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Texas Instruments LM2576T-15
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- Part No.:
- LM2576T-15
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-15.pdf
- Description:
- IC REG BUCK 15V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,882
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Product details
Overview
LM2576T-15 from Texas Instruments is a monolithic 3-A non-synchronous step-down (buck) DC-DC switching regulator in TO-220-5 package, delivering fixed 15-V output with ±4% tolerance over line and load, 52-kHz fixed-frequency operation, and TTL-compatible ON/OFF control. It replaces linear regulators in high-current industrial power supplies where thermal efficiency and minimal external component count are critical.
For engineers reviewing the LM2576T-15 datasheet, LM2576T-15 pinout, LM2576T-15 application, or LM2576T-15 equivalent, key selection considerations include its 40-V max input voltage, 3-A continuous output current capability, integrated cycle-by-cycle current limiting, thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576T-15 implements a fixed-frequency PWM buck topology with an internal 52-kHz oscillator and a single NPN power switch. Its error amplifier compares a resistive feedback signal (internally tied to output for fixed versions) against a 1.23-V bandgap reference to regulate output voltage.
It operates in active mode when the ON/OFF pin voltage is below 1.2 V, entering shutdown with 50-μA standby current when pin voltage exceeds 1.4 V. Protection includes cycle-by-cycle current limiting (typical 5.8-A limit), thermal shutdown, and undervoltage lockout via external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over full line/load/temperature range - ensures stable rail for motor drivers or analog subsystems without external feedback divider. |
| Max Input Voltage | 40 V - supports wide-input industrial or automotive battery-derived supplies without pre-regulation. |
| Output Current | 3 A continuous - delivers sufficient power for mid-power embedded systems, eliminating need for parallel regulators. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 88% at VIN = 18 V, IOUT = 3 A - significantly reduces heat sink size versus linear regulators, enabling compact convection-cooled designs. |
| Standby Current | 50 μA typical - allows low-power system-level sleep modes without compromising fast wake-up response. |
| Saturation Voltage | 1.8 V max at 3 A - defines minimum dropout (VIN − VOUT) ≈ 1.8 V + diode drop, setting practical lower input limit for regulation. |
Pinout & Package
LM2576T-15 uses the KC (TO-220-5) package with 10.16 mm × 8.51 mm body size and integral heat slug connected to GND. The tab must be thermally coupled to a heatsink or large copper pour for reliable 3-A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Power input | Connects to high-side transistor collector; requires short, low-inductance path to input capacitor to minimize switching noise and voltage spikes. |
| 2: OUTPUT | Switching node | Emitter of internal NPN switch; drives external catch diode and inductor - high dv/dt node requiring careful layout and ground return. |
| 3: GROUND | Power and signal reference | Common return for input/output capacitors and feedback; must be low-impedance path to minimize noise coupling into error amplifier. |
| 4: FEEDBACK | Voltage sense input | Internally connected to output for fixed 15-V version; left unconnected externally - not used in this variant. |
| 5: ON/OFF | Enable control | TTL-compatible logic input: <1.2 V = active, >1.4 V = shutdown; floating state defaults to ON but must be pulled to GND for guaranteed operation. |
| TAB | Thermal & electrical ground | Internally bonded to GND; serves as primary thermal path - must be soldered to heatsink or PCB copper area ≥1 in² for rated current. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15-V output | Eliminates external resistor divider, reducing BOM count and improving long-term output stability vs. adjustable variants. |
| Integrated current limiting | 5.8-A typical cycle-by-cycle peak limit prevents catastrophic failure during short-circuit or overload without external sensing components. |
| TTL shutdown interface | Enables system-level power sequencing and low-power sleep states with microcontroller GPIO, consuming only 50 μA in standby. |
| Thermal shutdown protection | Automatically disables switching above 150°C junction temperature, preventing permanent damage during transient overloads or poor heatsinking. |
| Standard inductor compatibility | Optimized for widely available 150-μH shielded power inductors, simplifying design validation and reducing time-to-market for industrial power supplies. |
Applications
| Motor Drives | Industrial Test Equipment |
|---|---|
Use Scenario: Powering gate drivers and logic rails in 24-V DC motor controllers for factory automation. IC Role / Device Role / Timing Role: Primary 15-V intermediate bus regulator converting unregulated 24–40-V supply to clean, regulated rail for MOSFET drivers and microcontrollers. Use Value: Delivers 3-A continuous current with 88% efficiency, minimizing thermal stress on PCB and enabling compact enclosure design without forced air cooling. | Use Scenario: Providing stable 15-V bias for precision op-amps and ADC reference circuits in benchtop multimeters. IC Role / Device Role / Timing Role: Low-noise, high-stability DC-DC converter supplying analog front-end circuitry with tight line/load regulation (±4%). Use Value: Fixed-output architecture eliminates feedback resistor drift, ensuring consistent 15-V accuracy across temperature and aging - critical for measurement repeatability. |
| Merchant Server PSU | Home Appliances |
Use Scenario: Generating auxiliary 15-V rail in distributed power architecture for network switch management modules. IC Role / Device Role / Timing Role: Secondary-side buck regulator deriving isolated 15-V from 48-V backplane, supporting hot-swap and remote ON/OFF control. Use Value: TTL-compatible ON/OFF pin enables centralized power sequencing and fault isolation without additional level-shifting circuitry. | Use Scenario: Supplying control board logic and display backlight in smart refrigerators operating from 36-V battery or rectified AC. IC Role / Device Role / Timing Role: Robust main power converter handling wide input transients (e.g., load dump) while maintaining 15-V output for MCU and sensors. Use Value: 40-V absolute maximum input rating and thermal shutdown allow reliable operation in harsh appliance environments with minimal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-12 | Fixed 12-V output; identical pinout, package, and electrical specs except output voltage and associated internal feedback ratio. | Used where 12-V logic or legacy interface standards require exact voltage - not interchangeable without circuit redesign. | Select only if system requires 12-V rail; no change to layout or thermal design needed. |
| LM2576HV-15 | Same 15-V output but supports 60-V max input (vs. 40 V); higher thermal resistance (RθJA = 32.4°C/W vs. 32.4°C/W for KC package - same value but HV version may differ in practice per datasheet table). | Required for 48-V telecom or industrial systems where input can exceed 40 V during transients or no-load conditions. | Choose when input voltage may reach 48–60 V; otherwise LM2576T-15 offers cost and thermal advantage at ≤40 V. |
Compared with LM2576T-12, the LM2576T-15 provides higher output voltage for applications needing 15-V analog rails or legacy peripherals, while LM2576HV-15 extends safe operating input range to 60 V - both retain identical footprint and protection features but require voltage-specific design validation.
Availability
LM2576T-15 is available at Aetrix Electronics and suitable for industrial motor drives, test equipment power supplies, merchant server auxiliary rails, and home appliance control boards requiring stable component supply and long-lifecycle support.
Supply support for LM2576T-15 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in rugged, high-reliability power conversion solutions.
The LM2576 series was designed as a robust, easy-to-use replacement for linear regulators in medium-power industrial and commercial applications - prioritizing thermal efficiency, fault protection, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2576T-15?
The LM2576T-15 has a maximum recommended input voltage of 40 V under normal operating conditions. Absolute maximum rating is 45 V, but sustained operation above 40 V risks reliability degradation. For systems with input transients exceeding 40 V - such as 48-V telecom or automotive applications - the LM2576HV-15 variant (60-V rated) should be selected instead of LM2576T-15.
Does LM2576T-15 require an external feedback resistor network?
No, LM2576T-15 does not require external feedback resistors. As a fixed-output variant, its internal feedback divider is factory-trimmed to deliver 15 V ±4%. Pin 4 (FEEDBACK) is internally connected to the output and must remain unconnected in the LM2576T-15 - unlike the adjustable LM2576ADJ version which requires external R1/R2.
How is thermal performance managed in LM2576T-15?
LM2576T-15 uses a TO-220-5 (KC) package with an integral GND-connected tab that serves as the primary thermal path. For full 3-A operation, the tab must be soldered to a heatsink or ≥1 in² copper pour on the PCB. Thermal resistance is specified as RθJA = 32.4°C/W with proper heatsinking; insufficient thermal management causes early thermal shutdown at ~150°C junction temperature.
Can LM2576T-15 be synchronized to an external clock?
No, LM2576T-15 cannot be synchronized to an external clock. It uses an internal fixed-frequency 52-kHz oscillator with ±10% tolerance. There is no SYNC or CLKIN pin, and frequency adjustment is not supported. For synchronizable alternatives, consider newer TI parts like LMR51430 or LM76003, which offer programmable switching frequencies and external sync capability - but these are not pin-compatible replacements for LM2576T-15.
What protection features are built into LM2576T-15?
LM2576T-15 integrates cycle-by-cycle current limiting (5.8-A typical), thermal shutdown (activates at ~150°C junction temperature), and TTL-compatible ON/OFF control with 50-μA standby current. It also supports external undervoltage lockout via the ON/OFF pin. Notably absent are overvoltage protection and output short-circuit hiccup mode - output collapse under short is handled by current limiting and thermal shutdown.
LM2576T-15 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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):
- 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-15 FAQ
1.How can I place an order for LM2576T-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-15 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-15 reliable?
The price and inventory of LM2576T-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-15 is usually 5 days.
3.What payment methods are accepted for LM2576T-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-15?
LM2576T-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-15 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-15?
For technical support, including LM2576T-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-15 requirements.
6.How does Aetrix verify that LM2576T-15 is sourced from the original manufacturer or authorized distributors?
All LM2576T-15 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-15 meets industry standards.
7.What is the process for return or replacement of LM2576T-15?
All LM2576T-15 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-15, 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-15 part is unused and in its original packaging.
Return procedure for LM2576T-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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