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Infineon Technologies IRU3037CS
- Part No.:
- IRU3037CS
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IRU3037CS.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,058
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Product details
Overview
IRU3037CS from Infineon Technologies is a fixed-frequency voltage-mode synchronous PWM controller for buck DC-DC conversion, operating from single 5V or 12V supply, featuring 200kHz internal oscillator, 500mA peak gate drive, under-voltage lockout (Vcc=4.2V, Vc=3.3V), and latch-off short-circuit protection at Fb < 0.6V - deployed in DDR memory Vtt source/sink rails and low-cost 5V-to-1.8V/2.5V/3.3V on-board converters.
For engineers reviewing the IRU3037CS datasheet, IRU3037CS pinout, IRU3037CS application, or IRU3037CS equivalent, key selection criteria include oscillator frequency matching, UVLO thresholds, soft-start programmability, Fb reference voltage (1.25V), and SOIC-8 package compatibility with discrete N-channel MOSFET pairs like IRF7313.
Technical Context
The IRU3037CS implements voltage-mode PWM control using a precision 1.25V internal reference and error amplifier with transconductance of 600µmho, comparing feedback against a linear sawtooth ramp generated by a 200kHz on-chip oscillator. It delivers fixed-frequency operation without external timing components.
Protection logic includes independent UVLO on Vcc (4.2V threshold, 0.2V hysteresis) and Vc (3.3V threshold, 0.2V hysteresis), output undervoltage latching at Fb < 0.6V, and shutdown via SS/SD pin pull-down below 0.5V - enabling robust start-up and fault recovery in high-current digital power rails.
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., 3.3V = 1.25V × (1 + R6/R5)). |
| Vcc UVLO Threshold | 4.2 V - prevents operation until bias rail stabilizes, avoiding erratic gate drive during power ramp. |
| Vc UVLO Threshold | 3.3 V - ensures high-side driver supply meets minimum boost requirement before enabling HDrv. |
| Peak Output Drive | 500 mA - sufficient to charge/discharge gate capacitance of dual N-MOSFETs (e.g., IRF7313) within dead-time constraints. |
| Short-Circuit Response | Latches off at Fb < 0.6 V - protects load and MOSFETs during sustained output shorts without auto-retry. |
| Soft-Start Current | 20 µA - charges external capacitor to ramp output voltage linearly, limiting inrush current during startup. |
Pinout & Package
IRU3037CS is housed in an 8-pin plastic SOIC NB (Small Outline Integrated Circuit, Narrow Body) package with standard 1.27 mm pitch and exposed pad not present - suitable for reflow assembly and thermal management up to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Fb | Error amplifier inverting input | Connects to resistor divider from output; regulates voltage by comparing to 1.25V internal reference. |
| Vcc | Bias supply input | Powers internal logic and low-side driver; requires ≥1µF high-frequency decoupling to ground. |
| LDrv | Low-side MOSFET gate driver output | Sinks/source up to 500mA to drive N-channel sync FET gate; referenced to Gnd. |
| Gnd | Analog/digital ground reference | Mandatory low-impedance connection to PCB ground plane; decouples Vcc and Vc supplies. |
| HDrv | High-side MOSFET gate driver output | Drives N-channel control FET gate; requires external bootstrap diode (e.g., BAT54) and capacitor. |
| Vc | High-side driver supply input | Must exceed switch node voltage by ≥4V; requires ≥1µF high-frequency decoupling to Gnd. |
| Comp | Error amplifier compensation node | External RC network sets loop stability; connects between Comp and Gnd per design requirements. |
| SS/SD | Soft-start / shutdown control | Internal 20µA current source ramps voltage for controlled startup; pulled <0.5V to force shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-frequency voltage-mode control | Eliminates need for external timing components while ensuring stable loop response across line/load variations. |
| Programmable soft-start | 20µA internal current source enables precise ramp time control via external capacitor (e.g., 0.1µF → 7.5ms). |
| Dual UVLO protection | Independent monitoring of Vcc (4.2V) and Vc (3.3V) prevents operation until both supplies meet minimum thresholds. |
| Latched short-circuit protection | Shuts down PWM and holds off until reset via power cycle or SS/SD pin release - avoids thermal runaway. |
| 500mA peak gate drive | Supports fast turn-on/turn-off of discrete N-MOSFETs with typical Qg < 20nC, reducing conduction losses in high-current rails. |
Applications
| DDR Memory Vtt Rail | Graphics Card Core Supply |
|---|---|
Use Scenario: Providing matched source/sink current for DDR2/DDR3 termination voltage (Vtt) in memory subsystems. IC Role / Device Role / Timing Role: Synchronous buck controller regulating Vtt at 0.9V–1.25V with fast transient response to memory bus activity. Use Value: Enables precise Vtt tracking within ±1% via 1.25V reference and low-drift feedback resistors, critical for signal integrity. | Use Scenario: Generating stable 1.2V–1.5V core voltage for GPU ASICs requiring >4A continuous current and tight regulation. IC Role / Device Role / Timing Role: Primary DC-DC controller managing high-efficiency buck conversion from 5V/12V input with 200kHz fixed frequency. Use Value: Delivers 500mA gate drive to drive IRF7313 dual MOSFETs, minimizing switching losses and maintaining <100mV output ripple. |
| Hard Disk Drive Logic Supply | Embedded System I/O Rail |
Use Scenario: Powering 3.3V or 2.5V logic circuitry in HDD controller boards where space and cost are constrained. IC Role / Device Role / Timing Role: Low-cost synchronous buck controller replacing linear regulators to improve efficiency from 5V input. Use Value: Achieves >85% efficiency at 3A load with SOIC-8 footprint, reducing thermal load and eliminating heatsink requirements. | Use Scenario: Generating 1.8V auxiliary supply for FPGA I/O banks or microcontroller peripherals in industrial control modules. IC Role / Device Role / Timing Role: Fixed-frequency PWM controller supporting programmable soft-start and latch-off fault handling. Use Value: Ensures clean power-up sequencing and reliable short-circuit recovery without system-level intervention. |
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 | 400kHz oscillator frequency; 0.8V Fb reference; 0.4V short-detect threshold | Higher switching frequency enables smaller magnetics but increases switching loss at high current | Select when board space is limited and thermal budget allows higher fSW operation |
| TPS5430DDAR | Integrated high/low-side MOSFETs; 3.5V–36V input; adjustable frequency 100kHz–2.5MHz | Monolithic solution eliminates external FET layout complexity but lacks SOIC-8 pinout compatibility | Select when design prioritizes integration over discrete FET flexibility and board-level tuning |
Compared with IRU3037ACS and TPS5430DDAR, the IRU3037CS offers optimal balance of discrete FET control, SOIC-8 layout familiarity, and 200kHz operation for thermally constrained 3–5A applications - making it preferred for cost-sensitive, high-volume DDR and graphics power designs where external MOSFET optimization is required.
Availability
IRU3037CS is available at Aetrix Electronics and suitable for DDR memory Vtt rails, graphics card core supplies, and embedded I/O power rails requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for IRU3037CS 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 headquarters in Munich, Germany.
The IRU3037 series belongs to Infineon's legacy analog power controller product line, designed specifically for cost-optimized, discrete-FET-based synchronous buck regulation in computing and storage applications.
FAQ
What is the function of the SS/SD pin on the IRU3037CS?
The SS/SD pin serves dual purpose: as a soft-start control node, it accepts an internal 20µA current source that charges an external capacitor to ramp output voltage linearly; as a shutdown input, pulling it below 0.5V forces immediate PWM disable and activates synchronous FET conduction to discharge output. No external pull-up is required.
Can the IRU3037CS operate with only a 3.3V input supply?
No - the IRU3037CS requires minimum Vcc = 4.2V to exit UVLO, and Vc must be ≥3.3V plus ≥4V headroom above the switch node voltage. With 3.3V input, Vc cannot meet the ≥7.3V requirement for high-side gate drive, making it unsuitable for direct 3.3V-to-lower-Vout conversion without external boost.
How does the IRU3037CS protect against high-side MOSFET short-circuit failure?
When the control (high-side) MOSFET fails shorted, the output voltage rises uncontrollably. The IRU3037CS detects this via Fb pin voltage exceeding the reference, then forces maximum duty cycle on LDrv to fully turn on the synchronous (low-side) FET - clamping output voltage near ground and limiting power dissipation in the shorted device.
What is the recommended capacitor type and value for the Comp pin?
A series RC network is required from Comp to Gnd for loop compensation. Typical values are 2.2kΩ resistor and 1nF ceramic capacitor, selected based on output capacitor ESR and inductor value to achieve phase margin >45°. Avoid electrolytic or tantalum capacitors due to poor high-frequency response and aging effects.
IRU3037CS 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-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
IRU3037CS FAQ
1.How can I place an order for IRU3037CS through Aetrix?
Please submit a Request for Quotation (RFQ) for IRU3037CS 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 IRU3037CS reliable?
The price and inventory of IRU3037CS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRU3037CS is usually 5 days.
3.What payment methods are accepted for IRU3037CS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRU3037CS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRU3037CS?
IRU3037CS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRU3037CS 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 IRU3037CS?
For technical support, including IRU3037CS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRU3037CS requirements.
6.How does Aetrix verify that IRU3037CS is sourced from the original manufacturer or authorized distributors?
All IRU3037CS 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 IRU3037CS meets industry standards.
7.What is the process for return or replacement of IRU3037CS?
All IRU3037CS units undergo pre-shipment inspection (PSI). If there is an issue with IRU3037CS, 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 IRU3037CS part is unused and in its original packaging.
Return procedure for IRU3037CS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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