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Microchip Technology LM2575-5.0WT
- Part No.:
- LM2575-5.0WT
- Manufacturer:
- Microchip Technology
- Package:
- TO-220-5
- Datasheet:
-
LM2575-5.0WT.pdf
- Description:
- IC REG BUCK 5V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:330
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Product details
Overview
LM2575-5.0WT from Micrel is a fixed-output 5V, 1A monolithic buck switching regulator in TO-220 package, featuring 52kHz fixed-frequency operation, internal current limiting, thermal shutdown, and ±3% output voltage tolerance over line/load conditions. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575-5.0WT datasheet, LM2575-5.0WT pinout, LM2575-5.0WT application, or LM2575-5.0WT equivalent, this page delivers verified specifications, TO-220 pin mapping, real-world use cases for 5V DC-DC conversion, and two validated alternative parts with documented functional and packaging differences.
Technical Context
The LM2575-5.0WT integrates a 52kHz oscillator, error amplifier with 1.23V bandgap reference, PWM comparator, and 1A NPN switch with cycle-by-cycle current limiting. Its feedback loop is internally compensated, eliminating need for external compensation networks.
It operates across 4V–40V input range and delivers regulated 5V ±3% at up to 1A load, with typical efficiency of 82% at 12VIN/5VOUT/1A. Standby quiescent current is ≤200µA when ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over 0.2–1A load and 8–40V input - ensures stable logic supply without external resistors. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, standard 330µH inductors and simplifies EMI filtering design. |
| Max Output Current | 1A continuous - supports microcontroller boards, sensors, and peripheral rails without derating at 25°C. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial, automotive, and battery-backed systems (e.g., 12V/24V nominal). |
| Efficiency | 82% typical at 12VIN, 5VOUT, 1A - reduces thermal load vs. linear regulators; often eliminates heatsink requirement. |
| Standby Current | <200µA when ON/OFF pin = 5V - enables low-power sleep modes in battery-operated equipment. |
| Protection Features | Cycle-by-cycle current limit + thermal shutdown - prevents damage during short-circuit or overload without external circuitry. |
Pinout & Package
LM2575-5.0WT uses a 5-pin TO-220 package with exposed tab (pin 3) electrically connected to GND. The tab serves as primary thermal path and must be mounted to heatsink or copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Unregulated input supply | Accepts 4–40V DC; requires ≥100µF bulk capacitor close to pin for stability and ripple suppression. |
| 2: OUTPUT | Switched output node | Drives external catch diode and inductor; peak current capability is 1A with internal NPN switch. |
| 3: GND | Power ground / tab | Common return for input/output capacitors and inductor; tab must be thermally coupled to PCB copper or heatsink. |
| 4: FEEDBACK | Internal reference sensing | Internally tied to 5V output; not accessible - no external resistor divider required for fixed 5V version. |
| 5: ON/OFF | Enable/disable control | Logic-high (≥2.2V) disables regulator; logic-low (≤1.0V) enables - supports remote power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output | Eliminates feedback resistor network - reduces BOM count, layout area, and calibration risk in production. |
| 52kHz fixed oscillator | Enables predictable EMI profile and compatibility with off-the-shelf 330µH inductors (e.g., AIE 415-0926). |
| Integrated thermal shutdown | Automatically disables output above ~150°C junction temperature - protects against sustained overload or poor heatsinking. |
| ON/OFF pin control | Supports system-level power management via microcontroller GPIO without external MOSFET or level shifter. |
| 100% electrical burn-in | Ensures reliability in industrial environments by screening early-life failures before shipment. |
Applications
| Industrial Power Supply | Microcontroller Board Regulator |
|---|---|
|
Use Scenario: Converting 12V or 24V rail to clean 5V 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 5V to digital logic, ADC references, and communication interfaces. Use Value: Replaces LM7805 with 82% efficiency - cuts heat dissipation by >75%, enabling compact enclosure design without forced air. |
Use Scenario: On-board 5V supply for ARM Cortex-M4-based edge sensor nodes powered from 9–36V DC input. IC Role / Device Role / Timing Role: Main DC-DC converter powering MCU core, flash memory, and UART transceivers. Use Value: Built-in ON/OFF pin allows firmware-controlled deep-sleep mode with <200µA system standby current. |
| POS Terminal Power | Legacy Equipment Retrofit |
|
Use Scenario: Upgrading aging 5V linear supplies in point-of-sale terminals to improve thermal margin and reduce field failure rate. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 7805-based designs where board space and heat are constrained. Use Value: Same TO-220 footprint and pinout as many linear regulators - enables mechanical compatibility with existing heatsinks and mounting holes. |
Use Scenario: Modernizing 1990s test equipment requiring stable 5V from variable 8–36V bench supply. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding low-noise LDOs for analog signal chains. Use Value: 52kHz switching frequency avoids audible noise and simplifies filtering vs. higher-frequency alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-5.0T | Same electrical specs and TO-220 package, but non-RoHS compliant (lead-based solder compatible); no "W" suffix. | Preferred for legacy manufacturing lines requiring high-melting-point solder reflow profiles. | Select LM2575-5.0T only if RoHS exemption for high-melting solder is required and Pb-free compliance is not mandated. |
| MP1584EN-LF-Z | 40V input, 3A output, 1.5MHz switching - smaller inductor size but requires external compensation and feedback resistors. | Better suited for space-constrained designs needing >1A or faster transient response; not pin-compatible. | Choose MP1584EN-LF-Z when board area is critical and design can accommodate 8-pin SOIC layout and external FB network. |
Compared with LM2575-5.0WT, LM2575-5.0T offers identical performance without RoHS compliance, while MP1584EN-LF-Z trades simplicity and thermal robustness for higher integration density and current capability - requiring redesign of feedback and magnetics.
Availability
LM2575-5.0WT is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, and legacy equipment retrofits requiring stable component supply and long-term manufacturability.
Supply support for LM2575-5.0WT 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
Micrel Inc. was a U.S.-based semiconductor company specializing in power management, analog, and mixed-signal ICs, acquired by Microchip Technology in 2015.
The LM2575 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators in industrial and embedded power applications - emphasizing simplicity, thermal resilience, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2575-5.0WT?
The absolute maximum input voltage for LM2575-5.0WT is 45V, but the recommended operating range is 4V to 40V DC. Exceeding 40V may trigger internal protection or reduce lifetime reliability. For 40V operation, ensure adequate thermal management due to increased power dissipation in the internal switch.
Does LM2575-5.0WT require an external feedback resistor network?
No. LM2575-5.0WT is a fixed-output variant with internal feedback divider set for 5.0V; pin 4 (FEEDBACK) is internally connected and not accessible. Unlike adjustable versions (e.g., LM2575), no external R1/R2 network is needed - reducing component count and layout complexity.
Can LM2575-5.0WT be used in negative-output configurations?
Yes - LM2575-5.0WT supports inverting buck-boost topology to generate negative voltages. In that configuration, the device regulates |VOUT| = 5V relative to input ground, with output referenced to VIN instead of GND. Refer to Figure 12 in the original Micrel datasheet for proper component selection and grounding.
What thermal considerations apply to LM2575-5.0WT in TO-220 package?
LM2575-5.0WT has θJA = 65°C/W (no heatsink) and θJC = 2°C/W. At 1A output into 5V with 12V input, power dissipation is ~1.4W - resulting in ~91°C junction rise above ambient without heatsinking. Mounting the tab to ≥4 in² copper area reduces θJA to 45°C/W, keeping TJ within safe limits at +70°C ambient.
Is LM2575-5.0WT RoHS compliant?
Yes. The "W" suffix in LM2575-5.0WT indicates Pb-free/RoHS-compliant construction per EU Directive 2011/65/EU, with exemption for high-melting-point solder (lead content allowed in die attach and lead frame plating). Full compliance documentation is available upon request from Aetrix Electronics.
LM2575-5.0WT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2575-5.0WT FAQ
1.How can I place an order for LM2575-5.0WT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-5.0WT 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 LM2575-5.0WT reliable?
The price and inventory of LM2575-5.0WT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-5.0WT is usually 5 days.
3.What payment methods are accepted for LM2575-5.0WT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-5.0WT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-5.0WT?
LM2575-5.0WT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-5.0WT 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 LM2575-5.0WT?
For technical support, including LM2575-5.0WT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-5.0WT requirements.
6.How does Aetrix verify that LM2575-5.0WT is sourced from the original manufacturer or authorized distributors?
All LM2575-5.0WT 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 LM2575-5.0WT meets industry standards.
7.What is the process for return or replacement of LM2575-5.0WT?
All LM2575-5.0WT units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-5.0WT, 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 LM2575-5.0WT part is unused and in its original packaging.
Return procedure for LM2575-5.0WT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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