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Microchip Technology MIC4575-3.3WU-TR
- Part No.:
- MIC4575-3.3WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4575-3.3WU-TR.pdf
- Description:
- IC REG BCK BST 3.3V 1.7A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,484
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Product details
Overview
MIC4575-3.3WU-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 and industrial controllers.
For engineers reviewing the MIC4575-3.3WU-TR datasheet, MIC4575-3.3WU-TR pinout, MIC4575-3.3WU-TR application, or MIC4575-3.3WU-TR equivalent, this page delivers verified electrical specs, package mapping to DDPAK-5L, functional role in buck topology, and real-world design constraints including minimum external component count and 72% typical efficiency at 1A.
Technical Context
The MIC4575-3.3WU-TR integrates a BiCMOS NPN power switch with internal 1.23V bandgap reference and error amplifier, operating at a guaranteed 180–220 kHz oscillator frequency. Its fixed 3.3V output eliminates external feedback resistors, simplifying layout versus adjustable variants.
Duty cycle control uses voltage-mode PWM with cycle-by-cycle current limiting and thermal shutdown. Input voltage range is 4–24V, supporting wide industrial supply rails; shutdown mode draws <200 µA, enabling low-power standby operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±3% (3.168–3.432V) across 6–24V input and 0.2–1A load - ensures stable logic rail for 3.3V microcontrollers. |
| Switching Frequency | 200 kHz ±10% - enables smaller inductors (e.g., 68 µH) vs. legacy 52 kHz regulators like LM2575. |
| Max Output Current | 1A continuous - supports single-rail powering of SoCs, FPGAs, and sensor interfaces. |
| Input Voltage Range | 4V to 24V - accommodates 5V, 12V, and 24V industrial bus systems without pre-regulation. |
| Efficiency | 72% typical at 1A, 3.3V out, 12V in - reduces thermal load vs. linear regulators in high-current applications. |
| Shutdown Current | <200 µA - enables battery-backed systems to maintain ultra-low quiescent power during sleep modes. |
| Thermal Protection | Internal thermal shutdown with 100% burn-in - prevents latch-up or damage under sustained overload or poor heatsinking. |
Pinout & Package
The MIC4575-3.3WU-TR is housed in a 5-lead DDPAK (TO-263) surface-mount package with exposed thermal pad (Tab = GND), optimized for high-power density and thermal dissipation (θJC = 2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Unregulated input supply | Accepts 4–24V DC; requires local 22–150 µF input capacitor for stability and ripple suppression. |
| 2 - SW | Switch node output | Drives external inductor and Schottky diode; high dv/dt node requiring tight layout and ground plane coupling. |
| 3 & Tab - GND | Power and signal reference | Common return for input cap, output cap, and feedback path; thermal pad must be soldered to PCB copper for thermal performance. |
| 4 - FB | Feedback input | Internally tied to 3.3V divider; shorted directly to output for fixed version - no external resistor network needed. |
| 5 - SHDN | Enable/disable control | TTL-compatible logic input; ≤1.0V enables, ≥2.4V disables regulator - supports microcontroller-controlled power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±3% regulation. |
| 200 kHz switching | Enables up to 2× smaller inductors than 52 kHz equivalents (e.g., LM2575), improving board space efficiency. |
| Integrated protection | Cycle-by-cycle current limiting + thermal shutdown prevent failure during short-circuit or overtemperature conditions. |
| Low shutdown current | <200 µA standby draw allows use in always-on systems with battery backup or energy harvesting. |
| DDPAK-5L package | Surface-mount thermal package with θJA = 65°C/W and θJC = 2°C/W - supports 1A operation with minimal heatsinking. |
Applications
| Industrial Power Supply | Microprocessor Core Rail |
|---|---|
Use Scenario: On-board 24V-to-3.3V conversion for PLC I/O modules and motor drive control logic. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated 3.3V to FPGA configuration memory and communication peripherals. Use Value: ±3% output tolerance and 72% efficiency minimize heat generation in enclosed enclosures without forced airflow. | Use Scenario: Step-down supply for Intel Pentium-class and compatible 3.3V microprocessors in legacy computing platforms. IC Role / Device Role / Timing Role: High-current, fixed-output DC-DC converter replacing linear regulators to reduce thermal stress on CPU power delivery. Use Value: 1A capability and 200 kHz operation enable compact filter design meeting transient response requirements for processor load steps. |
| Battery-Powered Instrumentation | Industrial Sensor Node |
Use Scenario: Power management in portable test equipment using 12V Li-ion packs to feed 3.3V MCU and ADC subsystems. IC Role / Device Role / Timing Role: Main system regulator with shutdown control for deep-sleep modes between measurement cycles. Use Value: <200 µA shutdown current extends battery life; wide 4–24V input accommodates varying pack voltage during discharge. | Use Scenario: Remote environmental monitoring node powered by 24V industrial bus, supplying 3.3V to wireless transceiver and analog sensors. IC Role / Device Role / Timing Role: Robust, thermally protected buck converter ensuring reliable operation in unventilated field enclosures. Use Value: Internal thermal shutdown and current limiting prevent field failures due to ambient temperature drift or sensor short circuits. |
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-220-5L package - higher θJA (65°C/W), through-hole mounting, no thermal pad. | Preferred for prototyping, low-volume assembly, or where mechanical robustness outweighs thermal density. | Select when manual soldering, heatsink attachment, or legacy footprint compatibility is required. |
| LM2575-3.3 | 52 kHz switching, larger inductor requirement, ±4% output tolerance, no integrated shutdown pin. | Suitable only where lower EMI or legacy design reuse is prioritized over size/efficiency. | Choose only if redesign is impractical and 52 kHz operation meets EMI and transient requirements. |
Compared with MIC4575-3.3WT, the MIC4575-3.3WU-TR offers superior thermal performance via DDPAK's low θJC, while LM2575-3.3 trades efficiency and integration for legacy compatibility - making MIC4575-3.3WU-TR optimal for new high-density, thermally constrained designs.
Availability
MIC4575-3.3WU-TR is available at Aetrix Electronics and suitable for industrial power supplies, microprocessor core rails, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4575-3.3WU-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 devices, and power management ICs, with global manufacturing and quality certifications.
The MIC4575 series was designed as a drop-in upgrade to LM2575 for industrial and embedded applications demanding higher efficiency, smaller magnetics, and integrated protection - targeting cost-sensitive, high-reliability DC-DC conversion.
FAQ
What is the maximum input voltage rating for the MIC4575-3.3WU-TR?
The MIC4575-3.3WU-TR has an absolute maximum input voltage rating of +40V, but its recommended operating input voltage range is +4V to +24V. Operation above +24V is not guaranteed and may compromise reliability - especially under short-circuit conditions. The datasheet explicitly notes that the device is not guaranteed to survive a short-circuit to ground for input voltages above 24V.
Does the MIC4575-3.3WU-TR require external feedback resistors?
No, the MIC4575-3.3WU-TR does not require external feedback resistors. As a fixed 3.3V output variant, it integrates an internal resistive divider connected to the FB pin. The FB pin must be connected directly to the output voltage node - unlike adjustable versions, which require an external R1/R2 divider to set VOUT = 1.23V × (1 + R1/R2).
What package type is used for the MIC4575-3.3WU-TR, and how is thermal management handled?
The MIC4575-3.3WU-TR uses a 5-lead DDPAK (TO-263) package with an exposed thermal pad electrically connected to GND (Pin 3). Thermal management relies on soldering the tab to a large PCB copper area - achieving θJC = 2°C/W and θJA = 65°C/W. This enables 1A operation without additional heatsinks under typical ambient conditions.
How does the shutdown (SHDN) pin function on the MIC4575-3.3WU-TR?
The SHDN pin on the MIC4575-3.3WU-TR is TTL-compatible: a logic low (≤1.0V) enables regulation, while a logic high (≥2.4V) disables the internal switch and reduces quiescent current to <200 µA. When unused, SHDN should be grounded. The pin draws only 4–30 µA depending on state, making it suitable for direct interfacing with microcontroller GPIOs.
Can the MIC4575-3.3WU-TR be used in negative-output (inverting) configurations?
Yes, the MIC4575-3.3WU-TR can be configured as a positive-to-negative inverting buck-boost converter per Microchip's application note AN15. In this topology, the SW pin drives an inductor to a negative output capacitor, with GND becoming the negative rail. However, the fixed 3.3V feedback architecture means the magnitude remains 3.3V - yielding –3.3V output. Layout must respect high dv/dt paths and grounding separation.
MIC4575-3.3WU-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, 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
MIC4575-3.3WU-TR FAQ
1.How can I place an order for MIC4575-3.3WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4575-3.3WU-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 MIC4575-3.3WU-TR reliable?
The price and inventory of MIC4575-3.3WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4575-3.3WU-TR is usually 5 days.
3.What payment methods are accepted for MIC4575-3.3WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4575-3.3WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4575-3.3WU-TR?
MIC4575-3.3WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4575-3.3WU-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 MIC4575-3.3WU-TR?
For technical support, including MIC4575-3.3WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4575-3.3WU-TR requirements.
6.How does Aetrix verify that MIC4575-3.3WU-TR is sourced from the original manufacturer or authorized distributors?
All MIC4575-3.3WU-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 MIC4575-3.3WU-TR meets industry standards.
7.What is the process for return or replacement of MIC4575-3.3WU-TR?
All MIC4575-3.3WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC4575-3.3WU-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 MIC4575-3.3WU-TR part is unused and in its original packaging.
Return procedure for MIC4575-3.3WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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