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onsemi LM2576D2TR4-3.3
- Part No.:
- LM2576D2TR4-3.3
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2TR4-3.3.pdf
- Description:
- IC REG BUCK 3.3V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
LM2576D2TR4-3.3 from onsemi is a monolithic 3.0 A, 52 kHz fixed-frequency step-down (buck) switching regulator with 3.3 V fixed output voltage, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 7.0 V to 40 V input and delivers high efficiency-up to 75% at 12 VIN/3.0 A-enabling compact, heatsink-free power supplies in industrial control and embedded systems.
For engineers reviewing the LM2576D2TR4-3.3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 52 kHz oscillator frequency with ±10% tolerance, TTL-compatible ON/OFF control (80 µA standby current), saturation voltage ≤1.8 V, and D2PAK (TO-263) package with heatsink-connected Pin 3.
Technical Context
The LM2576D2TR4-3.3 implements a voltage-mode controlled buck topology with an internal 1.23 V bandgap reference, error amplifier, 52 kHz oscillator, and 1.0 A NPN switch driver. Its feedback loop uses a precision internal resistor divider for fixed 3.3 V output, eliminating external programming resistors.
Protection features include cycle-by-cycle peak current limiting (typ. 5.8 A at 25 °C), thermal shutdown at ~150 °C junction temperature, and automatic oscillator frequency foldback to ~18 kHz under overload/short-circuit conditions to reduce average power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±4% (3.135–3.465 V over −40 °C to +125 °C, full load range) |
| Max Output Current | 3.0 A DC (guaranteed continuous output with proper thermal management) |
| Input Voltage Range | 7.0 V to 40 V (minimum dropout requires ≥3.3 V headroom; typical min operating Vin ≈ 6.5 V) |
| Oscillator Frequency | 52 kHz ±10% (42–63 kHz over −40 °C to +125 °C; folds back to ~18 kHz during fault) |
| Efficiency | 75% typ. at 12 VIN, 3.0 A, 3.3 VOUT (enables low thermal rise without heatsink in many layouts) |
| Standby Quiescent Current | 80 µA typ. at 25 °C when ON/OFF pin = 5.0 V (supports ultra-low-power system sleep modes) |
| Saturation Voltage | ≤2.0 V max at −40 °C to +125 °C, 3.0 A (limits conduction loss and thermal stress on internal switch) |
Pinout & Package
D2PAK (TO-263) package, case 936A, with heatsink surface (terminal 6 per outline drawing) electrically connected to Pin 3 (GND). RoHS-compliant, MSL Level 1.
| 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 near pin to suppress switching transients |
| 2 - Output | Emiter of internal NPN switch | Switching node driving inductor; PCB copper area must be minimized to reduce EMI coupling to sensitive circuits |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, catch diode, and feedback network; single-point grounding recommended |
| 4 - Feedback | Regulated output sensing input | Internally tied to 3.3 V divider; not accessible in fixed-output version-no external connection required |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator (80 µA standby); logic-low (<1.0 V) or open enables operation |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output | Eliminates external feedback resistors-reduces BOM count and layout sensitivity while ensuring ±4% regulation across temperature and load |
| Integrated protection | Thermal shutdown + cycle-by-cycle current limit prevent damage during overload, short circuit, or inadequate heatsinking |
| 52 kHz fixed frequency | Enables use of standard, low-cost off-the-shelf inductors (e.g., Pulse PE-92108, 100 µH) and simplifies EMI filtering design |
| TTL shutdown interface | Supports microcontroller-driven power sequencing with <100 µA standby current-critical for battery-powered or energy-conscious systems |
| D2PAK thermal performance | Junction-to-case thermal resistance of 5.0 °C/W allows >2 W dissipation with modest heatsinking-enables compact board-level designs |
Applications
| Industrial PLC Power Supply | Embedded Microcontroller Core Rail |
|---|---|
|
Use Scenario: Provides primary 3.3 V rail for programmable logic controller (PLC) CPU modules operating from 24 VDC field bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V input to stable 3.3 V for ARM Cortex-M7 MCU, FPGA configuration, and I/O buffers. Use Value: Delivers 3.0 A continuously with <±4% output accuracy across −40 °C to +85 °C ambient-ensuring deterministic timing and reliable boot under wide industrial temperature swings. |
Use Scenario: Powers 3.3 V core and I/O rails in automotive body control module (BCM) with 12 V battery input. IC Role / Device Role / Timing Role: Main DC-DC converter supplying regulated 3.3 V to microcontroller, CAN transceivers, and sensor interfaces. Use Value: 75% efficiency at full load minimizes heat buildup in sealed enclosures; 52 kHz switching avoids AM radio band interference. |
| Point-of-Load Converter for FPGA Boards | Pre-regulator for Linear LDOs |
|
Use Scenario: Generates clean 3.3 V intermediate rail on FPGA development board fed from 12 V ATX supply. IC Role / Device Role / Timing Role: High-current buck stage preceding low-noise LDOs that power FPGA I/O banks and transceivers. Use Value: Fixed 3.3 V output eliminates feedback tuning; D2PAK package supports direct heatsink mounting for sustained 2.5 A FPGA core loads. |
Use Scenario: Steps down 24 V industrial supply to 5 V before final LDO regulation to 3.3 V for analog sensors. IC Role / Device Role / Timing Role: Efficient pre-regulator reducing power loss and thermal burden on downstream linear regulators. Use Value: 88% efficiency (measured at 12 VIN/3.0 A for LM2576-12) cuts pre-LDO dissipation by >60% vs. direct 24 V → 3.3 V linear conversion. |
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-3.3 | TO-220 package (case 314B/D), higher RJA (65 °C/W), same electrical specs and pinout | Requires larger heatsink for 3.0 A continuous operation; less suitable for dense SMT layouts | Select when through-hole assembly or legacy footprint compatibility is required |
| MP1584EN-LF-Z | 4.5–28 V input, 3 A, 1.5 MHz switching, adjustable output; smaller SOIC-8 package, no integrated catch diode | Higher frequency enables smaller magnetics but demands careful layout for EMI; requires external diode and feedback resistors | Select when board space is constrained and design can accommodate external components and higher-frequency noise mitigation |
Compared with LM2576T-3.3, the LM2576D2TR4-3.3 offers superior thermal performance in SMT form; compared with MP1584EN-LF-Z, it trades higher frequency for simpler design, integrated protection, and fixed-output convenience-making it optimal for cost-sensitive, thermally demanding industrial buck applications.
Availability
LM2576D2TR4-3.3 is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded microcontroller core rails, FPGA point-of-load converters, and pre-regulator stages requiring stable component supply with long lifecycle support.
Supply support for LM2576D2TR4-3.3 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 electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The LM2576 series was designed as a robust, easy-to-use monolithic buck regulator family targeting cost-sensitive, high-reliability industrial and embedded power conversion-emphasizing minimal external components, integrated protection, and broad input voltage tolerance.
FAQ
What is the maximum input voltage rating for the LM2576D2TR4-3.3?
The LM2576D2TR4-3.3 has an absolute maximum input voltage rating of 45 V, but its specified operating input range is 7.0 V to 40 V. Operation above 40 V risks exceeding safe operating area limits and may trigger internal protection or cause permanent damage. For reliable long-term operation, keep input voltage ≤40 V under all conditions including transients.
Does the LM2576D2TR4-3.3 require external feedback resistors?
No. The LM2576D2TR4-3.3 is the fixed 3.3 V output variant and contains an internal precision resistor divider. Pin 4 (Feedback) is internally connected and must remain unconnected-no external resistors or compensation components are needed, simplifying layout and improving regulation stability.
Can the LM2576D2TR4-3.3 drive a 3.0 A load continuously without a heatsink?
Yes-under specific conditions: ambient temperature ≤50 °C, adequate PCB copper area (≥4 cm² 2-oz copper connected to Pin 3), and good airflow. At 12 VIN/3.3 VOUT/3.0 A, power dissipation is ~2.3 W. With D2PAK's 5.0 °C/W RJC, junction temperature rise is ~11.5 °C above case-well within the 150 °C max if case temperature stays below 138 °C.
What catch diode is recommended for use with the LM2576D2TR4-3.3?
onsemi recommends the MBR360 Schottky diode (3 A, 60 V) for the LM2576D2TR4-3.3, as specified in the datasheet Figure 15 and Table 1. Its low forward voltage (~0.55 V) minimizes conduction loss, and its fast recovery prevents reverse recovery spikes-critical for stable 52 kHz operation and low EMI.
How does the ON/OFF pin function on the LM2576D2TR4-3.3?
The ON/OFF pin (Pin 5) provides TTL-compatible enable control: applying ≥2.2 V disables the regulator, reducing quiescent current to 80 µA typical; applying ≤1.0 V or leaving the pin open enables normal operation. This feature supports low-power system states and sequenced power-up/down in multi-rail systems using the LM2576D2TR4-3.3.
LM2576D2TR4-3.3 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):
- 3.3V
- 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
LM2576D2TR4-3.3 FAQ
1.How can I place an order for LM2576D2TR4-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2TR4-3.3 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 LM2576D2TR4-3.3 reliable?
The price and inventory of LM2576D2TR4-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2TR4-3.3 is usually 5 days.
3.What payment methods are accepted for LM2576D2TR4-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2TR4-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2TR4-3.3?
LM2576D2TR4-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2TR4-3.3 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 LM2576D2TR4-3.3?
For technical support, including LM2576D2TR4-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2TR4-3.3 requirements.
6.How does Aetrix verify that LM2576D2TR4-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2576D2TR4-3.3 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 LM2576D2TR4-3.3 meets industry standards.
7.What is the process for return or replacement of LM2576D2TR4-3.3?
All LM2576D2TR4-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2TR4-3.3, 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 LM2576D2TR4-3.3 part is unused and in its original packaging.
Return procedure for LM2576D2TR4-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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