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Texas Instruments LM2576T-5.0/LB03
- Part No.:
- LM2576T-5.0/LB03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576T-5.0/LB03.pdf
- Description:
- IC REG BUCK 5V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,131
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Product details
Overview
LM2576T-5.0/LB03 from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-220-5 (KC) package, delivering fixed 5-V output with ±4% regulation over line and load, 40-V max input, and 52-kHz fixed-frequency operation. It replaces linear regulators in industrial power supplies, motor drives, and test equipment where thermal efficiency and minimal external parts are critical.
For engineers reviewing the LM2576T-5.0/LB03 datasheet, LM2576T-5.0/LB03 pinout, LM2576T-5.0/LB03 application, or LM2576T-5.0/LB03 equivalent, key selection factors include its 3-A continuous output capability, TTL-compatible ON/OFF control, cycle-by-cycle current limiting, thermal shutdown protection, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576T-5.0/LB03 integrates a high-side NPN switch, fixed-frequency oscillator, error amplifier, and feedback comparator in a single die. Its architecture uses voltage-mode control with internal 1.23-V reference and direct feedback sensing at the output capacitor for fixed-voltage variants.
It operates in continuous conduction mode under full load and transitions to discontinuous mode at light loads without instability. Protection features include thermal shutdown, cycle-by-cycle current limiting (ICL = 4.2–6.9 A), and undervoltage lockout via the ON/OFF pin - all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V ±4% over full operating temperature (−40°C to +125°C) and load (0.5–3 A), enabling stable logic supply without trimming. |
| Max Input Voltage | 40 V - supports wide-input industrial rails (e.g., 24-V or 36-V systems with transient margin). |
| Output Current | 3 A continuous - sufficient for powering microcontrollers, sensors, and peripheral ICs without external pass devices. |
| Oscillator Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Standby Current | 50 μA typical at ON/OFF = HIGH - allows low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Resistance | RθJA = 32.4°C/W (TO-220) - permits 3-A operation up to +85°C ambient with minimal heatsink area. |
| Efficiency | 77% at 12-VIN/5-VOUT/3-A - reduces heat generation by >50% vs. linear regulators, eliminating need for large heatsinks. |
Pinout & Package
LM2576T-5.0/LB03 is housed in a KC (TO-220-5) package with integrated heatsink tab electrically connected to GROUND. The tab must be thermally coupled to a PCB copper pour or external heatsink for reliable 3-A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input power supply connection | High-current path to internal switch collector; requires short, low-inductance routing to input capacitor to minimize switching noise. |
| 2 - OUTPUT | Switching node | Drives external inductor and catch diode; high dv/dt node requiring tight layout and ground shielding to reduce EMI. |
| 3 - GROUND | Power and signal reference | Common return for input/output capacitors and feedback network; must be low-impedance and directly tied to VIN and OUTPUT ground paths. |
| 4 - FEEDBACK | Regulation sense input | Internally connected to output for fixed 5-V version; left unconnected on LM2576T-5.0/LB03 (no external divider needed). |
| 5 - ON/OFF | Enable/disable control | TTL-compatible logic input: <1.2 V = active, >1.4 V = shutdown; 50-μA standby current enables simple microcontroller or switch control. |
| TAB | Thermal and electrical ground | Internally bonded to GROUND pin; must be soldered to ≥1 in² copper area or heatsink for thermal performance compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output | Eliminates external resistor divider, reducing BOM count and improving long-term output stability vs. adjustable variants. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI spectrum and simplifies filter design using standard 100–220-μH shielded inductors. |
| Cycle-by-cycle current limiting | Prevents switch failure during short-circuit or overload by clamping peak inductor current to 4.2–6.9 A without external sensing. |
| Integrated thermal shutdown | Automatically disables switching when junction temperature exceeds ~150°C, protecting device and system during sustained overload or poor heatsinking. |
| TTL shutdown interface | Allows seamless integration with microcontrollers, FPGAs, or power sequencers using standard logic-level signals without level-shifting. |
Applications
| Industrial Motor Drives | Test & Measurement Equipment |
|---|---|
Use Scenario: Powering gate drivers, op-amps, and MCU peripherals in servo amplifier modules with 24-V bus input. IC Role / Device Role / Timing Role: Primary 5-V local power rail generator replacing linear regulators to reduce board-level heat and improve efficiency. Use Value: Delivers 3-A at 77% efficiency from 12-V input, cutting thermal load by >60% and enabling compact enclosure designs. | Use Scenario: Supplying analog front-end circuitry and digital logic in portable multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Isolated 5-V bias rail with low ripple and fast transient response for precision ADC references and clock buffers. Use Value: Achieves <100-mVpp output ripple with standard 220-μH inductor and 220-μF output capacitor, meeting EN 61000-4-3 immunity requirements. |
| Merchant Network PSU | Home Appliances |
Use Scenario: Secondary-side 5-V standby rail in AC/DC PSUs for routers and switches, supporting always-on management functions. IC Role / Device Role / Timing Role: Low-quiescent-current (50-μA) regulated supply activated only during wake events via ON/OFF pin control. Use Value: Meets Energy Star Level VI standby power limits (<0.5 W) while maintaining fast wake-up response (<100 μs). | Use Scenario: Main 5-V logic supply in washing machine control boards powered from rectified 120/230-VAC via bulk capacitor. IC Role / Device Role / Timing Role: Robust buck converter handling wide input transients (up to 40 V) and load steps from solenoid actuation. Use Value: Withstands 40-V input surges and delivers 3-A peak current for motor driver ICs, eliminating brownout resets during spin cycles. |
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-5.0 | Same silicon, identical electrical specs; differs only in marking and packaging - LB03 denotes TI's tape-and-reel variant with enhanced moisture sensitivity level (MSL 3). | No functional difference; suitable for same PCB layouts and thermal designs. | Select LM2576T-5.0/LB03 for automated SMT assembly with J-STD-020-compliant reflow profile support. |
| LM2596T-5.0 | Higher 150-kHz switching frequency, lower 3-A max output, improved light-load efficiency, but requires different inductor value (33–47 μH vs. 100–220 μH). | Better suited for space-constrained designs; not drop-in due to changed LC values and layout-sensitive high-frequency operation. | Choose LM2596T-5.0 only when board area is critical and redesign of magnetics/filtering is acceptable. |
Compared with LM2576T-5.0/LB03, the LM2576T-5.0 offers identical performance in a different packaging format, while LM2596T-5.0 trades thermal robustness and layout simplicity for higher frequency and smaller passive size - making LM2576T-5.0/LB03 optimal for industrial reliability and ease of qualification.
Availability
LM2576T-5.0/LB03 is available at Aetrix Electronics and suitable for industrial motor drives, merchant network PSUs, and home appliance control systems requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for LM2576T-5.0/LB03 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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2576 series was designed specifically for cost-sensitive, thermally demanding industrial and consumer applications where simplicity, ruggedness, and minimal external components are essential - establishing the SIMPLE SWITCHER® benchmark for non-synchronous buck regulators.
FAQ
What is the maximum input voltage rating for LM2576T-5.0/LB03?
The LM2576T-5.0/LB03 has an absolute maximum input voltage of 45 V and a recommended maximum operating input voltage of 40 V. Exceeding 40 V continuously may degrade long-term reliability, though brief transients up to 45 V are tolerated per Absolute Maximum Ratings. This rating ensures compatibility with 24-V and 36-V industrial bus systems with safety margin.
Does LM2576T-5.0/LB03 require an external feedback resistor network?
No, LM2576T-5.0/LB03 does not require an external feedback resistor network. As a fixed 5-V output variant, its internal feedback divider is factory-trimmed and connected internally; the FEEDBACK pin (Pin 4) is unused and left unconnected in standard operation - simplifying design and improving output accuracy stability.
How does the ON/OFF pin function on LM2576T-5.0/LB03?
The ON/OFF pin (Pin 5) on LM2576T-5.0/LB03 provides TTL-compatible enable control: logic LOW (<1.2 V) enables regulation, while logic HIGH (>1.4 V) places the device in low-power shutdown with 50-μA typical quiescent current. It is not open-drain and must not be left floating - tie to GND for always-on operation or drive with MCU GPIO.
What thermal performance can be expected from LM2576T-5.0/LB03 in TO-220 package?
In its KC (TO-220-5) package, LM2576T-5.0/LB03 has RθJA = 32.4°C/W. With 3-A load at 12-VIN/5-VOUT, power dissipation is ~2.1 W; this yields ~68°C junction rise above ambient, allowing full-rated operation up to +85°C ambient with no heatsink - or up to +105°C ambient with a modest 1-in² copper pour.
Is LM2576T-5.0/LB03 pin-compatible with other LM2576 fixed-output variants?
Yes, LM2576T-5.0/LB03 is fully pin-compatible with all LM2576 fixed-output versions (e.g., LM2576T-3.3, LM2576T-12) and the adjustable LM2576T-ADJ in the same KC (TO-220-5) package. Pinout, footprint, thermal pad connection, and control logic are identical - enabling one PCB layout to support multiple output voltages via BOM change only.
LM2576T-5.0/LB03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- 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):
- 5V
- 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-5.0/LB03 FAQ
1.How can I place an order for LM2576T-5.0/LB03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-5.0/LB03 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-5.0/LB03 reliable?
The price and inventory of LM2576T-5.0/LB03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-5.0/LB03 is usually 5 days.
3.What payment methods are accepted for LM2576T-5.0/LB03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-5.0/LB03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-5.0/LB03?
LM2576T-5.0/LB03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-5.0/LB03 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-5.0/LB03?
For technical support, including LM2576T-5.0/LB03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-5.0/LB03 requirements.
6.How does Aetrix verify that LM2576T-5.0/LB03 is sourced from the original manufacturer or authorized distributors?
All LM2576T-5.0/LB03 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-5.0/LB03 meets industry standards.
7.What is the process for return or replacement of LM2576T-5.0/LB03?
All LM2576T-5.0/LB03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-5.0/LB03, 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-5.0/LB03 part is unused and in its original packaging.
Return procedure for LM2576T-5.0/LB03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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