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onsemi LM2576TV-012G
- Part No.:
- LM2576TV-012G
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576TV-012G.pdf
- Description:
- IC REG BUCK 12V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,761
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Product details
Overview
LM2576TV-012G from onsemi is a monolithic 3.0 A, 12 V fixed-output step-down (buck) switching regulator in TO-220 package. It operates from 7.0 V to 40 V input, delivers ±4% output voltage accuracy over line/load/temperature, features 52 kHz fixed-frequency internal oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF control - used in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2576TV-012G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 12 V fixed output with ±4% tolerance, 52 kHz switching frequency, thermal shutdown protection, and TO-220-5 package with heatsink-connected ground pin.
Technical Context
The LM2576TV-012G integrates a 1.0 A NPN switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and current-limit comparator in a single monolithic IC. Its fixed 12 V output eliminates external feedback resistors, simplifying design while maintaining regulation across −40 °C to +125 °C junction temperature.
It implements voltage-mode PWM control with fixed frequency operation and automatic frequency reduction (to ~18 kHz) during overload or short-circuit conditions to limit average power dissipation. The internal switch saturation voltage is 1.5 V (typ) at 3.0 A, enabling efficient buck conversion without external MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line, load, and temperature range - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Max Output Current | 3.0 A continuous - supports medium-power applications such as FPGA core supplies or motor driver bias rails. |
| Input Voltage Range | 7.0 V to 40 V - accommodates wide-input industrial or automotive battery-derived supplies (e.g., 12 V nominal systems with transients). |
| Switching Frequency | 52 kHz (±10% over temp) - enables use of low-cost, standard inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 88% typical at 15 VIN, 3.0 A load - significantly higher than linear regulators, minimizing heat generation and eliminating need for large heatsinks. |
| Protection Features | Cycle-by-cycle current limiting, thermal shutdown, and 80 µA standby current in shutdown - provides robust fault handling without external supervision circuitry. |
| Package | TO-220-5 (Case 314B), heatsink surface connected to Pin 3 (GND) - enables direct mounting to chassis or heatsink for thermal management. |
Pinout & Package
LM2576TV-012G uses the TO-220-5 package (Case 314B), with the metal tab (heatsink surface) internally connected to Pin 3 (GND). This configuration requires mechanical grounding of the tab for optimal thermal performance and electrical safety.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires low-ESR 100 µF input capacitor placed close to pin to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 12 V; PCB copper area must be minimized to reduce coupling into sensitive circuits. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors and feedback; metal tab is electrically tied to this pin for thermal conduction. |
| 4 - Feedback | Regulation sense input | Internally connected to 12 V divider; unused in fixed-output version - must be left open or grounded per datasheet guidance. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator, reducing quiescent current to 80 µA; open or logic-low enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% output accuracy. |
| 52 kHz fixed-frequency oscillator | Enables predictable EMI spectrum and compatibility with low-cost, off-the-shelf 100 µH inductors optimized for this frequency. |
| TTL shutdown capability | Allows system-level power sequencing via microcontroller GPIO; standby current drops to 80 µA, supporting low-power sleep modes. |
| Integrated thermal shutdown | Automatically disables output when junction temperature exceeds 150 °C, preventing damage during overload or poor heatsinking. |
| Cycle-by-cycle current limiting | Clamps peak switch current to ≥4.2 A (typ), protecting both IC and external diode/inductor during startup or short-circuit events. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
|
Use Scenario: Provides primary 12 V rail for PLC I/O modules powered from 24 V DC industrial bus with voltage transients up to 40 V. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 12 V at up to 3.0 A, replacing linear regulators to avoid excessive heat buildup. Use Value: 88% efficiency at full load reduces thermal load by >70% vs. linear solution, enabling compact enclosure design without forced air cooling. |
Use Scenario: Generates clean 12 V intermediate rail for downstream LDOs powering MCU cores and peripherals in edge gateway devices. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down 24 V input to 12 V before final LDO regulation, improving overall system efficiency. Use Value: Fixed 12 V output eliminates resistor network errors and drift, ensuring stable LDO input voltage under varying load and temperature. |
| On-Card DC-DC Conversion | Battery Charger Power Stage |
|
Use Scenario: Mounted directly on PCB of test equipment to generate local 12 V supply for analog front-end circuitry, minimizing noise coupling from shared system rails. IC Role / Device Role / Timing Role: Local point-of-load buck regulator with integrated switch and protection, reducing component count and board space. Use Value: TO-220 package allows direct heatsink attachment; 52 kHz frequency avoids interference with sensitive analog measurement bandwidths. |
Use Scenario: Powers constant-current stage of 12 V sealed lead-acid battery charger fed from rectified AC or solar input (up to 40 V). IC Role / Device Role / Timing Role: Main step-down regulator controlling charging voltage; ON/OFF pin enables charge termination signaling from microcontroller. Use Value: Thermal shutdown and current limiting protect against battery faults (e.g., shorted cell), enhancing charger reliability and safety compliance. |
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 | Same electrical specs and TO-220-5 package; differs only in marking convention and RoHS status (LM2576TV-012G is Pb-free per MSL 1). | No functional difference; suitable for identical designs where Pb-free compliance is required. | Select LM2576TV-012G when JEDEC MSL 1 moisture sensitivity and Pb-free finish are mandatory for automated assembly. |
| LM2596T-12 | Higher 63 kHz switching frequency, lower 1.2 V dropout, but rated for 3.0 A only at lower ambient temperatures; different pinout (no dedicated ON/OFF pin). | Lacks TTL shutdown and has different thermal characteristics - unsuitable for designs requiring precise enable control or operation above 85 °C ambient. | Choose LM2576TV-012G over LM2596T-12 when reliable ON/OFF control, proven thermal performance up to 125 °C junction, or legacy design compatibility is critical. |
Compared with LM2576T-12, LM2576TV-012G offers identical regulation and protection but guarantees Pb-free compliance and MSL 1 handling; versus LM2596T-12, it trades higher frequency for superior thermal robustness and integrated enable functionality essential for industrial power sequencing.
Availability
LM2576TV-012G is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, on-card DC-DC conversion, and battery charger power stages requiring stable component supply and long-term manufacturability.
Supply support for LM2576TV-012G 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 (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was designed specifically for cost-sensitive, high-reliability industrial and embedded applications requiring simple, robust, fixed-output buck conversion with minimal external components and built-in fault protection.
FAQ
What is the maximum input voltage rating for the LM2576TV-012G?
The LM2576TV-012G has an absolute maximum input voltage rating of 45 V, but its recommended operating input range is 7.0 V to 40 V per the datasheet. Operation above 40 V risks exceeding internal transistor breakdown limits and invalidates guaranteed performance specifications. For sustained reliability, keep Vin ≤ 40 V in normal operation.
Does the LM2576TV-012G require an external feedback resistor network?
No, the LM2576TV-012G is a fixed-output variant with internal resistor divider set for 12 V regulation. Pin 4 (Feedback) is internally connected and must be left unconnected or grounded per datasheet guidance - no external resistors are needed or permitted for output voltage setting.
How does the ON/OFF pin function on the LM2576TV-012G?
The ON/OFF pin (Pin 5) enables TTL-compatible shutdown: applying ≥2.2 V disables the regulator and reduces quiescent current to 80 µA (typ); applying ≤1.2 V or leaving the pin open enables normal operation. This feature supports system-level power sequencing and low-power sleep states without external logic level shifters.
What thermal considerations apply to the LM2576TV-012G in TO-220 package?
The LM2576TV-012G TO-220 package (Case 314B) has RθJC = 5.0 °C/W and RθJA = 65 °C/W. To maintain TJ ≤ 125 °C at 3.0 A load, a heatsink with ≤15 °C/W thermal resistance is recommended. The metal tab is electrically connected to Pin 3 (GND), so mechanical mounting must ensure electrical isolation unless chassis ground is used.
Can the LM2576TV-012G be used in a negative-output (buck-boost) configuration?
Yes - the LM2576TV-012G can be configured as a positive-to-negative converter using the standard buck-boost topology shown in the datasheet (Figure 1, page 2). In this mode, Pin 2 (Output) becomes the negative output node, and the inductor/diode/capacitor connections are rearranged accordingly, preserving all protection features including current limiting and thermal shutdown.
LM2576TV-012G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- 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):
- 12V
- 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
LM2576TV-012G FAQ
1.How can I place an order for LM2576TV-012G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576TV-012G 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 LM2576TV-012G reliable?
The price and inventory of LM2576TV-012G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576TV-012G is usually 5 days.
3.What payment methods are accepted for LM2576TV-012G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576TV-012G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576TV-012G?
LM2576TV-012G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576TV-012G 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 LM2576TV-012G?
For technical support, including LM2576TV-012G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576TV-012G requirements.
6.How does Aetrix verify that LM2576TV-012G is sourced from the original manufacturer or authorized distributors?
All LM2576TV-012G 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 LM2576TV-012G meets industry standards.
7.What is the process for return or replacement of LM2576TV-012G?
All LM2576TV-012G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576TV-012G, 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 LM2576TV-012G part is unused and in its original packaging.
Return procedure for LM2576TV-012G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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