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Infineon Technologies IRU3037ACFPBF
- Part No.:
- IRU3037ACFPBF
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
IRU3037ACFPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,068
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Product details
Overview
IRU3037ACFPBF from Infineon Technologies is a fixed-frequency, voltage-mode synchronous PWM controller IC for buck DC-DC converters, supporting 400 kHz switching, 500 mA peak gate drive, under-voltage lockout (Vcc: 4.2 V, Vc: 3.3 V), programmable soft-start, and output short-circuit latch-off protection. It targets DDR memory Vtt source/sink and low-voltage on-board conversion (e.g., 5V to 1.8V/2.5V) in graphic cards and HDDs.
For engineers reviewing the IRU3037ACFPBF datasheet, IRU3037ACFPBF pinout, IRU3037ACFPBF application, or IRU3037ACFPBF equivalent, key selection criteria include oscillator frequency (400 kHz), Fb reference voltage (0.800 V), UVLO thresholds, soft-start current (2 µA), and SOIC-8/TSSOP-8 package compatibility with dual N-channel MOSFETs like IRF7313.
Technical Context
The IRU3037ACFPBF implements a voltage-mode control architecture with an internal 400 kHz oscillator, precision 0.800 V feedback reference, and independent UVLO monitoring for both Vcc and Vc supplies. Its error amplifier features 64 µmho transconductance and compensation via external R-C network on the Comp pin.
It delivers 500 mA peak source/sink capability per driver (HDrv/LDrv), supports bootstrap high-side drive via external diode/capacitor, and integrates latch-off shutdown triggered by Fb falling below 0.4 V - confirming short-circuit detection and protection behavior distinct from the non-A variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 400 kHz - sets fixed switching period for stable loop design and EMI control in compact DC-DC layouts. |
| Fb Reference Voltage | 0.800 V - defines output voltage setpoint accuracy when used with external resistor divider (e.g., 1.8 V @ R5=1.24 kΩ, R6=249 Ω). |
| Vcc UVLO Threshold | 4.2 V - prevents operation until bias supply stabilizes, avoiding erratic startup in 5 V/12 V input systems. |
| Vc UVLO Threshold | 3.3 V - ensures high-side driver only enables when boost rail is sufficient for N-MOSFET gate overdrive. |
| Soft-Start Current | 2 µA - charges external capacitor linearly to control output ramp rate and limit inrush current during power-up. |
| Peak Output Drive | 500 mA - directly drives gates of discrete N-channel MOSFETs (e.g., IRF7313 halves) without external buffers. |
| Fb Short-Detect Threshold | 0.4 V - latches off PWM outputs upon sustained output short, enabling fail-safe shutdown in DDR Vtt rails. |
Pinout & Package
IRU3037ACFPBF is housed in an 8-pin lead-free TSSOP (F) package with exposed pad for thermal enhancement. Pin assignments are validated per Infineon's PD94173 revD datasheet and match mechanical footprint of industry-standard TSSOP-8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Fb | Error amplifier inverting input | Connects to resistor divider output; compares sensed Vout against 0.800 V reference to regulate duty cycle. |
| 2 - Vcc | Bias supply input | Powers internal logic and low-side driver; requires ≥1 µF HF decoupling to ground for stable operation. |
| 3 - LDrv | Low-side MOSFET gate driver output | Sinks/sources 500 mA to drive N-MOSFET source-connected switch; referenced to Gnd. |
| 4 - Gnd | Analog/digital ground reference | Mandatory low-impedance connection to PCB ground plane; decouples Vcc and Vc noise paths. |
| 5 - HDrv | High-side MOSFET gate driver output | Drives N-MOSFET drain-connected switch; requires external BAT54/1N4148 diode to Gnd for negative-current handling. |
| 6 - Vc | Bootstrap/high-side driver supply | Must exceed bus voltage by ≥4 V; requires ≥1 µF HF capacitor to Gnd for peak gate charge delivery. |
| 7 - Comp | Error amplifier compensation node | External RC network here sets loop stability; typical values: 25 kΩ + 1 nF for 200–400 kHz designs. |
| 8 - SS/SD | Soft-start input / shutdown control | Internal 2 µA current source ramps voltage for controlled startup; pulled <0.5 V to force shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 400 kHz oscillator | Enables predictable EMI profile and smaller passive sizing vs. 200 kHz variants (e.g., IRU3037CFPBF). |
| 0.4 V output short-detect threshold | Provides faster latch-off response than IRU3037 (0.6 V), improving reliability in DDR Vtt fault conditions. |
| Independent Vcc/Vc UVLO | Prevents partial operation: disables drivers only when both bias (Vcc ≥4.2 V) and boost (Vc ≥3.3 V) rails are valid. |
| Programmable soft-start | 2 µA internal current source allows precise ramp time control (e.g., 7.5 ms with 0.1 µF capacitor). |
| 500 mA peak gate drive | Directly interfaces with logic-level N-MOSFETs (e.g., IRF7313), eliminating need for external driver stages. |
Applications
| DDR Memory Vtt Regulation | Graphics Card Core Supply |
|---|---|
|
Use Scenario: Providing matched source/sink current to DDR2/DDR3 termination rail (Vtt) with tight ±1% tolerance. IC Role / Device Role / Timing Role: Synchronous buck controller regulating bidirectional current flow using dual N-MOSFETs and fast short-circuit latch-off. Use Value: Maintains Vtt at half-Vdd (e.g., 0.9 V for 1.8 V DDR) with <100 mV ripple and immediate shutdown on line short. |
Use Scenario: Converting 12 V PCIe slot power to 1.0–1.2 V GPU core voltage in discrete graphics cards. IC Role / Device Role / Timing Role: Fixed-frequency voltage-mode controller driving high-current N-MOSFET pairs with 400 kHz switching for dynamic load response. Use Value: Delivers >4 A output with <1.5% load regulation and soft-start limiting inrush during GPU initialization. |
| HDD Preamp Power | Industrial FPGA I/O Bank Supply |
|
Use Scenario: Generating 2.5 V or 3.3 V for hard disk drive read/write channel preamplifiers with low-noise operation. IC Role / Device Role / Timing Role: Low-cost synchronous buck controller with integrated UVLO and soft-start for reliable cold-start in storage subsystems. Use Value: Achieves <55 mΩ output impedance using parallel PosCap outputs, meeting 20 mVpp ripple requirement under 3 A transient load. |
Use Scenario: Powering configurable I/O banks on Xilinx/Intel FPGAs requiring 1.8 V or 2.5 V with programmable sequencing. IC Role / Device Role / Timing Role: Programmable soft-start controller enabling synchronized ramp-up across multiple rails via shared SS capacitor network. Use Value: Enables deterministic power-on timing across FPGA banks using single 0.1 µF SS capacitor tied to all controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRU3037CFPBF | 200 kHz oscillator; 0.6 V Fb short-detect threshold; same pinout and UVLO specs. | Lower switching frequency increases inductor size but reduces switching losses in <3 A applications. | Select when EMI constraints favor lower frequency or when legacy 200 kHz layout reuse is prioritized. |
| TPS51116PWR | Integrated MOSFET drivers + 5-bit VID interface; 300–600 kHz programmable frequency; no external Vc boost required. | Targets notebook CPU VRMs with dynamic voltage scaling; lacks latch-off short protection. | Choose for systems needing VID-based adaptive voltage and integrated power stage - not drop-in replacement. |
Compared with IRU3037CFPBF and TPS51116PWR, the IRU3037ACFPBF offers higher frequency for compact magnetics and tighter short-protection response, while retaining discrete MOSFET flexibility and cost advantage over fully integrated solutions.
Availability
IRU3037ACFPBF is available at Aetrix Electronics and suitable for DDR memory Vtt regulation, graphics card core supply, and industrial FPGA I/O bank supply requiring stable component supply across production lifecycles.
Supply support for IRU3037ACFPBF 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.
The IRU3037A series 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.
FAQ
What is the function of the Vc pin on IRU3037ACFPBF?
The Vc pin supplies power to the high-side gate driver and must be ≥4 V above the switch node voltage. It requires a minimum 1 µF high-frequency ceramic capacitor to ground to deliver peak gate charge current during switching transitions. This pin enables bootstrap operation for N-channel high-side MOSFETs without requiring a floating supply.
How does the soft-start function operate in IRU3037ACFPBF?
The IRU3037ACFPBF sources a precise 2 µA current from the SS/SD pin to charge an external capacitor, ramping its voltage linearly to ~3 V. This voltage controls the PWM comparator's reference, gradually increasing duty cycle from zero until the feedback loop assumes regulation. Pulling SS/SD below 0.5 V forces immediate shutdown.
Can IRU3037ACFPBF drive P-channel high-side MOSFETs?
No - the IRU3037ACFPBF is designed exclusively for dual N-channel configurations. Its HDrv output is a grounded-source driver requiring bootstrap or charge-pump voltage (via Vc) to turn on an N-MOSFET high-side switch. Driving P-channel devices would require inverted logic and different gate drive architecture not supported by this IC.
What is the significance of the 0.4 V Fb short-detect threshold?
The 0.4 V threshold triggers latch-off shutdown when output voltage collapses due to short circuit, providing faster fault response than the 0.6 V threshold in the non-A version. This improves system safety in DDR Vtt applications where rapid isolation of faulty termination rails prevents damage to memory ICs or controller outputs.
IRU3037ACFPBF 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
IRU3037ACFPBF FAQ
1.How can I place an order for IRU3037ACFPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRU3037ACFPBF 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 IRU3037ACFPBF reliable?
The price and inventory of IRU3037ACFPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRU3037ACFPBF is usually 5 days.
3.What payment methods are accepted for IRU3037ACFPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRU3037ACFPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRU3037ACFPBF?
IRU3037ACFPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRU3037ACFPBF 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 IRU3037ACFPBF?
For technical support, including IRU3037ACFPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRU3037ACFPBF requirements.
6.How does Aetrix verify that IRU3037ACFPBF is sourced from the original manufacturer or authorized distributors?
All IRU3037ACFPBF 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 IRU3037ACFPBF meets industry standards.
7.What is the process for return or replacement of IRU3037ACFPBF?
All IRU3037ACFPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRU3037ACFPBF, 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 IRU3037ACFPBF part is unused and in its original packaging.
Return procedure for IRU3037ACFPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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