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Microchip Technology MIC4575-5.0WT
- Part No.:
- MIC4575-5.0WT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
MIC4575-5.0WT.pdf
- Description:
- IC REG BUCK BST 5V 1.7A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:176
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Product details
Overview
MIC4575-5.0WT from Microchip Technology is a fixed-output 5.0V, 1A step-down (buck) switching regulator with 200 kHz switching frequency, ±3% output voltage accuracy over line and load, 4V–24V input range, and thermal/overcurrent protection. It operates in TO-220 package and targets board-level DC-DC conversion for microprocessor core supplies and industrial power rails.
For engineers reviewing the MIC4575-5.0WT datasheet, MIC4575-5.0WT pinout, MIC4575-5.0WT application, or MIC4575-5.0WT equivalent, key selection criteria include guaranteed 1A switch current, fixed 5.0V output tolerance, shutdown current <200 µA, TO-220 thermal resistance (θJA = 65°C/W), and compatibility with standard inductors sized at 25% of LM2575 equivalents.
Technical Context
The MIC4575-5.0WT integrates a BiCMOS NPN power switch, 1.23V bandgap reference, error amplifier, and 200 kHz oscillator to implement voltage-mode PWM control. Its fixed 5.0V output is achieved via internal resistive feedback divider connected to the FB pin.
It features cycle-by-cycle current limiting (1.7–3.0 A peak), thermal shutdown, and TTL-compatible SHDN input (logic low enables, >2.4 V disables). Internal frequency compensation eliminates external compensation components, and the device supports simple buck, inverting buck-boost, and positive-to-negative converter topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±3% over 8–24 V input and 0.1–0.5 A load - ensures stable logic supply for microcontrollers and FPGAs. |
| Switch Current | Guaranteed 1 A continuous - supports full-load operation without derating at +25°C ambient. |
| Switching Frequency | 200 kHz ±10% - enables smaller output filter inductors (≈50% size reduction vs. 52 kHz LM2575). |
| Input Voltage Range | 4 V to 24 V - accommodates wide-input industrial and battery-derived rails. |
| Shutdown Current | <200 µA typical - minimizes standby power in always-on systems. |
| Efficiency | 77% typical at 1 A, 5 V out, 12 V in - reduces thermal load vs. linear regulators in medium-power applications. |
| Oscillator Accuracy | ±10% - sufficient for non-critical timing; no external sync required. |
| Thermal Resistance | θJA = 65°C/W (TO-220) - defines maximum power dissipation before junction exceeds +150°C. |
Pinout & Package
Package: 5-Lead TO-220 (T), through-hole, with exposed tab electrically connected to GND (Pins 3 and TAB). Mounting requires mechanical fastener and thermal interface to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Unregulated Input Supply | Accepts 4–24 V DC; must be bypassed with ≥22 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 internal regulator, switch, and feedback; connects to heatsink for thermal path. |
| 4 (FB) | Feedback Input | Internally tied to 5.0 V divider; shorted directly to output for fixed regulation - no external resistor needed. |
| 5 (SHDN) | Enable/Shutdown Control | TTL-compatible input; ≤1.0 V enables, ≥2.4 V disables regulator and reduces quiescent current to <200 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output with ±3% tolerance | Eliminates external feedback resistors and improves output accuracy vs. adjustable variants. |
| 200 kHz switching frequency | Reduces required inductor size by up to 2:1 versus legacy 52 kHz regulators like LM2575. |
| Integrated cycle-by-cycle current limit | Protects against short-circuit and overload without external sensing components. |
| Internal frequency compensation | Removes need for external compensation network - simplifies design and validation. |
| Thermal shutdown with 100% burn-in test | Ensures robust operation under sustained overload; validated during manufacturing. |
| Standard inductor compatibility | Works with off-the-shelf 68 µH or 150 µH inductors rated for ≥1.5 A saturation current. |
Applications
| Industrial Power Supply | Microprocessor Core Rail |
|---|---|
Use Scenario: On-board 12 V or 24 V bus converted to regulated 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1 A continuous current with line/load regulation better than ±3%. Use Value: Replaces linear regulators to cut power loss by >60% and eliminate heatsink requirements at 1 A load. | Use Scenario: Generating clean 5 V supply for Intel Pentium-class and compatible microprocessors requiring stable core voltage. IC Role / Device Role / Timing Role: Fixed-output buck controller providing tightly regulated 5.0 V with fast transient response to CPU load steps. Use Value: Meets Intel's ±3% output tolerance requirement while supporting up to 1 A peak current without external LDO post-regulation. |
| Battery Charger Auxiliary Rail | Negative Boost Converter |
Use Scenario: Deriving 5 V auxiliary power from a 3S Li-ion battery pack (9–12.6 V) for charger management ICs and status LEDs. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating across wide input range with low quiescent current in standby. Use Value: Extends battery runtime via 77% efficiency at full load and <200 µA shutdown current when charging is complete. | Use Scenario: Generating –5 V rail from a +5 V or +12 V source using inverting buck-boost topology. IC Role / Device Role / Timing Role: Switch-mode controller repurposed as inverting regulator via modified external component connections. Use Value: Enables dual-rail analog circuitry (e.g., op-amp bias) without requiring separate negative supply ICs or transformers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC4575-5.0WU | Same electrical specs; DDPAK (surface-mount) package instead of TO-220 - θJA = 65°C/W, same θJC = 2°C/W. | Requires PCB rework for SMT assembly; better suited for automated production and space-constrained layouts. | Select WU for volume production where thermal performance matches and board real estate is limited. |
| LM2575HVS-5.0 | 52 kHz switching, ±4% output tolerance, higher dropout, larger inductor requirement, no integrated SHDN pin. | Lacks shutdown control and delivers lower efficiency (≈65%) - suitable only where EMI sensitivity mandates lower frequency. | Choose only if 52 kHz operation is mandated for EMI compliance and 1 A load is intermittent. |
Compared with MIC4575-5.0WU, the MIC4575-5.0WT offers identical regulation and protection but enables simpler heatsinking via TO-220 mounting; versus LM2575HVS-5.0, it delivers 12% higher efficiency and 2× smaller magnetics at the cost of higher EMI susceptibility.
Availability
MIC4575-5.0WT is available at Aetrix Electronics and suitable for industrial power supplies, microprocessor core rails, and battery-powered embedded systems requiring stable component supply and long-term manufacturability.
Supply support for MIC4575-5.0WT 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 Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with global design, manufacturing, and support infrastructure.
The MIC4575 family was designed as drop-in replacements for LM2575-based buck converters, targeting cost-sensitive, medium-power industrial and computing applications needing improved efficiency and reduced component count.
FAQ
What is the maximum input voltage rating for the MIC4575-5.0WT?
The MIC4575-5.0WT has an absolute maximum input voltage rating of +40 V, but its recommended operating input voltage is +4 V to +24 V. Operation above +24 V is not guaranteed and may cause permanent damage during output short-circuit conditions. The MIC4575-5.0WT is specified for stable 5.0 V output only within the 8–24 V input range at full 1 A load.
Does the MIC4575-5.0WT require external feedback resistors?
No, the MIC4575-5.0WT does not require external feedback resistors. It uses an internal precision resistive divider to set the 5.0 V output, and the FB pin is internally connected to this network. Users must connect the FB pin directly to the output voltage node - no external components are needed for regulation.
What thermal management is required for the MIC4575-5.0WT at full 1 A load?
At 1 A output with 12 V input, the MIC4575-5.0WT dissipates ≈1.5 W. With θJA = 65°C/W, junction temperature rise is ≈98°C above ambient. To keep TJ ≤ +125°C, ambient must stay ≤ +27°C without heatsinking. A minimum 1.5" × 1.5" copper pad with thermal vias is recommended; for continuous 1 A operation above +40°C ambient, a TO-220 heatsink is required. The MIC4575-5.0WT's exposed tab is GND-connected and must be thermally coupled to the heatsink.
Can the MIC4575-5.0WT be used in an inverting buck-boost configuration?
Yes, the MIC4575-5.0WT can be configured as a negative-output inverting buck-boost regulator per Figure 4-8 in the datasheet. In this topology, the SW pin drives the inductor to ground, the GND pin becomes the negative output reference, and the output capacitor is connected between GND and –VOUT. The MIC4575-5.0WT maintains regulation and protection functions, delivering up to –5 V at 0.5 A with appropriate component selection.
What is the shutdown behavior of the MIC4575-5.0WT?
When the SHDN pin is pulled to ≥2.4 V, the MIC4575-5.0WT disables the internal switch and error amplifier, reducing total supply current to <200 µA typical. The output voltage collapses, but the FB and SW pins remain high-impedance. Pulling SHDN ≤1.0 V re-enables regulation with soft-start behavior. The MIC4575-5.0WT's SHDN input draws only 4–30 µA, enabling direct drive from MCU GPIO without level-shifting.
MIC4575-5.0WT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- 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):
- 5V
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
MIC4575-5.0WT FAQ
1.How can I place an order for MIC4575-5.0WT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4575-5.0WT 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 MIC4575-5.0WT reliable?
The price and inventory of MIC4575-5.0WT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4575-5.0WT is usually 5 days.
3.What payment methods are accepted for MIC4575-5.0WT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4575-5.0WT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4575-5.0WT?
MIC4575-5.0WT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4575-5.0WT 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 MIC4575-5.0WT?
For technical support, including MIC4575-5.0WT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4575-5.0WT requirements.
6.How does Aetrix verify that MIC4575-5.0WT is sourced from the original manufacturer or authorized distributors?
All MIC4575-5.0WT 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 MIC4575-5.0WT meets industry standards.
7.What is the process for return or replacement of MIC4575-5.0WT?
All MIC4575-5.0WT units undergo pre-shipment inspection (PSI). If there is an issue with MIC4575-5.0WT, 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 MIC4575-5.0WT part is unused and in its original packaging.
Return procedure for MIC4575-5.0WT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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