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onsemi LM2576T-015
- Part No.:
- LM2576T-015
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-015.pdf
- Description:
- IC REG BUCK 15V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,199
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Product details
Overview
LM2576T-015 from onsemi is a monolithic 3.0 A, 15 V fixed-output step-down (buck) switching regulator in TO-220 package. It operates from 18–40 V input, delivers ±4% output voltage accuracy over line/load/temperature, features 52 kHz internal oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF control - used in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2576T-015 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 15 V fixed output with ±4% tolerance, 52 kHz fixed-frequency operation, thermal protection, and compatibility with standard off-the-shelf inductors and Schottky catch diodes.
Technical Context
The LM2576T-015 integrates a 3.0 A NPN switch, 1.23 V bandgap reference, error amplifier, 52 kHz oscillator, and PWM comparator in a single TO-220 package. Its fixed 15 V output eliminates external feedback resistors, simplifying design versus adjustable versions.
It employs voltage-mode control with cycle-by-cycle current limiting and thermal shutdown for fault protection. The internal 1.23 V reference feeds the error amplifier's non-inverting input via an internal resistor divider; no external components are needed for regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over −40 °C to +125 °C, 0.5–3.0 A load, 18–40 V input - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Max Output Current | 3.0 A continuous - supports medium-power loads such as microcontrollers, sensors, or motor drivers without external current boosting. |
| Input Voltage Range | 7–40 V DC - accommodates wide-input industrial or automotive battery-derived supplies, including 24 V nominal systems. |
| Oscillator Frequency | 52 kHz (±10% over temp) - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | 88% at 18 V input, 3.0 A load - minimizes heat generation, often eliminating need for heatsink in moderate ambient conditions. |
| Standby Current | 80 µA typical at 25 °C when ON/OFF pin ≥2.4 V - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Protection | Internal thermal shutdown activates at ~150 °C junction temperature - prevents catastrophic failure during overload or poor heatsinking. |
Pinout & Package
LM2576T-015 uses the TO-220-5 (Case 314D) package with heatsink surface electrically connected to Pin 3 (GND). Mounting tab must be isolated from chassis unless GND is chassis-referenced.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR capacitor to suppress switching transients and supply peak currents. |
| 2 - Output | Emiter of internal NPN switch | Drives inductor; saturation voltage ≤2.0 V at full load - contributes directly to conduction loss and thermal dissipation. |
| 3 - GND | Circuit ground reference | Common return for input cap, output cap, feedback network, and heatsink tab - must be low-impedance single-point connection per layout guidelines. |
| 4 - Feedback | Regulation sense input | Internally tied to 15 V output divider; unused in fixed version - leave unconnected or tie to GND if unused per datasheet recommendation. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (≥2.4 V) disables regulator, reducing quiescent current to 80 µA; logic-low (<0.8 V) or open enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates external feedback resistors, reducing BOM count, layout complexity, and calibration drift risk in production. |
| 3.0 A guaranteed output | Supports full-load operation across temperature and input range without derating - simplifies thermal design for 15 V/45 W applications. |
| 52 kHz fixed-frequency operation | Enables use of cost-effective, high-current pulse inductors (e.g., Pulse PE-92108) and avoids audible noise in sensitive environments. |
| TTL shutdown capability | Allows system-level power sequencing and low-power standby modes using standard logic-level signals without level-shifting. |
| Integrated protection | Cycle-by-cycle current limiting and thermal shutdown provide robust fault tolerance - reduces need for external fusing or monitoring circuits. |
Applications
| Industrial 24 VDC Power Supply | Embedded Controller Auxiliary Rail |
|---|---|
Use Scenario: Converting 24 V industrial bus to stable 15 V for PLC I/O modules or sensor signal conditioning. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 15 V rail with high efficiency and built-in fault protection. Use Value: Delivers 3.0 A at 88% efficiency, reducing thermal load and enabling compact enclosure design without forced air cooling. | Use Scenario: Generating 15 V auxiliary supply for FPGA configuration, ADC reference, or op-amp bias in edge computing gateways. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter supplying clean, well-regulated 15 V independent of main system rail fluctuations. Use Value: ±4% output tolerance and low 52 kHz ripple ensure stable analog performance and reliable digital startup sequences. |
| Test Equipment Power Module | Legacy Instrumentation Retrofit |
Use Scenario: Replacing linear regulators in benchtop multimeters or oscilloscope front-end supplies to improve thermal management. IC Role / Device Role / Timing Role: High-efficiency step-down regulator replacing obsolete 7815 linear ICs in existing designs. Use Value: Reduces power dissipation by >70% vs. linear solution at 18 V input, extending equipment lifetime and lowering fan requirements. | Use Scenario: Upgrading aging 15 V power rails in medical analyzers or laboratory instruments where board space and reliability are critical. IC Role / Device Role / Timing Role: Drop-in compatible replacement for legacy 15 V switching regulators with identical pinout and footprint. Use Value: TO-220-5 package matches common heatsink footprints; integrated protection improves MTBF over discrete implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVT-15 | Higher input voltage rating (63 V max vs. 40 V), same 15 V output, TO-220-5 package, identical pinout and electrical specs except VIN(max). | Suitable for 48 V telecom or PoE-powered systems where input surge or transient exposure exceeds 40 V. | Select LM2576HVT-15 only if input may exceed 40 V; otherwise LM2576T-015 offers optimal cost/performance for standard 24 V industrial use. |
| MP1584EN-LF-Z | 3 A, 15 V adjustable version (requires R1/R2), 1.5 MHz switching frequency, SOIC-8 package, no integrated thermal shutdown. | Better suited for space-constrained PCBs but requires external feedback network and additional protection circuitry. | Choose MP1584EN-LF-Z only when board area is critical and design can accommodate higher-frequency layout constraints and added components. |
Compared with LM2576HVT-15 and MP1584EN-LF-Z, the LM2576T-015 provides fixed 15 V output with no external resistors, robust thermal/current protection, and proven 52 kHz design simplicity - making it ideal for cost-sensitive, thermally demanding, or legacy-compatible industrial power supplies.
Availability
LM2576T-015 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded controller power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2576T-015 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, and IoT applications.
The LM2576 series was designed specifically for simple, high-efficiency, medium-current DC/DC conversion in cost-sensitive industrial and instrumentation systems - emphasizing ease of use, minimal external parts, and rugged fault protection.
FAQ
What is the maximum input voltage for LM2576T-015?
The LM2576T-015 has a maximum rated input voltage of 40 V DC. Absolute maximum supply voltage is 45 V, but operation above 40 V violates recommended operating conditions and risks reliability degradation. For inputs exceeding 40 V, consider the LM2576HVT-15, which supports up to 63 V.
Does LM2576T-015 require external feedback resistors?
No. The LM2576T-015 is a fixed 15 V output version - its internal resistor divider sets the output voltage, eliminating the need for external feedback resistors. Pin 4 (Feedback) is internally connected and should remain unconnected or tied to GND per the datasheet.
What is the thermal resistance of LM2576T-015 in TO-220 package?
The LM2576T-015 in Case 314D (TO-220-5) has a thermal resistance of 65 °C/W (junction-to-ambient) and 5.0 °C/W (junction-to-case). Effective heatsinking via the tab (Pin 3/GND) is essential to maintain junction temperature below 150 °C at full 3.0 A load.
Can LM2576T-015 be used in negative-output configurations?
Yes - the LM2576T-015 can be configured as a positive-to-negative buck-boost converter (inverting topology) per Figure 1 in the datasheet. In this mode, Pin 2 (Output) becomes the negative output node, and Pin 3 (GND) serves as the system ground reference.
What catch diode is recommended for LM2576T-015?
The datasheet recommends the MBR360 Schottky diode (3 A, 60 V) for LM2576T-015. It meets the 1.2× load current (≥3.6 A) and 1.25× max input voltage (≥50 V) requirements, with low forward voltage to maximize efficiency and minimize thermal stress.
LM2576T-015 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- 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
LM2576T-015 FAQ
1.How can I place an order for LM2576T-015 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-015 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 LM2576T-015 reliable?
The price and inventory of LM2576T-015 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-015 is usually 5 days.
3.What payment methods are accepted for LM2576T-015?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-015 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-015?
LM2576T-015 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-015 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 LM2576T-015?
For technical support, including LM2576T-015 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-015 requirements.
6.How does Aetrix verify that LM2576T-015 is sourced from the original manufacturer or authorized distributors?
All LM2576T-015 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 LM2576T-015 meets industry standards.
7.What is the process for return or replacement of LM2576T-015?
All LM2576T-015 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-015, 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 LM2576T-015 part is unused and in its original packaging.
Return procedure for LM2576T-015:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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