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Texas Instruments LM2576S-5.0
- Part No.:
- LM2576S-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576S-5.0.pdf
- Description:
- IC REG BUCK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,027
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Product details
Overview
LM2576S-5.0 from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-263 (DDPAK) package, delivering fixed 5.0 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 mid-power industrial and embedded power supplies where thermal efficiency and minimal external components are critical.
For engineers reviewing the LM2576S-5.0 datasheet, LM2576S-5.0 pinout, LM2576S-5.0 application, or LM2576S-5.0 equivalent, key selection factors include its 40-V max input rating, 3-A continuous output capability, cycle-by-cycle current limiting, thermal shutdown protection, and compatibility with standard off-the-shelf inductors - all validated for stable operation across −40°C to +125°C junction temperature.
Technical Context
The LM2576S-5.0 integrates a 3-A NPN switch, fixed 52-kHz oscillator, error amplifier, bandgap reference (1.23 V), and thermal/current protection circuitry into a single IC. Its non-synchronous buck architecture uses an external catch diode and requires only four external components: input capacitor, output capacitor, inductor, and feedback network (shorted for fixed 5-V version).
It operates in active mode when ON/OFF pin voltage is below 1.2 V (typical), entering low-power shutdown at ≤50 μA standby current when pin voltage exceeds 1.4 V. Output regulation is maintained via internal voltage-mode control with ±4% output accuracy and ±10% oscillator frequency tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - ensures stable logic supply without external resistor divider. |
| Max Input Voltage | 40 V - supports wide-input industrial rails including 24-V and 36-V systems with margin. |
| Output Current | 3 A continuous - enables direct powering of microcontrollers, sensors, and peripheral ICs without parallel devices. |
| Oscillator Frequency | 52 kHz (±10%) - balances EMI performance and inductor size; avoids AM radio band while enabling use of low-cost, high-current toroids. |
| Efficiency | 77% at VIN = 12 V, IOUT = 3 A - reduces heat sink requirements vs. linear regulators; no heatsink needed at moderate loads. |
| Standby Current | 50 μA typical - enables low-power system sleep modes without compromising fast wake-up response. |
| Saturation Voltage | 1.8 V max at 3 A - defines minimum dropout: VIN(MIN) = VOUT + VSAT ≈ 6.8 V under full load. |
| Current Limit | 4.2–6.9 A - provides robust short-circuit and overload protection with cycle-by-cycle peak limiting. |
Pinout & Package
LM2576S-5.0 is supplied in the KTT (DDPAK/TO-263-5) surface-mount package with 10.16 mm × 8.42 mm body size and thermally enhanced exposed tab connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Connects to high-side NPN collector; must be decoupled with low-ESR capacitor placed <5 mm from pin to minimize switching noise and voltage spikes. |
| 2 - OUTPUT | Switching node | Emitter of internal NPN; connects directly to inductor and cathode of external Schottky diode - high dv/dt node requiring tight layout and ground plane clearance. |
| 3 - GROUND | Power and signal reference | Common return for input/output capacitors and feedback path; shortest possible trace to VIN and OUTPUT bypass caps required for stability. |
| 4 - FEEDBACK | Voltage sense input | Internally tied to 5-V output; left unconnected (open) for fixed-output versions - no external resistors needed. |
| 5 - ON/OFF | Enable control | TTL-compatible digital input: <1.2 V = ON, >1.4 V = OFF; 50-μA standby current allows direct MCU GPIO drive without level shifting. |
| TAB | Thermal & electrical ground | Exposed copper pad soldered to PCB thermal plane; primary heat dissipation path - minimum 1.6 in² copper area recommended for full 3-A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output | Eliminates external feedback resistors - reduces BOM count, layout complexity, and calibration drift risk. |
| Integrated thermal shutdown | Automatically disables switching above 150°C junction temperature - prevents catastrophic failure during sustained overload or poor heatsinking. |
| Cycle-by-cycle current limit | Clamps peak inductor current to ~5.8 A (typ) - protects internal switch and external diode during output shorts or startup surges. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI filtering and consistent inductor sizing - avoids variable-frequency jitter and simplifies compliance testing. |
| TTL shutdown interface | Supports direct connection to 3.3-V or 5-V logic outputs - no pull-up/pull-down resistors needed for enable/disable sequencing. |
| Standard inductor compatibility | Works with off-the-shelf 15–100 µH shielded power inductors rated ≥3.5 A - accelerates design validation and procurement. |
Applications
| Industrial Motor Drives | Embedded Control Power |
|---|---|
Use Scenario: Powering gate drivers, position sensors, and MCU peripherals in 24-V DC motor controllers. IC Role / Device Role / Timing Role: Primary 5-V rail generator converting unregulated 24-V bus to clean, regulated logic supply. Use Value: Delivers 3-A peak current during motor commutation transients while maintaining ±4% regulation - eliminates brownouts in real-time control loops. | Use Scenario: Supplying FPGA I/O banks, ADC references, and communication interfaces in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Fixed-output buck converter providing isolated 5-V domain with low ripple and fast transient response. Use Value: 77% efficiency at 3 A reduces board-level heat density by >60% vs. linear regulators - enables fanless enclosure designs. |
| Test Equipment Power | Appliance Control Boards |
Use Scenario: Generating stable 5-V bias for precision op-amps, DACs, and reference buffers in bench multimeters and signal generators. IC Role / Device Role / Timing Role: Low-noise, well-regulated DC source with minimal load-dependent drift. Use Value: ±4% output tolerance and <100-mV peak-to-peak ripple ensure measurement accuracy within 0.1% FS across operating temperature. | Use Scenario: Powering microcontroller, display backlight, and relay drivers in smart home appliances (dishwashers, HVAC controls). IC Role / Device Role / Timing Role: Main system power IC handling both steady-state and pulsed loads (e.g., solenoid actuation). Use Value: Built-in thermal shutdown and current limiting prevent field failures during inrush or jammed-motor conditions - improves product reliability certification pass rate. |
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 | TO-220-5 package (KC); higher RθJA (32.4°C/W vs. 42.6°C/W); identical electrical specs. | Requires mechanical heatsink for >1.5 A continuous loads; less suitable for compact SMT-only layouts. | Select LM2576T-5.0 only when through-hole assembly or legacy footprint compatibility is mandatory. |
| LM2596S-5.0 | 150-kHz switching frequency; 3-A rating; improved efficiency (≥85% at 12 V→5 V); smaller external components. | Better suited for space-constrained designs needing lower EMI and faster transient response - but not pin-compatible. | Choose LM2596S-5.0 for new designs prioritizing size and efficiency; LM2576S-5.0 remains optimal for cost-sensitive, thermally robust legacy upgrades. |
Compared with LM2576T-5.0, LM2576S-5.0 offers superior thermal performance in SMT form factor, while LM2596S-5.0 delivers higher efficiency and frequency at the cost of redesign effort - making LM2576S-5.0 the preferred choice for drop-in replacement in existing TO-263-based industrial power stages.
Availability
LM2576S-5.0 is available at Aetrix Electronics and suitable for industrial motor drives, embedded control power, test equipment, and appliance control boards requiring stable component supply and long-term manufacturability.
Supply support for LM2576S-5.0 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 reliable, high-volume power conversion ICs.
The LM2576 series was designed as a rugged, easy-to-use SIMPLE SWITCHER® solution for cost-sensitive industrial and consumer power supplies - emphasizing fault resilience, minimal external parts, and broad input voltage tolerance.
FAQ
What is the maximum input voltage rating for LM2576S-5.0?
The LM2576S-5.0 has a maximum input voltage rating of 40 V, with absolute maximum stress limit at 45 V. Operation beyond 40 V risks permanent damage and voids warranty. For 60-V input applications, the LM2576HV-5.0 variant must be used instead - it shares identical pinout and functionality but features enhanced high-voltage process technology.
Does LM2576S-5.0 require external feedback resistors?
No, LM2576S-5.0 does not require external feedback resistors. As a fixed-output version, its internal feedback divider is factory-trimmed to 5.0 V, and the FEEDBACK pin (Pin 4) is internally connected to the output. Leaving this pin unconnected or floating is correct - adding external resistors would disrupt regulation and cause output voltage error.
Can LM2576S-5.0 be synchronized to an external clock?
No, LM2576S-5.0 cannot be synchronized to an external clock. It uses an internal fixed-frequency 52-kHz oscillator with no sync input pin or frequency adjustment capability. For synchronizable buck regulators, consider TI's LM5115 or newer LMR series - LM2576S-5.0 is optimized for simplicity and cost, not multi-rail timing coordination.
What thermal management is required for full 3-A operation of LM2576S-5.0?
For continuous 3-A output at ambient temperatures up to 70°C, LM2576S-5.0 requires ≥1.6 in² of 2-oz copper on the PCB connected to its exposed thermal tab. With this layout, junction temperature stays below 125°C. Without adequate copper area, thermal shutdown will activate under sustained load - verify θJA = 42.6°C/W in your actual board stack-up using TI's thermal simulation guidelines.
Is LM2576S-5.0 RoHS compliant and lead-free?
Yes, LM2576S-5.0 is RoHS compliant and lead-free per TI's current manufacturing standards. The KTT (TO-263) package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3). Full compliance documentation, including substance declarations and test reports, is available in TI's official product folder for LM2576S-5.0.
LM2576S-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2576S-5.0 FAQ
1.How can I place an order for LM2576S-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576S-5.0 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 LM2576S-5.0 reliable?
The price and inventory of LM2576S-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576S-5.0 is usually 5 days.
3.What payment methods are accepted for LM2576S-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576S-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576S-5.0?
LM2576S-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576S-5.0 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 LM2576S-5.0?
For technical support, including LM2576S-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576S-5.0 requirements.
6.How does Aetrix verify that LM2576S-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2576S-5.0 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 LM2576S-5.0 meets industry standards.
7.What is the process for return or replacement of LM2576S-5.0?
All LM2576S-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576S-5.0, 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 LM2576S-5.0 part is unused and in its original packaging.
Return procedure for LM2576S-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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