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Microchip Technology LM2575WU
- Part No.:
- LM2575WU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575WU.pdf
- Description:
- IC REG BUCK ADJ 1A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:125
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Product details
Overview
LM2575WU from Micrel is an adjustable-output 1A step-down (buck) switching regulator in TO-263 package, operating at 52kHz fixed frequency with 4V–40V input range and 1.23V–37V output range. It delivers ±2% feedback voltage accuracy, includes cycle-by-cycle current limiting and thermal shutdown, and replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the LM2575WU datasheet, LM2575WU pinout, LM2575WU application, or LM2575WU equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The LM2575WU integrates a 52kHz oscillator, error amplifier with 1.23V bandgap reference, PWM comparator, and 1A NPN switch with built-in current limit and thermal shutdown. Its internal compensation eliminates external compensation networks, enabling stable operation with only four external components.
It operates in continuous conduction mode across its full load range (0–1A) and input range (4–40V), delivering up to 80% typical efficiency at 1A output. Standby quiescent current is ≤200µA when ON/OFF pin is high, supporting low-power system states without external enable circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1A continuous output-supports single-rail microcontroller or FPGA core supply without derating. |
| Input Voltage Range | 4V to 40V-accepts wide-range unregulated inputs including automotive battery (9–16V), industrial 24V rails, and legacy 36V systems. |
| Output Voltage Range | 1.23V to 37V-set via external resistor divider; enables precise core voltage tuning or custom analog supply generation. |
| Oscillator Frequency | 52kHz ±10%-low-frequency switching reduces EMI and allows use of low-cost, high-saturation-current inductors. |
| Feedback Accuracy | ±2% over temperature and load-ensures tight regulation for sensitive analog circuits without post-regulation LDOs. |
| Standby Current | <200µA-enables true shutdown mode for battery-powered systems with minimal leakage drain. |
| Thermal Protection | Internal thermal shutdown with automatic recovery-prevents latch-up during overload or poor heatsinking without external reset logic. |
Pinout & Package
LM2575WU uses a 5-pin TO-263 (D²PAK) surface-mount package with exposed tab for thermal dissipation. The tab is electrically connected to Pin 3 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 4–40V unregulated DC; requires ≥100µF input capacitor placed within 5mm for stability. |
| 2 (OUT) | Switch Node | Drives external catch diode and inductor; high dI/dt node-requires shortest possible PCB trace to minimize ringing. |
| 3 (GND) | Power Ground | Main return path for switch current and IC bias; must connect directly to large copper pour under exposed tab. |
| 4 (FB) | Feedback Input | Senses output voltage via resistor divider; high-impedance (50nA bias) node-keep away from noise sources. |
| 5 (ON/OFF) | Enable Control | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables output and reduces IQ to <200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-frequency 52kHz oscillator | Enables predictable EMI filtering and consistent inductor sizing across designs without frequency drift. |
| Internal frequency compensation | Eliminates need for external compensation network-reduces BOM count and layout sensitivity. |
| Cycle-by-cycle current limiting | Prevents MOSFET or diode failure during short-circuit events without requiring external current-sense resistors. |
| Thermal shutdown with auto-recovery | Protects against sustained overload without manual reset-maintains system availability during transient thermal stress. |
| Low standby current (<200µA) | Supports energy-sensitive applications like remote sensors where sleep-mode power budget is sub-100µA. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Regulating 12V vehicle battery to 3.3V for microcontroller and CAN transceiver in under-hood ECUs. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and thermally robust 3.3V rail. Use Value: Eliminates need for heat sink due to TO-263 thermal performance and 80%+ efficiency at 1A, reducing module size and cost. | Use Scenario: Generating 5V from 24V factory automation bus to power programmable logic controllers and fieldbus interfaces. IC Role / Device Role / Timing Role: Main DC-DC converter delivering regulated 5V at up to 1A with line/load regulation better than ±3%. Use Value: Wide 4–40V input range accommodates brownout and surge conditions common in industrial environments. |
| Medical Point-of-Care Monitor | Test & Measurement Equipment |
Use Scenario: Converting 12V battery or adapter input to adjustable 1.8V/2.5V for ADC reference and sensor signal conditioning. IC Role / Device Role / Timing Role: Adjustable buck regulator supplying precision analog rails with ±2% feedback accuracy. Use Value: External resistor divider enables exact voltage setting without trimming, improving production yield and calibration stability. | Use Scenario: Providing clean 12V rail from 36V lab supply for op-amp and data acquisition subsystems. IC Role / Device Role / Timing Role: High-efficiency pre-regulator preceding low-noise LDOs to reduce thermal load on final stage. Use Value: 88% efficiency at 12V output minimizes heat generation in enclosed benchtop enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-5.0 | Fixed 5V output; TO-220 package; same 52kHz frequency and 1A rating. | No external feedback resistors required; simpler for fixed-voltage use cases. | Select when 5V output is sufficient and through-hole assembly is preferred. |
| MP1584EN-LF-Z | 1.5A rating; 1.5MHz switching frequency; SOIC-8 package; requires external compensation. | Higher frequency enables smaller magnetics but increases EMI filtering complexity. | Select when higher current or smaller solution size is prioritized over thermal robustness and simplicity. |
Compared with LM2575WU, LM2575T-5.0 offers plug-and-play 5V regulation in TO-220 but lacks adjustability, while MP1584EN-LF-Z delivers higher current and frequency in a smaller package but demands careful loop compensation and EMI mitigation-making LM2575WU optimal for rugged, low-complexity 1A adjustable designs.
Availability
LM2575WU is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical monitors, test equipment, and embedded power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LM2575WU 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
Micrel Inc. was a U.S.-based semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.
The LM2575WU belongs to Micrel's legacy buck regulator product line, designed for simple, robust, and cost-effective DC-DC conversion in industrial, automotive, and medical applications where reliability and ease of use outweigh ultra-high density or ultra-high efficiency requirements.
FAQ
What is the maximum input voltage rating for LM2575WU?
The LM2575WU has an absolute maximum input voltage rating of 45V, with recommended operating input voltage up to 40V. Exceeding 40V may trigger internal protection or degrade long-term reliability. The device maintains regulation across its full 4V–40V input range, making it suitable for 24V industrial systems with transient surges.
Does LM2575WU require external compensation components?
No, LM2575WU does not require external compensation components. It integrates internal frequency compensation optimized for standard buck configurations using a 330µH inductor and Schottky catch diode. This simplifies design and improves stability across temperature and load variations without needing loop analysis or capacitor selection.
What is the thermal resistance (θJA) of LM2575WU in its TO-263 package?
The LM2575WU in TO-263 package has a junction-to-ambient thermal resistance (θJA) of approximately 100°C/W with ~1 square inch of PCB copper surrounding the leads. With enhanced copper area and proper thermal vias to inner ground planes, θJA can be reduced significantly-enabling 1A continuous operation without a heatsink at ambient temperatures up to 70°C.
Can LM2575WU be used in negative-output (inverting) configurations?
Yes, LM2575WU supports inverting buck-boost topology to generate negative output voltages. The datasheet confirms this application with appropriate component selection (e.g., inverted inductor placement and polarity-reversed output capacitor). Output voltage magnitude remains adjustable from 1.23V to 37V, but regulation accuracy and efficiency are slightly lower than in standard buck mode.
Is LM2575WU RoHS compliant?
Yes, LM2575WU is RoHS compliant with the "high-melting solder" exemption, as indicated in the official Micrel ordering information. It meets EU Directive 2011/65/EU requirements and contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits-verified per manufacturer documentation and certified material declarations.
LM2575WU 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
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 1A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
LM2575WU FAQ
1.How can I place an order for LM2575WU through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575WU 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 LM2575WU reliable?
The price and inventory of LM2575WU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575WU is usually 5 days.
3.What payment methods are accepted for LM2575WU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575WU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575WU?
LM2575WU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575WU 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 LM2575WU?
For technical support, including LM2575WU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575WU requirements.
6.How does Aetrix verify that LM2575WU is sourced from the original manufacturer or authorized distributors?
All LM2575WU 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 LM2575WU meets industry standards.
7.What is the process for return or replacement of LM2575WU?
All LM2575WU units undergo pre-shipment inspection (PSI). If there is an issue with LM2575WU, 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 LM2575WU part is unused and in its original packaging.
Return procedure for LM2575WU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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