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Microchip Technology MIC4576-5.0WU
- Part No.:
- MIC4576-5.0WU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4576-5.0WU.pdf
- Description:
- IC REG BUCK 5V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,343
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Product details
Overview
MIC4576-5.0WU from Microchip Technology is a fixed-output 5.0V, 3A synchronous step-down (buck) switching regulator in a 5-pin TO-263 (DDPAK) package, operating at 200 kHz with ±3% output voltage accuracy over 8V–36V input and full load range, designed for high-efficiency onboard DC/DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the MIC4576-5.0WU datasheet, MIC4576-5.0WU pinout, MIC4576-5.0WU application, or MIC4576-5.0WU equivalent, this page delivers verified electrical specs, thermal performance data, real-world efficiency curves, shutdown logic thresholds, and validated alternative parts for buck converter design validation and BOM optimization.
Technical Context
The MIC4576-5.0WU 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 versus adjustable variants.
It operates across –40°C to +85°C junction temperature, supports 4V–36V input, delivers up to 3A continuous output, and achieves 77% typical efficiency at 3A load with 8V–36V input-enabling compact designs using standard 33 µH inductors instead of larger LM2576-compatible values.
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 microprocessor core rail without external resistor network. |
| Switching Frequency | 200 kHz ±10% - enables smaller output filter inductors (e.g., 33 µH vs. 68 µH for LM2576) and reduces EMI fundamental frequency. |
| Max Output Current | 3A continuous - supports single-rail powering of FPGA I/O banks, DSP peripherals, or industrial sensors without derating at 85°C ambient. |
| Input Voltage Range | 4V to 36V - accommodates wide-input industrial 12/24V systems, battery-backed equipment, and automotive off-battery applications. |
| Shutdown Current | <200 µA typical - allows low-power sleep mode in portable instrumentation or remote monitoring nodes. |
| Thermal Resistance | θJC = 2°C/W - enables direct heatsink mounting on tab for >2W dissipation without thermal throttling in TO-263 package. |
| Efficiency | 77% typical at 3A, VIN = 12V - reduces heat generation by ~30% versus legacy 52 kHz buck regulators under identical load conditions. |
Pinout & Package
Package: 5-Lead TO-263 (DDPAK), surface-mount, thermally enhanced with exposed metal tab (Pin 3/TAB = GND). RoHS-compliant, industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated Input Supply | Accepts 4V–36V DC; requires ≥470 µF/63V bulk capacitor to limit ripple-induced switching noise and ensure stability. |
| SW (Pin 2) | Power Switch Node | Drives external inductor (e.g., 33 µH); connects to cathode of Schottky diode (e.g., MBR360); high dv/dt node requiring tight loop layout. |
| GND (Pin 3 / TAB) | Power & Signal Ground Reference | Primary return path for switch current and feedback; tab must be soldered to large copper pour for thermal conduction and low-impedance grounding. |
| FB (Pin 4) | Internal Feedback Tap | Internally connected to 5.0V divider; shorted directly to output for fixed operation - no external resistors required. |
| SHDN (Pin 5) | Logic-Controlled Enable | TTL-compatible input: ≤0.8V = ON, ≥2.4V = OFF; draws ≤30 µA when active; pull-down recommended if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V Output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±3% regulation across line/load/temperature. |
| 200 kHz Switching | Enables use of standard 33 µH inductors - 25% of typical LM2576 values - cutting solution size and cost without compromising efficiency. |
| Integrated Protection | Combines cycle-by-cycle current limiting (5.2A peak), thermal shutdown (150°C), and <200 µA shutdown current for robust fault recovery in unattended systems. |
| TO-263 Thermal Performance | θJC = 2°C/W allows >2W continuous power dissipation with minimal heatsinking - critical for space-constrained industrial PCBs. |
| Wide Input Range | 4V–36V operation supports direct connection to 12V/24V rails, battery inputs (e.g., 3S Li-ion), and variable-output SMPS pre-regulators. |
Applications
| Industrial Power Supply | Embedded Microprocessor Core Rail |
|---|---|
|
Use Scenario: On-board 24V-to-5V conversion for PLC I/O modules with 3A peak current demand during analog sensor excitation. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5.0V to microcontroller, ADC, and digital isolators. Use Value: Fixed output eliminates resistor tolerance errors; 200 kHz switching reduces output capacitor ESR requirements and improves transient response to step loads. |
Use Scenario: Powering Intel Pentium™-class microprocessors requiring clean, stable 5V at up to 3A during burst-mode execution. IC Role / Device Role / Timing Role: High-current step-down regulator with fast load-step recovery enabled by internal compensation and low-ESR output capacitance support. Use Value: ±3% output accuracy ensures compliance with processor VCC tolerance; TO-263 thermal performance sustains full load without thermal throttling. |
| Battery-Powered Test Equipment | Positive-to-Negative Converter |
|
Use Scenario: Portable multimeter with 3S Li-ion battery (9–12.6V) powering 5V analog front-end and display controller. IC Role / Device Role / Timing Role: Efficient preregulator stepping down battery voltage to fixed 5V before LDO post-regulation. Use Value: 77% typical efficiency extends battery life; shutdown current <200 µA enables deep-sleep modes with negligible quiescent drain. |
Use Scenario: Generating –5V rail from +12V supply for op-amp biasing in signal conditioning circuits. IC Role / Device Role / Timing Role: Inverting buck-boost topology using MIC4576-5.0WU's SW node as controlled switch and GND as virtual ground reference. Use Value: Pin-compatible reuse of existing 5V buck layout; same 200 kHz frequency simplifies EMI filtering across both positive and negative rails. |
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, TO-220 only, ±4% output tolerance, higher inductor values required (68 µH typical) | Larger solution size, lower efficiency (~68%), limited to through-hole assembly | Choose for legacy compatibility where board space and efficiency are secondary to proven reliability. |
| MIC4576-5.0WT | Identical electrical specs but in TO-220 package; θJA = 65°C/W vs. TO-263's 65°C/W (same air rating), but θJC = 2°C/W only in TO-263 | Requires vertical heatsinking; less suitable for dense SMT layouts; same thermal limits only with adequate airflow | Choose for manual assembly or prototyping where TO-220 footprint is already allocated. |
Compared with LM2576-5.0 and MIC4576-5.0WT, the MIC4576-5.0WU delivers identical regulation accuracy and current capability in a surface-mount package with superior thermal resistance to case (2°C/W), enabling higher power density and simplified thermal management in automated production.
Availability
MIC4576-5.0WU is available at Aetrix Electronics and suitable for industrial power supplies, embedded microprocessor core rails, battery-powered test equipment, and positive-to-negative converter designs requiring stable component supply and long-term manufacturability.
Supply support for MIC4576-5.0WU 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 series was developed as a drop-in upgrade to the LM2576, delivering higher switching frequency, tighter output tolerance, and improved thermal performance in modern surface-mount packages for next-generation power conversion.
FAQ
What is the maximum input voltage for MIC4576-5.0WU?
The MIC4576-5.0WU supports an absolute maximum input voltage of +40V, with recommended continuous operation up to +36V. Exceeding +36V may trigger internal protection or reduce reliability. The device is rated for 4V–36V normal operation, making it suitable for 24V industrial rails and 3S Li-ion battery inputs.
Does MIC4576-5.0WU require external feedback resistors?
No, MIC4576-5.0WU does not require external feedback resistors. It is a fixed 5.0V output variant with an internal resistive divider connected to the FB pin, which must be tied directly to the output. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like MIC4576WT.
What is the thermal resistance of MIC4576-5.0WU in TO-263 package?
The MIC4576-5.0WU in TO-263 (U) package has θJC = 2°C/W (junction-to-case) and θJA = 65°C/W (junction-to-ambient). The low θJC enables efficient heat transfer to an external heatsink mounted on the exposed tab, supporting >2W continuous dissipation without thermal shutdown at +85°C ambient.
Can MIC4576-5.0WU be used in inverting buck-boost topology?
Yes, MIC4576-5.0WU can be configured as a positive-to-negative converter. By grounding the FB pin and referencing the output to the SW node, the device generates a regulated –5.0V rail from a +12V input. Application Figure 4-6 in DS20006158A validates this configuration with appropriate external components.
What is the shutdown logic threshold for MIC4576-5.0WU?
The MIC4576-5.0WU SHDN pin turns the regulator ON when voltage is ≤0.8V and OFF when ≥2.4V. The turn-on threshold is guaranteed at 1.2V and turn-off at 1.4V, providing 0.2V hysteresis. Pulling SHDN to GND enables operation; leaving it open is not recommended due to potential noise coupling.
MIC4576-5.0WU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC4576-5.0WU FAQ
1.How can I place an order for MIC4576-5.0WU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576-5.0WU 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 reliable?
The price and inventory of MIC4576-5.0WU 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 is usually 5 days.
3.What payment methods are accepted for MIC4576-5.0WU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576-5.0WU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576-5.0WU?
MIC4576-5.0WU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576-5.0WU 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?
For technical support, including MIC4576-5.0WU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576-5.0WU requirements.
6.How does Aetrix verify that MIC4576-5.0WU is sourced from the original manufacturer or authorized distributors?
All MIC4576-5.0WU 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 meets industry standards.
7.What is the process for return or replacement of MIC4576-5.0WU?
All MIC4576-5.0WU units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576-5.0WU, 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 part is unused and in its original packaging.
Return procedure for MIC4576-5.0WU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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