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onsemi LM2576D2T-005G
- Part No.:
- LM2576D2T-005G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2T-005G.pdf
- Description:
- IC REG BUCK 5V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:551
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Product details
Overview
LM2576D2T-005G from onsemi is a monolithic 3.0 A, 5.0 V fixed-output step-down (buck) switching regulator in D2PAK package. It operates from 7.0–40 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 requiring high efficiency and minimal external components.
For engineers reviewing the LM2576D2T-005G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, fixed 5.0 V output with ±4% tolerance, D2PAK thermal performance (RJC = 5.0 °C/W), 80 µA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576D2T-005G integrates a 3.0 A NPN switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and thermal/current protection circuitry. Its fixed 5.0 V output eliminates external feedback resistors, simplifying design while maintaining ±4% regulation across −40 °C to +125 °C junction temperature and 0.5–3.0 A load range.
It uses voltage-mode PWM control with fixed-frequency operation and automatic frequency foldback (to ~18 kHz) under overload/short-circuit conditions. The internal switch exhibits 1.5 V typical saturation voltage at 3.0 A, enabling efficient conversion especially at higher input voltages where linear regulators would dissipate excessive heat.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - ensures stable logic supply without trimming. |
| Max Output Current | 3.0 A continuous - supports mid-power embedded systems without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - accommodates 12 V/24 V industrial rails and automotive battery variations. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0–125 °C) - enables use of low-cost, high-saturation-current inductors with minimal EMI filtering. |
| Standby Quiescent Current | 80 µA typical at 25 °C - allows low-power shutdown mode for battery-backed or energy-sensitive applications. |
| Thermal Resistance | Junction-to-case = 5.0 °C/W - enables direct heatsink mounting via exposed tab (Pin 3) for reliable 3 A operation without PCB copper flooding. |
| Protection Features | Cycle-by-cycle current limit (4.2–6.9 A peak), thermal shutdown, and safe ON/OFF logic interface - provides robust fault recovery without external supervision. |
Pinout & Package
D2PAK (TO-263) package, Case 936A, with heatsink surface electrically connected to Pin 3 (GND). Exposed metal tab serves as primary thermal path and must be soldered to large copper area or external heatsink.
| 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 injection. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 5.0 V; PCB copper area must be minimized to reduce coupling into sensitive analog circuits. |
| 3 - GND | Circuit ground / heatsink connection | Common return for all signals and thermal interface; must be low-inductance single-point connection to avoid ground bounce. |
| 4 - Feedback | Regulation sense input | Internally tied to 5.0 V output - unused in fixed-version; leave unconnected or tie to GND per layout guidelines. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator (80 µA standby); logic-low (<1.2 V) or open enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external resistor divider, reducing BOM count and improving long-term stability vs. adjustable variants. |
| 52 kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with widely available, cost-optimized 100 µH power inductors. |
| Integrated thermal shutdown | Automatically disables output when junction exceeds 150 °C, preventing damage during sustained overload or poor heatsinking. |
| TTL-compatible ON/OFF pin | Allows microcontroller-based power sequencing without level-shifting; consumes only 80 µA in shutdown state. |
| Current-limit protection | Peak current limit of 4.2–6.9 A prevents destructive inductor saturation and MOSFET failure during short-circuit events. |
Applications
| Industrial PLC Power Supply | Embedded System Pre-regulator |
|---|---|
Use Scenario: Provides clean 5.0 V rail for microcontrollers and I/O drivers in programmable logic controllers operating from 24 VDC field buses. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5.0 V at up to 3.0 A with ±4% accuracy across −40 °C to +85 °C ambient. Use Value: Replaces linear regulators to cut power dissipation by >60%, eliminating need for bulky heatsinks in confined DIN-rail enclosures. | Use Scenario: Generates intermediate 5.0 V supply feeding low-noise LDOs for FPGA core and I/O banks in edge-computing gateways. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down 12 V system rail before final LDO regulation. Use Value: Achieves 77% efficiency at 3.0 A load (Vin = 12 V), reducing thermal load on downstream LDOs and improving overall system MTBF. |
| On-Card DC-DC Converter | Battery Charger Auxiliary Supply |
Use Scenario: Integrated 5.0 V power stage on motor-control board powering gate drivers, sensors, and communication ICs. IC Role / Device Role / Timing Role: Self-contained buck regulator with minimal external parts (4 components total), mounted directly on host PCB. Use Value: Reduces component count and layout complexity versus discrete switcher designs, accelerating time-to-market for certified industrial hardware. | Use Scenario: Powers charging controller ICs and status LEDs in 12 V lead-acid or LiFePO₄ battery chargers. IC Role / Device Role / Timing Role: Standalone 5.0 V source derived from charger's main DC bus, supporting logic and display functions during charge cycles. Use Value: Maintains operation even during deep discharge (down to 7 V input), with built-in short-circuit protection safeguarding charger firmware during fault conditions. |
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-5.0 | TO-220 package (Case 314B/D); RJA = 65 °C/W vs. D2PAK's 70 °C/W; same electrical specs. | Requires mechanical heatsink mounting; less suitable for high-density SMT layouts. | Choose for through-hole assembly or when existing TO-220 footprint is fixed. |
| MP1584EN-LF-Z | 4.5–28 V input; 3 A; adjustable/fixed 5 V; 1.5 MHz switching; smaller solution size but higher EMI sensitivity. | Requires careful layout for EMI compliance; not drop-in due to different pinout, frequency, and compensation. | Choose for space-constrained designs needing higher frequency and lower output ripple - not a pin-for-pin replacement. |
Compared with LM2576T-5.0, the LM2576D2T-005G offers superior thermal resistance to case (5.0 °C/W) and surface-mount compatibility, while MP1584EN-LF-Z trades robustness and layout simplicity for higher integration and frequency - making LM2576D2T-005G preferable for industrial environments demanding proven reliability and ease of qualification.
Availability
LM2576D2T-005G 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 consistent thermal performance.
Supply support for LM2576D2T-005G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2576 series was designed specifically for cost-sensitive, high-reliability industrial and embedded power conversion - prioritizing ruggedness, minimal external parts, and wide-input-voltage operation over ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2576D2T-005G?
The LM2576D2T-005G has an absolute maximum input voltage rating of 45 V, with recommended operating range of 7.0 V to 40 V. Exceeding 45 V risks permanent damage. For reliable 3.0 A operation at high ambient temperatures, input voltage should remain ≤40 V to maintain thermal margin within the D2PAK package's capabilities.
Does LM2576D2T-005G require external feedback resistors?
No. The LM2576D2T-005G is a fixed 5.0 V output variant - its feedback network is fully internal. Pin 4 (Feedback) is internally connected to the 5.0 V output and must be left unconnected or tied to ground per onsemi layout recommendations; adding external resistors will disrupt regulation.
What is the thermal performance of LM2576D2T-005G in its D2PAK package?
The LM2576D2T-005G in D2PAK (Case 936A) has a junction-to-case thermal resistance of 5.0 °C/W and junction-to-ambient of 70 °C/W. With proper heatsinking via the exposed tab (Pin 3), it sustains 3.0 A continuous output at +85 °C ambient; derating is required above that temperature without forced air or enhanced copper.
Can LM2576D2T-005G be used in battery-powered applications?
Yes - the LM2576D2T-005G supports input as low as 7.0 V, making it suitable for 12 V sealed lead-acid or multi-cell Li-ion battery systems. Its 80 µA standby current in shutdown mode (ON/OFF pin high) enables ultra-low quiescent drain, preserving battery life during sleep states in portable or remote equipment.
What type of catch diode is recommended for LM2576D2T-005G?
onsemi recommends Schottky diodes such as MBR360 (60 V, 3 A) or 1N5822 for the LM2576D2T-005G. These provide low forward voltage (~0.5 V), fast recovery, and adequate surge current rating. The diode's reverse voltage rating must exceed the maximum input voltage by ≥25%, and its average current rating should be ≥1.2× the load current.
LM2576D2T-005G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- 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):
- 5V
- 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-005G FAQ
1.How can I place an order for LM2576D2T-005G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2T-005G 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-005G reliable?
The price and inventory of LM2576D2T-005G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2T-005G is usually 5 days.
3.What payment methods are accepted for LM2576D2T-005G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2T-005G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2T-005G?
LM2576D2T-005G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2T-005G 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-005G?
For technical support, including LM2576D2T-005G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2T-005G requirements.
6.How does Aetrix verify that LM2576D2T-005G is sourced from the original manufacturer or authorized distributors?
All LM2576D2T-005G 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-005G meets industry standards.
7.What is the process for return or replacement of LM2576D2T-005G?
All LM2576D2T-005G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2T-005G, 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-005G part is unused and in its original packaging.
Return procedure for LM2576D2T-005G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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