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onsemi LM2576T-012G
- Part No.:
- LM2576T-012G
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-012G.pdf
- Description:
- IC REG BUCK 12V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
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Product details
Overview
LM2576T-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, and features internal 52 kHz oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF control - used in industrial power supplies and embedded DC-DC conversion.
For engineers reviewing the LM2576T-012G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 12 V fixed output with ±4% tolerance, TO-220 thermal performance (RJC = 5.0 °C/W), 52 kHz fixed-frequency operation, and integrated protection including thermal shutdown and current limit.
Technical Context
The LM2576T-012G implements a voltage-mode controlled buck converter with an internal NPN switch, 1.235 V bandgap reference, and error amplifier. Its 52 kHz fixed-frequency oscillator drives the power stage with up to 98% duty cycle, enabling stable regulation across wide input ranges (7–40 V) while maintaining 12 V ±4% output under 0.5–3.0 A load and −40 °C to +125 °C junction temperature.
Protection architecture includes cycle-by-cycle peak current limiting (typ. 5.8 A at 25 °C), thermal shutdown activation at TJ ≥ 150 °C, and low-power standby mode (80 µA typical quiescent current) via TTL-level ON/OFF pin. The device requires only four external components: input capacitor, output capacitor, catch diode (e.g., MBR360), and inductor (e.g., 100 µH).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for microcontrollers and analog circuitry without external feedback resistors. |
| Max Output Current | Guaranteed 3.0 A continuous - supports high-current loads like motor drivers or FPGA core supplies without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V DC - accommodates unregulated 12 V/24 V industrial bus inputs and battery-backed systems with wide voltage swing. |
| Switching Frequency | 52 kHz fixed (±10% over temp) - enables use of low-cost, standard inductors and simplifies EMI filtering vs. higher-frequency alternatives. |
| Efficiency | 88% typical at 15 VIN, 3.0 A load - reduces thermal load versus linear regulators, often eliminating need for heatsink in moderate ambient conditions. |
| Thermal Resistance | RJC = 5.0 °C/W (TO-220 case) - allows direct heatsink mounting to Pin 3 (GND) for reliable 3 A operation at TA ≤ 70 °C. |
| Standby Current | 80 µA typical at 25 °C - enables low-power system sleep modes via logic-controlled ON/OFF pin without auxiliary LDOs. |
Pinout & Package
LM2576T-012G uses TO-220 package (Case 314D), with heatsink surface electrically connected to Pin 3 (GND). Mounting tab must be isolated from chassis ground unless GND reference is shared.
| 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 adjacent to minimize switching transients. |
| 2: Output | Emiter of internal NPN switch | Delivers regulated 12 V; saturation voltage ≤1.8 V at 3 A - impacts dropout and efficiency; PCB copper area must be minimized to reduce noise coupling. |
| 3: GND | Circuit ground / heatsink connection | Common return for all signals and thermal path; tab connects directly to internal die substrate - critical for thermal management and noise control. |
| 4: Feedback | Regulation sense node | Internally tied to 12 V output divider; unused in fixed versions - must remain unconnected and not routed near noise sources. |
| 5: ON/OFF | Logic-enable control input | TTL-compatible: <1.4 V = ON, >2.2 V = OFF; draws ≤30 µA when high - enables system-level power sequencing and standby control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated protection | Thermal shutdown + cycle-by-cycle current limiting - eliminates need for external fault-handling circuitry in overload or short-circuit conditions. |
| Low-component design | Only 4 external parts required (Cin, Cout, D1, L1) - accelerates prototyping and reduces BOM cost vs. controller-based solutions. |
| Standard inductor compatibility | Optimized for off-the-shelf 100 µH pulse inductors (e.g., Pulse PE-92108) - avoids custom magnetics and simplifies sourcing. |
| Wide operating temperature | −40 °C to +125 °C junction range - qualified for industrial and automotive under-hood applications without derating. |
| Pb-free packaging | RoHS-compliant TO-220 (Case 314D) - meets global environmental compliance requirements without leaded solder concerns. |
Applications
| Industrial Power Supply | Embedded System DC-DC Conversion |
|---|---|
Use Scenario: Converting 24 V factory bus to stable 12 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, regulated 12 V rail with high efficiency and thermal resilience. Use Value: Eliminates linear regulator heat dissipation; maintains regulation across 15–30 V input variation common in industrial environments. | Use Scenario: Providing 12 V bias to analog front-ends and communication transceivers in network edge devices. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying isolated 12 V domain with minimal external components. Use Value: Reduces board space and component count vs. discrete switcher designs while meeting ±4% output accuracy for precision analog circuits. |
| On-Card Switching Regulator | Battery Charger Pre-Regulator |
Use Scenario: Local 12 V generation on dense PCBs where space limits use of external DC-DC modules. IC Role / Device Role / Timing Role: Integrated buck IC handling full 3 A load directly on target board, minimizing interconnect losses. Use Value: Achieves >88% efficiency at full load with TO-220 thermal performance - avoids thermal throttling in confined enclosures. | Use Scenario: Stepping down 36 V battery pack voltage to 12 V intermediate rail before final linear regulation for charging circuitry. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing power loss prior to low-noise LDO stages. Use Value: Lowers total system dissipation by >60% vs. linear-only solution, extending battery runtime and reducing charger thermal stress. |
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-12 | Higher input voltage rating (60 V max vs. 40 V); same 12 V fixed output, TO-220 package, and 3 A rating. | Required for 48 V nominal systems or transient-heavy automotive inputs exceeding 40 V. | Select LM2576HVT-12 when input may exceed 40 V; otherwise LM2576T-012G offers identical performance at lower cost. |
| LM2596-12 | Higher switching frequency (150 kHz), smaller inductor size, but lower max output current (3 A typical, not guaranteed), different pinout. | Suitable for space-constrained designs where 150 kHz allows smaller magnetics, but not drop-in replacement due to pin mismatch and reduced current guarantee. | Choose LM2596-12 only if board layout permits rework and 3 A is not strictly guaranteed; LM2576T-012G remains preferred for robust 3 A industrial loads. |
Compared with LM2576HVT-12, LM2576T-012G trades 20 V input headroom for cost and availability; compared with LM2596-12, it provides guaranteed 3 A output and proven thermal reliability in TO-220, at the expense of higher inductor size - making it optimal for industrial 12 V rails where stability and current assurance outweigh miniaturization.
Availability
LM2576T-012G is available at Aetrix Electronics and suitable for industrial power supplies, embedded system DC-DC conversion, and on-card switching regulators requiring stable component supply and long-term manufacturability.
Supply support for LM2576T-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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2576 series was designed as a monolithic, easy-to-use buck regulator family targeting cost-sensitive, high-reliability industrial and embedded power conversion - emphasizing minimal external components, integrated protection, and wide-input operation.
FAQ
What is the maximum input voltage rating for LM2576T-012G?
The LM2576T-012G has a maximum input voltage rating of 40 V DC, with absolute maximum supply voltage specified at 45 V. Operation above 40 V risks exceeding safe operating area limits and may trigger thermal shutdown or cause permanent damage. For 48 V systems, consider the LM2576HVT-12 variant instead. The LM2576T-012G is optimized for 7–40 V industrial and battery-derived inputs.
Does LM2576T-012G require external feedback resistors?
No, LM2576T-012G does not require external feedback resistors. As a fixed 12 V output version, its internal resistor divider sets the output voltage - Pin 4 (Feedback) is internally connected and must remain unconnected in circuit. External resistors are only needed for the adjustable LM2576-ADJ variant. Using LM2576T-012G simplifies layout and improves accuracy by eliminating resistor tolerance and thermal drift effects.
What thermal management is required for LM2576T-012G at full 3 A load?
At 3 A continuous load with 24 V input, LM2576T-012G dissipates ~3.6 W. With RJC = 5.0 °C/W and RCA ≈ 30 °C/W (typical TO-220 on 1"² 2 oz copper), junction temperature rises ~105 °C above ambient. A heatsink (e.g., 10 °C/W) is recommended for ambient >50 °C. Mounting the tab (Pin 3) to a grounded metal chassis or dedicated heatsink is mandatory - LM2576T-012G cannot sustain full load without thermal relief.
Can LM2576T-012G be used in battery-powered applications with deep discharge?
Yes, LM2576T-012G supports input down to 7.0 V, making it suitable for 12 V lead-acid or LiFePO4 battery systems that discharge to ~9–10 V under load. Its 52 kHz fixed frequency ensures stable regulation even at low input voltages, and 80 µA standby current enables ultra-low-power shutdown modes. However, below 7 V the device ceases regulation - verify minimum battery voltage under worst-case load before selecting LM2576T-012G.
Which diode is recommended for use with LM2576T-012G?
The datasheet recommends the MBR360 Schottky diode for LM2576T-012G: 3 A average current rating, 60 V reverse voltage, low forward voltage (~0.55 V), and fast recovery. This matches the LM2576T-012G's 3 A output and 40 V max input. Alternative options include SR306 or SB560. Avoid standard PN diodes (e.g., 1N4007) due to excessive reverse recovery losses and efficiency degradation in the LM2576T-012G application.
LM2576T-012G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- 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
LM2576T-012G FAQ
1.How can I place an order for LM2576T-012G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-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 LM2576T-012G reliable?
The price and inventory of LM2576T-012G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-012G is usually 5 days.
3.What payment methods are accepted for LM2576T-012G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-012G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-012G?
LM2576T-012G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-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 LM2576T-012G?
For technical support, including LM2576T-012G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-012G requirements.
6.How does Aetrix verify that LM2576T-012G is sourced from the original manufacturer or authorized distributors?
All LM2576T-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 LM2576T-012G meets industry standards.
7.What is the process for return or replacement of LM2576T-012G?
All LM2576T-012G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-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 LM2576T-012G part is unused and in its original packaging.
Return procedure for LM2576T-012G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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