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Microchip Technology MIC4575-3.3WU
- Part No.:
- MIC4575-3.3WU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC4575-3.3WU.pdf
- Description:
- IC REG BCK BST 3.3V 1.7A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,529
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Product details
Overview
MIC4575-3.3WU from Microchip Technology is a fixed-output 3.3V, 1A synchronous step-down (buck) 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-designed for compact DC/DC conversion in embedded power rails.
For engineers reviewing the MIC4575-3.3WU datasheet, MIC4575-3.3WU pinout, MIC4575-3.3WU application, or MIC4575-3.3WU equivalent, this page delivers verified specifications, package mapping to DDPAK-5, functional pin roles, real-world use cases including Intel Pentium-compatible 6V-to-3.3V regulation, and validated alternative parts for supply continuity planning.
Technical Context
The MIC4575-3.3WU integrates a BiCMOS NPN power switch, 1.23V bandgap reference, error amplifier, and 200 kHz oscillator to implement voltage-mode PWM control. Its fixed 3.3V output is achieved via internal feedback divider, eliminating external resistors while maintaining ±3% tolerance across line and load.
It operates from 4V to 24V input, delivers up to 1A continuous output current, and features TTL-compatible shutdown (SHDN) with <200 µA standby current. Protection includes thermal shutdown and peak-current limiting at 1.7–3.0 A, with internal frequency compensation enabling minimal external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±3% (guaranteed over 6–24V input, 0.2–1A load) |
| Switching Frequency | 200 kHz ±10% (enables ~2× smaller inductors vs. LM2575) |
| Max Output Current | 1 A continuous (with thermal derating above +85°C ambient) |
| Input Voltage Range | 4 V to 24 V (absolute max +40 V; short-circuit survival limited to ≤24 V) |
| Efficiency | 72% typical at 1A, 3.3V output (VIN = 12V) |
| Shutdown Current | <200 µA (SHDN ≥2.4V disables regulator) |
| Thermal Resistance | θJA = 65°C/W (DDPAK package, standard PCB layout) |
Pinout & Package
Microchip MIC4575-3.3WU is housed in a 5-lead DDPAK (TO-263) surface-mount package with exposed thermal pad (Tab = GND). The package supports high-power dissipation with θJC = 2°C/W and requires minimum copper area per Microchip's land pattern recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Unregulated Input Supply | Accepts 4–24V DC; must be decoupled with ≥22 µF low-ESR capacitor near pin |
| 2 (SW) | Switch Node | Drives external inductor and Schottky diode; high dv/dt node requiring tight layout |
| 3 & Tab (GND) | Power and Signal Ground | Common return for input cap, output cap, feedback, and thermal pad; critical for EMI and stability |
| 4 (FB) | Feedback Input | Internally tied to 3.3V divider; connect directly to output for regulation; no external resistors needed |
| 5 (SHDN) | Enable/Shutdown Control | TTL-compatible logic input; low = enabled, high (≥2.4V) = shutdown with <200 µA quiescent draw |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity |
| 200 kHz switching | Enables use of standard 68 µH inductors-~50% smaller than those required for 52 kHz LM2575 |
| Integrated protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload or short-circuit |
| Low shutdown current | <200 µA enables battery-backed or always-on systems to maintain ultra-low standby power |
| Wide input range | 4–24V operation supports 12V industrial rails, 6V battery inputs, and unregulated wall adapters |
Applications
| Intel Pentium Core Rail | Battery-Powered Embedded System |
|---|---|
Use Scenario: Generating stable 3.3V core voltage from 6V battery or 12V intermediate rail for legacy Intel Pentium-class microprocessors. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3V/1A with ±3% accuracy and fast transient response. Use Value: Replaces LM2575 with identical pinout but higher efficiency and smaller magnetics-reducing board area by ~30% in space-constrained CPU modules. |
Use Scenario: Powering ARM Cortex-M4-based sensor nodes with intermittent 3.3V loads (MCU, radio, ADC) from single-cell Li-ion or dual-cell alkaline. IC Role / Device Role / Timing Role: Main buck converter enabling >72% efficiency at 1A, with shutdown mode extending battery life during sleep cycles. Use Value: Delivers 1A peak current while drawing only 50–200 µA in shutdown-supporting multi-year battery life in IoT edge devices. |
| Industrial PLC I/O Module | Negative Boost Converter |
Use Scenario: Providing isolated 3.3V logic supply for digital I/O circuits in programmable logic controllers operating from 24V DC field bus. IC Role / Device Role / Timing Role: On-card switching regulator replacing linear regulators to avoid thermal throttling under full-load conditions. Use Value: Handles 24V input without derating; thermal shutdown prevents failure during sustained 1A load in enclosed enclosures. |
Use Scenario: Generating –5V from +12V supply using inverting buck-boost topology for analog front-end biasing. IC Role / Device Role / Timing Role: Switch-mode controller configured in inverting mode with external diode and inductor. Use Value: Leverages same 200 kHz oscillator and current-limit architecture as buck mode-enabling dual-rail designs with one IC family. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-3.3T | 52 kHz switching, TO-220-5 package, ±4% output tolerance, higher EMI, larger inductor requirement | Legacy design reuse where footprint compatibility and lower cost outweigh efficiency gains | Select when retrofitting existing LM2575 layouts; not pin-compatible due to different frequency and thermal pad layout |
| MIC24045-3.3WU | 3 MHz switching, integrated MOSFETs, 2A output, requires external compensation, tighter layout constraints | High-density, high-efficiency designs needing faster transient response and smaller passive components | Choose for new designs targeting >90% efficiency and sub-10 mm² solution size; requires redesign of filter network |
Compared with LM2575-3.3T and MIC24045-3.3WU, the MIC4575-3.3WU delivers optimal balance of drop-in upgrade path (same pinout as LM2575), proven reliability in industrial temperature range, and 200 kHz operation that reduces inductor size without demanding ultra-high-frequency layout discipline.
Availability
MIC4575-3.3WU is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered edge sensors, Intel Pentium-compatible computing modules, and negative boost converters requiring stable component supply with long lifecycle visibility.
Supply support for MIC4575-3.3WU 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 industrial, automotive, and aerospace reliability standards.
The MIC4575 series was designed as a high-frequency, drop-in replacement for LM2575 in cost-sensitive, space-constrained DC/DC applications-emphasizing ease of use, minimal external components, and robust protection for unattended operation.
FAQ
What is the maximum input voltage rating for MIC4575-3.3WU?
The MIC4575-3.3WU has an absolute maximum input voltage of +40V, but Microchip specifies safe operational limits up to +24V. Input voltages above 24V are not guaranteed to survive output short-circuits, and sustained operation beyond 24V may impact reliability. For robust 24V industrial applications, the MIC4575-3.3WU is fully characterized and qualified.
Does MIC4575-3.3WU require external feedback resistors?
No, the MIC4575-3.3WU does not require external feedback resistors. It uses an internal precision voltage divider to set the 3.3V output, and the FB pin is internally connected to this network. Users simply connect FB directly to the output node-eliminating resistor matching errors and saving board space.
What package type is used for MIC4575-3.3WU?
The MIC4575-3.3WU is packaged in a 5-lead DDPAK (also known as TO-263), with Pin 3 and the exposed thermal tab both connected to GND. This surface-mount package provides superior thermal performance (θJC = 2°C/W) compared to TO-220 and is optimized for automated assembly in high-volume production.
How does MIC4575-3.3WU handle overcurrent conditions?
The MIC4575-3.3WU implements cycle-by-cycle peak current limiting with a threshold of 1.7–3.0 A. During overload, it reduces duty cycle to hold peak switch current within limit. If sustained, thermal shutdown activates at junction temperatures exceeding +150°C, latching off until cool-down-protecting both the IC and external components.
Can MIC4575-3.3WU be used in inverting buck-boost configurations?
Yes, the MIC4575-3.3WU can be configured as a negative boost (inverting) converter, as confirmed in Figure 4-8 of the datasheet. In this topology, the SW pin drives the inductor to generate a negative output referenced to VIN, supporting ±5V split supplies. Component selection (inductor, diode, capacitors) must follow Microchip's AN14 design guide for stability.
MIC4575-3.3WU 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:
- 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 FAQ
1.How can I place an order for MIC4575-3.3WU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC4575-3.3WU 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 reliable?
The price and inventory of MIC4575-3.3WU 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 is usually 5 days.
3.What payment methods are accepted for MIC4575-3.3WU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC4575-3.3WU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC4575-3.3WU?
MIC4575-3.3WU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC4575-3.3WU 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?
For technical support, including MIC4575-3.3WU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC4575-3.3WU requirements.
6.How does Aetrix verify that MIC4575-3.3WU is sourced from the original manufacturer or authorized distributors?
All MIC4575-3.3WU 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 meets industry standards.
7.What is the process for return or replacement of MIC4575-3.3WU?
All MIC4575-3.3WU units undergo pre-shipment inspection (PSI). If there is an issue with MIC4575-3.3WU, 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 part is unused and in its original packaging.
Return procedure for MIC4575-3.3WU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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