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onsemi LM2576D2T-012G
- Part No.:
- LM2576D2T-012G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2T-012G.pdf
- Description:
- IC REG BUCK 12V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,877
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Product details
Overview
LM2576D2T-012G 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 internal 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 LM2576D2T-012G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 12 V fixed output with ±4% tolerance, D2PAK thermal performance (RJC = 5.0 °C/W), and compatibility with standard off-the-shelf inductors (e.g., Pulse PE-92108).
Technical Context
The LM2576D2T-012G 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 while maintaining regulation across −40 °C to +125 °C junction temperature.
It uses voltage-mode PWM control with fixed frequency operation and includes an internal 3.1 V regulator for biasing. The ON/OFF pin enables logic-level shutdown with 80 µA standby current, and the output switch saturation voltage is 1.5 V (typ) at 3.0 A, directly impacting conduction loss and efficiency at high load currents.
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 trimming. |
| Max Output Current | 3.0 A continuous - supports mid-power applications like motor drivers or FPGA I/O banks without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - accommodates 12 V and 24 V industrial bus systems with margin for transients. |
| Oscillator Frequency | 52 kHz (±10% over 0–125 °C) - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to MHz-range converters. |
| Efficiency | 88% at 15 VIN, 3.0 A load - minimizes thermal dissipation; often eliminates need for heatsink in ambient ≤50 °C. |
| Thermal Resistance | Junction-to-case RJC = 5.0 °C/W - enables direct heatsinking via exposed pad (Pin 3) for high-power operation in compact layouts. |
| Shutdown Current | 80 µA typical at 25 °C - suitable for battery-backed or low-power standby modes in always-on systems. |
Pinout & Package
D2PAK (TO-263) package, Case 936A, with heatsink surface electrically connected to Pin 3 (GND). Exposed thermal pad must be soldered to PCB copper area for optimal thermal 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 noise. |
| 2 - Output | Emiter of internal NPN switch | Delivers regulated 12 V; PCB trace area must be minimized to reduce coupling into sensitive analog sections. |
| 3 - GND | Circuit ground / thermal pad connection | Common return path and primary thermal conduction path; must be connected to large copper pour for heat dissipation. |
| 4 - Feedback | Regulation sense input | Internally tied to 12 V divider; unused in fixed-version - leave unconnected (no external components required). |
| 5 - ON/OFF | Logic-enable control | TTL-compatible: <1.4 V = ON, >2.2 V = OFF; 80 µA standby current when pulled high to Vin or 5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors and associated layout sensitivity - reduces BOM count and improves long-term stability. |
| Integrated thermal shutdown | Automatically disables switching if junction exceeds 150 °C - prevents catastrophic failure during overload or poor heatsinking. |
| Cycle-by-cycle current limit | Peak current limit of 4.2–6.9 A (varies with temperature) - protects against short-circuit and inductor saturation events. |
| 52 kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with widely available, cost-optimized 100 µH power inductors (e.g., Pulse PE-92108). |
| TTL shutdown capability | Supports microcontroller GPIO control with no level-shifting - simplifies system power sequencing and sleep-mode integration. |
Applications
| Industrial PLC Power Supply | Embedded System Pre-regulator |
|---|---|
|
Use Scenario: Provides clean 12 V rail from 24 V factory bus to power I/O modules and communication interfaces. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 12 V at up to 3.0 A with line/load regulation better than ±1%. Use Value: Replaces linear regulators to cut power loss by >70%, enabling fanless enclosure design in DIN-rail mounted controllers. |
Use Scenario: Generates stable 12 V intermediate rail feeding downstream LDOs for MCU core, memory, and peripherals. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing thermal stress on final LDO stage and improving overall system PSRR. Use Value: Achieves 88% efficiency at full load, lowering total board temperature rise and easing thermal management for dense SMT layouts. |
| On-Card DC-DC Converter | Battery Charger Power Stage |
|
Use Scenario: Integrated 12 V supply on motor control board powering gate drivers and isolated feedback circuitry. IC Role / Device Role / Timing Role: Self-contained buck regulator with integrated switch and protection - no external MOSFET or controller needed. Use Value: Reduces component count by ≥6 vs. discrete buck solution; D2PAK package allows direct heatsink mounting to chassis. |
Use Scenario: Powers constant-voltage stage of 12 V lead-acid or LiFePO4 battery charger from unregulated adapter input. IC Role / Device Role / Timing Role: Robust front-end regulator handling wide-input variations (e.g., 15–36 V AC/DC adapter ripple) before precision charging IC. Use Value: Built-in current limit and thermal shutdown prevent damage during battery short or reverse-connection faults. |
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-12G | TO-220 package (Case 314D); higher RJA = 65 °C/W vs. D2PAK's 70 °C/W; same electrical specs. | Requires external heatsink for >1.5 A continuous operation; less suitable for high-density PCBs. | Select when mechanical mounting constraints favor TO-220 or legacy board reuse is required. |
| MP1584EN-LF-Z | 42 V input, 3 A sync-buck; 1.5 MHz switching; requires external compensation; smaller SO-8EP package. | Higher frequency enables smaller magnetics but increases EMI filtering complexity and sensitivity to layout. | Select when board space is critical and design team has experience with high-frequency buck loop compensation. |
Compared with LM2576T-12G, the LM2576D2T-012G offers superior thermal performance in surface-mount form; versus MP1584EN-LF-Z, it trades higher frequency for simpler design, proven reliability, and lower EMI susceptibility in industrial environments.
Availability
LM2576D2T-012G is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded system pre-regulators, and on-card DC-DC converters requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2576D2T-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 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 robust, easy-to-use monolithic buck regulator family targeting cost-sensitive industrial and embedded applications where simplicity, reliability, and thermal resilience are prioritized over ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for the LM2576D2T-012G?
The LM2576D2T-012G has an absolute maximum input voltage rating of 45 V, with recommended operating range of 7.0 V to 40 V. Operation above 40 V risks exceeding internal transistor breakdown limits and may trigger thermal shutdown or permanent damage. Always include input transient suppression (e.g., TVS diode) when interfacing with 24 V industrial buses subject to load-dump events.
Does the LM2576D2T-012G require external feedback resistors?
No - the LM2576D2T-012G is a fixed-output version with internal resistor divider set to 12 V. Pin 4 (Feedback) is internally connected and must remain unconnected in circuit. Adding external resistors will disrupt regulation and cause output voltage error or instability.
What inductor value is recommended for the LM2576D2T-012G at 3.0 A load?
A 100 µH inductor is recommended for the LM2576D2T-012G at 3.0 A, per Figure 19 in the datasheet. Pulse Engineering PE-92108 (100 µH, 3.5 A saturation current) is a validated option. Inductor DCR should be ≤150 mΩ to maintain efficiency >85% at full load.
How does the ON/OFF pin function on the LM2576D2T-012G?
The ON/OFF pin (Pin 5) enables logic-level shutdown: voltage <1.4 V (or open) = regulator ON; voltage >2.2 V = regulator OFF with 80 µA standby current. It is TTL-compatible and can be driven directly from a microcontroller GPIO without level shifting. Do not float this pin - tie to GND for always-on operation.
Is the LM2576D2T-012G RoHS compliant and halogen-free?
Yes - the LM2576D2T-012G is packaged in a Pb-Free (RoHS-compliant) D2PAK (Case 936A) and meets JESD204B halogen-free requirements. Moisture Sensitivity Level (MSL) is 1, allowing unlimited floor life at ≤30 °C/60% RH without dry-packaging.
LM2576D2T-012G 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-012G FAQ
1.How can I place an order for LM2576D2T-012G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2T-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 LM2576D2T-012G reliable?
The price and inventory of LM2576D2T-012G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2T-012G is usually 5 days.
3.What payment methods are accepted for LM2576D2T-012G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2T-012G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2T-012G?
LM2576D2T-012G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2T-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 LM2576D2T-012G?
For technical support, including LM2576D2T-012G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2T-012G requirements.
6.How does Aetrix verify that LM2576D2T-012G is sourced from the original manufacturer or authorized distributors?
All LM2576D2T-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 LM2576D2T-012G meets industry standards.
7.What is the process for return or replacement of LM2576D2T-012G?
All LM2576D2T-012G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2T-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 LM2576D2T-012G part is unused and in its original packaging.
Return procedure for LM2576D2T-012G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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