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Microchip Technology MIC4576-5.0BT
- Part No.:
- MIC4576-5.0BT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
MIC4576-5.0BT.pdf
- Description:
- IC REG BUCK 5V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,829
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Product details
Overview
MIC4576-5.0BT 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 and load, 4V–36V input range, and thermal/overcurrent protection-designed for industrial power conversion in embedded systems, battery chargers, and microprocessor supply rails.
For engineers reviewing the MIC4576-5.0BT datasheet, MIC4576-5.0BT pinout, MIC4576-5.0BT application, or MIC4576-5.0BT equivalent, key selection criteria include guaranteed 3A switch current, TO-220 package thermal performance (θJC = 2°C/W), shutdown current <200 µA, and compatibility with standard inductors at reduced size versus LM2576.
Technical Context
The MIC4576-5.0BT integrates a BiCMOS 3A NPN power switch, 1.23V bandgap reference, and 200 kHz oscillator with cycle-by-cycle current limiting and thermal shutdown. Its fixed 5.0V output eliminates external feedback resistors, simplifying layout while maintaining ±3% regulation across –40°C to +85°C.
It operates as a voltage-mode buck controller with internal frequency compensation and TTL-compatible shutdown logic (VSDTH_ON = 1.2V, VSDTH_OFF = 1.4V). The 5-pin TO-220 package features an exposed tab (Pin 3/TAB) tied to GND for low-thermal-resistance heat dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% (guaranteed over 8V–36V input, 0.5A–3A load, –40°C to +85°C) |
| Switch Current | Guaranteed 3A peak switch current supports continuous 3A DC output with margin |
| Input Range | 4V to 36V unregulated input enables wide-source compatibility (e.g., 12V/24V industrial rails, battery packs) |
| Switching Frequency | 200 kHz ±10% allows use of smaller inductors (≈50% size reduction vs. 52 kHz LM2576) |
| Shutdown Current | <200 µA typical (50 µA typical at VSHDN = 5V) enables ultra-low-power standby modes |
| Thermal Resistance | θJC = 2°C/W (TO-220) ensures efficient heat transfer to heatsink; θJA = 65°C/W for ambient-limited operation |
| Protection Features | Integrated cycle-by-cycle overcurrent limit, thermal shutdown, and 100% electrical burn-in screening |
Pinout & Package
Package: 5-Lead TO-220 (T), with exposed metal tab (Pin 3) electrically connected to GND and thermally coupled to die for low-junction-to-case resistance (θJC = 2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply | Accepts 4V–36V; must be decoupled with ≥470 µF low-ESR capacitor near pin |
| SW (Pin 2) | Switch node output | Drives external inductor/diode; high di/dt node requiring short, low-inductance PCB routing |
| GND / TAB (Pin 3) | Power and signal ground | Exposed metal tab is GND; must be soldered to large copper pour for thermal and EMI control |
| FB (Pin 4) | Feedback input | Internally connected to 5.0V divider; connect directly to output for fixed-voltage regulation |
| SHDN (Pin 5) | Enable/disable control | TTL-compatible input; <1.2V enables, >2.4V disables; draws <30 µA when active |
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 standard 33 µH inductors (vs. 68–100 µH for 52 kHz parts), cutting filter size and cost |
| 3A guaranteed switch current | Supports full 3A continuous output without derating under worst-case thermal conditions (θJC = 2°C/W) |
| Low shutdown current | <200 µA shutdown draw extends battery life in portable or always-on systems with enable control |
| Integrated protections | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload or short-circuit faults |
Applications
| Industrial Power Supply | Microprocessor Core Supply |
|---|---|
|
Use Scenario: Converting 24V rail to stable 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V/3A with high efficiency and fault resilience. Use Value: Enables compact, fanless enclosure design via 2°C/W thermal resistance and integrated overtemperature protection. |
Use Scenario: Providing clean 5V supply to Intel Pentium™-class microprocessors and FPGA configuration circuits. IC Role / Device Role / Timing Role: Pre-regulator stepping down intermediate bus voltage before LDO post-regulation. Use Value: Reduces heat generation versus linear regulators; ±3% tolerance meets core logic voltage requirements. |
| Battery Charger Front-End | Negative Boost Converter |
|
Use Scenario: Charging 12V sealed lead-acid batteries from variable solar or vehicle sources (8–36V). IC Role / Device Role / Timing Role: Constant-voltage stage regulator maintaining precise 5.0V reference for charge controller ICs. Use Value: Input range accommodates wide PV array or automotive transients; shutdown mode minimizes parasitic drain. |
Use Scenario: Generating –5V rail from positive 12V source for op-amp biasing or analog interface circuits. IC Role / Device Role / Timing Role: Inverting buck-boost topology using MIC4576-5.0BT with external diode/inductor reconfiguration. Use Value: Leverages same 200 kHz timing and 3A switch capability-no redesign needed for polarity inversion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-5.0 | 52 kHz switching, larger inductor requirement (≈2×), ±4% output tolerance, higher quiescent current (5 mA vs. 5–10 mA active) | Legacy design reuse where board space and efficiency are less critical; not drop-in due to frequency and pinout differences | Select if legacy LM2576 footprint exists and 200 kHz EMI sensitivity is a concern. |
| MIC4576-5.0WT | Identical electrical specs and pinout; differs only in packaging-TO-220 (T) vs. TO-220 (BT) denotes bent leads per Microchip ordering convention | No functional difference; BT variant optimized for automated through-hole insertion with pre-bent leads | Choose MIC4576-5.0BT for manual or selective solder assembly; MIC4576-5.0WT for standard straight-lead pick-and-place. |
Compared with LM2576-5.0, MIC4576-5.0BT delivers 2× higher switching frequency and tighter output tolerance in the same TO-220 footprint; versus MIC4576-5.0WT, it offers identical performance with bent-lead mechanical optimization for specific assembly lines.
Availability
MIC4576-5.0BT is available at Aetrix Electronics and suitable for industrial power supplies, microprocessor core rails, and battery charger front-ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4576-5.0BT 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 reliability, longevity, and industrial-grade qualification.
The MIC4576 series was designed as a high-frequency, pin-compatible upgrade to the LM2576 for industrial and embedded power conversion-emphasizing ease of use, minimal external components, and robust thermal performance in TO-220/TO-263 packages.
FAQ
What is the maximum input voltage rating for the MIC4576-5.0BT?
The MIC4576-5.0BT has an absolute maximum input voltage of +40V, but its recommended operating input range is +4V to +36V. Operation above 36V risks exceeding safe junction temperature or violating SOA limits-even briefly-so designs must ensure transient clamping or filtering to stay within the 36V operational ceiling. The MIC4576-5.0BT's internal protection does not cover sustained overvoltage beyond this limit.
Does the MIC4576-5.0BT require external compensation components?
No, the MIC4576-5.0BT includes fully internal frequency compensation, eliminating the need for external capacitors or resistors in the feedback loop. This simplifies design and improves stability across the full 0.5A–3A load range and 4V–36V input span. The MIC4576-5.0BT achieves this via integrated error amplifier and sawtooth comparator architecture, validated across –40°C to +85°C.
Can the MIC4576-5.0BT be used in negative-output (inverting) configurations?
Yes-the MIC4576-5.0BT supports inverting buck-boost topologies to generate negative voltages (e.g., –5V from +12V), as documented in Microchip Application Note AN14. The MIC4576-5.0BT's 3A switch and 200 kHz frequency remain fully applicable; only external component polarity and grounding change. No internal modification or special version is required.
What is the thermal performance difference between MIC4576-5.0BT and MIC4576-5.0WT?
There is no thermal performance difference-the MIC4576-5.0BT and MIC4576-5.0WT share identical TO-220 package construction, die, and thermal characteristics (θJC = 2°C/W, θJA = 65°C/W). The "BT" suffix denotes bent leads for through-hole assembly; "WT" indicates straight leads. Both deliver identical junction-to-case and junction-to-ambient performance when mounted identically.
Is the MIC4576-5.0BT pin-compatible with the LM2576-5.0?
No-while the MIC4576-5.0BT duplicates the LM2576's functional pinout (VIN, SW, GND, FB, SHDN), its physical pin spacing and tab connection differ. The MIC4576-5.0BT uses Micrel/Microchip's LB03 TO-220 outline (0.067" pitch), whereas LM2576 uses standard TO-220 (0.1" pitch). PCB layout must be revised; direct replacement is not mechanically possible without adapter or redesign.
MIC4576-5.0BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
MIC4576-5.0BT FAQ
1.How can I place an order for MIC4576-5.0BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576-5.0BT 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 MIC4576-5.0BT reliable?
The price and inventory of MIC4576-5.0BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4576-5.0BT is usually 5 days.
3.What payment methods are accepted for MIC4576-5.0BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576-5.0BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576-5.0BT?
MIC4576-5.0BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576-5.0BT 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 MIC4576-5.0BT?
For technical support, including MIC4576-5.0BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576-5.0BT requirements.
6.How does Aetrix verify that MIC4576-5.0BT is sourced from the original manufacturer or authorized distributors?
All MIC4576-5.0BT 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 MIC4576-5.0BT meets industry standards.
7.What is the process for return or replacement of MIC4576-5.0BT?
All MIC4576-5.0BT units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576-5.0BT, 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 MIC4576-5.0BT part is unused and in its original packaging.
Return procedure for MIC4576-5.0BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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