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Microchip Technology LM2576-12WU-TR
- Part No.:
- LM2576-12WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576-12WU-TR.pdf
- Description:
- IC REG BUCK 12V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,467
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Product details
Overview
LM2576-12WU-TR from Micrel is a fixed-output 12V, 3A step-down (buck) switching regulator in TO-263-5 package, featuring 52kHz fixed-frequency operation, ±3% output voltage tolerance at 12V, 4V–40V input range, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in high-efficiency DC-DC conversion for industrial power supplies and embedded systems.
For engineers reviewing the LM2576-12WU-TR datasheet, LM2576-12WU-TR pinout, LM2576-12WU-TR application, or LM2576-12WU-TR equivalent, key selection criteria include guaranteed 3A output current, 88% efficiency at 25VIN/3A/12VOUT, ON/OFF control with <200µA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576-12WU-TR integrates a 3A N-channel DMOS switch, 1.23V bandgap reference, error amplifier, 52kHz oscillator, and thermal shutdown circuitry in a monolithic buck controller architecture. Its fixed 12V output eliminates external feedback resistors, simplifying design while maintaining ±3% regulation across –40°C to +85°C junction temperature.
Internal frequency compensation and fixed switching frequency enable stable operation with only four external components: input capacitor, output capacitor, catch diode, and power inductor. The ON/OFF pin provides logic-level shutdown with <200µA quiescent current, and the device features built-in cycle-by-cycle current limiting and thermal protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±3% over full load (0.5–3A) and input (15–40V) range - ensures stable rail for microcontrollers and analog circuitry without trimming. |
| Max Output Current | 3A continuous - supports mid-power applications like motor drivers or sensor modules without external current boosting. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial and automotive battery-supplied systems including 12V/24V nominal rails. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 88% at VIN=25V, IOUT=3A, VOUT=12V - significantly reduces thermal load versus linear regulators, often eliminating need for heatsink. |
| Standby Current | <200µA when ON/OFF pin = 5V - enables ultra-low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Protection | Integrated thermal shutdown with automatic recovery - prevents permanent damage during overload or poor heatsinking conditions. |
Pinout & Package
LM2576-12WU-TR uses the 5-lead TO-263 (D²PAK) surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin 3 is internally connected to the die substrate and must be soldered to a large PCB copper area for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Accepts 4–40V unregulated DC; requires ≥100µF low-ESR input capacitor close to pin for stability and ripple suppression. |
| 2 - OUTPUT | Switch node and regulated output | Drives external catch diode and output inductor; connects to output capacitor and load; carries high di/dt switching current. |
| 3 - GND | Power ground and thermal pad | Primary return path for high-current loops; exposed pad must be soldered to ≥1 in² copper pour for θJA ≈ 45°C/W. |
| 4 - FEEDBACK | Internal voltage sense point | Internally tied to 12V divider; not accessible - no external resistor network required for fixed-output operation. |
| 5 - ON/OFF | Logic-controlled enable/disable | Active-high TTL/CMOS-compatible input; drives device into <200µA standby mode when pulled ≥2.2V; floats or grounded to enable. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±3% accuracy across temperature and load. |
| Integrated 3A power switch | Monolithic N-channel DMOS transistor with 1.8V max saturation voltage at 3A - minimizes conduction loss and simplifies external component selection. |
| 52kHz fixed-frequency oscillator | Enables predictable EMI profile and compatibility with low-cost, high-current toroidal inductors (e.g., 330µH, 4A rating) without loop compensation tuning. |
| Thermal shutdown + current limit | Self-protecting operation under short-circuit, overload, or inadequate heatsinking - recovers automatically after fault removal without latch-up. |
| ON/OFF logic control | Direct interface to microcontroller GPIO or system power manager; <200µA shutdown current extends battery life in portable equipment. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24V vehicle battery to stable 12V rail for ECUs and sensors in harsh temperature environments. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 12V supply with thermal robustness and wide input tolerance. Use Value: 88% efficiency at 3A reduces heat generation in confined enclosures; TO-263 thermal pad enables direct mounting to metal chassis for passive cooling. |
Use Scenario: On-board power conversion for door module controllers requiring reliable 12V output from fluctuating 9–16V battery input. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter delivering clean 12V with fast transient response to handle load steps from window motors and locks. Use Value: Built-in current limiting protects against motor stall faults; 4V minimum input supports cold-cranking down to 6V battery voltage. |
| Embedded System Power Rail | LED Driver Pre-regulator |
|
Use Scenario: Generating 12V for FPGA I/O banks, Ethernet PHYs, and analog front-ends in industrial gateways. IC Role / Device Role / Timing Role: High-current, low-noise intermediate regulator supplying downstream LDOs and switching loads. Use Value: 52kHz switching frequency avoids sensitive audio or RF bands; ±3% output tolerance ensures compliance with 12V±5% interface standards. |
Use Scenario: Efficient pre-regulation stage feeding constant-current LED driver ICs in signage or lighting fixtures. IC Role / Device Role / Timing Role: Buck converter stepping down 36V bus to 12V for driver IC bias and gate drive, improving overall system efficiency. Use Value: 3A capability supports multi-string LED arrays; thermal shutdown prevents failure during ambient temperature spikes in enclosed housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-12T | Same electrical specs but TO-220-5 through-hole package; higher θJA (65°C/W) requires heatsink above ~1.5A. | Suitable for prototyping or low-volume through-hole assemblies; less suitable for high-density SMT production. | Select LM2576-12T only if manual assembly or heatsink integration is preferred; LM2576-12WU-TR offers superior thermal performance in automated SMT lines. |
| MP1584EN-LF-Z | 40V input, adjustable output (0.8–25V), 3A, 1.5MHz switching, smaller SOIC-8 package; no integrated thermal pad. | Better for compact designs needing variable output or faster transient response; lacks same level of ruggedness for high-temp industrial use. | Choose MP1584EN-LF-Z when board space is constrained and adjustable output is needed; LM2576-12WU-TR remains preferred for fixed 12V, high-reliability, and thermal-demanding applications. |
Compared with LM2576-12T, LM2576-12WU-TR delivers lower thermal resistance and better power density in SMT layouts; versus MP1584EN-LF-Z, it trades higher-frequency operation for proven ruggedness, simpler magnetics, and stronger fault protection in demanding environments.
Availability
LM2576-12WU-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and embedded system power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LM2576-12WU-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. Known for rugged, application-ready power solutions.
The LM2576 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators in industrial, automotive, and telecom power systems - emphasizing simplicity, reliability, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2576-12WU-TR?
The absolute maximum input voltage for LM2576-12WU-TR is 45V, but the recommended operating range is 4V to 40V. Operation above 40V risks exceeding internal voltage limits and may trigger overvoltage protection or cause permanent damage. For sustained reliability, keep input below 40V with appropriate derating margin.
Does LM2576-12WU-TR require an external feedback resistor network?
No, LM2576-12WU-TR does not require external feedback resistors. As a fixed-output variant, the 12V regulation is implemented internally using a precision-resistor divider. Pin 4 (FEEDBACK) is not accessible externally - this eliminates tuning errors and improves long-term stability compared to adjustable versions.
Can LM2576-12WU-TR operate without a heatsink?
Yes, LM2576-12WU-TR can operate without an external heatsink under typical conditions: at 3A output with 12V input and good PCB copper area (≥1 in² connected to Pin 3). Thermal resistance drops to ~45°C/W with proper layout; however, at 40V input and full 3A load, heatsinking is recommended to maintain junction temperature below 125°C.
What is the purpose of the ON/OFF pin on LM2576-12WU-TR?
The ON/OFF pin (Pin 5) enables logic-level control of LM2576-12WU-TR operation: pulling it ≥2.2V disables the regulator, reducing quiescent current to <200µA; grounding or leaving it open enables normal operation. This feature supports system-level power sequencing and battery-saving sleep modes without external MOSFET switches.
Is LM2576-12WU-TR RoHS compliant?
Yes, LM2576-12WU-TR is RoHS compliant per the manufacturer's documentation, with exemption for "hot-melting solder" as noted in the ordering information. It meets lead-free reflow requirements and contains no restricted substances above threshold limits defined in Directive 2011/65/EU.
LM2576-12WU-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:
- 3A
- 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
LM2576-12WU-TR FAQ
1.How can I place an order for LM2576-12WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576-12WU-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 LM2576-12WU-TR reliable?
The price and inventory of LM2576-12WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576-12WU-TR is usually 5 days.
3.What payment methods are accepted for LM2576-12WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576-12WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576-12WU-TR?
LM2576-12WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576-12WU-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 LM2576-12WU-TR?
For technical support, including LM2576-12WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576-12WU-TR requirements.
6.How does Aetrix verify that LM2576-12WU-TR is sourced from the original manufacturer or authorized distributors?
All LM2576-12WU-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 LM2576-12WU-TR meets industry standards.
7.What is the process for return or replacement of LM2576-12WU-TR?
All LM2576-12WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2576-12WU-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 LM2576-12WU-TR part is unused and in its original packaging.
Return procedure for LM2576-12WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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