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Microchip Technology MIC4575WT
- Part No.:
- MIC4575WT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
MIC4575WT.pdf
- Description:
- IC REG BUCK BST ADJ 1.7A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
MIC4575WT from Microchip Technology is an adjustable-output, 1A, 200 kHz step-down (buck) switching regulator in a 5-lead TO-220 package. It operates from 4V to 24V input, delivers 1.23V–20V output with ±2% feedback voltage tolerance, and integrates thermal shutdown and cycle-by-cycle current limiting. It serves as a high-efficiency pre-regulator for linear regulators or on-card power conversion in industrial embedded systems.
For engineers reviewing the MIC4575WT datasheet, MIC4575WT pinout, MIC4575WT application, or MIC4575WT equivalent, key selection considerations include its fixed 200 kHz switching frequency, guaranteed 1A switch current, ±2% FB voltage accuracy, TO-220 thermal performance (θJA = 65°C/W), and compatibility with standard inductors-enabling compact, thermally robust buck designs without external compensation.
Technical Context
The MIC4575WT uses a BiCMOS process with an internal 1A NPN power switch and a 1.23V bandgap reference. Its 200 kHz oscillator drives a variable-duty-cycle PWM comparator that compares the FB signal against the reference, enabling precise output regulation across line and load variations.
It features integrated cycle-by-cycle current limiting (ILIM = 1.7–3.0 A peak), thermal shutdown activation at TJ ≥ +150°C, and TTL-compatible SHDN control with <200 µA standby current. Frequency compensation is fully internal, requiring no external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 200 kHz ±10% - enables smaller output filter inductors vs. 52 kHz LM2575 (up to 2:1 size reduction) |
| Output Current | 1A continuous - guaranteed switch current supports full-load operation without derating at TA ≤ +85°C |
| Input Voltage Range | 4V to 24V - wide range accommodates 5V, 12V, and 24V industrial rails with margin |
| Output Voltage Range | 1.23V to 20V - set externally via resistive divider; FB tolerance ±2% ensures tight regulation |
| Feedback Voltage | 1.230 V ±2% - stable reference for accurate adjustable output setting across temperature |
| Shutdown Current | <200 µA - ultra-low quiescent draw enables battery-backed or always-on systems |
| Thermal Resistance | θJA = 65°C/W - TO-220 package allows 1A operation with minimal heatsinking in free-air |
Pinout & Package
Package: 5-Lead TO-220 (T), industrial temperature range (–40°C to +85°C), RoHS-compliant with high-melting solder exemption.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN | Unregulated input supply | Accepts 4V–24V DC; must be bypassed with ≥150 µF capacitor near pin for stability |
| 2: SW | Switch node output | Drives external inductor and Schottky diode; high dv/dt node requiring short PCB trace |
| 3 & TAB: GND | Power and thermal ground | Tab is electrically connected to GND; must be soldered to large copper pour for thermal dissipation |
| 4: FB | Feedback input | Connects to 1.23V tap of external resistor divider; bias current ≤100 nA minimizes divider error |
| 5: SHDN | Enable/disable control | TTL-compatible; logic low (≤0.8 V) enables regulator; logic high (≥2.4 V) disables with <200 µA draw |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 200 kHz operation | Eliminates need for external frequency programming; simplifies EMI filtering and layout |
| Internal frequency compensation | Reduces BOM count-no external compensation capacitor required for stable operation |
| Guaranteed 1A switch current | Supports full 1A load across –40°C to +85°C without external current-sense components |
| Thermal shutdown & overcurrent protection | Self-protecting under fault conditions; no external circuitry needed for reliability-critical applications |
| Standard inductor compatibility | Works with off-the-shelf 68 µH or 150 µH inductors-no custom magnetics required |
Applications
| Industrial Power Supply | Microprocessor Core Supply |
|---|---|
Use Scenario: On-board 12V-to-3.3V conversion for PLC I/O modules operating in ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3V/1A to FPGA configuration circuitry and interface logic. Use Value: 77% efficiency at 1A reduces thermal load versus linear regulators; TO-220 package provides direct heatsink mounting. |
Use Scenario: Pre-regulation stage feeding a low-dropout linear regulator for Intel Pentium-class microprocessors. IC Role / Device Role / Timing Role: High-efficiency buck converter stepping 6V–24V input down to 3.3V or 5V before final LDO filtering. Use Value: Fixed 200 kHz frequency enables predictable EMI profile; ±2% FB tolerance ensures stable core voltage under dynamic load transients. |
| Battery Charger Control | Negative Output Converter |
Use Scenario: Constant-current/constant-voltage charging circuit for 3-cell Li-ion packs in portable test equipment. IC Role / Device Role / Timing Role: Adjustable-output buck regulator controlling charge voltage (e.g., 12.6V) and current via feedback loop modulation. Use Value: Wide 1.23V–20V output range supports multiple battery chemistries; shutdown pin enables sleep-mode current reduction. |
Use Scenario: Generating –5V rail from +12V input in analog sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Inverting buck-boost topology using MIC4575WT's switch node to drive coupled inductor and dual Schottky diodes. Use Value: 200 kHz operation allows smaller magnetics than 52 kHz alternatives; integrated current limit protects during polarity reversal faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575HVS-ADJ | 52 kHz switching frequency; requires larger inductor/capacitor; ±2% FB tolerance same; 1A rated but higher dropout | Lower frequency increases EMI filtering complexity; less suitable for space-constrained layouts | Choose when legacy LM2575 footprint compatibility is mandatory and size/efficiency are secondary |
| MP1584EN-LF-Z | 1.5 MHz switching; 3A rated; requires external compensation; 20V max input; different pinout | Higher frequency enables ultra-compact designs but demands careful layout for noise control | Prefer for high-density PCBs where 1.5 MHz allows sub-10 mm² solution size and faster transient response |
Compared with LM2575HVS-ADJ, MIC4575WT offers 3.8× higher frequency for smaller passives and better transient response; versus MP1584EN-LF-Z, it trades higher integration and simpler layout for lower switching speed and relaxed EMI constraints-ideal for cost-sensitive industrial power rails.
Availability
MIC4575WT is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and battery-powered instrumentation requiring stable component supply, long-term manufacturability, and RoHS-compliant through-hole power solutions.
Supply support for MIC4575WT 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 a focus on industrial, automotive, and aerospace reliability standards.
MIC4575WT belongs to Microchip's legacy BiCMOS buck regulator family designed for drop-in replacement of LM2575 while improving efficiency, thermal performance, and design simplicity in fixed-frequency, medium-power DC-DC applications.
FAQ
What is the maximum input voltage rating for the MIC4575WT?
The MIC4575WT 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 events, per Microchip's Absolute Maximum Ratings note.
Does the MIC4575WT require an external compensation network?
No, the MIC4575WT includes fully internal frequency compensation. No external capacitor or resistor network is needed for stable operation across its full load and input voltage range-reducing BOM count and layout complexity compared to many adjustable buck controllers.
What is the thermal resistance of the MIC4575WT in its TO-220 package?
The MIC4575WT in the 5-lead TO-220 package has a junction-to-ambient thermal resistance (θJA) of 65°C/W and a junction-to-case resistance (θJC) of 2°C/W. This allows reliable 1A operation at +85°C ambient with minimal heatsinking when the tab is properly soldered to a thermal pad.
Can the MIC4575WT be used in an inverting buck-boost configuration?
Yes, the MIC4575WT is explicitly supported for positive-to-negative converter applications per its official datasheet. Its SW pin drives the inductor in standard inverting topologies, and the GND pin serves as the negative output reference-enabling robust –5V or –12V generation from a single positive input rail.
What is the shutdown pin logic level threshold for the MIC4575WT?
The MIC4575WT SHDN pin activates shutdown when pulled to ≥2.4V (logic high) and enables regulation when ≤0.8V (logic low). Its TTL-compatible input draws only 4–30 µA in shutdown mode and <10 µA when active, making it suitable for microcontroller GPIO control without level shifting.
MIC4575WT 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 20V
- 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
MIC4575WT FAQ
1.How can I place an order for MIC4575WT through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4575WT 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 MIC4575WT reliable?
The price and inventory of MIC4575WT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4575WT is usually 5 days.
3.What payment methods are accepted for MIC4575WT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4575WT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4575WT?
MIC4575WT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4575WT 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 MIC4575WT?
For technical support, including MIC4575WT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4575WT requirements.
6.How does Aetrix verify that MIC4575WT is sourced from the original manufacturer or authorized distributors?
All MIC4575WT 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 MIC4575WT meets industry standards.
7.What is the process for return or replacement of MIC4575WT?
All MIC4575WT units undergo pre-shipment inspection (PSI). If there is an issue with MIC4575WT, 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 MIC4575WT part is unused and in its original packaging.
Return procedure for MIC4575WT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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