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Microchip Technology MIC4576-5.0BU TR
- Part No.:
- MIC4576-5.0BU TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4576-5.0BU TR.pdf
- Description:
- IC REG BUCK 5V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,941
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Product details
Overview
MIC4576-5.0BU TR from Microchip Technology is a fixed-output 5.0V, 3A synchronous step-down (buck) switching regulator with 200 kHz switching frequency, ±3% output voltage accuracy over line/load/temperature, 4V–36V input range, and integrated thermal shutdown and cycle-by-cycle current limiting - deployed in industrial power supplies and embedded system preregulators.
For engineers reviewing the MIC4576-5.0BU TR datasheet, MIC4576-5.0BU TR pinout, MIC4576-5.0BU TR application, or MIC4576-5.0BU TR equivalent, key selection criteria include guaranteed 3A switch current, TO-263 (DDPAK) package thermal performance (θJC = 2°C/W), shutdown current <200 µA, and compatibility with standard inductors at reduced size versus LM2576.
Technical Context
The MIC4576-5.0BU TR implements a BiCMOS-based buck topology with internal 3A NPN power switch, 1.23V bandgap reference, and fixed-gain error amplifier comparing FB voltage to reference. Its 200 kHz oscillator enables smaller external LC filters than 52 kHz predecessors like LM2576.
Operation relies on duty-cycle modulation via sawtooth comparison: feedback voltage deviation from 1.23V adjusts error amp output, which modulates PWM width to regulate output. Shutdown logic is TTL-compatible, with 1.2V turn-on and 1.4V turn-off thresholds, enabling direct microcontroller interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% (guaranteed across –40°C to +85°C, 8V–36V input, 0.5A–3A load) |
| Switch Current | Guaranteed 3A continuous (peak current limit 4.2–7.9A, tON ≤ 3 µs) |
| Input Range | 4V to 36V DC (absolute max +40V; optimized efficiency near +15V) |
| Switching Frequency | 200 kHz ±10% (enables ~2× inductor size reduction vs. 52 kHz LM2576) |
| Shutdown Current | <200 µA typical (50 µA typical at VSHDN = 5V, TJ = +25°C) |
| Thermal Resistance | θJC = 2°C/W (TO-263 package; enables high-power dissipation with minimal case-to-junction rise) |
| Efficiency | 77% typical at 3A load (VIN = 12V, VOUT = 5V; improves with higher VIN/VOUT ratio) |
Pinout & Package
Package: 5-Lead TO-263 (DDPAK), surface-mount, thermally enhanced with exposed tab (GND-connected). Pin 1 (VIN) to Pin 5 (SHDN) arranged linearly; tab is electrically connected to Pin 3 (GND) and serves as primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Unregulated input supply | Accepts 4V–36V DC; must be decoupled with ≥470 µF low-ESR capacitor near pin |
| 2 - SW | Switch node output | Drives external inductor/diode; high di/dt node requiring short PCB trace and ground plane |
| 3 & Tab - GND | Power and signal reference | Common return for input cap, output cap, feedback divider, and thermal path to heatsink |
| 4 - FB | Voltage feedback input | Internally tied to 5V output divider; connects directly to regulated 5V rail (no external resistors) |
| 5 - SHDN | Logic-level enable/disable | TTL-compatible: ≤0.8V = ON, ≥2.4V = OFF; 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 and layout sensitivity vs. adjustable variants |
| 200 kHz switching | Enables use of 33 µH inductors (25% value of typical LM2576 designs), shrinking filter footprint by ~40% |
| Integrated protection | Cycle-by-cycle current limiting + thermal shutdown prevent damage during overload or poor heatsinking |
| Low quiescent current | 5–10 mA operating IQ and <200 µA shutdown current extend battery life in always-on systems |
| TO-263 thermal design | 2°C/W junction-to-case resistance supports 3A continuous operation with minimal heatsink area |
Applications
| Industrial Power Supply | Embedded System Preregulator |
|---|---|
Use Scenario: Converting 24V rail to stable 5V for PLC I/O modules and sensor interfaces in harsh environments. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC buck regulator delivering 3A continuous current with ±3% regulation under wide temperature and load transients. Use Value: Eliminates need for external current-sense or compensation components; TO-263 package withstands vibration and thermal cycling per industrial standards. | Use Scenario: Generating clean 5V intermediate rail for FPGA core logic and peripheral interfaces in edge computing gateways. IC Role / Device Role / Timing Role: High-efficiency preregulator ahead of low-noise LDOs, reducing heat generation compared to linear solutions. Use Value: 77% efficiency at 3A lowers thermal load on PCB; 200 kHz frequency avoids audible noise and simplifies EMI filtering. |
| Battery Charger Front-End | Microprocessor Core Supply |
Use Scenario: Stepping down 12–36V automotive or LiFePO₄ battery pack voltage to 5V for charging management ICs and USB-PD controllers. IC Role / Device Role / Timing Role: Robust input-stage regulator tolerant of load dump (up to +40V transient) and cold-crank (down to 4V). Use Value: Absolute max VIN = +40V and –40°C to +85°C rating ensure reliability in vehicle environments without derating. | Use Scenario: Providing 5V/3A to Intel Pentium™-class microprocessors and companion chips requiring tight voltage tolerance. IC Role / Device Role / Timing Role: Fixed-output buck regulator meeting ±3% VOUT spec across full industrial temperature range and dynamic load steps. Use Value: Guaranteed output accuracy eliminates need for post-regulation trimming; pinout compatibility with LM2576 eases legacy design upgrades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC4576-5.0WT | Same electrical specs, but TO-220 through-hole package (θJA = 65°C/W vs. TO-263's 65°C/W; identical θJC) | Requires wave soldering and board real estate; less suitable for high-density SMT lines | Select MIC4576-5.0WT only if manual assembly, prototyping, or heatsink mounting via screw is preferred. |
| LM2576-5.0 | 52 kHz switching, larger inductors required, ±4% output tolerance, no shutdown pin, TO-220 only | Lacks enable control and has lower efficiency (~70% at 3A); not drop-in due to different pinout and frequency | Choose LM2576-5.0 only for cost-sensitive legacy designs where 200 kHz EMI or size constraints are irrelevant. |
Compared with MIC4576-5.0WT and LM2576-5.0, the MIC4576-5.0BU TR delivers identical regulation performance in a space-optimized TO-263 package with shutdown control - enabling automated assembly, better thermal management, and design flexibility for modern compact power systems.
Availability
MIC4576-5.0BU TR is available at Aetrix Electronics and suitable for industrial power supplies, embedded system preregulators, battery charger front-ends, and microprocessor core supplies requiring stable component supply and long-term production continuity.
Supply support for MIC4576-5.0BU 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 a focus on industrial, automotive, and communications markets.
The MIC4576 product line delivers easy-to-use, high-current buck regulators targeting cost-sensitive, thermally constrained applications where simplicity, reliability, and compatibility with legacy designs are critical.
FAQ
What is the maximum input voltage rating for the MIC4576-5.0BU TR?
The MIC4576-5.0BU TR has an absolute maximum input voltage (VIN) rating of +40V, with recommended continuous operation up to +36V. Exceeding +40V risks permanent damage. The device operates reliably across its specified 4V–36V input range, maintaining ±3% output regulation and thermal protection throughout.
Does the MIC4576-5.0BU TR require external feedback resistors?
No, the MIC4576-5.0BU TR does not require external feedback resistors. As a fixed 5.0V output variant, it integrates the internal resistor divider connected to the FB pin, which is internally referenced to the 5V output. The FB pin must be connected directly to the regulated 5V output rail - no external components are needed for voltage setting.
What is the thermal resistance and how does it affect heatsink design for MIC4576-5.0BU TR?
The MIC4576-5.0BU TR in TO-263 (DDPAK) package has θJC = 2°C/W and θJA = 65°C/W. With a maximum junction temperature of +150°C and ambient up to +85°C, the allowable power dissipation is limited by thermal path to the PCB copper. A 2 oz. copper pour under the tab significantly improves heat transfer - no additional heatsink is required for 3A operation at moderate ambient temperatures.
Can the MIC4576-5.0BU TR be used in battery-powered applications with low standby power?
Yes, the MIC4576-5.0BU TR supports ultra-low-power operation: shutdown current is typically 50 µA (max 200 µA), and quiescent current in active mode is only 5–10 mA. When paired with a microcontroller GPIO driving the SHDN pin, the MIC4576-5.0BU TR enables rapid wake-up from deep sleep states while minimizing system-level battery drain.
Is the MIC4576-5.0BU TR pin-compatible with the LM2576-5.0?
No, the MIC4576-5.0BU TR is not pin-compatible with the LM2576-5.0. Although both are 5V buck regulators, the MIC4576 features a 5-pin TO-263 layout (VIN, SW, GND, FB, SHDN), whereas the LM2576 uses a 5-pin TO-220 with different pin order (IN, OUT, GND, FEEDBACK, ON/OFF). Electrical function differs too - MIC4576 includes shutdown control and 200 kHz operation, requiring updated PCB layout.
MIC4576-5.0BU 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:
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC4576-5.0BU TR FAQ
1.How can I place an order for MIC4576-5.0BU TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576-5.0BU 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 MIC4576-5.0BU TR reliable?
The price and inventory of MIC4576-5.0BU TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4576-5.0BU TR is usually 5 days.
3.What payment methods are accepted for MIC4576-5.0BU TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576-5.0BU TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576-5.0BU TR?
MIC4576-5.0BU TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576-5.0BU 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 MIC4576-5.0BU TR?
For technical support, including MIC4576-5.0BU TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576-5.0BU TR requirements.
6.How does Aetrix verify that MIC4576-5.0BU TR is sourced from the original manufacturer or authorized distributors?
All MIC4576-5.0BU 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 MIC4576-5.0BU TR meets industry standards.
7.What is the process for return or replacement of MIC4576-5.0BU TR?
All MIC4576-5.0BU TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576-5.0BU 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 MIC4576-5.0BU TR part is unused and in its original packaging.
Return procedure for MIC4576-5.0BU TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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