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Microchip Technology MIC4576-5.0WU-TR
- Part No.:
- MIC4576-5.0WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4576-5.0WU-TR.pdf
- Description:
- IC REG BUCK 5V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,404
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Product details
Overview
MIC4576-5.0WU-TR from Microchip Technology is a fixed-output 5.0V, 3A synchronous step-down (buck) DC-DC regulator in TO-263 (DDPAK) package, operating at 200 kHz with ±3% output voltage accuracy over 8V–36V input and full load range. It integrates a 3A NPN switch, internal compensation, thermal shutdown, and cycle-by-cycle current limiting-designed for high-efficiency on-card power conversion in industrial embedded systems.
For engineers reviewing the MIC4576-5.0WU-TR datasheet, MIC4576-5.0WU-TR pinout, MIC4576-5.0WU-TR application, or MIC4576-5.0WU-TR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application roles, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The MIC4576-5.0WU-TR implements a fixed-frequency (180–220 kHz) PWM buck controller with internal 1.23V bandgap reference and error amplifier comparing feedback against that reference. Its NPN output switch delivers up to 3A continuous current with typical saturation voltage of 1.7V at 3A and guaranteed current limit of 4.2–7.9A peak.
Shutdown is TTL-compatible: logic low (≤0.8V) enables regulation; logic high (≥2.4V) disables it, reducing quiescent current to ≤200 µA. Feedback is internally tied to output for fixed 5.0V operation-no external resistor divider required-enabling minimal BOM count and simplified layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over 8V–36V input and 0.5A–3A load-guaranteed regulation without trimming or calibration. |
| Switching Frequency | 200 kHz ±10%-enables use of smaller inductors (≈50% size reduction vs. LM2576) and predictable EMI profile. |
| Max Output Current | 3A continuous-supports single-rail microprocessor core or FPGA I/O supply without derating at +85°C ambient. |
| Input Voltage Range | 4V to 36V-covers wide industrial input sources including 12V/24V rails, battery-backed systems, and unregulated adapters. |
| Efficiency | 77% typical at 5V/3A output-reduces thermal load versus linear regulators and enables compact heatsink-free designs. |
| Shutdown Current | ≤200 µA-preserves battery life in standby mode for portable or energy-sensitive applications. |
| Thermal Protection | Integrated thermal shutdown with 100% electrical burn-in-prevents catastrophic failure under sustained overload or poor airflow. |
Pinout & Package
Package: 5-lead TO-263 (DDPAK), surface-mount, with exposed thermal pad (Tab = GND). Thermal resistance θJC = 2°C/W enables direct PCB copper pour for efficient heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. VIN | Unregulated input supply | Accepts 4V–36V DC; requires ≥470µF/63V bulk capacitor for stability and ripple suppression. |
| 2. SW | Switch node output | Drives external inductor (e.g., 33µH); connects to cathode of Schottky diode (e.g., MBR360) and inductor's free end. |
| 3 & Tab. GND | Power and signal ground | Common return for input cap, output cap, feedback, and shutdown; tab must be soldered to large copper area for thermal conduction. |
| 4. FB | Feedback input | Internally connected to 5.0V output-no external resistors needed; shorting FB to GND disables regulation. |
| 5. SHDN | Enable/disable control | TTL-compatible input: ≤0.8V = ON, ≥2.4V = OFF; floating defaults to ON; pull-down resistor recommended if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external feedback resistors-reduces component count, layout area, and calibration risk in production. |
| 200 kHz switching frequency | Enables standard 33µH inductors instead of larger 68–100µH units-cuts solution size by ≈40% vs. legacy 52 kHz regulators. |
| Guaranteed 3A switch current | Supports full-rated load across –40°C to +85°C without external current sensing or derating calculations. |
| Internal frequency compensation | Removes need for external compensation network-simplifies design validation and reduces BOM cost and test time. |
| Thermal shutdown + overcurrent protection | Self-protecting under short-circuit, overload, or inadequate heatsinking-no external fault-handling circuitry required. |
Applications
| Industrial PLC Power Supply | Embedded Microprocessor Core Rail |
|---|---|
|
Use Scenario: Providing stable 5V/3A to programmable logic controllers operating from 24V DC field buses with variable load transients. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V rail to CPU, I/O buffers, and communication peripherals. Use Value: ±3% output accuracy ensures reliable digital logic operation; 200 kHz switching minimizes filter size in space-constrained DIN-rail enclosures. |
Use Scenario: Powering Intel Pentium™-class or ARM-based microprocessors requiring clean 5V at up to 3A during burst-mode execution. IC Role / Device Role / Timing Role: High-current step-down converter supplying core voltage directly to processor VCC pins. Use Value: 77% efficiency at full load reduces thermal stress on adjacent memory and interface ICs; TO-263 thermal pad enables direct PCB heatsinking. |
| On-Card DC-DC Converter | Battery Charger Pre-regulator |
|
Use Scenario: Generating local 5V rail on dense PCBs where space prohibits discrete buck modules or multi-layer inductor integration. IC Role / Device Role / Timing Role: Integrated switch-mode regulator replacing linear LDOs to avoid excessive power dissipation on board. Use Value: Minimal external components (1 inductor, 2 capacitors, 1 diode) reduce layout complexity and improve yield in high-volume manufacturing. |
Use Scenario: Pre-regulating variable 12–36V battery input to fixed 5V before entering linear charging circuitry for Li-ion packs. IC Role / Device Role / Timing Role: Efficient preregulator stepping down high-voltage source to reduce dropout and heat in downstream linear charger ICs. Use Value: 4V–36V input range accommodates wide battery state-of-charge swing; shutdown pin allows precise charge enable/disable sequencing. |
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 frequency; requires larger inductor (≈68µH); ±4% output tolerance; TO-220 only. | Lower frequency increases EMI filtering burden and solution size; not suitable for space-constrained or high-density layouts. | Choose LM2576-5.0 only when legacy compatibility, lower EMI sensitivity, or existing 52 kHz design reuse is prioritized over size/efficiency. |
| MIC24045-5.0WU | 4MHz synchronous buck; 5V/4A output; integrated MOSFETs; ±1% output accuracy; requires external compensation. | Higher frequency enables ultra-small 1µH inductors but demands tighter layout control and higher gate-drive loss management. | Choose MIC24045-5.0WU for next-gen compact designs needing >3A, tighter regulation, or faster transient response-accepting increased design complexity. |
Compared with LM2576-5.0, MIC4576-5.0WU-TR cuts inductor size by ~50% and improves output accuracy; compared with MIC24045-5.0WU, it trades higher efficiency at medium loads for simpler layout, no external compensation, and proven robustness in industrial environments.
Availability
MIC4576-5.0WU-TR is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded microprocessor core rails, on-card DC-DC converters, and battery charger pre-regulators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4576-5.0WU-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 family was designed as a drop-in upgrade to LM2576 for engineers seeking higher switching frequency, tighter output tolerance, and TO-263 surface-mount compatibility-targeting cost-sensitive, high-reliability industrial power applications.
FAQ
What is the maximum input voltage rating for MIC4576-5.0WU-TR?
The MIC4576-5.0WU-TR has an absolute maximum input voltage rating of +40V, with recommended continuous operation up to +36V. Exceeding +36V risks permanent damage even briefly. The device is specified for stable 5.0V output across 8V–36V input, making it ideal for 12V/24V industrial bus systems. Always include input transient protection if surge exposure is possible.
Does MIC4576-5.0WU-TR require external feedback resistors?
No, MIC4576-5.0WU-TR does not require external feedback resistors. As a fixed 5.0V version, its internal resistive divider connects the FB pin directly to the output. Pin 4 (FB) must be connected to the regulated 5V output node-no resistors, no trimming. This simplifies layout and eliminates resistor tolerance errors affecting output accuracy.
What thermal performance can be expected from MIC4576-5.0WU-TR in TO-263 package?
MIC4576-5.0WU-TR in TO-263 (U) package has θJC = 2°C/W and θJA = 65°C/W. With a 2 cm² copper pour under the thermal tab, junction-to-ambient rise is typically <30°C at 3A/5V output. Full 3A load is sustainable at +85°C ambient if PCB copper area ≥4 cm² and airflow ≥200 LFM-no external heatsink required in most industrial applications.
Can MIC4576-5.0WU-TR be used in negative-output (inverting) configurations?
Yes, MIC4576-5.0WU-TR supports inverting buck-boost topology to generate negative voltages. When configured as a positive-to-negative converter, it delivers regulated -5V output using standard external components (inductor, diode, caps). The datasheet confirms this application in Figure 4-7 and lists "Positive-to-Negative Converter" explicitly under Applications.
Is MIC4576-5.0WU-TR pin-compatible with LM2576-5.0?
Yes, MIC4576-5.0WU-TR shares identical pinout and function with LM2576-5.0 in TO-220 (T) variants, and the TO-263 (U) variant maintains functional equivalence with adapted layout. Both use VIN, SW, GND, FB, SHDN in same order. However, MIC4576-5.0WU-TR operates at 200 kHz vs. 52 kHz, requiring inductor and capacitor value adjustments-not a blind drop-in replacement without re-optimizing passive components.
MIC4576-5.0WU-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):
- 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
MIC4576-5.0WU-TR FAQ
1.How can I place an order for MIC4576-5.0WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576-5.0WU-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 MIC4576-5.0WU-TR reliable?
The price and inventory of MIC4576-5.0WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4576-5.0WU-TR is usually 5 days.
3.What payment methods are accepted for MIC4576-5.0WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576-5.0WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576-5.0WU-TR?
MIC4576-5.0WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576-5.0WU-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 MIC4576-5.0WU-TR?
For technical support, including MIC4576-5.0WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576-5.0WU-TR requirements.
6.How does Aetrix verify that MIC4576-5.0WU-TR is sourced from the original manufacturer or authorized distributors?
All MIC4576-5.0WU-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 MIC4576-5.0WU-TR meets industry standards.
7.What is the process for return or replacement of MIC4576-5.0WU-TR?
All MIC4576-5.0WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576-5.0WU-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 MIC4576-5.0WU-TR part is unused and in its original packaging.
Return procedure for MIC4576-5.0WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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