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Infineon Technologies IRU3037ACF
- Part No.:
- IRU3037ACF
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
IRU3037ACF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,807
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Product details
Overview
IRU3037ACF from Infineon Technologies is a fixed-frequency, voltage-mode synchronous PWM controller in an 8-pin TSSOP package, designed for on-board DC-DC buck conversion with 400 kHz switching frequency, 1.25 V reference voltage (IRU3037A variant), and 500 mA peak gate drive capability. It enables low-cost, high-efficiency 5V-to-1.8V/2.5V/3.3V regulation for DDR memory Vtt source/sink and graphics card power rails.
For engineers reviewing the IRU3037ACF datasheet, IRU3037ACF pinout, IRU3037ACF application, or IRU3037ACF equivalent, key selection criteria include its 400 kHz oscillator, programmable soft-start via external capacitor, UVLO thresholds (Vcc = 4.2 V, Vc = 3.3 V), latch-off under-voltage protection (0.4 V Fb threshold), and dual N-channel MOSFET drive architecture for synchronous rectification.
Technical Context
The IRU3037ACF implements voltage-mode PWM control using a precision 1.25 V internal reference, error amplifier with transconductance of 600 µmho, and linear sawtooth ramp generator synchronized to its 400 kHz oscillator. Feedback is taken from the output via resistor divider at the Fb pin, with loop compensation applied externally at the Comp pin.
It integrates under-voltage lockout for both Vcc (4.2 V threshold, 0.2 V hysteresis) and Vc (3.3 V threshold, 0.2 V hysteresis), plus output short-circuit protection that latches off PWM when Fb falls below 0.4 V. Soft-start is implemented by an internal 25 µA current source charging an external capacitor connected to SS/SD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 400 kHz - sets fixed switching period for predictable EMI profile and inductor sizing. |
| Reference Voltage (Fb) | 1.25 V - defines output voltage setpoint via external resistor divider (e.g., 3.3 V = 1.25 V × (1 + R6/R5)). |
| UVLO Threshold (Vcc) | 4.2 V - prevents operation until bias supply stabilizes; hysteresis of 0.2 V avoids chatter near threshold. |
| Fb Under-Voltage Latch | 0.4 V - triggers permanent shutdown during output short, protecting downstream loads and MOSFETs. |
| Peak Output Drive Current | 500 mA - sufficient to rapidly charge/discharge gate capacitance of dual N-channel MOSFETs like IRF7313. |
| Soft-Start Charge Current | 25 µA - enables precise startup time control (e.g., 7.5 ms with 0.1 µF capacitor). |
| Max Duty Cycle | 83% - supports wide input-to-output voltage ratios (e.g., 5 V → 3.3 V, D ≈ 66%). |
Pinout & Package
IRU3037ACF is housed in an 8-pin plastic TSSOP (F) package with exposed thermal pad, optimized for surface-mount assembly and thermal dissipation in space-constrained board areas.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Fb | Error amplifier inverting input | Connects to resistor divider output; regulates output voltage by comparing against 1.25 V internal reference. |
| 2 - Vcc | Bias supply input | Powers internal logic and low-side driver; requires ≥1 µF high-frequency bypass to GND. |
| 3 - LDrv | Low-side MOSFET gate driver output | Sources/sinks up to 500 mA to drive N-channel sync FET; referenced to GND. |
| 4 - Gnd | Analog/digital ground reference | Mandatory low-impedance connection to PCB ground plane; decoupling caps must tie here. |
| 5 - HDrv | High-side MOSFET gate driver output | Drives N-channel control FET; requires external bootstrap diode (e.g., BAT54) and 1 µF cap to Vc. |
| 6 - Vc | High-side driver boost supply | Must be ≥4 V above switch node voltage; powers HDrv stage; bypass with ≥1 µF capacitor to GND. |
| 7 - Comp | Error amplifier compensation node | External RC network here sets loop stability; critical for transient response and phase margin. |
| 8 - SS/SD | Soft-start / shutdown control | Internal 25 µA current source ramps voltage for controlled startup; pulled <0.5 V to force shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 400 kHz switching frequency | Enables consistent EMI filtering design and predictable inductor core loss vs. variable-frequency alternatives. |
| Latch-off short-circuit protection | Prevents thermal runaway by disabling PWM when Fb drops to 0.4 V - critical for DDR Vtt rail integrity. |
| Programmable soft-start via external capacitor | Eliminates input surge current and output overshoot; startup time precisely set by CSS value (e.g., 0.1 µF = 7.5 ms). |
| Dual UVLO with independent Vcc/Vc monitoring | Ensures safe operation only when both bias (Vcc ≥ 4.2 V) and high-side drive (Vc ≥ 3.3 V) supplies are valid. |
| 500 mA peak gate drive strength | Supports fast turn-on/turn-off of discrete N-channel MOSFETs without external drivers, reducing BOM count. |
Applications
| DDR Memory Vtt Regulation | Graphics Card Core Power |
|---|---|
|
Use Scenario: Providing tightly regulated ±1% 1.25 V Vtt termination voltage for DDR2/DDR3 memory interfaces with bidirectional current sourcing/sinking capability. IC Role / Device Role / Timing Role: Synchronous buck controller managing dual-N-MOSFET topology to maintain Vtt within JEDEC-specified ripple (<30 mV) during fast load transients. Use Value: Enables stable memory bus signaling at >800 MT/s by eliminating Vtt droop during read/write bursts, directly supported by 400 kHz bandwidth and latch-off fault response. |
Use Scenario: Generating 1.0–1.3 V GPU core supply from 5 V or 12 V intermediate rail in discrete graphics cards requiring rapid load-step response. IC Role / Device Role / Timing Role: Primary voltage-mode PWM controller coordinating high-side and low-side N-MOSFETs to deliver up to 5 A with <50 µs transient recovery. Use Value: Delivers 90%+ efficiency at full load while maintaining <100 mV output deviation during 0→4 A steps, enabled by 500 mA gate drive and 1.25 V reference accuracy. |
| Hard Disk Drive +5 V Regulator | Embedded System Point-of-Load |
|
Use Scenario: Converting 12 V ATX supply to clean, low-noise +5 V for HDD servo control and interface logic in consumer storage devices. IC Role / Device Role / Timing Role: Fixed-frequency synchronous buck controller minimizing conducted EMI into sensitive analog servo circuits via deterministic 400 kHz switching. Use Value: Reduces thermal stress versus linear regulators by cutting power loss from >3 W to <0.5 W at 2 A load, validated by 125°C max junction rating and TSSOP thermal pad. |
Use Scenario: On-board 3.3 V or 2.5 V generation for FPGA I/O banks or microcontroller peripherals in industrial PLC modules with limited board area. IC Role / Device Role / Timing Role: Compact, lead-free TSSOP-based controller enabling high-density layout with minimal external components (no integrated MOSFETs required). Use Value: Lowers system cost by 35% vs. integrated DC-DC modules while meeting IEC 61000-4-2 ESD immunity requirements via robust UVLO and latch-off protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRU3037CF | 200 kHz oscillator, 1.25 V reference, identical pinout and UVLO thresholds | Lower switching frequency increases inductor size but reduces switching losses at light load | Select when optimizing for efficiency below 1 A or where EMI constraints favor sub-300 kHz operation |
| TPS5430DDAR | 3.5 V–36 V input, integrated high-side FET, 3.5 A output, 500 kHz adjustable frequency | Self-contained solution eliminates external MOSFETs but lacks latch-off short-circuit protection | Choose for simplified design with higher current needs (>3 A), accepting trade-off in fault coverage and thermal management complexity |
Compared with IRU3037CF, the IRU3037ACF delivers faster transient response and smaller magnetics due to doubled frequency, while TPS5430DDAR trades discrete flexibility and robust latch-off protection for integration and wider VIN range - making IRU3037ACF optimal for cost-sensitive, high-reliability DDR Vtt and GPU point-of-load designs.
Availability
IRU3037ACF is available at Aetrix Electronics and suitable for DDR memory Vtt regulation, graphics card core power, and embedded system point-of-load applications requiring stable component supply across multi-year production cycles.
Supply support for IRU3037ACF 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 ICs, and industrial control solutions, with global manufacturing and quality certification to ISO 9001 and IATF 16949.
The IRU3037A series belongs to Infineon's legacy synchronous buck controller product line, engineered specifically for cost-effective, high-efficiency on-board DC-DC conversion in computing and storage applications demanding tight voltage regulation and robust fault protection.
FAQ
What is the minimum recommended soft-start capacitor value for IRU3037ACF?
The datasheet specifies a 25 µA internal current source for soft-start; a 0.1 µF ceramic capacitor yields ~7.5 ms startup time and is explicitly validated in the design example. Smaller values (e.g., 0.047 µF) reduce startup time but risk output overshoot if loop compensation isn't adjusted. Larger values increase startup duration without benefit unless inrush limiting is critical.
Can IRU3037ACF drive logic-level MOSFETs without level-shifting?
Yes - the 500 mA peak drive current and rail-to-rail output swing (0 V to Vc for HDrv, 0 V to Vcc for LDrv) fully support standard logic-level N-channel MOSFETs such as IRF7313 or IRF7301. No external level shifters are needed, provided Vc ≥ 4 V above the switch node voltage to ensure sufficient gate overdrive for the high-side device.
How does the latch-off under-voltage protection behave during a sustained short circuit?
When Fb falls to ≤0.4 V (IRU3037A specification), the PWM outputs are immediately disabled and held latched off until power cycling or a hard reset via Vcc/Vc resequencing. This prevents repeated restart attempts and thermal damage - unlike auto-retry controllers - making it suitable for safety-critical DDR Vtt rails where uncontrolled recovery could corrupt memory data.
Is the IRU3037ACF RoHS-compliant and halogen-free?
Yes - the "CF" suffix denotes the lead-free TSSOP package, and the "PbF" designation in official ordering information confirms compliance with RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. The device meets JEDEC J-STD-020D moisture sensitivity level 3 and is qualified for 260°C reflow.
IRU3037ACF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 400kHz
- 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-TSSOP
IRU3037ACF FAQ
1.How can I place an order for IRU3037ACF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRU3037ACF 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 IRU3037ACF reliable?
The price and inventory of IRU3037ACF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRU3037ACF is usually 5 days.
3.What payment methods are accepted for IRU3037ACF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRU3037ACF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRU3037ACF?
IRU3037ACF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRU3037ACF 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 IRU3037ACF?
For technical support, including IRU3037ACF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRU3037ACF requirements.
6.How does Aetrix verify that IRU3037ACF is sourced from the original manufacturer or authorized distributors?
All IRU3037ACF 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 IRU3037ACF meets industry standards.
7.What is the process for return or replacement of IRU3037ACF?
All IRU3037ACF units undergo pre-shipment inspection (PSI). If there is an issue with IRU3037ACF, 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 IRU3037ACF part is unused and in its original packaging.
Return procedure for IRU3037ACF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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