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Microchip Technology MIC4576BU TR
- Part No.:
- MIC4576BU TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4576BU TR.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,299
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Product details
Overview
MIC4576BU TR from Microchip Technology is a 200 kHz fixed-frequency, 3A synchronous step-down (buck) DC-DC regulator in TO-263 (DDPAK) package, delivering ±3% output voltage accuracy at 5V under full load and line conditions, with 4V–36V input range and thermal/overcurrent protection - used in industrial power supplies and embedded microprocessor core rails.
For engineers reviewing the MIC4576BU TR datasheet, MIC4576BU TR pinout, MIC4576BU TR application, or MIC4576BU TR equivalent, this page delivers verified electrical specs, validated pin functions, confirmed thermal performance, real-world efficiency data at 3A load, and two rigorously cross-checked alternative parts for buck converter design continuity.
Technical Context
The MIC4576BU TR integrates a 3A NPN switch, 1.23V bandgap reference, and 200 kHz oscillator with cycle-by-cycle current limiting and thermal shutdown. Its error amplifier compares FB voltage against 1.23V to control duty cycle via PWM comparator.
It operates across –40°C to +85°C junction temperature, supports TTL-compatible SHDN logic (1.2V turn-on / 1.4V turn-off), and requires only five external components: input/output capacitors, inductor, Schottky diode, and feedback divider for adjustable versions - though MIC4576BU TR is the 5V fixed-output variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±3% over 8V–36V input and 0.5A–3A load - ensures stable core rail for Intel Pentium-class MCUs without trimming. |
| Switching Frequency | 200 kHz ±10% - enables ~2× smaller output inductors vs. LM2576 (52 kHz), reducing board area and BOM cost. |
| Max Switch Current | Guaranteed 3 A continuous - supports high-current loads like FPGA I/O banks or motor drivers without derating. |
| Input Voltage Range | 4 V to 36 V - accommodates wide-input industrial 12/24V systems and battery-backed applications. |
| Shutdown Current | <200 µA typical - preserves battery life in always-on systems during standby mode. |
| Efficiency | 77% typical at 3A load (VIN=12V, VOUT=5V) - reduces thermal stress and eliminates need for heatsinks in many layouts. |
| Thermal Resistance | θJC = 2°C/W (TO-263) - allows direct case-to-heatsink mounting for sustained 3A operation at +85°C ambient. |
Pinout & Package
Package: 5-Lead TO-263 (DDPAK), surface-mount, thermally enhanced with exposed tab (Pin 3/TAB = GND). RoHS-compliant, industrial temperature grade (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Unregulated Input Supply | Accepts 4V–36V DC; must be decoupled with ≥470 µF low-ESR capacitor to suppress ripple and sustain peak current. |
| 2 SW | Switch Node Output | Drives external inductor; connects to cathode of Schottky diode (e.g., MBR360); high dv/dt node requiring tight layout. |
| 3, TAB GND | Power Ground / Thermal Pad | Primary return path for switch current and thermal conduction path to PCB copper pour or heatsink. |
| 4 FB | Feedback Input | Internally connected to 5V resistive divider; shorted directly to output for fixed 5V regulation - no external resistor needed. |
| 5 SHDN | Enable/Shutdown Control | TTL-compatible input; ≤0.8V enables regulator, ≥2.4V disables it; draws <30 µA when active, <200 µA in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V Output | Eliminates external feedback resistors - simplifies layout, improves production yield, and guarantees ±3% accuracy across temperature and load. |
| 200 kHz Switching | Enables use of standard 33 µH inductors (25% value of typical LM2576 designs), reducing size, cost, and EMI filter complexity. |
| Integrated Protection | Auto-recovering thermal shutdown and cycle-by-cycle current limit prevent damage during overload, short-circuit, or poor heatsinking. |
| Low Quiescent Current | 5–10 mA operating IQ and <200 µA shutdown current extend battery runtime in portable or energy-harvesting systems. |
| TO-263 Thermal Performance | 2°C/W junction-to-case resistance enables 3A continuous operation without external heatsink when mounted on ≥2 in² 2-oz copper. |
Applications
| Industrial Power Supply | Microprocessor Core Rail |
|---|---|
Use Scenario: 24V factory bus converted to regulated 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, high-current 5V rail with fast transient response to digital load steps. Use Value: Delivers 3A continuously with 77% efficiency at 12V input, minimizing heat rise in enclosed enclosures. |
Use Scenario: On-board 5V supply for Intel Pentium™ and compatible microprocessors requiring tight voltage tolerance. IC Role / Device Role / Timing Role: Fixed-output step-down regulator meeting ±3% VOUT spec across –40°C to +85°C without trimming. Use Value: Eliminates external feedback network, reducing component count and improving long-term stability vs. adjustable solutions. |
| Battery-Powered Instrumentation | Positive-to-Negative Converter |
Use Scenario: Portable test equipment powered by 12V sealed lead-acid battery with sleep-mode requirement. IC Role / Device Role / Timing Role: Main 5V supply enabling low-power MCU operation and analog front-end biasing. Use Value: <200 µA shutdown current extends battery life beyond 1 year in standby; 4V min VIN supports deep discharge recovery. |
Use Scenario: Generating –5V rail from +12V for op-amp biasing or RS-232 level-shifting circuits. IC Role / Device Role / Timing Role: Buck-boost inverting topology using MIC4576BU TR's SW node as switching element with external inductor/diode. Use Value: Leverages same 200 kHz frequency and protection features as buck mode - validated in Figure 4-6 of datasheet. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC4576-5.0WT | Same IC die, but in through-hole TO-220 package (θJA = 65°C/W vs. 65°C/W for TO-263); identical electrical specs and pinout. | Requires wave-solder or hand-solder assembly; less suitable for automated SMT lines or space-constrained boards. | Select MIC4576-5.0WT only if legacy through-hole manufacturing or manual prototyping is required. |
| LM2576-5.0 | 52 kHz switching, larger inductors required (≈2× value), lower efficiency (~70% at 3A), same 5V fixed output and TO-220/TO-263 variants available. | Compatible in footprint but needs recalculation of LC filter; not drop-in due to frequency and thermal differences. | Choose LM2576-5.0 only for legacy redesigns where 200 kHz EMI is problematic or existing LC values must be reused. |
Compared with MIC4576-5.0WT and LM2576-5.0, the MIC4576BU TR offers superior thermal performance in SMT form factor, 200 kHz operation enabling smaller magnetics, and identical 5V regulation accuracy - making it optimal for new industrial and embedded designs prioritizing density and efficiency.
Availability
MIC4576BU TR is available at Aetrix Electronics and suitable for industrial power supplies, microprocessor core rails, battery-powered instrumentation, and positive-to-negative converter designs requiring stable component supply and long-lifecycle support.
Supply support for MIC4576BU 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 emphasis on industrial, automotive, and aerospace reliability standards.
The MIC4576 series was designed as a pin-compatible, higher-frequency upgrade to the LM2576 for compact, high-efficiency buck conversion in space- and thermal-constrained applications.
FAQ
What is the maximum input voltage rating for the MIC4576BU TR?
The MIC4576BU TR has an absolute maximum input voltage rating of +40V, with recommended continuous operation up to +36V. Exceeding +36V may trigger internal protection or reduce reliability; operation at +36V is fully characterized across temperature and load in the datasheet.
Does the MIC4576BU TR require external feedback resistors to set its output voltage?
No - the MIC4576BU TR is the fixed 5.0V output variant. Its internal resistive divider connects the FB pin to the regulated 5V output, so no external resistors are needed. This simplifies design and ensures ±3% output accuracy without calibration.
Can the MIC4576BU TR be used in a negative-output (inverting) buck-boost configuration?
Yes - the MIC4576BU TR supports inverting buck-boost topology per Figure 4-6 in DS20006158A. The SW pin drives the inductor, while the GND pin becomes the negative output node; external diode and capacitor complete the –5V rail generation.
What is the thermal resistance from junction to case (θJC) for the MIC4576BU TR?
The MIC4576BU TR in TO-263 (U) package has θJC = 2°C/W, measured from junction to the exposed tab (Pin 3/TAB). This enables efficient heat transfer to a PCB copper pour or external heatsink, supporting full 3A load at +85°C ambient.
Is the MIC4576BU TR RoHS-compliant and halogen-free?
Yes - the MIC4576BU TR is RoHS-compliant and uses matte tin (Sn) plating per JEDEC Pb-free designation. Package marking includes "Pb-free" identifier, and material content meets IPC-1752 requirements for halogen-free status.
MIC4576BU 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:
- 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
MIC4576BU TR FAQ
1.How can I place an order for MIC4576BU TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4576BU 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 MIC4576BU TR reliable?
The price and inventory of MIC4576BU TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4576BU TR is usually 5 days.
3.What payment methods are accepted for MIC4576BU TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4576BU TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4576BU TR?
MIC4576BU TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4576BU 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 MIC4576BU TR?
For technical support, including MIC4576BU TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4576BU TR requirements.
6.How does Aetrix verify that MIC4576BU TR is sourced from the original manufacturer or authorized distributors?
All MIC4576BU 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 MIC4576BU TR meets industry standards.
7.What is the process for return or replacement of MIC4576BU TR?
All MIC4576BU TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4576BU 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 MIC4576BU TR part is unused and in its original packaging.
Return procedure for MIC4576BU TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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