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onsemi LM2576D2T-012
- Part No.:
- LM2576D2T-012
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2T-012.pdf
- Description:
- IC REG BUCK 12V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,491
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Product details
Overview
LM2576D2T-012 from onsemi is a monolithic 3.0 A, 12 V fixed-output step-down (buck) switching regulator in D2PAK package, featuring 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, thermal shutdown, and cycle-by-cycle current limiting. It delivers high efficiency (88% at 15 VIN, 3.0 A) for industrial power supplies requiring stable 12 V rails from 15–40 V inputs.
For engineers reviewing the LM2576D2T-012 datasheet, pinout, applications, or equivalent options, key selection factors include guaranteed 3.0 A output current, fixed 12 V output with no external feedback resistors, TO-220-compatible D2PAK thermal performance (RJC = 5.0 °C/W), and TTL-compatible ON/OFF control with 80 µA standby current.
Technical Context
The LM2576D2T-012 integrates a 1.0 A NPN switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and thermal/current protection circuitry. Its fixed 12 V output eliminates external feedback components, simplifying design while maintaining ±4% regulation across −40 °C to +125 °C junction temperature.
It operates in continuous conduction mode with 94–98% max duty cycle, saturation voltage ≤2.0 V at full load, and built-in 18 kHz foldback frequency during overload-reducing average dissipation by lowering minimum duty cycle to ~2% under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over input 15–40 V, load 0.5–3.0 A, and temperature −40 to +125 °C - enables direct replacement of linear regulators without resistor network tuning. |
| Max Output Current | 3.0 A DC - supports single-rail 12 V systems powering microcontrollers, sensors, and peripheral logic without external current boosting. |
| Oscillator Frequency | 52 kHz (±10% over 0–125 °C) - balances EMI suppression and inductor size; compatible with standard off-the-shelf 100 µH pulse inductors (e.g., Pulse PE-92108). |
| Efficiency | 88% at VIN = 15 V, IOUT = 3.0 A - reduces thermal load vs. linear regulators; often eliminates need for heatsink in ambient ≤50 °C. |
| Standby Current | 80 µA typical at VON/OFF = 5 V - enables low-power system sleep modes with minimal battery drain in portable or always-on applications. |
| Thermal Protection | Internal thermal shutdown with automatic recovery - prevents permanent damage during sustained overload or inadequate heatsinking. |
| Input Voltage Range | 7.0 V to 40 V - accommodates wide-input industrial, automotive, and telecom power buses including unregulated 24 V nominal supplies. |
Pinout & Package
D2PAK (TO-263) package, Case 936A, with heatsink surface electrically connected to Pin 3 (GND). Standard 5-pin layout optimized for high-current thermal and EMI performance.
| 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; PCB copper area must be minimized to reduce coupling into sensitive analog circuits. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, catch diode, and inductor; serves as thermal path to heatsink surface. |
| 4 - Feedback | Regulation sense node | Internally tied to 12 V divider; unused in fixed-output version - must be left unconnected or grounded per datasheet guidance. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.4 V) disables regulator; logic-low (<0.8 V) or open enables operation - supports microcontroller-based power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while ensuring ±4% accuracy across temperature and load. |
| Integrated protection | Cycle-by-cycle current limiting (peak 3.5–7.5 A) plus thermal shutdown - enables robust operation in harsh environments without external fault management circuitry. |
| Low-quiescent operation | 5.0–9.0 mA operating current and 80 µA standby current - extends battery life in intermittent-use systems such as remote sensors or alarm panels. |
| Standard inductor compatibility | Optimized for widely available 100 µH pulse inductors (e.g., Pulse PE-92108, Renco RL2444) - accelerates design validation and simplifies sourcing. |
| High-efficiency buck topology | 88% efficiency at full load reduces heat generation by >70% versus equivalent linear regulators - lowers system cooling requirements and improves reliability. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Provides clean 12 V rail for microcontroller, CAN transceiver, and I/O drivers in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V input to isolated 12 V domain; handles transient loads up to 3.0 A during solenoid actuation. Use Value: High efficiency minimizes thermal stress in sealed enclosures; fixed 12 V output ensures deterministic startup timing without calibration. |
Use Scenario: Powers MCU, LIN transceivers, and LED drivers in vehicle door modules fed from 12 V battery with cold-crank dips to 6 V. IC Role / Device Role / Timing Role: Buck converter maintaining regulated 12 V during cranking; ON/OFF pin synchronizes with vehicle ignition state. Use Value: Wide 7–40 V input range tolerates battery fluctuations; thermal shutdown prevents latch-up during shorted output faults. |
| Point-of-Load Telecom Converter | Test Equipment Auxiliary Supply |
|
Use Scenario: Generates 12 V for FPGA configuration, ADC biasing, and clock buffers in 48 V-powered telecom line cards. IC Role / Device Role / Timing Role: Secondary regulator stepping down intermediate 24 V rail; operates at fixed 52 kHz to avoid interference with data clocks. Use Value: Low EMI due to fixed-frequency operation; D2PAK package allows direct mounting to chassis for enhanced thermal management. |
Use Scenario: Supplies 12 V to analog front-end circuitry and relay drivers in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Isolated DC-DC stage decoupling noisy digital sections from precision analog paths. Use Value: Minimal external components (4 total) reduce layout complexity; ±4% output tolerance meets test-grade accuracy requirements. |
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 | TO-220 package (Case 314B/D), identical electrical specs, higher RJA (65 °C/W vs. 70 °C/W), heatsink surface tied to Pin 3. | Better suited for low-volume prototyping with clip-on heatsinks; less suitable for automated SMT assembly. | Select LM2576T-12 only when manual heatsink attachment is preferred and board space permits larger footprint. |
| MP1584EN-LF-Z | 3 A, adjustable 0.8–28 V output, 1.5 MHz switching, smaller SO-8EP package, but requires external feedback resistors and has lower PSRR. | Enables multi-voltage designs but increases component count and layout sensitivity; lacks integrated thermal foldback. | Choose MP1584EN-LF-Z only when higher frequency (reduced inductor size) and adjustable output outweigh fixed-voltage simplicity and robustness. |
Compared with LM2576T-12, the LM2576D2T-012 offers superior thermal resistance to ambient (70 vs. 65 °C/W) in SMT form factor, while MP1584EN-LF-Z trades proven ruggedness for compactness and flexibility-making LM2576D2T-012 optimal for cost-sensitive, high-reliability 12 V fixed-rail applications.
Availability
LM2576D2T-012 is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, and telecom point-of-load converters requiring stable component supply with long lifecycle support.
Supply support for LM2576D2T-012 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 supplier focused on energy-efficient power management, analog, and sensor technologies for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was designed as a drop-in replacement for linear regulators in medium-power DC-DC conversion, emphasizing simplicity, ruggedness, and thermal resilience in harsh environments.
FAQ
What is the maximum input voltage rating for the LM2576D2T-012?
The LM2576D2T-012 has an absolute maximum input voltage of 45 V, with recommended operating range of 7.0 V to 40 V. Exceeding 45 V risks permanent damage; operation above 40 V may degrade long-term reliability even if within instantaneous limits. The LM2576D2T-012 is commonly used with 24 V industrial buses and 12 V automotive systems with cold-crank tolerance.
Does the LM2576D2T-012 require external feedback resistors to set its output voltage?
No, the LM2576D2T-012 is a fixed 12 V output variant - its feedback divider is fully internal, so no external resistors are needed. Pin 4 (Feedback) must remain unconnected or grounded per datasheet guidance. This distinguishes it from the adjustable LM2576-ADJ version and simplifies layout and BOM for dedicated 12 V applications.
Can the LM2576D2T-012 be used in parallel for higher current capability?
No, the LM2576D2T-012 is not designed for parallel operation. Its voltage-mode control architecture lacks current-sharing capability, and mismatched internal references or propagation delays would cause unequal current distribution and potential thermal runaway. For >3.0 A, use a higher-current regulator or redesign with multiphase topology.
What is the thermal resistance from junction to case (RJC) for the LM2576D2T-012?
The LM2576D2T-012 has a junction-to-case thermal resistance (RJC) of 5.0 °C/W, measured from die to the exposed heatsink surface (Pin 3/GND pad). This value assumes proper soldering to a ≥1 in² copper pour and is critical for calculating maximum allowable power dissipation in thermally constrained layouts.
Is the LM2576D2T-012 RoHS-compliant and lead-free?
Yes, the LM2576D2T-012 is offered in Pb-Free packages compliant with RoHS Directive 2011/65/EU. The device carries Moisture Sensitivity Level (MSL) 1, meaning it can be stored indefinitely at ≤30 °C/85% RH without baking prior to reflow. Full compliance documentation is available in onsemi's official product change notices.
LM2576D2T-012 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
LM2576D2T-012 FAQ
1.How can I place an order for LM2576D2T-012 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2T-012 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 LM2576D2T-012 reliable?
The price and inventory of LM2576D2T-012 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2T-012 is usually 5 days.
3.What payment methods are accepted for LM2576D2T-012?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2T-012 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2T-012?
LM2576D2T-012 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2T-012 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 LM2576D2T-012?
For technical support, including LM2576D2T-012 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2T-012 requirements.
6.How does Aetrix verify that LM2576D2T-012 is sourced from the original manufacturer or authorized distributors?
All LM2576D2T-012 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 LM2576D2T-012 meets industry standards.
7.What is the process for return or replacement of LM2576D2T-012?
All LM2576D2T-012 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2T-012, 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 LM2576D2T-012 part is unused and in its original packaging.
Return procedure for LM2576D2T-012:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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