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Microchip Technology MIC4576-5.0BU
- Part No.:
- MIC4576-5.0BU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4576-5.0BU.pdf
- Description:
- IC REG BUCK 5V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,285
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Product details
Overview
MIC4576-5.0BU 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 - used in industrial power supplies, microprocessor core rails, and battery-powered systems requiring high-efficiency DC-DC conversion.
For engineers reviewing the MIC4576-5.0BU datasheet, MIC4576-5.0BU pinout, MIC4576-5.0BU application, or MIC4576-5.0BU equivalent, key selection criteria include guaranteed 3A switch current, TO-263 (DDPAK) package thermal performance, shutdown current <200 µA, and compatibility with standard inductors at reduced size versus LM2576.
Technical Context
The MIC4576-5.0BU integrates a BiCMOS NPN power switch, 1.23V bandgap reference, error amplifier, and 200 kHz oscillator to deliver fixed 5.0V output via internal resistive feedback divider. It operates across –40°C to +85°C and uses cycle-by-cycle current limiting and thermal shutdown for fault protection.
Its control architecture compares feedback voltage against the 1.23V reference using a fixed-gain error amplifier; the resulting signal modulates duty cycle against a 200 kHz sawtooth waveform. The device requires no external compensation and supports simple PCB layout with minimal external components.
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 rail for microprocessors and FPGAs. |
| Switch Current | Guaranteed 3A peak switch current - supports continuous 3A output with margin for transient loads. |
| Input Range | 4V to 36V unregulated input - enables direct operation from 12V/24V industrial buses or wide-range battery inputs. |
| Switching Frequency | 200 kHz ±10% - allows ~2× smaller output inductor than 52 kHz LM2576, reducing board area and cost. |
| Shutdown Current | <200 µA typical - enables low-power standby modes in battery-backed or energy-sensitive applications. |
| Thermal Resistance | θJC = 2°C/W (TO-263) - delivers high power dissipation capability with efficient heatsinking through exposed tab. |
| Protection Features | Thermal shutdown + cycle-by-cycle overcurrent limiting - prevents damage during short-circuit or overload conditions without external circuitry. |
Pinout & Package
The MIC4576-5.0BU is housed in a 5-lead TO-263 (DDPAK) package with exposed thermal pad (Tab = GND), optimized for high-current thermal performance in industrial environments.
| 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 and Schottky diode; high dv/dt node requiring tight layout and ground plane. |
| 3, Tab. GND | Power and signal ground | Common return for input/output capacitors, feedback, and shutdown; tab provides primary thermal path. |
| 4. FB | Feedback input | Internally connected to 5.0V divider; connect directly to output for regulation - no external resistor needed. |
| 5. SHDN | Logic-level shutdown enable | TTL-compatible: ≤0.8V disables regulator (ISD <200 µA); ≥2.4V enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output with ±3% tolerance | Eliminates need for external feedback resistors and associated layout sensitivity or drift errors. |
| 200 kHz switching frequency | Enables use of standard 33 µH inductors - 25% value of typical LM2576 designs - reducing size, cost, and EMI filter complexity. |
| Integrated thermal and overcurrent protection | Self-protecting under fault conditions; no external sensing or latch circuitry required for robust system design. |
| TO-263 (DDPAK) package with θJC = 2°C/W | Supports >3A continuous operation with minimal heatsink; exposed tab simplifies thermal management on PCB. |
| Low shutdown current (<200 µA) | Extends battery life in portable equipment and enables clean power sequencing in multi-rail systems. |
Applications
| Industrial Power Supply | Microprocessor Core Rail |
|---|---|
Use Scenario: Converting 24V factory bus to regulated 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V/3A with high efficiency and thermal resilience. Use Value: Eliminates need for linear post-regulation; maintains regulation across wide input transients common in industrial environments. | Use Scenario: Providing 5V VCC for Intel Pentium™-class microprocessors and companion logic in embedded controllers. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter meeting tight voltage accuracy (±3%) and fast transient response requirements. Use Value: Ensures reliable boot and operation under varying load conditions without external compensation. |
| Battery-Powered Equipment | Negative Boost Converter |
Use Scenario: Stepping down 9–36V Li-ion or lead-acid battery packs to 5V for portable instrumentation and telemetry units. IC Role / Device Role / Timing Role: High-efficiency buck regulator enabling extended runtime and low thermal signature in sealed enclosures. Use Value: 77% typical efficiency at 3A reduces heat generation and extends usable battery capacity. | Use Scenario: Generating negative output from positive input in analog front-ends and op-amp bias networks. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using same external components as standard buck. Use Value: Leverages fixed 5.0V feedback structure to simplify negative rail design without adding IC count. |
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 in TO-220 package (θJA = 65°C/W vs. TO-263's 65°C/W; θJC = 2°C/W identical); taller profile, through-hole mounting. | Preferred for prototyping or low-volume through-hole assembly; less suitable for high-density SMT production. | Select MIC4576-5.0WT when manual soldering or legacy board compatibility is required. |
| LM2576-5.0 | 52 kHz switching frequency, larger inductor requirement (≈2×), ±4% output tolerance, higher quiescent current (~5 mA vs. 5–10 mA active, <200 µA shutdown). | Legacy drop-in replacement where board space and efficiency are secondary to long-term availability and known reliability. | Choose LM2576-5.0 only if redesign is impractical; MIC4576-5.0BU offers superior efficiency, smaller magnetics, and tighter regulation. |
Compared with MIC4576-5.0WT and LM2576-5.0, the MIC4576-5.0BU delivers identical regulation performance in a surface-mount TO-263 package with superior thermal resistance to case, enabling higher ambient temperature operation and simplified thermal design in compact layouts.
Availability
MIC4576-5.0BU is available at Aetrix Electronics and suitable for industrial power supplies, microprocessor core rails, and battery-powered equipment requiring stable component supply, RoHS-compliant packaging, and long-lifecycle support.
Supply support for MIC4576-5.0BU 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 leading provider of microcontrollers, analog devices, and power management ICs, serving industrial, automotive, and consumer markets with high-reliability semiconductor solutions.
The MIC4576 family was designed as a pin-compatible, higher-frequency upgrade to the LM2576 for engineers seeking improved efficiency, smaller passive components, and enhanced thermal performance in fixed-output buck regulator applications.
FAQ
What is the maximum input voltage rating for the MIC4576-5.0BU?
The MIC4576-5.0BU has an absolute maximum input voltage rating of +40V, with recommended operating input range of +4V to +36V. Exceeding +36V may reduce reliability or trigger overvoltage stress; sustained operation above +36V is not guaranteed per datasheet specifications. Always include input transient protection when used in noisy industrial environments.
Does the MIC4576-5.0BU require external feedback resistors?
No, the MIC4576-5.0BU does not require external feedback resistors. It is a fixed 5.0V output variant with an internal resistive divider connected to the FB pin. The FB pin must be connected directly to the regulated 5V output node to close the control loop - no external components are needed for voltage setting.
What package type is used for the MIC4576-5.0BU?
The MIC4576-5.0BU uses a 5-lead TO-263 (also known as DDPAK) package with an exposed thermal pad that serves as the GND terminal. This surface-mount package provides low thermal resistance (θJC = 2°C/W) and is optimized for high-current, high-efficiency applications in space-constrained industrial PCBs.
How does the shutdown function operate on the MIC4576-5.0BU?
The SHDN pin on the MIC4576-5.0BU is TTL-compatible: applying ≤0.8V disables the regulator (reducing current draw to <200 µA), while ≥2.4V enables normal operation. The threshold voltages are VSDTH_ON = 1.2V and VSDTH_OFF = 1.4V, providing noise margin. Leaving SHDN unconnected defaults to enabled via internal pull-up.
Can the MIC4576-5.0BU be used in a negative-output configuration?
Yes, the MIC4576-5.0BU can be configured as a negative-output inverting buck-boost converter by repositioning the inductor and diode. Its fixed 5.0V feedback structure remains valid, and the datasheet explicitly lists "Positive-to-Negative Converter" as a supported application. External component selection must follow Microchip AN14 design guidelines for stability and efficiency.
MIC4576-5.0BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC4576-5.0BU FAQ
1.How can I place an order for MIC4576-5.0BU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576-5.0BU 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 reliable?
The price and inventory of MIC4576-5.0BU 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 is usually 5 days.
3.What payment methods are accepted for MIC4576-5.0BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576-5.0BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576-5.0BU?
MIC4576-5.0BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576-5.0BU 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?
For technical support, including MIC4576-5.0BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576-5.0BU requirements.
6.How does Aetrix verify that MIC4576-5.0BU is sourced from the original manufacturer or authorized distributors?
All MIC4576-5.0BU 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 meets industry standards.
7.What is the process for return or replacement of MIC4576-5.0BU?
All MIC4576-5.0BU units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576-5.0BU, 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 part is unused and in its original packaging.
Return procedure for MIC4576-5.0BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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