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Microchip Technology LM2576WU-TR
- Part No.:
- LM2576WU-TR
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576WU-TR.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,470
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Product details
Overview
LM2576WU-TR from Micrel is a monolithic 3A step-down (buck) switching regulator in TO-263-5 package, featuring fixed 5V output, 52kHz internal oscillator, ±3% output voltage tolerance at 5V, and integrated thermal shutdown and cycle-by-cycle current limiting. It delivers high-efficiency regulation for industrial power supplies requiring compact, low-component-count DC-DC conversion.
For engineers reviewing the LM2576WU-TR datasheet, LM2576WU-TR pinout, LM2576WU-TR application, or LM2576WU-TR equivalent, key selection criteria include guaranteed 3A output current, 4V–40V input range, 52kHz fixed-frequency operation, ON/OFF control with <200µA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576WU-TR integrates a 3A NPN switch, 1.23V bandgap reference, error amplifier, 52kHz oscillator, and thermal/current protection circuitry into a single TO-263-5 package. Its feedback loop uses an external resistor divider to set output voltage - but for the LM2576WU-TR variant, this is factory-trimmed to deliver a fixed 5.0V output.
Operation relies on pulse-width modulation with fixed frequency and internal compensation, eliminating need for external compensation components. The ON/OFF pin enables logic-level shutdown with VIH ≥ 2.2V (min) and VIL ≤ 1.0V (max), supporting system-level power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over full load (0.5–3A) and input (8–40V) range - ensures stable rail for microcontrollers and analog circuitry without external resistors. |
| Max Output Current | Guaranteed 3A continuous - supports mid-power applications like motor drivers or FPGA I/O banks without external current boosting. |
| Input Voltage Range | 4V to 40V - accommodates wide-range unregulated inputs including automotive battery (9–16V), industrial 24V rails, and telecom 48V derivatives. |
| Oscillator Frequency | 52kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330µH) while maintaining EMI below 150kHz CISPR limits. |
| Efficiency | 82% typical at VIN=12V, VOUT=5V, IOUT=3A - reduces thermal load vs. linear regulators, often eliminating need for heatsink in PCB-mounted designs. |
| Standby Current | <200µA when ON/OFF pin = 5V - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload, short-circuit, or ambient temperature excursions up to +85°C. |
Pinout & Package
LM2576WU-TR is housed in a surface-mount TO-263-5 (D²PAK) 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 copper pour for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – VIN | Unregulated input supply connection | Accepts 4–40V DC; requires local 100µF input capacitor to suppress switching transients and reduce EMI. |
| 2 – OUTPUT | Switching node / power output | Drives external catch diode and inductor; connects to LC filter output; peak voltage reaches VIN during switch-off. |
| 3 – GND | Power ground / thermal pad | Primary return path and thermal interface; must be tied to ≥1 in² copper area for θJA ≈ 45°C/W performance. |
| 4 – FEEDBACK | Regulation sense input | Internally connected to 5V reference divider; left unconnected for fixed-output variants - not user-accessible. |
| 5 – ON/OFF | Logic-controlled enable/disable | Active-high control: ≥2.2V enables regulation; ≤1.0V disables output and reduces quiescent current to <200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with no external resistors | Eliminates trimming errors and BOM count; simplifies layout and qualification for cost-sensitive industrial designs. |
| Integrated thermal shutdown and current limit | Enables robust operation under fault conditions without external protection ICs or fuses - critical for sealed enclosures. |
| 52kHz fixed-frequency PWM | Permits use of low-DCR, high-current inductors with minimal core loss; avoids audible noise and eases EMI filtering design. |
| ON/OFF pin with sub-200µA standby | Supports host MCU-controlled power gating for system-level energy management in portable or remote devices. |
| TO-263-5 package with thermal pad | Provides superior thermal performance vs. TO-220 in space-constrained layouts; compatible with standard reflow profiles. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Providing isolated 5V rail for digital I/O expansion cards in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V to regulated 5V for microcontroller, optocouplers, and level-shifters. Use Value: Delivers 3A continuously with 82% efficiency, reducing board temperature rise and enabling convection-only cooling in DIN-rail enclosures. |
Use Scenario: Generating 5V supply for microcontroller, CAN transceiver, and sensor interfaces in vehicle body control units powered by 12V battery. IC Role / Device Role / Timing Role: Main DC-DC converter handling cold-crank (4.5V) to load-dump (40V) transients per ISO 7637-2. Use Value: Wide 4–40V input range and built-in overvoltage/overcurrent protection ensure reliable operation across automotive voltage extremes. |
| Medical Point-of-Care Instrumentation | Networking Edge Device Power |
|
Use Scenario: Supplying clean 5V power to ADCs, op-amps, and low-noise sensors in portable diagnostic equipment powered by Li-ion battery packs. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding LDOs that generate ultra-low-noise analog rails. Use Value: 82% efficiency extends battery life; fixed 5V output eliminates resistor drift concerns affecting measurement accuracy. |
Use Scenario: Converting 48V PoE-derived input to 5V for Ethernet PHYs, microprocessors, and USB peripherals in industrial gateways. IC Role / Device Role / Timing Role: High-current intermediate-stage regulator before point-of-load converters. Use Value: TO-263 thermal pad enables mounting on inner copper layers for improved heat spreading in multi-layer PoE-powered PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-5.0 | TO-220-5 through-hole package; identical electrical specs but higher θJA (65°C/W) and no thermal pad. | Preferred for prototyping or low-volume manual assembly where thermal mass of heatsink is acceptable. | Select when mechanical mounting constraints favor through-hole or when heatsink integration is feasible. |
| MP1584EN-LF-Z | 40V input, 3A sync-buck; 1.5MHz switching, smaller external components, but requires external compensation and lacks ON/OFF pin. | Better suited for space-constrained designs needing higher frequency, but adds complexity in stability tuning. | Choose for compact consumer-grade designs where PCB area is premium and thermal budget allows higher switching losses. |
Compared with LM2576T-5.0, the LM2576WU-TR offers superior thermal performance in surface-mount layouts; versus MP1584EN-LF-Z, it trades higher frequency for simpler design, proven reliability, and integrated enable control - making it ideal for industrial applications prioritizing robustness over miniaturization.
Availability
LM2576WU-TR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for LM2576WU-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 RF solutions before its acquisition by Microchip Technology in 2015. Known for rugged, application-ready ICs with strong industrial heritage.
The LM2576 series was designed specifically for cost-sensitive, high-reliability DC-DC conversion in industrial and automotive environments - emphasizing simplicity, thermal resilience, and wide-input operation without complex external circuitry.
FAQ
What is the maximum input voltage rating for the LM2576WU-TR?
The LM2576WU-TR has an absolute maximum input voltage rating of 45V, with recommended operating range from 4V to 40V. Exceeding 40V during normal operation risks violating the guaranteed output regulation and thermal limits specified in the datasheet. Transient spikes beyond 40V must be clamped externally using TVS diodes or transient suppressors to protect the internal switch.
Does the LM2576WU-TR require external compensation components?
No, the LM2576WU-TR does not require external compensation components. It features fully internal frequency compensation optimized for standard 330µH inductors and 330–470µF output capacitors. This eliminates stability tuning effort and reduces bill-of-materials count - a key advantage over current-mode controllers requiring external RC networks.
Can the LM2576WU-TR be used in a negative-output (inverting) configuration?
Yes, the LM2576WU-TR can be configured as a negative-output buck-boost converter by repositioning the inductor and diode. The datasheet explicitly lists "Positive to negative converter (inverting Buck-Boost)" as a typical application. However, output polarity inversion requires careful layout to manage ground bounce and EMI, and output voltage regulation accuracy degrades slightly due to feedback path limitations.
What is the thermal resistance (θJA) of the LM2576WU-TR in standard PCB layout?
For the LM2576WU-TR in TO-263-5 package, θJA is 45°C/W when mounted on a PCB with approximately 1 square inch of copper surrounding the leads and thermal pad. This value assumes proper soldering of the exposed pad to an internal ground plane. Without adequate copper area, θJA rises significantly - potentially exceeding 70°C/W - which may trigger thermal shutdown under full 3A load at elevated ambient temperatures.
Is the LM2576WU-TR RoHS compliant?
Yes, the LM2576WU-TR is RoHS compliant per the manufacturer's ordering information, with exemption for "hot-melting solder" as noted in the original Micrel documentation. It meets EU Directive 2011/65/EU requirements for lead-free packaging and restricted substances, and is suitable for use in environmentally regulated industrial and medical products.
LM2576WU-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:
- 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:
- 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
LM2576WU-TR FAQ
1.How can I place an order for LM2576WU-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576WU-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 LM2576WU-TR reliable?
The price and inventory of LM2576WU-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576WU-TR is usually 5 days.
3.What payment methods are accepted for LM2576WU-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576WU-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576WU-TR?
LM2576WU-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576WU-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 LM2576WU-TR?
For technical support, including LM2576WU-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576WU-TR requirements.
6.How does Aetrix verify that LM2576WU-TR is sourced from the original manufacturer or authorized distributors?
All LM2576WU-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 LM2576WU-TR meets industry standards.
7.What is the process for return or replacement of LM2576WU-TR?
All LM2576WU-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2576WU-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 LM2576WU-TR part is unused and in its original packaging.
Return procedure for LM2576WU-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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