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Microchip Technology MIC4576-3.3WU-TR
- Part No.:
- MIC4576-3.3WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4576-3.3WU-TR.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,013
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Product details
Overview
MIC4576-3.3WU-TR from Microchip Technology is a fixed-output 3.3V, 200 kHz step-down (buck) switching regulator in a 5-lead TO-263 (DDPAK) package, delivering up to 3A output current with ±3% output voltage accuracy across 6V–36V input and industrial temperature range (–40°C to +85°C), used in Intel Pentium™-class microprocessor power supplies.
For engineers reviewing the MIC4576-3.3WU-TR datasheet, MIC4576-3.3WU-TR pinout, MIC4576-3.3WU-TR application, or MIC4576-3.3WU-TR equivalent, key selection criteria include guaranteed 3A switch current, 200 kHz fixed-frequency operation enabling compact filter design, thermal shutdown and cycle-by-cycle overcurrent protection, and compatibility with standard inductors at reduced size versus LM2576.
Technical Context
The MIC4576-3.3WU-TR integrates a BiCMOS NPN power switch, 1.23V bandgap reference, error amplifier, and 200 kHz oscillator to implement voltage-mode PWM control. Its fixed 3.3V output is achieved via internal feedback divider, eliminating external resistors.
It operates across 4V–36V input, supports shutdown logic-level control (VSDTH_ON = 1.2V, VSDTH_OFF = 1.4V), and features internal frequency compensation - requiring only input/output capacitors, inductor, and Schottky diode for full operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±3% over 6V–36V input and 0.5A–3A load ensures stable core supply for 3.3V logic and microprocessors. |
| Switching Frequency | 200 kHz ±10% enables use of smaller inductors (≈50% size reduction vs. 52 kHz LM2576) and predictable EMI profile. |
| Max Output Current | Guaranteed 3A continuous switch current supports high-power embedded rails without external current boosting. |
| Input Voltage Range | 4V to 36V unregulated input accommodates wide industrial, automotive, and battery-derived supplies. |
| Efficiency | 72% typical at 3A load (VIN=12V) balances thermal performance and power loss in compact TO-263 layout. |
| Shutdown Current | <200 µA typical shutdown mode current enables low-quiescent-power system-level power gating. |
| Thermal Protection | Integrated thermal shutdown with 100% electrical burn-in ensures reliability under sustained overload or poor heatsinking. |
Pinout & Package
Package: 5-lead TO-263 (DDPAK), surface-mount, with exposed tab (Pin 3/TAB) serving as GND and primary thermal path. θJA = 65°C/W, θJC = 2°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply connection | Accepts 4V–36V DC; requires local 470 µF/63V bulk capacitor for stability and ripple suppression. |
| SW (Pin 2) | Switch node output | Drives external inductor (e.g., 33 µH); connects to cathode of Schottky diode (e.g., MBR360) and inductor. |
| GND / TAB (Pins 3 & TAB) | Power and signal ground reference | Tab is electrically connected to Pin 3; must be soldered to large PCB copper pour for thermal management and noise control. |
| FB (Pin 4) | Feedback input | Internally tied to 3.3V divider; connect directly to regulated output for closed-loop regulation - no external resistors needed. |
| SHDN (Pin 5) | Logic-controlled enable/disable input | TTL-compatible; ≤0.8V enables regulator, ≥2.4V disables it; draws <30 µA when active, <200 µA in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output with ±3% tolerance | Eliminates external feedback resistor network, reducing BOM count and layout sensitivity while ensuring compliance with 3.3V I/O and core supply specs. |
| 200 kHz fixed-frequency PWM | Enables predictable EMI filtering and allows use of smaller, lower-DCR inductors - e.g., 33 µH instead of 68 µH required by 52 kHz alternatives. |
| Cycle-by-cycle overcurrent protection | Detects peak switch current up to 7.9A (typical), preventing MOSFET or inductor saturation during short-circuit or startup surge. |
| Internal frequency compensation | Removes need for external compensation components, simplifying design validation and improving production yield across temperature and process variation. |
| TO-263 (DDPAK) thermal performance | θJC = 2°C/W enables direct heatsinking through the exposed tab, supporting 3A continuous operation with minimal PCB area. |
Applications
| Intel Pentium™ Core Supply | Industrial 24V-to-3.3V Conversion |
|---|---|
Use Scenario: Powering 3.3V I/O and core logic in legacy x86-based industrial controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V rail to tightly regulated 3.3V at up to 3A. Use Value: ±3% output accuracy and 200 kHz operation meet Intel VRD requirements while minimizing filter footprint on space-constrained PCBs. |
Use Scenario: Converting factory-floor 24V DC supply to 3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: High-current, robust step-down regulator with thermal and overcurrent protection for harsh environments. Use Value: Wide 4V–36V input range tolerates brownouts and transients; TO-263 package supports conduction cooling in sealed enclosures. |
| Battery-Powered Test Equipment | POS Terminal Power Management |
Use Scenario: Portable calibration tools powered by 12V LiFePO₄ battery packs (10.8V–14.4V). IC Role / Device Role / Timing Role: Efficient preregulator stepping down battery voltage to 3.3V for MCU and display subsystems. Use Value: 72% efficiency at 3A reduces heat rise in handheld form factor; <200 µA shutdown current extends standby time. |
Use Scenario: Point-of-sale terminals requiring reliable 3.3V rail for touchscreens, NFC readers, and secure elements. IC Role / Device Role / Timing Role: Main 3.3V power source fed from 12V or 24V wall adapter or backup battery. Use Value: Integrated thermal shutdown prevents field failures during prolonged operation; pinout compatibility simplifies redesign from LM2576. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC4576-3.3WT | Same IC die and electrical specs, but in TO-220 package with through-hole leads and higher θJA (65°C/W same, but less effective heatsinking without clip). | Suitable for prototyping or low-volume assemblies where manual soldering or socketing is preferred. | Select MIC4576-3.3WT for breadboarding or legacy board rework; MIC4576-3.3WU-TR for automated SMT production and better thermal performance. |
| LM2576-3.3 | 52 kHz switching frequency, larger required inductor (≈2× value), ±4% output tolerance, no integrated SHDN pin (requires external transistor). | Used in cost-sensitive, low-EMI designs where size is secondary and legacy compatibility is critical. | Choose LM2576-3.3 only if redesign is impractical; MIC4576-3.3WU-TR offers superior efficiency, smaller magnetics, and simpler enable control. |
Compared with MIC4576-3.3WT and LM2576-3.3, the MIC4576-3.3WU-TR delivers identical regulation performance in a thermally superior surface-mount package with native shutdown control - reducing bill-of-materials, PCB area, and thermal derating concerns in volume production.
Availability
MIC4576-3.3WU-TR is available at Aetrix Electronics and suitable for Intel Pentium™-based computing, industrial 24V-to-3.3V conversion, and battery-powered test equipment requiring stable component supply and long-term manufacturability.
Supply support for MIC4576-3.3WU-TR 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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with emphasis on industrial, automotive, and aerospace reliability standards.
The MIC4576 series was designed as a drop-in upgrade to the LM2576 family, delivering higher switching frequency, tighter output tolerance, and simplified layout for high-current DC-DC buck conversion in industrial and embedded systems.
FAQ
What is the maximum input voltage rating for the MIC4576-3.3WU-TR?
The MIC4576-3.3WU-TR has an absolute maximum input voltage rating of +40V, with recommended operating range up to +36V. Exceeding +36V may trigger internal protection or cause permanent damage. The device is specified for stable 3.3V output across 6V–36V input under full 3A load and industrial temperature conditions.
Does the MIC4576-3.3WU-TR require external feedback resistors?
No - the MIC4576-3.3WU-TR is a fixed-output variant with internal feedback divider optimized for 3.3V regulation. Pin 4 (FB) must be connected directly to the output node; no external resistors are needed, unlike adjustable versions such as MIC4576WU-TR.
What thermal considerations apply to the MIC4576-3.3WU-TR in TO-263 package?
The MIC4576-3.3WU-TR uses a TO-263 (DDPAK) package with θJA = 65°C/W and θJC = 2°C/W. Effective thermal design requires soldering the exposed tab (Pin 3) to a minimum 1-inch² copper pour with multiple thermal vias to inner ground planes to sustain 3A continuous output without thermal shutdown.
Can the MIC4576-3.3WU-TR be used in parallel for higher current?
Yes - the MIC4576-3.3WU-TR supports parallel operation using external current-sharing resistors and synchronized shutdown control, as demonstrated in Figure 4-6 of the datasheet. However, each IC must have independent input/output filtering to avoid instability or circulating currents.
Is the MIC4576-3.3WU-TR RoHS-compliant and lead-free?
Yes - the MIC4576-3.3WU-TR is RoHS-compliant and features matte tin (Sn) lead finish per JEDEC Pb-free designation. The "W" temperature grade denotes –40°C to +85°C industrial operation, and the "U" package confirms TO-263 (DDPAK) with lead-free construction.
MIC4576-3.3WU-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC4576-3.3WU-TR FAQ
1.How can I place an order for MIC4576-3.3WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576-3.3WU-TR 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 MIC4576-3.3WU-TR reliable?
The price and inventory of MIC4576-3.3WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4576-3.3WU-TR is usually 5 days.
3.What payment methods are accepted for MIC4576-3.3WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576-3.3WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576-3.3WU-TR?
MIC4576-3.3WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576-3.3WU-TR 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 MIC4576-3.3WU-TR?
For technical support, including MIC4576-3.3WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576-3.3WU-TR requirements.
6.How does Aetrix verify that MIC4576-3.3WU-TR is sourced from the original manufacturer or authorized distributors?
All MIC4576-3.3WU-TR 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 MIC4576-3.3WU-TR meets industry standards.
7.What is the process for return or replacement of MIC4576-3.3WU-TR?
All MIC4576-3.3WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576-3.3WU-TR, 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 MIC4576-3.3WU-TR part is unused and in its original packaging.
Return procedure for MIC4576-3.3WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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