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onsemi LM2576T-005
- Part No.:
- LM2576T-005
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-005.pdf
- Description:
- IC REG BUCK 5V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,175
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Product details
Overview
LM2576T-005 from onsemi is a monolithic 3.0 A, 5.0 V fixed-output step-down (buck) switching regulator in TO-220 package. It delivers ±4% output voltage accuracy over line/load/temperature, operates from 7.0–40 V input, features 52 kHz internal oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF control - enabling compact, high-efficiency power supplies for industrial and embedded systems.
For engineers reviewing the LM2576T-005 datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to the LM2576T-005 TO-220 variant.
Technical Context
The LM2576T-005 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 package. Its fixed 5.0 V output is internally trimmed and requires no external feedback resistors - simplifying layout and reducing BOM count.
It employs voltage-mode control with cycle-by-cycle current limiting and thermal shutdown for fault protection. Standby quiescent current is 80 µA typical when ON/OFF pin is pulled high, and the internal 3.1 V regulator powers bias circuitry independently of output load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±4% over −40 °C to +125 °C, 0.5–3.0 A load, 8–40 V input - ensures stable logic-level rail without trimming or calibration. |
| Max Output Current | 3.0 A continuous - supports mid-power applications like microcontroller boards or sensor modules without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - accommodates wide-input industrial supplies (e.g., 12/24 V nominal buses) and battery-backed systems. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0–125 °C) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Efficiency | 77% typical at 12 VIN, 3.0 A, 5 VOUT - significantly lowers thermal dissipation vs. linear regulators, often eliminating heatsink requirements. |
| Standby Quiescent Current | 80 µA typical at 25 °C when ON/OFF = 5 V - enables ultra-low-power shutdown mode for battery-powered systems. |
| Saturation Voltage | 1.5 V typical at 3.0 A, 25 °C - defines minimum dropout (VIN ≥ VOUT + 1.5 V + diode drop), critical for low-input-margin designs. |
Pinout & Package
LM2576T-005 uses the TO-220-5 (Case 314D) package with heatsink surface electrically connected to Pin 3 (GND). The tab must be thermally mounted to a heatsink or copper pour for reliable 3.0 A operation at elevated ambient temperatures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR capacitor to suppress switching transients and supply peak current. |
| 2 - Output | Emiter of internal NPN switch | Drives inductor; saturation voltage ≤1.8 V at 3.0 A limits conduction loss; PCB trace area must be minimized to reduce noise coupling. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, catch diode, and feedback network; single-point grounding recommended for stability. |
| 4 - Feedback | Regulation sense node | Internally connected to 5.0 V divider; left unconnected for fixed-output version - no external resistors required. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator and drops input current to ~80 µA; open or logic-low (<1.0 V) enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors, reducing component count, layout sensitivity, and temperature drift in cost-sensitive designs. |
| Integrated thermal shutdown | Automatically disables switching if junction temperature exceeds ~150 °C, preventing damage during overload or poor heatsinking. |
| Cycle-by-cycle current limiting | Clamps peak switch current to ~5.8 A (typical), protecting against short-circuit loads without requiring external current-sense circuitry. |
| 52 kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with standard off-the-shelf inductors optimized for this frequency (e.g., Pulse PE-92108). |
| TTL shutdown capability | Supports microcontroller-controlled power sequencing with <100 µA standby draw - ideal for portable and energy-aware systems. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
|
Use Scenario: Providing regulated 5 V rail for PLC I/O modules powered from 24 V DC field bus. IC Role / Device Role / Timing Role: Primary buck converter delivering 3.0 A continuous output with line/load regulation better than ±4% across operating temperature. Use Value: Replaces linear regulators to avoid >15 W dissipation at full load, enabling convection-cooled enclosure design. |
Use Scenario: Powering ARM Cortex-M7 MCU, Ethernet PHY, and DDR memory on a compact industrial gateway board. IC Role / Device Role / Timing Role: Main 5 V system rail generator with integrated current limiting and thermal protection for robust field operation. Use Value: Reduces bill-of-materials by eliminating external feedback network and simplifies layout with only four external components required. |
| Test Equipment Front-End | DC Motor Control Logic Supply |
|
Use Scenario: Generating clean 5 V supply for analog front-end circuitry and ADC reference in handheld multimeters. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-noise LDOs; 52 kHz switching frequency allows effective LC filtering before sensitive analog stages. Use Value: Achieves 77% efficiency at 3 A, minimizing self-heating that could drift precision analog measurements. |
Use Scenario: Powering H-bridge gate drivers and microcontroller in 12–24 V battery-operated motor controllers. IC Role / Device Role / Timing Role: Dedicated logic supply isolated from noisy motor drive paths; ON/OFF pin synchronized with motor enable signals. Use Value: Enables zero-current shutdown state (80 µA) during motor idle periods, extending battery runtime in portable tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVT-5.0 | Wider input range (4–60 V); same pinout, package, and 5 V output; higher max junction temperature (150 °C). | Required for automotive cold-crank (4.5 V) or industrial 48 V bus applications where standard LM2576T-005 cannot operate. | Select when input voltage may dip below 7 V or exceed 40 V - otherwise LM2576T-005 offers lower cost and identical performance in 7–40 V systems. |
| LM2596S-5.0 | Higher switching frequency (150 kHz); smaller external components; 3 A rating but lower thermal performance in TO-220; no ON/OFF pin. | Preferred for space-constrained designs needing compact inductors/capacitors; unsuitable where logic-controlled shutdown is required. | Choose for size-sensitive consumer electronics; retain LM2576T-005 when proven thermal reliability, TTL shutdown, or legacy design continuity is prioritized. |
Compared with LM2576HVT-5.0 and LM2596S-5.0, the LM2576T-005 provides optimal balance of ruggedness, feature set (ON/OFF control), and thermal margin in standard 7–40 V industrial power rails - making it the preferred choice where long-term reliability and design simplicity outweigh ultra-compact size or extended input range needs.
Availability
LM2576T-005 is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, test equipment front-ends, and DC motor control logic supplies requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM2576T-005 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2576 series was designed specifically for cost-sensitive, medium-power DC-DC conversion in industrial and embedded systems - emphasizing minimal external components, robust thermal/current protection, and ease of implementation without complex compensation networks.
FAQ
What is the maximum input voltage rating for the LM2576T-005?
The LM2576T-005 has an absolute maximum input voltage of 45 V, but its guaranteed operating range is 7.0 V to 40 V per the datasheet. Exceeding 40 V risks violating the specified electrical characteristics and may trigger internal protection circuits. For designs requiring >40 V input, the LM2576HVT-5.0 (60 V max) is the validated alternative. Always observe derating guidelines for long-term reliability.
Does the LM2576T-005 require external feedback resistors to set the output voltage?
No, the LM2576T-005 does not require external feedback resistors. It is the fixed 5.0 V output variant - the feedback divider is fully internal and factory-trimmed. Pin 4 (Feedback) is unused and must remain unconnected. This eliminates resistor tolerance errors, temperature drift, and layout sensitivity associated with adjustable versions, directly improving output accuracy and design simplicity.
Can the LM2576T-005 drive a 3.0 A load continuously without a heatsink?
The LM2576T-005 can deliver 3.0 A continuously without a heatsink only under favorable thermal conditions: ambient temperature ≤25 °C, adequate PCB copper area (≥4 cm² 2-oz copper connected to Pin 3), and low duty-cycle operation. At full load and 40 V input, thermal calculations show junction temperature exceeding 150 °C without heatsinking. For reliable 3.0 A operation across −40 °C to +85 °C ambient, a TO-220 heatsink (e.g., 10 °C/W) is strongly recommended.
What is the purpose of the ON/OFF pin (Pin 5) on the LM2576T-005?
The ON/OFF pin (Pin 5) provides TTL-compatible enable/disable control for the LM2576T-005. Applying ≥2.2 V disables the regulator, reducing total input current to ~80 µA typical. Pulling it low (<1.0 V) or leaving it open enables normal operation. This feature enables precise power sequencing, battery-saving sleep modes, and system-level fault isolation - all without external MOSFETs or level shifters.
Which catch diode is recommended for use with the LM2576T-005 in a 3.0 A application?
The datasheet recommends the MBR360 Schottky diode for the LM2576T-005 at 3.0 A. It provides 60 V reverse voltage rating (≥1.25×40 V max input), 3.0 A average current handling, and low forward voltage (~0.75 V) to minimize conduction loss. Alternative qualified parts include SR306, SK34, or MBRD360 - all selected for fast recovery, low Qrr, and compatibility with the LM2576T-005's 52 kHz switching frequency and peak current profile.
LM2576T-005 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):
- 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-005 FAQ
1.How can I place an order for LM2576T-005 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-005 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-005 reliable?
The price and inventory of LM2576T-005 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-005 is usually 5 days.
3.What payment methods are accepted for LM2576T-005?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-005 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-005?
LM2576T-005 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-005 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-005?
For technical support, including LM2576T-005 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-005 requirements.
6.How does Aetrix verify that LM2576T-005 is sourced from the original manufacturer or authorized distributors?
All LM2576T-005 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-005 meets industry standards.
7.What is the process for return or replacement of LM2576T-005?
All LM2576T-005 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-005, 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-005 part is unused and in its original packaging.
Return procedure for LM2576T-005:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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