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Infineon Technologies IRU3037CF
- Part No.:
- IRU3037CF
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
IRU3037CF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,323
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Product details
Overview
IRU3037CF from Infineon Technologies is a fixed-frequency, voltage-mode synchronous PWM controller for buck DC-DC converters, operating from a single 5V or 12V supply with internal 200kHz oscillator, 500mA peak gate drive, and integrated UVLO for Vcc (4.2V) and Vc (3.3V). It supports DDR memory Vtt source/sink applications and enables low-cost 5V-to-1.8V/2.5V/3.3V conversion with external dual N-channel MOSFETs such as IRF7313.
For engineers reviewing the IRU3037CF datasheet, IRU3037CF pinout, IRU3037CF application, or IRU3037CF equivalent, key selection considerations include its TSSOP-8 package, 200kHz switching frequency, soft-start programmability via external capacitor, latch-off under-voltage protection at Fb < 0.6V, and compatibility with logic-level N-MOSFETs in high-efficiency synchronous buck topologies.
Technical Context
The IRU3037CF implements voltage-mode control using a precision 1.25V reference and error amplifier with transconductance of 600µmho, comparing feedback against a linear sawtooth ramp generated by an on-chip oscillator. Its architecture includes independent UVLO circuits for Vcc and Vc supplies, ensuring safe startup only when both bias rails exceed their thresholds (4.2V and 3.3V).
It delivers 500mA peak current to both high-side and low-side gate drivers with 90ns rise/fall times and programmable dead time, enabling efficient driving of external N-MOSFETs. The SS/SD pin provides both soft-start ramp-up (via internal 25µA current source) and shutdown capability (triggered below 0.5V), while Fb under-voltage latching protects against output shorts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 200 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., 5V→3.3V with R5=1.24kΩ, R6=249Ω). |
| Vcc UVLO Threshold | 4.2 V - prevents operation until main bias rail stabilizes, avoiding erratic gate drive during power-up. |
| Vc UVLO Threshold | 3.3 V - ensures boost rail for high-side driver is valid before enabling synchronous rectification. |
| Fb UVLO Latch Threshold | 0.6 V - triggers permanent shutdown on output short, protecting downstream loads and MOSFETs. |
| Peak Output Drive | 500 mA - sufficient to rapidly charge/discharge gate capacitance of MOSFETs like IRF7313 in <100ns. |
| Soft-Start Current | 25 µA - charges external capacitor to ~3V, controlling output ramp rate (e.g., 0.1µF → 7.5ms start time). |
Pinout & Package
IRU3037CF is housed in an 8-pin plastic TSSOP (Thin Shrink Small Outline Package) with exposed pad for thermal enhancement and standard JEDEC MO-153 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Fb (Pin 1) | Error amplifier inverting input | Connects to resistor divider from output; 1.25V reference sets regulated voltage; latches off if voltage drops below 0.6V. |
| Vcc (Pin 2) | Bias supply for internal logic & low-side driver | Requires ≥1µF high-frequency decoupling to ground; UVLO activates below 4.2V. |
| LDrv (Pin 3) | Low-side N-MOSFET gate driver output | 500mA sink/source capability; drives bottom FET in synchronous buck; fast 90ns edges minimize conduction loss. |
| Gnd (Pin 4) | Power and signal reference plane | Mandatory low-impedance connection to PCB ground plane; decoupling caps (0.1–1µF) must tie here from Vcc/Vc. |
| HDrv (Pin 5) | High-side N-MOSFET gate driver output | Drives top FET; requires external bootstrap diode (e.g., BAT54) and capacitor; rated for 30V max Vc. |
| Vc (Pin 6) | Boost supply for high-side driver | Must be ≥4V above switch node voltage; UVLO activates below 3.3V; needs ≥1µF ceramic decoupling. |
| Comp (Pin 7) | Error amplifier compensation node | External RC network (e.g., 10kΩ + 1nF) stabilizes control loop; directly affects transient response and phase margin. |
| SS/SD (Pin 8) | Soft-start timing & shutdown control | Internal 25µA current source ramps voltage; pulling below 0.5V forces immediate shutdown and sync-FET turn-on. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-frequency voltage-mode control | 200kHz oscillator eliminates external timing components and ensures consistent loop bandwidth and EMI behavior. |
| Independent dual-rail UVLO | Separate 4.2V (Vcc) and 3.3V (Vc) lockout thresholds prevent partial operation and ensure coordinated startup of both drivers. |
| Programmable soft-start with shutdown | Single external capacitor sets ramp time; same pin doubles as shutdown input (<0.5V), simplifying system-level power sequencing. |
| Latched output short protection | Fb voltage drop below 0.6V disables PWM and holds state until power cycle, preventing thermal runaway during fault conditions. |
| 500mA dual gate drivers | Capable of driving IRF7313's total gate charge (Qg ≈ 20nC) in <40ns, minimizing switching losses in high-current buck stages. |
Applications
| DDR Memory Vtt Regulation | Graphics Card Core Supply |
|---|---|
Use Scenario: Providing matched termination voltage (Vtt) for DDR SDRAM interfaces requiring precise ±1% regulation at 0.9V–1.25V with bidirectional current sourcing/sinking. IC Role / Device Role / Timing Role: Synchronous buck controller managing dual-N-MOSFET stage to maintain Vtt within 10mV of Vddq/2 while responding to dynamic bus activity. Use Value: Enables stable memory signaling at >1600 MT/s by eliminating droop during heavy read/write bursts via fast load-transient response (<10µs recovery). | Use Scenario: Generating GPU core voltage (e.g., 1.05V @ 4A) from 5V or 12V rail in discrete graphics cards where space and thermal density constrain solution size. IC Role / Device Role / Timing Role: Primary voltage-mode PWM controller coordinating high/low-side gate timing, soft-start, and overcurrent protection in compact multi-phase-capable layout. Use Value: Delivers >92% efficiency at full load using low-RDS(ON) MOSFETs and minimizes board area via TSSOP-8 footprint and minimal external component count. |
| Hard Disk Drive Power Management | Industrial Embedded 5V-to-1.8V Conversion |
Use Scenario: Supplying regulated 1.8V/2.5V for HDD controller ASICs and servo processors from noisy 5V or 12V intermediate bus with strict ripple limits (<20mVpp). IC Role / Device Role / Timing Role: Fixed-frequency synchronous buck controller delivering clean, low-noise output with integrated ESR-sensitive output capacitor support. Use Value: Meets HDD qualification requirements for startup reliability (UVLO hysteresis prevents brownout oscillation) and long-term stability (125°C junction rating). | Use Scenario: On-board DC-DC conversion in industrial PLC I/O modules needing robust 5V-to-1.8V supply for ARM Cortex-M7 microcontrollers and ADCs. IC Role / Device Role / Timing Role: Cost-optimized voltage-mode controller supporting wide input range (5–12V), programmable soft-start, and latch-off fault handling in harsh environments. Use Value: Reduces BOM cost by 30% vs. integrated DC-DC modules while maintaining -40°C to +85°C operational range and 10-year lifecycle availability. |
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, identical 200kHz frequency and electrical specs; higher θJA (160°C/W vs. 124°C/W for TSSOP). | Preferred for through-hole assembly or legacy SOIC footprints; less suitable for high-density layouts requiring TSSOP thermal performance. | Select when board assembly process mandates SOIC or when thermal margin exceeds 15°C above ambient. |
| MP2208DJ-LF-Z | Monolithic 3A buck converter (integrated MOSFETs); 500kHz switching; no external FETs required; different pinout and control architecture. | Used where board space is critical and current ≤3A; lacks programmable soft-start and latch-off protection of IRU3037CF. | Choose for simplified design with lower part count, but avoid when >3A output or fault-latching protection is mandatory. |
Compared with IRU3037ACS and MP2208DJ-LF-Z, the IRU3037CF offers superior thermal performance in TSSOP-8, full latch-off short-circuit protection, and flexible external MOSFET selection-making it optimal for high-reliability, medium-current synchronous buck designs where layout density and fault safety are prioritized.
Availability
IRU3037CF is available at Aetrix Electronics and suitable for DDR memory Vtt regulation, graphics card core supply, and industrial embedded 5V-to-1.8V conversion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for IRU3037CF 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 decades of expertise in high-efficiency DC-DC conversion solutions.
The IRU3037CF belongs to Infineon's legacy synchronous buck controller product line, designed specifically for cost-sensitive, high-volume on-board DC-DC applications demanding reliable 200kHz fixed-frequency operation and robust fault protection.
FAQ
What is the maximum allowable Vc voltage for IRU3037CF?
The absolute maximum Vc supply voltage is 30V, but this rating applies only for non-inductive loads. In typical synchronous buck operation, Vc must be at least 4V higher than the switch-node voltage (e.g., 9V for a 5V output) and is commonly derived from a bootstrap circuit charged to ~2×Vout. Exceeding 12V on Vc without verifying MOSFET gate oxide integrity is not recommended.
Can IRU3037CF drive high-side and low-side MOSFETs simultaneously?
No - IRU3037CF uses complementary non-overlapping drive logic to prevent shoot-through: when HDrv is active, LDrv is forced low, and vice versa. Dead time is internally managed (~150ns minimum), and the SS/SD pin must be used to coordinate startup/shutdown sequencing between both FETs to ensure safe turn-on transitions.
How does the Fb under-voltage latch differ from standard UVLO?
The Fb latch is a fault-protection mechanism triggered when feedback voltage falls below 0.6V (indicating output short or severe overload), causing irreversible shutdown until power is cycled. In contrast, Vcc/Vc UVLO is a startup-enabling feature that releases the IC only after both supplies exceed their thresholds (4.2V and 3.3V) and remain above hysteresis levels (0.2V).
Is IRU3037CF compatible with lead-free reflow profiles?
Yes - IRU3037CF is offered in PbF (lead-free) version (IRU3037CFPbF) and qualified for standard JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C. The TSSOP-8 package uses matte tin plating and meets IPC/JEDEC moisture sensitivity level MSL3, requiring bake-out only if exposed >168 hours at >60% RH.
IRU3037CF 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:
- 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-TSSOP
IRU3037CF FAQ
1.How can I place an order for IRU3037CF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRU3037CF 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 IRU3037CF reliable?
The price and inventory of IRU3037CF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRU3037CF is usually 5 days.
3.What payment methods are accepted for IRU3037CF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRU3037CF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRU3037CF?
IRU3037CF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRU3037CF 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 IRU3037CF?
For technical support, including IRU3037CF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRU3037CF requirements.
6.How does Aetrix verify that IRU3037CF is sourced from the original manufacturer or authorized distributors?
All IRU3037CF 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 IRU3037CF meets industry standards.
7.What is the process for return or replacement of IRU3037CF?
All IRU3037CF units undergo pre-shipment inspection (PSI). If there is an issue with IRU3037CF, 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 IRU3037CF part is unused and in its original packaging.
Return procedure for IRU3037CF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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