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Microchip Technology MIC4575WU
- Part No.:
- MIC4575WU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4575WU.pdf
- Description:
- IC REG BUCK BST ADJ 1.7A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,141
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Product details
Overview
MIC4575WU from Microchip Technology is a 1A, 200 kHz fixed-frequency step-down (buck) DC-DC regulator in DDPAK-5 package, supporting adjustable output voltage from 1.23V to 20V with ±2% feedback voltage tolerance, 4V–24V input range, and thermal/overcurrent protection. It replaces LM2575 with higher switching frequency for smaller magnetics and is used in industrial power supplies and embedded system pre-regulation.
For engineers reviewing the MIC4575WU datasheet, MIC4575WU pinout, MIC4575WU application, or MIC4575WU equivalent, key selection criteria include its 1A guaranteed switch current, internal compensation, shutdown quiescent current <200 µA, and compatibility with standard inductors-critical for compact, high-efficiency buck converter designs requiring minimal external components.
Technical Context
The MIC4575WU implements a BiCMOS synchronous-buck architecture with an internal 1A NPN power switch, 200 kHz oscillator (±10% tolerance), and 1.23V bandgap reference. Its error amplifier compares FB voltage against this reference to control duty cycle via PWM comparator.
It features cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible SHDN input (logic low enables). The device operates across –40°C to +85°C junction temperature and supports both fixed-output and adjustable configurations via external resistor divider on FB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current | Guaranteed 1A peak - supports continuous 1A load without derating at rated ambient. |
| Oscillator Frequency | 200 kHz ±10% - enables ~2× smaller inductor vs. 52 kHz LM2575, reducing board area. |
| Input Voltage Range | 4V to 24V - suitable for 5V, 12V, and 24V rail conversion in industrial and embedded systems. |
| Output Voltage Range | 1.23V to 20V (adjustable) - set by external resistive divider; no internal feedback network required. |
| Feedback Voltage Tolerance | ±2% (1.23V nominal) - ensures precise output regulation under line/load variations. |
| Shutdown Current | <200 µA typical - minimizes standby power in battery-backed or energy-sensitive applications. |
| Thermal Protection | Internal thermal shutdown - prevents damage during overload or poor heatsinking conditions. |
Pinout & Package
The MIC4575WU is housed in a 5-lead DDPAK (TO-263) thermally enhanced surface-mount package with exposed tab (GND-connected) for improved heat dissipation. Pin 1 is VIN; pin 2 is SW; pins 3 and tab are GND; pin 4 is FB; pin 5 is SHDN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Unregulated input supply | Accepts 4V–24V DC; must be decoupled near pin with ≥22 µF ceramic or low-ESR electrolytic. |
| 2 (SW) | Switch node output | Drives external inductor and Schottky diode; high dv/dt node requiring careful layout and ground return path. |
| 3 & Tab (GND) | Power and signal ground | Exposed thermal pad is electrically GND; must be soldered to large PCB copper area for thermal performance. |
| 4 (FB) | Feedback input | Connects to 1.23V tap of external resistor divider; high-impedance input (50–100 nA bias current). |
| 5 (SHDN) | Enable/disable control | TTL-compatible input; logic low (≤0.8V) enables regulator; logic high (≥2.4V) disables with <200 µA quiescent draw. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 200 kHz operation | Enables predictable EMI filtering and consistent inductor sizing across designs. |
| Internal frequency compensation | Eliminates need for external compensation network-reduces BOM count and design iteration. |
| Standard inductor compatibility | Uses off-the-shelf 68 µH or 150 µH inductors-no custom magnetics required. |
| Thermal shutdown + overcurrent protection | Provides fault resilience without external monitoring circuitry in harsh environments. |
| Wide 4V–24V input range | Supports direct connection to unregulated 12V/24V rails common in industrial and automotive auxiliary systems. |
Applications
| Industrial Power Supply | Embedded System Pre-Regulator |
|---|---|
Use Scenario: Converting 24V factory bus to 5V/1A for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, efficient intermediate voltage rail. Use Value: Delivers 77% efficiency at 1A load with minimal external parts-reducing thermal stress and footprint in space-constrained enclosures. | Use Scenario: Generating 3.3V from 12V for microcontroller, FPGA, or communication ICs in edge devices. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-noise LDOs or directly powering digital logic. Use Value: 200 kHz switching allows use of small 68 µH inductors and avoids audible noise-ideal for fanless embedded deployments. |
| Negative Output Converter | Battery Charger Control |
Use Scenario: Generating –5V from +12V input for op-amp biasing or analog front-end circuits. IC Role / Device Role / Timing Role: Inverting buck-boost topology using MIC4575WU in flyback configuration. Use Value: Leverages same external component values as positive buck design-simplifies dual-rail development and inventory management. | Use Scenario: Constant-current/constant-voltage stage in Li-ion or lead-acid battery charger for portable tools. IC Role / Device Role / Timing Role: Adjustable-output buck controller regulating charge voltage and current via FB divider and current-sense feedback. Use Value: ±2% VFB tolerance ensures accurate termination voltage (e.g., 4.2V ±0.084V), improving cell longevity and safety compliance. |
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 | Fixed 5.0V output; ±3% output tolerance; no external FB divider required. | Used where 5V rail is fixed and no adjustment needed-simpler layout but less flexible. | Select when system requires only 5V output and minimal external components; not interchangeable with MIC4575WU due to different feedback architecture. |
| LM2575HVS-ADJ | 52 kHz switching; TO-220/TO-263 packages; 1A switch; wider 4V–60V input range. | Preferred for high-input-voltage applications (>24V) or where lower EMI is prioritized over size. | Choose for legacy compatibility or >24V inputs; requires larger inductor and may need external compensation-increases design complexity vs. MIC4575WU. |
Compared with MIC4575-5.0WU, the MIC4575WU offers output flexibility and tighter feedback tolerance but requires two resistors; versus LM2575HVS-ADJ, it delivers higher efficiency and smaller magnetics at the cost of reduced max input voltage and no 60V rating.
Availability
MIC4575WU is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, negative output converters, and battery charger control requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC4575WU 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, interface, and power management ICs, with a focus on reliability and long-term product availability.
The MIC4575 series belongs to Microchip's legacy analog power portfolio, designed specifically for simple, robust, and cost-effective DC-DC buck conversion in industrial, embedded, and battery-powered equipment.
FAQ
What is the maximum input voltage rating for the MIC4575WU?
The MIC4575WU 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 to survive a short-circuit to ground, and sustained operation beyond 24V may impact reliability. Always refer to the Absolute Maximum Ratings table in the official DS20006464A datasheet for safe design margins.
Does the MIC4575WU require external compensation components?
No, the MIC4575WU includes internal frequency compensation, eliminating the need for external capacitors or resistors in the feedback loop. This simplifies design, reduces BOM count, and improves consistency across production units-key advantages over older buck controllers like the LM2575 that require manual compensation network design.
Can the MIC4575WU be used in a negative-output (inverting) buck-boost configuration?
Yes, the MIC4575WU supports inverting buck-boost topologies to generate negative output voltages-for example, –5V from +12V input. The functional block diagram and Figure 4-8 in DS20006464A confirm this capability using standard external components (inductor, diodes, capacitors). Layout must respect high dv/dt SW node and proper grounding for stability.
What is the thermal resistance (θJA) of the MIC4575WU in its DDPAK package?
The MIC4575WU in the 5-lead DDPAK (U) package has a junction-to-ambient thermal resistance (θJA) of 65°C/W under standard JEDEC test conditions. Effective thermal performance depends heavily on PCB copper area connected to the exposed GND tab; doubling the thermal pad area can reduce θJA by ~15–20°C/W in typical layouts.
How does the MIC4575WU's 200 kHz switching frequency compare to the LM2575's 52 kHz?
The MIC4575WU's 200 kHz switching frequency-versus LM2575's 52 kHz-enables up to a 2:1 reduction in output filter inductor size while maintaining comparable efficiency. This translates directly to smaller solution footprint, lower weight, and reduced magnetic core losses, making MIC4575WU ideal for space-constrained industrial and portable applications.
MIC4575WU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263-5
MIC4575WU FAQ
1.How can I place an order for MIC4575WU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4575WU 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 MIC4575WU reliable?
The price and inventory of MIC4575WU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC4575WU is usually 5 days.
3.What payment methods are accepted for MIC4575WU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4575WU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4575WU?
MIC4575WU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4575WU 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 MIC4575WU?
For technical support, including MIC4575WU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4575WU requirements.
6.How does Aetrix verify that MIC4575WU is sourced from the original manufacturer or authorized distributors?
All MIC4575WU 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 MIC4575WU meets industry standards.
7.What is the process for return or replacement of MIC4575WU?
All MIC4575WU units undergo pre-shipment inspection (PSI). If there is an issue with MIC4575WU, 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 MIC4575WU part is unused and in its original packaging.
Return procedure for MIC4575WU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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