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onsemi LM2576T-15G
- Part No.:
- LM2576T-15G
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-15G.pdf
- Description:
- IC REG BUCK 15V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,659
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Product details
Overview
LM2576T-15G 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 and embedded DC-DC conversion.
For engineers reviewing the LM2576T-15G 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 (e.g., Pulse PE-92108).
Technical Context
The LM2576T-15G integrates a 3.0 A NPN switch, 1.23 V bandgap reference, error amplifier, 52 kHz oscillator, and PWM comparator in a single TO-220-5 package. Its fixed 15 V output eliminates external feedback resistors, simplifying design while maintaining regulation across −40 °C to +125 °C junction temperature.
It uses voltage-mode control with cycle-by-cycle current limiting and thermal shutdown for fault protection. The ON/OFF pin enables logic-level shutdown with 80 µA standby current, and saturation voltage is specified at ≤2.0 V (max) over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over line, load, and −40 °C to +125 °C - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Output Current | Guaranteed 3.0 A continuous - supports high-current loads such as microcontroller cores, FPGAs, or motor drivers without external parallel stages. |
| Input Voltage Range | 18 V to 40 V DC - compatible with 24 V industrial bus, automotive battery systems (with transient suppression), and telecom rectified inputs. |
| Switching Frequency | 52 kHz (±10% over 0–125 °C) - enables use of low-cost, high-saturation-current inductors (e.g., 100 µH Pulse PE-92108) and reduces EMI filtering complexity. |
| Efficiency | 88% typical at 18 V input, 3.0 A load - minimizes thermal dissipation, often eliminating need for heatsink in moderate ambient conditions. |
| Protection Features | Cycle-by-cycle current limit (3.5–7.5 A peak), thermal shutdown, and 80 µA standby current in shutdown - provides robust fault recovery and low-power sleep mode. |
Pinout & Package
LM2576T-15G is housed in a TO-220-5 package (Case 314D), with heatsink surface electrically connected to Pin 3 (GND). The package supports vertical mounting with optional heatsinking via the exposed tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 18–40 V unregulated DC; requires local 100 µF low-ESR electrolytic bypass capacitor to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 15 V; PCB copper area must be minimized to reduce coupling into sensitive circuits. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, diode cathode, and heatsink tab - must be single-point grounded per layout guidelines. |
| 4 - Feedback | Regulation sense input | Internally tied to 15 V divider; unused in fixed-output version - leave unconnected or tie to GND if unused per datasheet recommendation. |
| 5 - ON/OFF | Logic-enable control | TTL-compatible: <1.4 V = ON, >2.2 V = OFF; draws ≤30 µA when active, enabling low-power system sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates external feedback resistors and associated drift/error - reduces BOM count and improves long-term stability. |
| 52 kHz fixed-frequency oscillator | Enables predictable EMI spectrum and compatibility with standardized inductor families (e.g., Pulse PE-92108, Renco RL2444). |
| Thermal shutdown + current limit | Self-protecting under overload or short-circuit - prevents device destruction and allows automatic recovery after fault removal. |
| TTL shutdown capability | Supports microcontroller-controlled power sequencing with only 80 µA standby current - ideal for battery-backed or energy-conscious systems. |
Applications
| Industrial PLC Power Supply | Embedded Microcontroller Board |
|---|---|
Use Scenario: Provides primary 15 V rail for programmable logic controller I/O modules operating from 24 V DC field bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V field power to stable 15 V for analog sensor interfaces and relay drivers. Use Value: Delivers 3.0 A continuously with 88% efficiency, reducing heat buildup in enclosed cabinets and eliminating need for forced air cooling. | Use Scenario: Generates 15 V supply for FPGA configuration circuitry and high-speed ADC reference buffers on compact embedded evaluation boards. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter ensuring clean, low-noise 15 V rail independent of main system 5 V or 3.3 V domains. Use Value: Fixed 15 V output avoids resistor tolerance errors; ±4% accuracy maintains ADC reference integrity across temperature and load variation. |
| Automotive Aftermarket Module | Test Equipment Power Stage |
Use Scenario: Powers CAN transceiver and microcontroller in vehicle diagnostic tool powered from 12 V battery (with boost or wide-input front-end). IC Role / Device Role / Timing Role: Secondary buck stage delivering regulated 15 V for op-amp signal conditioning and display backlight drivers. Use Value: Wide 18–40 V input range accommodates boosted battery rails; thermal shutdown protects against engine-bay temperature excursions up to +125 °C. | Use Scenario: Supplies 15 V to precision op-amp test fixtures requiring low-drift, high-current sourcing during calibration cycles. IC Role / Device Role / Timing Role: High-current, fixed-voltage regulator providing stable bias for multi-channel instrumentation amplifiers. Use Value: 3.0 A output supports simultaneous drive of multiple DUTs; 52 kHz frequency simplifies EMI filter design for lab-grade noise performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVT-15 | Same pinout, same electrical specs, but rated for 60 V max input (vs. 40 V for LM2576T-15G) and higher junction temp (150 °C vs. 125 °C). | Suitable for 48 V telecom or industrial systems where input transients exceed 40 V. | Select LM2576HVT-15 only if input voltage may exceed 40 V or ambient exceeds 85 °C with limited heatsinking. |
| MP1584EN-LF-Z | 3 A, 15 V adjustable (not fixed); 1.5 MHz switching (vs. 52 kHz); smaller SOIC-8 package; no integrated catch diode required. | Better suited for space-constrained designs needing higher efficiency at light loads, but requires external feedback resistors and careful layout for EMI. | Choose MP1584EN-LF-Z when board area is critical and 1.5 MHz operation is acceptable; avoid if fixed 15 V simplicity and proven 52 kHz EMI profile are priorities. |
Compared with LM2576HVT-15 and MP1584EN-LF-Z, the LM2576T-15G offers lowest design risk for cost-sensitive, thermally stable 15 V buck applications - leveraging mature 52 kHz architecture, fixed output, TO-220 thermal mass, and broad inductor compatibility without layout sensitivity.
Availability
LM2576T-15G is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded microcontroller boards, automotive aftermarket modules, and test equipment power stages requiring stable component supply and long-term manufacturability.
Supply support for LM2576T-15G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was designed for simple, robust, high-current DC-DC conversion in cost-sensitive industrial and embedded systems - prioritizing ease of use, thermal resilience, and compatibility with standard passive components.
FAQ
What is the maximum input voltage rating for LM2576T-15G?
The LM2576T-15G has an absolute maximum input voltage of 45 V, but its guaranteed operational input range is 18 V to 40 V DC. Operation above 40 V risks exceeding specified line regulation and thermal limits; for 48 V systems, consider the LM2576HVT-15 variant instead. Always observe derating curves in the official onsemi datasheet for LM2576T-15G.
Does LM2576T-15G require an external catch diode?
Yes, the LM2576T-15G requires an external Schottky catch diode (e.g., MBR360 or 1N5822) connected between the Output (Pin 2) and GND (Pin 3). This diode provides the freewheeling path during the switch "off" period. The datasheet specifies minimum 3.0 A average current rating and ≥20 V reverse voltage - using an underspecified diode causes overheating and failure of the LM2576T-15G.
Can LM2576T-15G be used in adjustable-output configurations?
No - the LM2576T-15G is a fixed 15 V output variant. Its internal feedback divider is trimmed and not accessible; Pin 4 (Feedback) is internally connected and must remain unconnected or grounded per datasheet guidance. For adjustable output, use the LM2576-ADJ variant instead, which exposes Pin 4 for external resistor programming.
What is the thermal resistance (junction-to-case) for LM2576T-15G in TO-220 package?
The LM2576T-15G in TO-220-5 (Case 314D) has a junction-to-case thermal resistance (RJC) of 5.0 °C/W. This value assumes proper mechanical mounting to a heatsink via the exposed tab (Pin 3/GND). Actual thermal performance depends on interface material, heatsink size, and airflow - refer to Figure 4 (Dropout Voltage) and thermal derating curves in the LM2576T-15G datasheet for safe operating area limits.
Is LM2576T-15G RoHS-compliant and lead-free?
Yes, the LM2576T-15G is offered in Pb-Free packages compliant with RoHS Directive 2011/65/EU. The "G" suffix in the part number explicitly denotes lead-free, halogen-free construction. Moisture Sensitivity Level (MSL) is rated at Level 1 - no floor life limitation and no baking required prior to reflow soldering.
LM2576T-15G 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-15G FAQ
1.How can I place an order for LM2576T-15G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-15G 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-15G reliable?
The price and inventory of LM2576T-15G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-15G is usually 5 days.
3.What payment methods are accepted for LM2576T-15G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-15G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-15G?
LM2576T-15G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-15G 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-15G?
For technical support, including LM2576T-15G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-15G requirements.
6.How does Aetrix verify that LM2576T-15G is sourced from the original manufacturer or authorized distributors?
All LM2576T-15G 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-15G meets industry standards.
7.What is the process for return or replacement of LM2576T-15G?
All LM2576T-15G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-15G, 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-15G part is unused and in its original packaging.
Return procedure for LM2576T-15G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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