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Microchip Technology MIC4576WU-TR
- Part No.:
- MIC4576WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4576WU-TR.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,942
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Product details
Overview
MIC4576WU-TR from Microchip Technology is a 5-pin TO-263 (DDPAK) adjustable-output synchronous buck regulator delivering up to 3A continuous output current, operating at a fixed 200 kHz switching frequency with ±10% tolerance, supporting 4V–36V input and 1.23V–33V output ranges, and featuring thermal shutdown and cycle-by-cycle overcurrent protection for industrial power conversion applications.
For engineers reviewing the MIC4576WU-TR datasheet, MIC4576WU-TR pinout, MIC4576WU-TR application, or MIC4576WU-TR equivalent, this page provides verified technical context, confirmed pin functions, real-world efficiency data (≥77% typical at 3A), validated alternative options, and precise package-level design meaning for layout and thermal management.
Technical Context
The MIC4576WU-TR implements a BiCMOS-based fixed-frequency PWM architecture with internal 1.23V bandgap reference and error amplifier, comparing feedback voltage against that reference to control duty cycle via sawtooth oscillator comparison. It integrates a 3A NPN switch with 1.7–2.3V saturation voltage at full load.
Shutdown is TTL-compatible with 1.2V turn-on and 1.4V turn-off thresholds, drawing ≤200 µA in shutdown mode. Frequency compensation is fully internal, requiring no external capacitor - enabling minimal BOM count with only inductor, diode, and two capacitors for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 200 kHz ±10% - enables use of smaller inductors (≈50% size reduction vs LM2576) and reduces output filter footprint. |
| Output Current | Guaranteed 3A DC - supports high-current loads without derating under industrial temperature range (–40°C to +85°C). |
| Input Voltage Range | 4V to 36V - accommodates wide-range unregulated supplies including 12V/24V automotive and industrial rails. |
| Output Voltage Range | 1.23V to 33V adjustable - set via external resistor divider; feedback voltage tolerance ±2% ensures tight regulation across line/load. |
| Efficiency | ≥77% typical at 3A - measured at VOUT = 5V, VIN = 12V; higher than fixed-output variants due to optimized feedback path. |
| Thermal Protection | Thermal shutdown with 100% electrical burn-in - junction limit +150°C; θJC = 2°C/W enables direct heatsink mounting via exposed tab. |
| Shutdown Current | ≤200 µA - allows low-power system sleep modes without compromising fast wake-up response. |
Pinout & Package
Package: 5-Lead TO-263 (DDPAK), thermally enhanced surface-mount package with exposed metal tab (Pin 3/TAB = GND) for direct PCB heatsinking; JEDEC-compliant Pb-free matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply connection | Accepts 4–36V DC; requires local 470 µF/63V bulk capacitor to suppress ripple and support peak current delivery. |
| SW (Pin 2) | Switch node output | Drives external inductor; connects to cathode of Schottky diode (e.g., MBR360); high dv/dt node requiring tight layout and ground plane coupling. |
| GND / TAB (Pins 3 & TAB) | Power and signal reference ground | Exposed metal tab is electrically connected to Pin 3; must be soldered to large copper pour for thermal conduction and low-impedance return path. |
| FB (Pin 4) | Feedback input | Connects to 1.23V tap of resistive divider; 50–100 nA bias current enables high-resistance dividers without significant error. |
| SHDN (Pin 5) | Enable/disable logic input | TTL-compatible; <1.2V enables regulator, >2.4V disables; internal pull-down not provided - requires explicit grounding if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 200 kHz oscillator | Enables predictable EMI profile and consistent inductor sizing; eliminates need for external timing components. |
| Internal frequency compensation | Removes requirement for external compensation capacitor - simplifies design and improves stability across all output configurations. |
| 3A integrated NPN switch | Eliminates need for external MOSFET driver; saturation voltage ≤2.3V at 3A reduces conduction loss versus discrete solutions. |
| Thermal shutdown + overcurrent protection | Self-protecting under short-circuit or overload; latches off until reset by cycling SHDN or input power - prevents device damage during fault conditions. |
| Adjustable output (1.23V–33V) | Single part number supports wide range of system voltages; feedback tolerance ±2% ensures accuracy without trimming. |
Applications
| Industrial 24V-to-12V Conversion | Embedded System Preregulator |
|---|---|
Use Scenario: Converting 24V factory bus to stable 12V for motor drivers and I/O modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing regulated 12V/3A output with minimal external components. Use Value: High efficiency (>75%) reduces heat generation in enclosed cabinets; TO-263 thermal performance enables convection-only cooling. |
Use Scenario: Generating 5V intermediate rail from 12V supply before LDO post-regulation for MCU core voltage. IC Role / Device Role / Timing Role: Efficient preregulator reducing dropout across downstream linear regulator, lowering total power dissipation. Use Value: 200 kHz operation allows compact 33 µH inductor; combined with low quiescent current (<10 mA), extends system standby time. |
| Negative Boost Converter | Battery-Powered Instrumentation Supply |
Use Scenario: Generating –5V rail from +5V microcontroller supply for analog front-end op-amps. IC Role / Device Role / Timing Role: Configured as inverting buck-boost to deliver negative output using standard external components. Use Value: Adjustable feedback reference enables precise negative voltage setting; shutdown mode draws <200 µA, preserving battery life. |
Use Scenario: Powering portable test equipment with Li-ion battery (3.0–4.2V) requiring stable 3.3V for ADC and sensors. IC Role / Device Role / Timing Role: Wide-input buck regulator maintaining regulation down to 4V input while delivering 3.3V/3A. Use Value: Input range starts at 4V - supports operation through full battery discharge curve; ±2% FB tolerance ensures sensor accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVS-ADJ | 52 kHz switching frequency; larger inductor required (≈2× value); TO-220 only; no shutdown pin. | Limited to lower-frequency designs where EMI constraints allow; unsuitable for space-constrained layouts needing small magnetics. | Select when legacy compatibility or cost sensitivity outweighs size/efficiency gains; verify thermal margin with θJA = 65°C/W. |
| MP2307DN-LF-Z | 340 kHz operation; 2A rated current; SO-8EP package; integrated high-side MOSFET; no SHDN pin in base variant. | Better suited for <2A loads and PCB area-limited designs; lacks dedicated shutdown control and industrial temp rating (–40°C to +125°C). | Prefer for consumer-grade, lower-current applications where footprint is critical; avoid for 3A industrial loads or strict shutdown control needs. |
Compared with LM2576HVS-ADJ and MP2307DN-LF-Z, the MIC4576WU-TR uniquely delivers 3A at 200 kHz in TO-263 with TTL shutdown, combining industrial temperature range, proven reliability, and minimal external component count - making it optimal for ruggedized embedded power stages.
Availability
MIC4576WU-TR is available at Aetrix Electronics and suitable for industrial motor drives, embedded instrumentation, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4576WU-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 series was designed as a drop-in upgrade to LM2576 for higher-efficiency, smaller-footprint buck conversion in industrial power supplies - emphasizing ease-of-use, thermal robustness, and minimal external component count.
FAQ
What is the maximum output current capability of the MIC4576WU-TR?
The MIC4576WU-TR guarantees 3A continuous output current across the full industrial temperature range (–40°C to +85°C), with peak switch current limited to 4.2–7.9A depending on duty cycle and thermal conditions. Derating is required above +70°C ambient per θJA = 65°C/W; actual sustained current depends on PCB copper area and airflow.
Does the MIC4576WU-TR require an external compensation capacitor?
No, the MIC4576WU-TR features fully internal frequency compensation - eliminating the need for external compensation components. This simplifies design, improves stability across all output voltages, and reduces bill-of-materials count compared to controllers requiring external Type II or III compensation networks.
What is the purpose of the exposed metal tab on the MIC4576WU-TR package?
The exposed metal tab on the MIC4576WU-TR (TO-263/DDPAK) is electrically connected to Pin 3 (GND) and serves as the primary thermal conduction path. It must be soldered to a large PCB copper pour or heatsink to achieve the specified θJC = 2°C/W and prevent thermal shutdown during 3A operation.
Can the MIC4576WU-TR be used in a negative-output (inverting) configuration?
Yes, the MIC4576WU-TR supports inverting buck-boost topology to generate negative output voltages. The datasheet confirms this application in Figure 4-7, using standard external components (inductor, diode, capacitors). Feedback is referenced to the negative rail, requiring proper grounding of the FB divider midpoint.
What is the minimum input voltage required for the MIC4576WU-TR to regulate properly?
The MIC4576WU-TR specifies a minimum input voltage of 4V for guaranteed operation. Below this, the internal regulator cannot sustain bias, leading to dropout or oscillation. For 3.3V output applications, ensure VIN ≥ 4.5V to maintain sufficient headroom for switch saturation and loop stability.
MIC4576WU-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 33V
- 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
MIC4576WU-TR FAQ
1.How can I place an order for MIC4576WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576WU-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 MIC4576WU-TR reliable?
The price and inventory of MIC4576WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4576WU-TR is usually 5 days.
3.What payment methods are accepted for MIC4576WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576WU-TR?
MIC4576WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576WU-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 MIC4576WU-TR?
For technical support, including MIC4576WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576WU-TR requirements.
6.How does Aetrix verify that MIC4576WU-TR is sourced from the original manufacturer or authorized distributors?
All MIC4576WU-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 MIC4576WU-TR meets industry standards.
7.What is the process for return or replacement of MIC4576WU-TR?
All MIC4576WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576WU-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 MIC4576WU-TR part is unused and in its original packaging.
Return procedure for MIC4576WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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