ 124°C/W with adequate copper pour and airflow; exceeding 125°C risks permanent damage to internal gate drivers and reference circuitry.
Can IRU3037CSTRPBF drive both high-side and low-side N-channel MOSFETs without external level-shifting?
Yes - the integrated high-side driver uses an internal charge pump powered by the Vc pin (requiring ≥4 V above output voltage) to generate the necessary gate-source voltage for the upper N-MOSFET; no external level shifter is needed when Vc is properly biased with a bootstrap capacitor and diode.
How does the latching undervoltage protection behave during a sustained output short?
When Fb falls below 0.6 V, the IRU3037CSTRPBF disables both HDrv and LDrv outputs and holds them off indefinitely - no automatic recovery occurs. The only recovery methods are cycling Vcc/Vc supplies or pulling SS/SD below 0.5 V to reset the latch, preventing uncontrolled restart under fault conditions.
Is the 1.25 V reference voltage trimmed at production, and what is its temperature drift?
The 1.25 V reference is factory-trimmed to ±1.2% over 0°C to 70°C ambient, with typical drift of ±30 ppm/°C. Over full junction range (0–125°C), total variation remains within ±2.5%, enabling accurate output programming using 1% metal-film resistors in the feedback divider.
IRU3037CSTRPBF 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-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.2V ~ 25V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
IRU3037CSTRPBF FAQ
1.How can I place an order for IRU3037CSTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRU3037CSTRPBF 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 IRU3037CSTRPBF reliable?
The price and inventory of IRU3037CSTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRU3037CSTRPBF is usually 5 days.
3.What payment methods are accepted for IRU3037CSTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRU3037CSTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRU3037CSTRPBF?
IRU3037CSTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRU3037CSTRPBF 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 IRU3037CSTRPBF?
For technical support, including IRU3037CSTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRU3037CSTRPBF requirements.
6.How does Aetrix verify that IRU3037CSTRPBF is sourced from the original manufacturer or authorized distributors?
All IRU3037CSTRPBF 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 IRU3037CSTRPBF meets industry standards.
7.What is the process for return or replacement of IRU3037CSTRPBF?
All IRU3037CSTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRU3037CSTRPBF, 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 IRU3037CSTRPBF part is unused and in its original packaging.
Return procedure for IRU3037CSTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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