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Microchip Technology LM2575-12WU-TR
- Part No.:
- LM2575-12WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575-12WU-TR.pdf
- Description:
- IC REG BUCK 12V 1A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:395
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Product details
Overview
LM2575-12WU-TR from Micrel is a fixed-output 12V, 1A step-down (buck) switching regulator in TO-263-5 package with 52kHz internal oscillator, ±3% output voltage tolerance over line/load, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575-12WU-TR datasheet, LM2575-12WU-TR pinout, LM2575-12WU-TR application, or LM2575-12WU-TR equivalent, key selection criteria include input voltage range (4–40V), guaranteed 1A output, standby current <200µA, and compatibility with standard off-the-shelf inductors for rapid design implementation.
Technical Context
The LM2575-12WU-TR integrates a 52kHz fixed-frequency oscillator, error amplifier with 1.23V bandgap reference, PWM comparator, and 1A NPN switch with saturation voltage ≤1.4V. Its feedback loop uses an internal voltage divider for fixed 12V output, eliminating external resistor networks.
Thermal shutdown activates at TJ ≥150°C; current limit triggers at peak switch current ≥1.3A. The ON/OFF pin supports logic-level control with VIH ≥2.4V and VIL ≤0.8V, enabling low-power system sequencing without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±3% over 0.2–1A load and 15–40V input ensures stable rail for microcontrollers and analog circuitry. |
| Max Output Current | 1A continuous output enables direct powering of FPGA I/O banks or sensor signal chains without derating. |
| Input Voltage Range | 4V to 40V input supports wide-range DC sources including automotive battery (9–16V) and industrial 24V rails. |
| Switching Frequency | 52kHz fixed frequency simplifies EMI filtering and allows use of low-cost, high-saturation-current inductors. |
| Efficiency | 88% typical at 25V input/12V output/1A load reduces thermal load and eliminates need for heatsink in most PCB layouts. |
| Standby Current | <200µA when ON/OFF pin = 5V enables low-power sleep modes in battery-backed systems. |
| Protection Features | Integrated thermal shutdown and cycle-by-cycle current limiting prevent damage during overload or short-circuit events. |
Pinout & Package
LM2575-12WU-TR uses the 5-pin TO-263 (D²PAK) surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin 1 is VIN, Pin 2 is OUTPUT, Pin 3 is GND, Pin 4 is FEEDBACK (internally connected to fixed 12V divider), and Pin 5 is ON/OFF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Accepts 4–40V unregulated DC; requires local 100µF input capacitor for stability and EMI suppression. |
| 2 - OUTPUT | Switched output node | Drives external catch diode and output inductor; connects to LC filter for regulated 12V output. |
| 3 - GND | Power ground reference | Common return for internal switch, error amp, and thermal sensor; must be low-impedance PCB plane. |
| 4 - FB | Feedback input | Internally tied to fixed 12V divider; not user-accessible-no external resistors required. |
| 5 - ON/OFF | Enable/disable control | Logic-high (≥2.4V) enables regulation; logic-low (≤0.8V) disables output and reduces quiescent current to <200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity in cost-sensitive designs. |
| 52kHz switching frequency | Enables use of compact, low-DCR inductors (e.g., 330µH) while keeping EMI below CISPR-22 Class B limits. |
| 1A guaranteed output | Supports full-load operation across –40°C to +125°C junction temperature without external current sensing. |
| Thermal shutdown | Automatically disables regulator at 150°C junction temperature, preventing permanent damage during sustained overload. |
| ON/OFF logic control | Allows system-level power sequencing via microcontroller GPIO without level-shifting or additional drivers. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converts 24V vehicle battery to stable 12V for MCU, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, ripple-controlled 12V rail with fast transient response. Use Value: 88% efficiency minimizes heat buildup in sealed enclosures; ON/OFF pin enables ignition-synchronized power gating. |
Use Scenario: Generates 12V from 9–16V automotive battery for microcontroller core and peripheral rails. IC Role / Device Role / Timing Role: Main DC-DC converter delivering regulated 12V with built-in fault protection for harsh environments. Use Value: Thermal shutdown and current limiting ensure reliability during cold-crank (4.5V) and load-dump (40V) transients. |
| Factory Automation Sensor Hub | Point-of-Sale Terminal Power |
Use Scenario: Powers multiple analog sensors and RS-485 transceivers from 24V factory bus. IC Role / Device Role / Timing Role: Central step-down regulator feeding downstream LDOs and signal conditioning circuits. Use Value: Fixed 12V output eliminates calibration drift; 52kHz frequency avoids interference with 4–20mA loop frequencies. |
Use Scenario: Supplies 12V to thermal printer head, display backlight, and payment interface ICs from 12–24V AC/DC adapter. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing heat in compact retail enclosures. Use Value: TO-263 package enables 1A output with minimal board area; <200µA standby current extends battery backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-12T | TO-220-5 package; higher θJA (65°C/W vs. 45°C/W for TO-263); same electrical specs. | Suitable for through-hole prototyping or low-volume assemblies where thermal mass of TO-220 suffices. | Select LM2575-12T only if manual assembly or heatsink mounting is preferred; LM2575-12WU-TR offers superior thermal performance in SMT production. |
| LM2596-12 | 150kHz switching frequency; 3A output rating; requires different inductor value (68µH vs. 330µH). | Better suited for higher-current or space-constrained designs needing smaller magnetics. | LM2596-12 is not drop-in compatible-requires redesign of LC filter and feedback compensation; choose only when >1A output or higher frequency is mandatory. |
Compared with LM2575-12T, LM2575-12WU-TR delivers lower thermal resistance and automated assembly compatibility; versus LM2596-12, it trades higher current and frequency for proven 52kHz EMI behavior and simpler inductor selection in industrial environments.
Availability
LM2575-12WU-TR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and point-of-sale equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575-12WU-TR 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 before its acquisition by Microchip Technology in 2015. It emphasized rugged, easy-to-use power solutions for industrial and automotive markets.
The LM2575 series was designed as a simple, high-efficiency replacement for three-terminal linear regulators-targeting cost-sensitive, thermally constrained applications where minimal external components and robust protection were critical.
FAQ
What is the maximum input voltage for LM2575-12WU-TR?
The absolute maximum input voltage for LM2575-12WU-TR is 45V, but the recommended operating range is 4V to 40V. Operation above 40V risks exceeding internal transistor breakdown limits and invalidates the ±3% output voltage guarantee. For automotive applications with load-dump transients, external clamping (e.g., TVS diode) is advised to keep VIN within 40V.
Does LM2575-12WU-TR require external feedback resistors?
No, LM2575-12WU-TR does not require external feedback resistors. It is a fixed-output variant with internal resistor divider setting the regulated output to 12V. Pin 4 (FB) is internally connected and must not be modified-adding external components will disrupt regulation and may cause instability or overvoltage.
What inductor value is recommended for LM2575-12WU-TR?
A 330µH inductor with ≥1.5A saturation current is recommended for LM2575-12WU-TR per Micrel's typical application circuit. This value balances ripple current (≈30% of 1A load), core losses, and physical size. Inductors rated for 52kHz operation and with low DCR (<0.3Ω) ensure ≥88% efficiency at full load.
Can LM2575-12WU-TR be used in negative-output configurations?
Yes, LM2575-12WU-TR can be used in inverting buck-boost topology to generate negative voltages, as documented in Micrel's application notes. However, the output polarity is inverted, and the 12V specification refers to magnitude-not polarity-so the resulting rail would be –12V. Input voltage range and protection features remain valid.
Is LM2575-12WU-TR RoHS compliant?
Yes, LM2575-12WU-TR is RoHS compliant with the "high-melting solder" exemption, as confirmed in Micrel's ordering information table. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is suitable for environmentally regulated industrial and consumer products.
LM2575-12WU-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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):
- 12V
- Voltage - Output (Max):
- -
- 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
LM2575-12WU-TR FAQ
1.How can I place an order for LM2575-12WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-12WU-TR 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 LM2575-12WU-TR reliable?
The price and inventory of LM2575-12WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-12WU-TR is usually 5 days.
3.What payment methods are accepted for LM2575-12WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-12WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-12WU-TR?
LM2575-12WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-12WU-TR 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 LM2575-12WU-TR?
For technical support, including LM2575-12WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-12WU-TR requirements.
6.How does Aetrix verify that LM2575-12WU-TR is sourced from the original manufacturer or authorized distributors?
All LM2575-12WU-TR 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 LM2575-12WU-TR meets industry standards.
7.What is the process for return or replacement of LM2575-12WU-TR?
All LM2575-12WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-12WU-TR, 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 LM2575-12WU-TR part is unused and in its original packaging.
Return procedure for LM2575-12WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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