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Microchip Technology MIC4576-5.0WT
- Part No.:
- MIC4576-5.0WT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
MIC4576-5.0WT.pdf
- Description:
- IC REG BUCK 5V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,644
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Product details
Overview
MIC4576-5.0WT from Microchip Technology is a fixed-output 5.0V, 3A step-down (buck) switching regulator with 200 kHz switching frequency, ±3% output voltage accuracy over line/load conditions, 4V–36V input range, and TO-220-5 package. It delivers high-efficiency power conversion for industrial embedded systems requiring stable 5V/3A rails from wide-input unregulated sources.
For engineers reviewing the MIC4576-5.0WT datasheet, MIC4576-5.0WT pinout, MIC4576-5.0WT application, or MIC4576-5.0WT equivalent, key selection criteria include guaranteed 3A switch current, thermal shutdown protection, <200 µA shutdown current, compatibility with standard inductors (25% smaller than LM2576), and fixed 5V output with no external feedback divider required.
Technical Context
The MIC4576-5.0WT integrates a BiCMOS NPN power switch, 1.23V bandgap reference, error amplifier, and 200 kHz oscillator to implement variable-duty-cycle pulse-width modulation. Its internal compensation eliminates external compensation components, and its cycle-by-cycle current limiting ensures robust fault handling without external sensing.
Designed as a drop-in functional upgrade to the LM2576, it maintains identical pinout and control logic while doubling the switching frequency-enabling up to 2:1 reduction in output filter inductor size. The fixed 5.0V version uses an internal resistive divider tied to the FB pin, eliminating external resistor networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over 8V–36V input and 0.5A–3A load - ensures stable logic supply for microcontrollers and peripherals without trimming. |
| Switch Current | Guaranteed 3A peak - supports continuous 3A DC output with margin for transient loads in industrial power rails. |
| Switching Frequency | 200 kHz ±10% - enables use of smaller magnetics versus 52 kHz LM2576, reducing board area and cost. |
| Input Voltage Range | 4V to 36V - accommodates 12V/24V battery systems, automotive, and industrial unregulated supplies. |
| Shutdown Current | <200 µA typical - allows low-power standby modes in battery-backed or energy-sensitive applications. |
| Efficiency | 77% typical at 3A load - minimizes thermal dissipation in TO-220 package without forced airflow. |
| Thermal Protection | Integrated thermal shutdown - prevents damage during overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
Package: 5-Lead TO-220 (T), industrial temperature range (–40°C to +85°C), RoHS-compliant, with tab connected to GND for thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Unregulated input supply | Accepts 4V–36V DC; requires ≥470 µF bulk capacitance near pin for stability and ripple suppression. |
| 2 - SW | Switch node output | Drives external inductor and Schottky diode; high dv/dt node requiring short PCB trace and ground plane return. |
| 3 & Tab - GND | Power and signal ground | Common return for input cap, output cap, and feedback; tab must be soldered to large copper pour for thermal conduction. |
| 4 - FB | Feedback input | Internally tied to 5V divider; connect directly to output for fixed regulation-no external resistors needed. |
| 5 - SHDN | Enable/disable control | TTL-compatible logic input; <1.2V enables, >2.4V disables; draws <30 µA when active, <200 µA in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external feedback resistors-reduces BOM count, layout complexity, and calibration drift. |
| 200 kHz switching | Enables use of 33 µH inductors (vs. ~68–100 µH for LM2576), cutting inductor volume and EMI filter size. |
| Internal frequency compensation | Removes need for external compensation network-simplifies design and improves production consistency. |
| Cycle-by-cycle current limit | Provides immediate overcurrent response without external sense resistor-enhances reliability under short-circuit. |
| Thermal shutdown with auto-recovery | Protects against sustained overload or inadequate heatsinking; resumes operation after junction cools below threshold. |
Applications
| Industrial 5V Power Rail | Microprocessor Preregulator |
|---|---|
Use Scenario: Providing clean, regulated 5V/3A to PLC I/O modules, sensor interfaces, and fieldbus controllers operating from 12–24V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering main system power rail with tight voltage tolerance and thermal resilience. Use Value: ±3% output accuracy ensures reliable logic-level compatibility across temperature; TO-220 package supports direct heatsink mounting in confined enclosures. |
Use Scenario: Generating 5V intermediate supply for linear regulators feeding noise-sensitive analog circuits or FPGA core rails. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing dropout and heat in downstream LDOs. Use Value: 77% efficiency at full load minimizes thermal load on secondary regulators; 200 kHz operation eases filtering of switching noise before LDO input. |
| Automotive Body Control Module | POS Terminal Power Supply |
Use Scenario: Converting vehicle battery (9–16V) to stable 5V for MCU, display, and communication ICs in BCMs with wide ambient temperature swings. IC Role / Device Role / Timing Role: Main DC-DC converter enabling cold-crank operation down to 4V input. Use Value: 4V minimum input supports engine cranking dips; –40°C to +85°C rating matches automotive under-hood requirements. |
Use Scenario: Powering retail POS terminals with integrated printers and barcode scanners from universal AC adapters or 12V PoE injectors. IC Role / Device Role / Timing Role: Compact, self-contained 5V/3A source replacing bulky transformer-based supplies. Use Value: TO-220 footprint fits space-constrained designs; <200 µA shutdown current extends battery backup runtime during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-5.0 | 52 kHz switching, larger inductor requirement (68–100 µH), same TO-220-5 pinout, ±4% output tolerance | Lower-frequency design increases EMI filtering burden and inductor size; suitable where legacy compatibility is critical | Select LM2576-5.0 only if redesign is impractical; MIC4576-5.0WT offers superior efficiency and smaller magnetics with identical footprint. |
| MIC4576-5.0WU | Identical electrical specs but in TO-263 (DDPAK) package; lower θJC (2°C/W), surface-mount compatible | Requires SMT assembly and PCB reflow; better thermal performance in high-density layouts but no through-hole option | Choose MIC4576-5.0WU for automated manufacturing and improved thermal management; MIC4576-5.0WT preferred for prototyping, repair, or heatsink-mounting flexibility. |
Compared with LM2576-5.0, the MIC4576-5.0WT delivers higher efficiency and smaller passive components at the same pinout; compared with MIC4576-5.0WU, it trades surface-mount convenience for through-hole serviceability and simplified thermal interface via TO-220 tab mounting.
Availability
MIC4576-5.0WT is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and point-of-sale terminal power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MIC4576-5.0WT 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 a focus on embedded control and industrial reliability.
The MIC4576 series was designed as a high-frequency, drop-in replacement for legacy buck regulators like the LM2576-targeting industrial, automotive, and embedded applications needing compact, efficient, and thermally robust 3A DC-DC conversion.
FAQ
What is the maximum input voltage for the MIC4576-5.0WT?
The MIC4576-5.0WT supports an absolute maximum input voltage of +40V, with recommended continuous operation up to +36V. Operation above 36V risks exceeding absolute maximum ratings and may trigger internal protection or cause permanent damage. Always maintain input transients within the 40V limit using clamping or filtering.
Does the MIC4576-5.0WT require external feedback resistors?
No, the MIC4576-5.0WT does not require external feedback resistors. As a fixed 5.0V output variant, it incorporates an internal precision resistive divider connected to the FB pin. The FB pin must be connected directly to the output voltage node to close the regulation loop-no external components are needed for voltage setting.
Can the MIC4576-5.0WT be used in parallel for higher current?
Yes, the MIC4576-5.0WT can be configured in parallel for higher output current, as demonstrated in Figure 4-6 of the datasheet. This requires matched inductors, synchronized shutdown control, and careful attention to current-sharing resistors and layout symmetry to ensure balanced loading and avoid circulating currents.
What is the thermal resistance of the MIC4576-5.0WT package?
The MIC4576-5.0WT in TO-220-5 package has a junction-to-air thermal resistance (θJA) of 65°C/W and a junction-to-case thermal resistance (θJC) of 2°C/W. Effective heatsinking via the GND tab is essential to sustain 3A output at elevated ambient temperatures; derating is required above 60°C ambient without forced airflow.
Is the MIC4576-5.0WT pin-compatible with the LM2576-5.0?
Yes, the MIC4576-5.0WT is fully pin-compatible with the LM2576-5.0 in the TO-220-5 package, sharing identical pin numbering, function mapping, and footprint. It duplicates the LM2576's functionality while upgrading switching frequency to 200 kHz and improving output accuracy to ±3%.
MIC4576-5.0WT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
MIC4576-5.0WT FAQ
1.How can I place an order for MIC4576-5.0WT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576-5.0WT 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 MIC4576-5.0WT reliable?
The price and inventory of MIC4576-5.0WT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4576-5.0WT is usually 5 days.
3.What payment methods are accepted for MIC4576-5.0WT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576-5.0WT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576-5.0WT?
MIC4576-5.0WT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576-5.0WT 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 MIC4576-5.0WT?
For technical support, including MIC4576-5.0WT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576-5.0WT requirements.
6.How does Aetrix verify that MIC4576-5.0WT is sourced from the original manufacturer or authorized distributors?
All MIC4576-5.0WT 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 MIC4576-5.0WT meets industry standards.
7.What is the process for return or replacement of MIC4576-5.0WT?
All MIC4576-5.0WT units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576-5.0WT, 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 MIC4576-5.0WT part is unused and in its original packaging.
Return procedure for MIC4576-5.0WT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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