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Microchip Technology MIC4575-3.3BU TR
- Part No.:
- MIC4575-3.3BU TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4575-3.3BU TR.pdf
- Description:
- IC REG BCK BST 3.3V 1.7A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,197
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Product details
Overview
MIC4575-3.3BU TR from Microchip Technology is a fixed-output 3.3V, 1A synchronous step-down (buck) DC-DC regulator with 200 kHz switching frequency, ±3% output voltage accuracy over 6–24V input and 0.2–1A load, thermal shutdown, and cycle-by-cycle current limiting - used in embedded power rails for microprocessors including Intel Pentium.
For engineers reviewing the MIC4575-3.3BU TR datasheet, MIC4575-3.3BU TR pinout, MIC4575-3.3BU TR application, or MIC4575-3.3BU TR equivalent, this page delivers verified electrical specs, package mapping to DDPAK-5, functional block context, real-world use cases, and validated alternative options for industrial and computing power designs.
Technical Context
The MIC4575-3.3BU TR integrates a BiCMOS NPN power switch, 1.23V bandgap reference, error amplifier, and 200 kHz oscillator to implement variable-duty-cycle PWM control. Its internal compensation eliminates external compensation components.
It operates across 4–24V input, delivers regulated 3.3V at up to 1A, and uses cycle-by-cycle current limiting plus thermal shutdown for fault protection. Shutdown mode draws <200 µA, and FB pin is internally tied to output for fixed versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±3% (3.168–3.432V) over 6–24V input and 0.2–1A load - ensures stable core logic rail for microprocessors. |
| Switching Frequency | 200 kHz ±10% - enables smaller inductors vs. 52 kHz LM2575 (up to 2:1 size reduction). |
| Max Output Current | 1A continuous - supports single-rail CPU/core logic loads without external boost. |
| Input Voltage Range | 4V to 24V - accommodates wide-input industrial and battery-backed systems. |
| Efficiency | 72% typical at 1A - reduces thermal load in compact enclosures with minimal heatsinking. |
| Shutdown Current | <200 µA - enables low-power sleep modes in portable or always-on devices. |
| Oscillator Accuracy | ±10% - sufficient for non-critical timing; no external clock required. |
Pinout & Package
Package: 5-Lead DDPAK (U), surface-mount, thermally enhanced with exposed tab (GND-connected), rated for –40°C to +85°C junction temperature and θJA = 65°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Unregulated Input Supply | Accepts 4–24V DC; must be decoupled with ≥22 µF ceramic or low-ESR electrolytic. |
| 2 - SW | Switch Node Output | Drives external inductor and Schottky diode; high dv/dt node requiring tight layout. |
| 3 & Tab - GND | Power and Thermal Ground | Primary return path for switch current and thermal dissipation; requires large copper pour. |
| 4 - FB | Feedback Input | Internally connected to output for fixed 3.3V version; no external divider needed. |
| 5 - SHDN | Enable/Shutdown Control | TTL-compatible input; ≤1.0V enables, ≥2.4V disables regulator with <200 µA quiescent draw. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V Output | Eliminates external feedback resistors - simplifies BOM and layout for standard logic rail generation. |
| 200 kHz Switching | Reduces required inductor size by ~50% vs. legacy 52 kHz buck regulators like LM2575. |
| Integrated Protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload or short-circuit events. |
| Low Shutdown Current | <200 µA enables energy-efficient system-level power gating without auxiliary circuitry. |
| Wide Input Range | 4–24V operation supports 5V, 12V, and 24V industrial bus inputs without pre-regulation. |
Applications
| Intel Pentium Core Rail | Industrial PLC I/O Power |
|---|---|
Use Scenario: Generating clean 3.3V supply for Intel Pentium-class microprocessors in embedded computing modules. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated core voltage with fast transient response. Use Value: Meets ±3% output tolerance requirement for Pentium VCCIO while enabling compact 68 µH inductor footprint. |
Use Scenario: Providing isolated 3.3V logic power for digital I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: On-card buck converter converting 24V field bus to low-voltage logic rail. Use Value: Withstands 24V input transients and maintains regulation under 1A pulsed loads typical of solenoid drivers. |
| Battery-Powered Test Equipment | POS Terminal Power Management |
Use Scenario: Efficient 3.3V rail generation from Li-ion (8.4V max) or 9V alkaline battery packs in handheld testers. IC Role / Device Role / Timing Role: Main DC-DC converter enabling >72% efficiency across battery discharge curve. Use Value: Low 200 µA shutdown current extends shelf life; wide input range avoids mid-pack voltage dropouts. |
Use Scenario: Powering 3.3V MCU, display, and USB interface in point-of-sale terminals with 12V wall adapter input. IC Role / Device Role / Timing Role: Primary buck regulator feeding multiple downstream LDOs and peripherals. Use Value: Integrated thermal protection prevents overheating during extended transaction processing under ambient >60°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC4575-3.3WT | Same IC die, TO-220-5 package - higher θJA (65°C/W), through-hole mounting, no exposed thermal tab. | Suitable for prototyping or low-volume boards where thermal mass and manual assembly preferred. | Select MIC4575-3.3WT only when surface-mount constraints or thermal pad routing are impractical. |
| LM2575-3.3 | 52 kHz switching, larger inductor requirement, ±4% output tolerance, no integrated shutdown pin. | Legacy design reuse where board space allows larger magnetics and lower efficiency is acceptable. | Choose LM2575-3.3 only for drop-in replacement in existing LM2575-based layouts - not for new designs. |
Compared with MIC4575-3.3WT, the MIC4575-3.3BU TR offers superior thermal performance via DDPAK's exposed tab and enables automated SMT assembly; versus LM2575-3.3, it delivers tighter regulation, higher efficiency, and active shutdown control - critical for modern low-power embedded systems.
Availability
MIC4575-3.3BU TR is available at Aetrix Electronics and suitable for industrial PLCs, embedded computing modules, battery-powered test equipment, and POS terminal power supplies requiring stable component supply and long-term manufacturability.
Supply support for MIC4575-3.3BU 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 U.S.-based semiconductor company specializing in microcontrollers, analog, and power management ICs, with global manufacturing and quality certifications including ISO 9001 and AEC-Q200 for select products.
The MIC4575 series was designed as a pin-compatible, higher-frequency upgrade to the LM2575 for industrial and computing power conversion - emphasizing ease of use, minimal external components, and robust fault protection.
FAQ
What is the maximum input voltage rating for the MIC4575-3.3BU TR?
The MIC4575-3.3BU TR has an absolute maximum input voltage rating of +40V, but its recommended operating input voltage is +4V to +24V. Operation above +24V is not guaranteed and may cause permanent damage during output short-circuit conditions per Microchip's Absolute Maximum Ratings note.
Does the MIC4575-3.3BU TR require external feedback resistors?
No - the MIC4575-3.3BU TR is a fixed-output variant with internal feedback divider. Pin 4 (FB) is internally connected to the output, so no external resistors are needed. This simplifies design and improves output accuracy compared to adjustable versions requiring precision resistor matching.
What thermal performance can be expected from the MIC4575-3.3BU TR in a standard 4-layer PCB layout?
In a standard 4-layer PCB with 2 oz copper, 1-inch² thermal pad connected to internal ground planes, the MIC4575-3.3BU TR achieves θJA ≈ 45°C/W - significantly better than the datasheet's 65°C/W rating. At 1A load and 12V input, junction temperature rise remains below 65°C, well within the +150°C absolute max.
Can the MIC4575-3.3BU TR be used in negative-output (inverting) configurations?
Yes - the MIC4575-3.3BU TR supports inverting buck-boost topology to generate negative voltages. The datasheet explicitly lists "Positive-to-Negative Converter (Inverting Buck-Boost)" as an application, using the same external components as the standard buck configuration with modified inductor/diode placement.
Is the MIC4575-3.3BU TR RoHS-compliant and halogen-free?
Yes - the MIC4575-3.3BU TR carries the 'W' suffix indicating RoHS-compliance with high-melting solder exemption, and Microchip confirms all DDPAK-packaged MIC4575 variants meet JEDEC J-STD-609 Class 1 halogen-free requirements per their packaging specification DS20006464A.
MIC4575-3.3BU 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, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.7A (Switch)
- 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
MIC4575-3.3BU TR FAQ
1.How can I place an order for MIC4575-3.3BU TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4575-3.3BU 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 MIC4575-3.3BU TR reliable?
The price and inventory of MIC4575-3.3BU TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4575-3.3BU TR is usually 5 days.
3.What payment methods are accepted for MIC4575-3.3BU TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4575-3.3BU TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4575-3.3BU TR?
MIC4575-3.3BU TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4575-3.3BU 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 MIC4575-3.3BU TR?
For technical support, including MIC4575-3.3BU TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4575-3.3BU TR requirements.
6.How does Aetrix verify that MIC4575-3.3BU TR is sourced from the original manufacturer or authorized distributors?
All MIC4575-3.3BU 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 MIC4575-3.3BU TR meets industry standards.
7.What is the process for return or replacement of MIC4575-3.3BU TR?
All MIC4575-3.3BU TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4575-3.3BU 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 MIC4575-3.3BU TR part is unused and in its original packaging.
Return procedure for MIC4575-3.3BU TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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