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Infineon Technologies IRU3037CFTR
- Part No.:
- IRU3037CFTR
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
IRU3037CFTR.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,815
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Product details
Overview
IRU3037CFTR from Infineon Technologies is a fixed-frequency, voltage-mode synchronous PWM controller for buck DC-DC converters, supporting 5V/12V input and delivering regulated output down to 1.8V at >3A. It integrates a 200kHz oscillator, 500mA peak gate drivers (high-side and low-side), under-voltage lockout on Vcc (4.2V threshold) and Vc (3.3V threshold), programmable soft-start, and output undervoltage latch-off at 0.6V - deployed in DDR memory Vtt source/sink and graphics card power rails.
For engineers reviewing the IRU3037CFTR datasheet, IRU3037CFTR pinout, IRU3037CFTR application, or IRU3037CFTR equivalent, key selection considerations include its TSSOP-8 package, 200kHz switching frequency, Fb reference voltage of 1.25V ±2.5%, UVLO hysteresis (0.2V on Vcc/Vc), and dual N-MOSFET drive capability with dead-time control.
Technical Context
The IRU3037CFTR implements voltage-mode PWM control using an internal 200kHz sawtooth oscillator and error amplifier with 1.25V precision reference. Its feedback loop compares the resistor-divider-sensed output voltage at the Fb pin against this reference to generate duty-cycle-modulated gate signals.
It features independent UVLO circuits for Vcc (4.2V turn-on, 4.0V turn-off) and Vc (3.3V turn-on, 3.1V turn-off), plus output short-circuit protection that latches off when Fb falls below 0.6V. The SS/SD pin enables both programmable soft-start (via external capacitor) and active shutdown (pull <0.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 200 kHz - sets fixed switching period for stable loop design and EMI control in board-level DC-DC converters. |
| Fb Reference Voltage | 1.25 V ±2.5% - defines output regulation setpoint via external resistor divider; determines accuracy of 1.8V/2.5V/3.3V outputs. |
| Vcc UVLO Threshold | 4.2 V (turn-on), 4.0 V (turn-off) - prevents erratic operation during brown-out; ensures clean startup only after stable 5V bias rail is established. |
| Vc UVLO Threshold | 3.3 V (turn-on), 3.1 V (turn-off) - safeguards high-side driver activation until boost supply reaches safe level for N-MOSFET gate overdrive. |
| Peak Output Drive | 500 mA per driver - sufficient to rapidly charge/discharge gate capacitance of dual N-channel MOSFETs like IRF7313 in <100 ns rise/fall times. |
| Output Short Protection | Latches off at Fb ≤ 0.6 V - detects output collapse due to short or overload and holds PWM disabled until power cycle or SS/SD reset. |
| Soft-Start Current | 75 µA - charges external SS capacitor linearly to ramp output voltage, limiting inrush current and preventing overshoot at startup. |
Pinout & Package
IRU3037CFTR is housed in an 8-pin lead-free TSSOP (Thin Shrink Small Outline Package) with exposed thermal pad, optimized for compact board layout and thermal dissipation in high-density power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Fb | Error amplifier inverting input | Connects to resistor divider from output; regulates voltage by comparing sensed value to 1.25V internal reference. |
| 2 - Vcc | Bias supply input | Powers internal logic and low-side driver; requires ≥1µF ceramic bypass to GND for transient current delivery. |
| 3 - LDrv | Low-side N-MOSFET gate driver output | Sinks/source up to 500mA; drives gate of synchronous rectifier (e.g., IRF7313 lower half) with controlled slew rate. |
| 4 - Gnd | Analog/digital ground reference | Mandatory low-impedance connection to PCB ground plane; decoupling caps for Vcc and Vc must tie here. |
| 5 - HDrv | High-side N-MOSFET gate driver output | Drives upper switch gate; requires external bootstrap diode (BAT54) and capacitor for floating high-side operation. |
| 6 - Vc | High-side driver supply input | Must be ≥4V above output bus; powers HDrv stage; bypass with ≥1µF ceramic cap to GND for peak current support. |
| 7 - Comp | Error amplifier compensation node | External RC network (R+C to GND) sets loop stability poles/zeros; critical for phase margin in closed-loop response. |
| 8 - SS/SD | Soft-start / shutdown control | Internal 75µA current source charges external cap for soft-start; pulled <0.5V to force immediate shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-frequency voltage-mode control | 200kHz oscillator enables predictable EMI profile and simplified filter design without variable-frequency jitter. |
| Dual 500mA N-MOSFET gate drivers | Eliminates need for external driver ICs; supports fast-switching discrete FETs (e.g., IRF7313) with matched timing. |
| Programmable soft-start with latch-off | 75µA internal current source + external capacitor allows precise startup ramp time (e.g., 7.5ms with 0.1µF). |
| Independent Vcc and Vc UVLO | Prevents partial operation: Vcc UVLO (4.2V/4.0V) guards logic; Vc UVLO (3.3V/3.1V) ensures safe high-side drive. |
| Output undervoltage fault latching | Shuts down permanently if Fb ≤ 0.6V - protects downstream loads and power stage during sustained short-circuit events. |
Applications
| DDR Memory Vtt Regulation | Graphics Card Core Power |
|---|---|
|
Use Scenario: Providing tightly regulated, bidirectional Vtt termination voltage (±1.25V) for DDR2/DDR3 memory interfaces. IC Role / Device Role / Timing Role: Synchronous buck controller managing source/sink current flow to match memory bus signaling requirements. Use Value: Enables accurate Vtt tracking within ±25mV via 1.25V reference and fast transient response, meeting JEDEC DDR timing specs. |
Use Scenario: Generating stable 1.8V or 2.5V core supply for GPU ASICs in discrete graphics cards with dynamic load steps up to 4A. IC Role / Device Role / Timing Role: Primary voltage-mode PWM controller coordinating dual N-MOSFETs to maintain regulation under 10A/µs load transients. Use Value: Delivers <100mV output ripple and <50µs recovery via programmable soft-start and latch-off protection during fault conditions. |
| Hard Disk Drive +12V-to-+5V Conversion | Embedded System Point-of-Load (POL) |
|
Use Scenario: Converting 12V intermediate bus to 5V/3.3V rails for HDD servo controllers and interface logic in enterprise storage systems. IC Role / Device Role / Timing Role: Cost-optimized synchronous buck controller replacing linear regulators to achieve >85% efficiency at 3A load. Use Value: Reduces thermal load by >70% vs. linear solution; UVLO sequencing ensures clean power-up across multiple voltage domains. |
Use Scenario: On-board DC-DC conversion for FPGA I/O banks or microcontroller cores requiring 1.8V/2.5V from 5V system rail in industrial PLCs. IC Role / Device Role / Timing Role: Fixed-frequency PWM controller enabling compact, low-noise POL design with minimal external components. Use Value: Achieves <1% output voltage deviation across temperature (-40°C to +85°C) using precision 1.25V reference and external 1% resistors. |
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, same 200kHz frequency and 1.25V reference, but higher θJA (124°C/W vs. 160°C/W for TSSOP) | Better suited for through-hole assembly or legacy PCB footprints; slightly lower thermal performance in dense layouts | Select when SOIC compatibility or manual soldering is required; verify thermal margin with 124°C/W junction-to-ambient rating |
| IRU3037ACF | Same TSSOP-8 package but 400kHz oscillator (vs. 200kHz); Fb reference 0.8V (vs. 1.25V); UVLO Fb threshold 0.4V (vs. 0.6V) | Enables smaller magnetics and faster transient response; targets newer low-voltage ASICs requiring tighter regulation at <1.2V | Choose for designs needing higher switching frequency and sub-1.2V output; re-evaluate loop compensation and Fb divider ratio |
Compared with IRU3037ACS and IRU3037ACF, the IRU3037CFTR offers optimal thermal performance in space-constrained TSSOP layout while maintaining 200kHz timing stability and 1.25V reference compatibility with legacy DDR Vtt designs - making it ideal for cost-sensitive, thermally demanding board-level converters.
Availability
IRU3037CFTR is available at Aetrix Electronics and suitable for DDR memory Vtt regulation, graphics card core power, and embedded system point-of-load (POL) applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for IRU3037CFTR 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 IRU3037 series belongs to Infineon's dedicated synchronous buck controller product line, engineered specifically for cost-sensitive, high-current on-board DC-DC conversion in computing and storage platforms where thermal density and reliability are critical.
FAQ
What is the maximum recommended operating junction temperature for IRU3037CFTR?
The absolute maximum operating junction temperature is 125°C, and the device is characterized over 0°C to 70°C ambient. Thermal design must ensure θJA ≤ 160°C/W with proper PCB copper area and via stitching to the exposed pad to avoid exceeding 125°C junction under full 500mA drive load and 200kHz switching.
Can IRU3037CFTR drive both high-side and low-side N-channel MOSFETs without external level-shifting circuitry?
Yes - IRU3037CFTR integrates dedicated high-side and low-side gate drivers. The HDrv pin uses an internal charge pump (enabled by external bootstrap diode and capacitor) to generate gate voltage ≥4V above the switch node, eliminating need for external level shifters when driving N-MOSFETs in synchronous buck topology.
How does the SS/SD pin function during normal operation versus fault condition?
During normal startup, the SS/SD pin sources 75µA to charge an external capacitor, ramping the PWM duty cycle linearly. During fault (e.g., output short), pulling SS/SD <0.5V forces immediate shutdown - turning off HDrv, turning on LDrv, and holding the state until power cycle or SS/SD release.
Is the 1.25V Fb reference internally trimmed, and what is its temperature drift specification?
Yes - the 1.25V reference is factory-trimmed and specified over 0°C to 70°C ambient with ±2.5% total tolerance (including initial accuracy, line/load regulation, and temperature drift). Typical drift is <50 ppm/°C, contributing <±10mV variation across the full operating range.
IRU3037CFTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
IRU3037CFTR FAQ
1.How can I place an order for IRU3037CFTR through Aetrix?
Please submit a Request for Quotation (RFQ) for IRU3037CFTR 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 IRU3037CFTR reliable?
The price and inventory of IRU3037CFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRU3037CFTR is usually 5 days.
3.What payment methods are accepted for IRU3037CFTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRU3037CFTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRU3037CFTR?
IRU3037CFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRU3037CFTR 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 IRU3037CFTR?
For technical support, including IRU3037CFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRU3037CFTR requirements.
6.How does Aetrix verify that IRU3037CFTR is sourced from the original manufacturer or authorized distributors?
All IRU3037CFTR 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 IRU3037CFTR meets industry standards.
7.What is the process for return or replacement of IRU3037CFTR?
All IRU3037CFTR units undergo pre-shipment inspection (PSI). If there is an issue with IRU3037CFTR, 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 IRU3037CFTR part is unused and in its original packaging.
Return procedure for IRU3037CFTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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