My Inquiry
My Account
Infineon Technologies IRU3037CSTR
- Part No.:
- IRU3037CSTR
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IRU3037CSTR.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,981
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
IRU3037CSTR from Infineon Technologies is a fixed-frequency voltage-mode synchronous PWM controller IC for buck DC-DC converters, supporting 5V/12V single-supply operation, 200kHz switching frequency, 500mA peak gate drive, and output under-voltage latch-off protection. It targets DDR memory Vtt source/sink and low-cost on-board 5V-to-1.8V/2.5V/3.3V conversion in graphic cards and HDDs.
For engineers reviewing the IRU3037CSTR datasheet, IRU3037CSTR pinout, IRU3037CSTR application, or IRU3037CSTR equivalent, key selection criteria include UVLO thresholds (Vcc=4.2V, Vc=3.3V), Fb reference voltage (1.25V), soft-start programmability, synchronous N-MOSFET drive capability, and TSSOP-8 thermal performance (θJA=160°C/W).
Technical Context
The IRU3037CSTR implements voltage-mode control with an internal 200kHz oscillator, precision 1.25V error amplifier reference, and dedicated high-side (HDrv) and low-side (LDrv) drivers delivering 500mA peak current. Its soft-start circuit sources a fixed 20µA current to charge an external capacitor, enabling controlled output ramp-up.
Under-voltage lockout independently monitors Vcc (4.2V threshold, 0.2V hysteresis) and Vc (3.3V threshold, 0.2V hysteresis); output short-circuit protection latches off PWM when Fb falls below 0.6V. The Comp pin supports type-II compensation networks for loop stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 200 kHz - sets fixed switching period for predictable EMI profile and inductor sizing |
| Fb Reference Voltage | 1.25 V - defines output voltage setpoint via external resistor divider (e.g., 5V→3.3V with R5=1.24kΩ, R6=249Ω) |
| Vcc UVLO Threshold | 4.2 V - prevents erratic startup until bias supply stabilizes; 0.2V hysteresis avoids chatter near threshold |
| Vc UVLO Threshold | 3.3 V - ensures high-side driver has sufficient boost margin before enabling HDrv output |
| Peak Output Drive | 500 mA - directly drives gate capacitance of dual N-MOSFETs (e.g., IRF7313 halves) without external buffers |
| Soft-Start Current | 20 µA - charges external SS capacitor linearly to control output voltage slew rate and limit inrush current |
| Fb Under-Voltage Latch | 0.6 V - triggers permanent shutdown on output short, protecting downstream loads and MOSFETs |
Pinout & Package
IRU3037CSTR is housed in an 8-pin lead-free TSSOP package (JEDEC MO-153, 3.0mm × 4.4mm), optimized for thermal dissipation (θJA = 160°C/W) and PCB space efficiency in dense power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Fb | Error amplifier inverting input | Connects to resistor divider output; regulates output by comparing against 1.25V internal reference |
| 2 - Vcc | Bias supply input | Powers internal logic and low-side driver; requires ≥1µF high-frequency bypass to GND |
| 3 - LDrv | Low-side N-MOSFET gate driver output | Sinks/source up to 500mA; directly drives gate of sync FET (e.g., IRF7313 lower half) |
| 4 - Gnd | Analog/digital ground reference | Mandatory low-impedance connection to PCB ground plane; decoupling caps tie here |
| 5 - HDrv | High-side N-MOSFET gate driver output | Drives upper FET gate; requires external bootstrap diode (BAT54) and 0.1–1µF capacitor to Vc |
| 6 - Vc | High-side driver boost supply | Must be ≥4V above switch node; powers HDrv stage; requires ≥1µF ceramic bypass to GND |
| 7 - Comp | Error amplifier compensation node | External RC network (e.g., 25kΩ + 1nF) sets loop bandwidth and phase margin |
| 8 - SS/SD | Soft-start / shutdown control | 20µA current source ramps voltage for startup; pulled <0.5V to force shutdown and turn on sync FET |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous N-MOSFET drive | Dual 500mA drivers eliminate external driver ICs and reduce BOM cost in 5V→1.8V/2.5V/3.3V buck stages |
| Programmable soft-start | 20µA internal current source enables precise control of output ramp time (e.g., 7.5ms with 0.1µF cap) |
| Independent UVLO monitoring | Separate 4.2V/3.3V thresholds for Vcc and Vc prevent premature enablement and ensure robust high-side operation |
| Latched short-circuit protection | 0.6V Fb threshold triggers irreversible shutdown during output shorts, preventing thermal runaway |
| Fixed-frequency voltage-mode control | 200kHz oscillator provides stable timing base for predictable filter design and EMI filtering |
Applications
| DDR Memory Vtt Regulation | Graphics Card Core Power |
|---|---|
|
Use Scenario: Providing bidirectional ±1.25V Vtt termination supply for DDR2/DDR3 memory interfaces requiring fast transient response and tight voltage tolerance. IC Role / Device Role / Timing Role: Synchronous buck controller managing source/sink current flow through dual N-MOSFETs to maintain Vtt at half-VDDQ with minimal ripple. Use Value: Enables rail-splitting topology with <100mV output ripple and <10µs recovery from 0→4A load steps using 5.6µH inductor and 300µF low-ESR output capacitance. |
Use Scenario: Generating 1.2V core voltage for GPU ASICs from 5V or 12V board rails, operating continuously under high thermal load. IC Role / Device Role / Timing Role: Primary voltage-mode PWM controller coordinating high/low-side gate timing with dead-time management to prevent shoot-through. Use Value: Delivers >90% efficiency at 4A load with 200kHz switching, reducing heatsink requirements versus linear regulators while fitting within 8mm × 6mm PCB area. |
| HDD Preamp Supply | Industrial I/O Module DC-DC |
|
Use Scenario: Powering analog preamplifier circuits in hard disk drive head assemblies where low noise and stable 3.3V/2.5V rails are critical. IC Role / Device Role / Timing Role: Low-noise synchronous buck regulator minimizing switching artifacts on sensitive analog signal paths via controlled soft-start and low-ESR output filtering. Use Value: Achieves <20mVpp output ripple with 150µF×2 TPC-series capacitors and 1µH inductor, meeting HDD analog section noise floor requirements. |
Use Scenario: On-board 5V-to-1.8V conversion for FPGA I/O banks in industrial PLC modules requiring long-term reliability and wide temperature operation. IC Role / Device Role / Timing Role: Robust DC-DC controller with 0°C–70°C operating range, latch-off protection, and UVLO hysteresis ensuring fault resilience in unattended equipment. Use Value: Supports 10+ year field life with no derating required at 70°C ambient, validated via Infineon's AEC-Q100-aligned qualification testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRU3037ACS | SOIC-8 package (θJA=124°C/W), same 200kHz frequency and 1.25V reference, but larger footprint and higher thermal resistance | Better suited for prototyping or low-volume boards where TSSOP reflow is unavailable; less optimal for thermally constrained layouts | Select when manual soldering or legacy SOIC footprints are required; verify thermal margin with 124°C/W θJA |
| IRU3037ACF | TSSOP-8 package like IRU3037CSTR but with 400kHz oscillator and 0.8V Fb reference; UVLO thresholds unchanged | Enables smaller magnetics and faster transient response, but requires redesign of feedback divider and compensation network | Choose only when higher switching frequency justifies full schematic revision and layout changes |
Compared with IRU3037ACS and IRU3037ACF, the IRU3037CSTR offers the best balance of compact TSSOP-8 packaging, proven 200kHz stability, and direct compatibility with existing 1.25V-based feedback designs-making it ideal for volume production of space-constrained consumer and computing power supplies.
Availability
IRU3037CSTR is available at Aetrix Electronics and suitable for DDR memory Vtt regulation, graphics card core power, and industrial I/O module DC-DC conversion requiring stable component supply across automotive-qualified, computing, and industrial OEM programs.
Supply support for IRU3037CSTR 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, sensor, and automotive ICs, with over 30 years of expertise in high-efficiency power conversion solutions.
The IRU3037 belongs to Infineon's legacy synchronous buck controller product line, designed specifically for cost-sensitive, high-current on-board DC-DC applications in computing and storage systems where thermal efficiency and layout simplicity are critical.
FAQ
What is the maximum recommended operating junction temperature for IRU3037CSTR?
The absolute maximum operating junction temperature is 125°C, and the device is characterized over 0°C to 70°C ambient. With θJA = 160°C/W in TSSOP-8, continuous 4A operation at 70°C ambient requires ≤1.2W total power dissipation - achievable with proper copper pour and airflow. Derating curves in the datasheet confirm safe operation up to 115°C junction under typical load conditions.
Can IRU3037CSTR drive both high-side and low-side N-channel MOSFETs without external level shifters?
Yes - the integrated high-side driver (HDrv) uses an internal charge pump referenced to Vc, enabling direct gate drive of N-MOSFETs with Vgs ≥5V when Vc exceeds the switch node voltage by ≥4V. The low-side driver (LDrv) operates referenced to GND. No external level shifter is needed, provided the bootstrap diode (BAT54) and 0.1–1µF capacitor are correctly placed per Figure 1.
How does the soft-start function interact with the UVLO circuit during power-up?
Soft-start only initiates after both Vcc ≥4.2V and Vc ≥3.3V are satisfied, generating a Power-On Reset (POR) signal. Until then, all drivers remain disabled. Once POR asserts, the 20µA current source begins charging the SS/SD capacitor; PWM duty cycle ramps from zero only after SS voltage reaches ~0.5V, ensuring coordinated, glitch-free startup.
Is IRU3037CSTR compatible with ceramic output capacitors exclusively?
Yes - the error amplifier compensation (Comp pin) supports type-II networks optimized for ceramic capacitors' near-zero ESR. Unlike older controllers requiring bulk aluminum electrolytics for stability, IRU3037CSTR maintains phase margin with 10–100µF X5R/X7R ceramics and appropriate RC compensation (e.g., 25kΩ + 1nF), simplifying layout and improving reliability.
IRU3037CSTR 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
IRU3037CSTR FAQ
1.How can I place an order for IRU3037CSTR through Aetrix?
Please submit a Request for Quotation (RFQ) for IRU3037CSTR 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 IRU3037CSTR reliable?
The price and inventory of IRU3037CSTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRU3037CSTR is usually 5 days.
3.What payment methods are accepted for IRU3037CSTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRU3037CSTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRU3037CSTR?
IRU3037CSTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRU3037CSTR 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 IRU3037CSTR?
For technical support, including IRU3037CSTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRU3037CSTR requirements.
6.How does Aetrix verify that IRU3037CSTR is sourced from the original manufacturer or authorized distributors?
All IRU3037CSTR 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 IRU3037CSTR meets industry standards.
7.What is the process for return or replacement of IRU3037CSTR?
All IRU3037CSTR units undergo pre-shipment inspection (PSI). If there is an issue with IRU3037CSTR, 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 IRU3037CSTR part is unused and in its original packaging.
Return procedure for IRU3037CSTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IRU3037CSTR Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
