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onsemi LM2576D2TR4-012
- Part No.:
- LM2576D2TR4-012
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2TR4-012.pdf
- Description:
- IC REG BUCK 12V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,517
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Product details
Overview
LM2576D2TR4-012 from onsemi is a monolithic 3.0 A, 12 V fixed-output step-down (buck) switching regulator in D2PAK 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 DC-DC conversion with minimal external components.
For engineers reviewing the LM2576D2TR4-012 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 12 V fixed output, D2PAK thermal performance (RJC = 5.0 °C/W), 80 µA standby quiescent current, and compatibility with standard off-the-shelf inductors (e.g., Pulse PE-92108).
Technical Context
The LM2576D2TR4-012 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 resistors, simplifying design versus adjustable versions.
It uses voltage-mode PWM control with fixed frequency operation and automatic frequency foldback (to ~18 kHz) during overload or short-circuit conditions to reduce average power dissipation. The internal switch saturation voltage is 1.5 V (typ) at 3.0 A, defining conduction loss and minimum dropout behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over −40 °C to +125 °C, 0.5–3.0 A load, 15–40 V input - ensures stable rail for microcontrollers, sensors, and analog circuitry without trimming. |
| Output Current | Guaranteed 3.0 A continuous - supports mid-power applications like motor drivers or multi-rail systems without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - accommodates wide-input industrial, automotive, and battery-derived supplies (e.g., 12 V nominal bus with transients). |
| Switching Frequency | 52 kHz (±10% over temp) - enables use of low-cost, high-saturation-current inductors (e.g., 100 µH Pulse PE-92108) and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 88% typical at 15 VIN, 3.0 A load - significantly reduces heat generation versus linear regulators, often eliminating heatsink requirements in ambient ≤50 °C. |
| Standby Current | 80 µA typical at 25 °C when ON/OFF pin ≥2.2 V - enables ultra-low-power system sleep modes in battery-backed or energy-conscious designs. |
| Thermal Resistance | Junction-to-case RJC = 5.0 °C/W - allows direct heatsink mounting via exposed tab (Pin 3), enabling >2 W dissipation with modest heatsinking. |
Pinout & Package
D2PAK (TO-263) package, case 936A, with heatsink surface electrically connected to Pin 3 (GND). Exposed metal tab serves as thermal path and functional ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR electrolytic bypass capacitor to suppress switching transients. |
| 2 - Output | Emiter of internal NPN switch | Delivers regulated 12 V; saturation voltage ≤2.0 V at full load defines minimum input-output differential and conduction loss. |
| 3 - GND | Circuit ground / heatsink terminal | Common return for input/output capacitors, diode cathode, and inductor; must be connected to large copper area or heatsink for thermal management. |
| 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 | Logic-controlled enable/disable | TTL-compatible: <1.0 V (min) = "on", ≥2.4 V (min) = "off"; draws ≤30 µA when active, enabling low-power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external resistor network, reducing BOM count, layout sensitivity, and temperature drift vs. adjustable variants. |
| 52 kHz fixed-frequency oscillator | Enables predictable EMI spectrum and simplifies filter design using standard, low-cost inductors optimized for this frequency. |
| Cycle-by-cycle current limiting | Protects against shorted outputs and inrush by limiting peak switch current to 4.2–7.5 A, preventing device latch-up or damage. |
| Thermal shutdown | Activates at TJ ≥150 °C and holds until junction cools by ≥15 °C - prevents permanent failure under sustained overload or poor heatsinking. |
| Moisture Sensitivity Level 1 | Zero floor-life limitation; no bake requirement before reflow - supports standard SMT assembly without special handling. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24 V vehicle battery to stable 12 V for MCU, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, ripple-controlled 12 V rail with fault protection. Use Value: 88% efficiency at 3.0 A reduces thermal load in sealed enclosures; ON/OFF pin enables ignition-synchronized power gating. |
Use Scenario: Powering door lock actuators, window lift motors, and interior lighting controllers from 12 V battery. IC Role / Device Role / Timing Role: High-current DC-DC stage delivering robust 12 V output tolerant of load dumps and cold-crank conditions. Use Value: Wide 7–40 V input range survives 40 V load dump transients; thermal shutdown prevents failure during motor stall events. |
| Programmable Logic Controller (PLC) I/O Module | Test & Measurement Equipment |
|
Use Scenario: Generating clean 12 V for analog signal conditioning, isolation amplifiers, and digital I/O buffers in modular PLC backplanes. IC Role / Device Role / Timing Role: Local point-of-load regulator minimizing noise coupling into sensitive analog sections. Use Value: Fixed 12 V output eliminates resistor tolerance errors; 52 kHz switching avoids interference with common 50/60 Hz measurement bands. |
Use Scenario: Supplying 12 V to precision DACs, ADC references, and op-amp rails in portable bench instruments. IC Role / Device Role / Timing Role: Low-noise, high-stability power source with tight output regulation (±4%) across temperature and load. Use Value: ±4% output tolerance ensures reference accuracy; low 80 µA standby current extends battery life in handheld units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-12 | TO-220 package (Case 314B/D), higher RJA = 65 °C/W, same electrical specs. | Requires larger heatsink for 3.0 A continuous operation; less suitable for high-density PCBs. | Select when mechanical mounting constraints favor TO-220 or legacy board compatibility is required. |
| LM2596-12 | Higher 150 kHz switching frequency, lower 3.0 A max output, improved efficiency (~92%), smaller inductor size. | Better suited for space-constrained designs but requires tighter layout for EMI control due to faster edges. | Choose for compact layouts where 150 kHz operation and reduced inductor volume outweigh need for identical pinout or legacy support. |
Compared with LM2576D2TR4-012, LM2576T-12 offers identical regulation but inferior thermal performance in TO-220, while LM2596-12 trades proven ruggedness for higher frequency and density - making LM2576D2TR4-012 optimal for thermally demanding, cost-sensitive industrial applications requiring field-proven reliability.
Availability
LM2576D2TR4-012 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) modules requiring stable component supply, long-term lifecycle support, and consistent thermal performance in D2PAK packaging.
Supply support for LM2576D2TR4-012 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 sensing technologies for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was designed as a rugged, easy-to-use buck regulator family targeting cost-sensitive, high-reliability applications where simplicity, thermal robustness, and wide input range are critical - especially in industrial controls and legacy automotive systems.
FAQ
What is the maximum input voltage rating for the LM2576D2TR4-012?
The LM2576D2TR4-012 has an absolute maximum input voltage rating of 45 V, with recommended operating input range of 7.0 V to 40 V. Operation above 40 V risks exceeding safe operating area limits under transient conditions, and the device includes internal protection but is not rated for sustained 45 V operation. Always refer to the "Maximum Ratings" table in the official onsemi datasheet for LM2576D2TR4-012.
Does the LM2576D2TR4-012 require external feedback resistors?
No, the LM2576D2TR4-012 is a fixed 12 V output variant - its feedback divider is fully internal. Pin 4 (Feedback) is not connected externally and should remain unconnected or grounded per onsemi's application guidance. This eliminates resistor tolerance, temperature drift, and layout sensitivity associated with adjustable versions like LM2576-ADJ.
What is the thermal resistance from junction to case (RJC) for the LM2576D2TR4-012?
The LM2576D2TR4-012 in D2PAK (Case 936A) has a specified junction-to-case thermal resistance (RJC) of 5.0 °C/W. This value assumes proper soldering of the exposed tab (electrically connected to Pin 3/GND) to a heatsink or large copper plane. Effective thermal design relies on maintaining low thermal interface resistance between the tab and heatsink surface.
Can the LM2576D2TR4-012 be used in a negative-output (buck-boost) configuration?
Yes - the LM2576D2TR4-012 can be configured as a positive-to-negative converter (inverting buck-boost topology), as explicitly listed in the "Applications" section of the onsemi datasheet. This requires reconfiguring the inductor, diode, and capacitor placement per Figure 1 in the datasheet, with output referenced to VIN rather than GND. Output voltage magnitude remains 12 V, but polarity is inverted.
What is the typical efficiency of the LM2576D2TR4-012 at full 3.0 A load?
The LM2576D2TR4-012 achieves 88% typical efficiency at 15 V input and 3.0 A output load, as measured per the test conditions in the onsemi Electrical Characteristics table. Efficiency varies with input voltage and load - e.g., it drops to ~75% at 12 VIN/3.0 A for the 12 V version - due to fixed switching losses and higher relative conduction loss at lower VIN.
LM2576D2TR4-012 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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
LM2576D2TR4-012 FAQ
1.How can I place an order for LM2576D2TR4-012 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2TR4-012 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 LM2576D2TR4-012 reliable?
The price and inventory of LM2576D2TR4-012 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2TR4-012 is usually 5 days.
3.What payment methods are accepted for LM2576D2TR4-012?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2TR4-012 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2TR4-012?
LM2576D2TR4-012 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2TR4-012 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 LM2576D2TR4-012?
For technical support, including LM2576D2TR4-012 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2TR4-012 requirements.
6.How does Aetrix verify that LM2576D2TR4-012 is sourced from the original manufacturer or authorized distributors?
All LM2576D2TR4-012 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 LM2576D2TR4-012 meets industry standards.
7.What is the process for return or replacement of LM2576D2TR4-012?
All LM2576D2TR4-012 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2TR4-012, 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 LM2576D2TR4-012 part is unused and in its original packaging.
Return procedure for LM2576D2TR4-012:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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