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Texas Instruments LM2576T-15/LF03
- Part No.:
- LM2576T-15/LF03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576T-15/LF03.pdf
- Description:
- IC REG BUCK 15V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LM2576T-15/LF03 from Texas Instruments is a monolithic 3-A non-synchronous step-down (buck) DC-DC voltage regulator in TO-220-5 (KC) package, delivering fixed 15-V output with ±4% tolerance over line and load, 40-V max input, and 52-kHz fixed-frequency operation. It serves as a high-efficiency replacement for linear regulators in industrial power supplies, motor drives, and test equipment.
For engineers reviewing the LM2576T-15/LF03 datasheet, LM2576T-15/LF03 pinout, LM2576T-15/LF03 application, or LM2576T-15/LF03 equivalent, key selection factors include its 3-A continuous output capability, TTL-compatible ON/OFF control with 50-μA standby current, cycle-by-cycle current limiting, thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576T-15/LF03 integrates a 3-A NPN switch, 52-kHz oscillator, error amplifier, and feedback comparator in a single monolithic IC. Its fixed 15-V output eliminates external resistor divider requirements, and the internal bandgap reference (1.23 V) enables precise regulation without trimming.
It operates in continuous conduction mode under full load and transitions to discontinuous mode at light loads. Protection features include cycle-by-cycle current limiting (ICL = 4.2–6.9 A), thermal shutdown, and undervoltage lockout via the ON/OFF pin - all implemented without external components beyond the required inductor, diode, and input/output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over full operating temperature (−40°C to +125°C) and load (0.5–3 A) |
| Input Voltage Range | 4 V to 40 V - supports wide-input industrial rails; minimum startup voltage ~7 V |
| Max Output Current | 3 A DC continuous - requires heatsink above ~1.5 A at ambient >50°C in TO-220 package |
| Oscillator Frequency | 52 kHz ±10% - fixed frequency simplifies EMI filtering and inductor selection |
| Efficiency | 88% at VIN = 18 V, IOUT = 3 A - reduces thermal load vs. linear regulators |
| Standby Current | 50 μA typical at ON/OFF = HIGH - enables low-power system-level shutdown |
| Saturation Voltage | 1.4–2.0 V at IOUT = 3 A - defines dropout behavior and conduction loss |
| Feedback Reference | 1.23 V internal - used only in ADJ version; not applicable to fixed 15-V variant |
Pinout & Package
LM2576T-15/LF03 uses the KC (TO-220-5) package with 10.16 mm × 8.51 mm body size and integral heat-tab 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 NPN collector; requires short-path 100-μF+ input capacitor to minimize switching noise |
| 2 - OUTPUT | Switching node | Emitter of internal NPN; connects directly to inductor and catch diode cathode - high dv/dt node requiring tight layout |
| 3 - GROUND | Power ground | Common return for input cap, feedback, and ON/OFF; must share low-inductance path with VIN and OUTPUT |
| 4 - FEEDBACK | Regulation sense | Internally tied to 15-V output - no external divider needed; floating or misconnected causes regulation failure |
| 5 - ON/OFF | Enable control | TTL-compatible: <1.2 V = active, >1.4 V = shutdown; 50-μA standby draw when HIGH |
| TAB | Thermal & electrical ground | Internally connected to GND pin; mandatory heatsink attachment point for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-output architecture | Eliminates external feedback resistors - reduces BOM count, layout area, and calibration risk for 15-V systems |
| Integrated cycle-by-cycle current limit | Prevents switch destruction during overload or short-circuit without external sensing - limits peak inductor current to ~5.8 A typical |
| Thermal shutdown protection | Automatically disables switching above ~150°C junction temperature - prevents permanent damage during sustained overload |
| Low-standby-current enable | 50-μA shutdown current enables battery-backed or energy-sensitive applications to retain system-level power control |
| Standard inductor compatibility | Optimized for common 150-μH shielded power inductors - avoids custom magnetics and accelerates design validation |
Applications
| Motor Drive Power Supply | Industrial Test Equipment PSU |
|---|---|
Use Scenario: Provides regulated 15-V bias for gate drivers and logic in 24-V DC motor controllers. IC Role / Device Role / Timing Role: Primary buck regulator supplying isolated logic and gate-drive rails from unregulated bus. Use Value: Delivers stable 15-V output across 12–36-V input transients while maintaining 3-A headroom for peak gate charge currents. | Use Scenario: Powers analog front-end circuitry and microcontroller peripherals in portable benchtop instruments. IC Role / Device Role / Timing Role: Main DC-DC converter generating clean 15-V rail from rechargeable Li-ion or AC adapter input. Use Value: 88% efficiency minimizes self-heating in sealed enclosures; fixed output ensures consistent ADC reference and op-amp biasing. |
| Appliance Control Board | Merchant Server PSU Auxiliary Rail |
Use Scenario: Supplies 15-V power to solenoid drivers, display backlight inverters, and sensor interfaces in smart home appliances. IC Role / Device Role / Timing Role: High-reliability offline-to-15V converter replacing linear regulators on main control PCB. Use Value: Reduces heatsink size by >70% vs. 7815 linear regulator; ON/OFF pin enables synchronized power sequencing with MCU. | Use Scenario: Generates 15-V auxiliary rail for fan controllers, LED indicators, and BMC management circuits in 1U server PSUs. IC Role / Device Role / Timing Role: Secondary buck stage deriving isolated 15-V from primary 12-V or 5-V intermediate bus. Use Value: Withstands 40-V input surges common in server backplanes; 52-kHz frequency avoids audible noise in dense chassis layouts. |
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-15 | Same die, identical electrical specs; differs only in RoHS compliance marking (LF03 = lead-free, halogen-free) | No functional difference - suitable for same designs; LF03 required for EU/China RoHS-compliant production | Select LM2576T-15/LF03 for new designs targeting environmental compliance; LM2576T-15 remains viable for legacy non-RoHS builds |
| LM2576HV-15 | Higher 60-V max input (vs. 40 V); otherwise identical pinout, output, and thermal specs | Required where input may exceed 40 V (e.g., automotive cold-crank, industrial 48-V systems) | Choose LM2576HV-15 only if input voltage exceeds 40 V; not drop-in compatible due to different absolute maximum ratings |
Compared with LM2576T-15/LF03, the LM2576T-15 offers identical performance with non-RoHS packaging, while LM2576HV-15 extends input range to 60 V but requires revalidation of input capacitor voltage rating and surge protection - neither is pin-compatible replacement without design review.
Availability
LM2576T-15/LF03 is available at Aetrix Electronics and suitable for industrial motor drives, appliance control boards, test equipment power supplies, and merchant server auxiliary rails requiring stable component supply and long-term manufacturability.
Supply support for LM2576T-15/LF03 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 high-reliability power conversion solutions.
The LM2576 series was designed as a robust, easy-to-use SIMPLE SWITCHER® solution for cost-sensitive industrial and consumer applications needing 3-A buck regulation without complex external circuitry.
FAQ
What is the maximum input voltage rating for LM2576T-15/LF03?
The LM2576T-15/LF03 has an absolute maximum input voltage of 45 V and a recommended maximum operating input voltage of 40 V. Exceeding 40 V risks premature device failure, especially at elevated temperatures. The HV variant (LM2576HV-15) supports up to 60 V input and must be selected instead for higher-voltage applications.
Does LM2576T-15/LF03 require an external feedback resistor network?
No. The LM2576T-15/LF03 is a fixed-output variant with internal feedback set to 15 V. Pin 4 (FEEDBACK) is internally connected to the output and must not be externally loaded or disconnected. External resistors are only required for the adjustable (ADJ) version of the LM2576 family.
What thermal management is required for LM2576T-15/LF03 at 3-A load?
At 3-A continuous load with 18-V input and 15-V output, LM2576T-15/LF03 dissipates ~9 W. In the TO-220-5 (KC) package, this requires a heatsink with ≤10°C/W thermal resistance or ≥10 cm² copper pour on 2-oz PCB to maintain junction temperature below 125°C. Thermal derating curves in the datasheet must be consulted for specific ambient conditions.
Can LM2576T-15/LF03 be synchronized to an external clock?
No. The LM2576T-15/LF03 uses an internal 52-kHz fixed-frequency oscillator with no external synchronization capability. Frequency variation is ±10% over temperature and supply. For synchronizable buck regulators, consider newer alternatives like LM76003 or LMR51430.
Is LM2576T-15/LF03 RoHS compliant and lead-free?
Yes. The "/LF03" suffix explicitly denotes lead-free and halogen-free construction per JEDEC J-STD-609A Class 3. LM2576T-15/LF03 meets EU RoHS Directive 2011/65/EU and China RoHS GB/T 26572-2011 requirements, with Pb content <1000 ppm and no restricted brominated flame retardants.
LM2576T-15/LF03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- 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):
- 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/LF03 FAQ
1.How can I place an order for LM2576T-15/LF03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-15/LF03 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/LF03 reliable?
The price and inventory of LM2576T-15/LF03 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/LF03 is usually 5 days.
3.What payment methods are accepted for LM2576T-15/LF03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-15/LF03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-15/LF03?
LM2576T-15/LF03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-15/LF03 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/LF03?
For technical support, including LM2576T-15/LF03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-15/LF03 requirements.
6.How does Aetrix verify that LM2576T-15/LF03 is sourced from the original manufacturer or authorized distributors?
All LM2576T-15/LF03 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/LF03 meets industry standards.
7.What is the process for return or replacement of LM2576T-15/LF03?
All LM2576T-15/LF03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-15/LF03, 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/LF03 part is unused and in its original packaging.
Return procedure for LM2576T-15/LF03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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