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onsemi LM2576D2T-005
- Part No.:
- LM2576D2T-005
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2T-005.pdf
- Description:
- IC REG BUCK 5V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,183
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Product details
Overview
LM2576D2T-005 from onsemi is a monolithic 3.0 A, 5.0 V fixed-output step-down (buck) switching regulator in D2PAK package, featuring 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, cycle-by-cycle current limiting, and thermal shutdown - designed for high-efficiency DC-DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the LM2576D2T-005 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 7–40 V input range, 5.0 V ±4% regulated output, and D2PAK thermal performance with RJC = 5.0 °C/W - critical for heatsink-limited or convection-cooled designs.
Technical Context
The LM2576D2T-005 integrates a 1.0 A NPN switch with 1.5 V typical saturation voltage, error amplifier referenced to 1.23 V bandgap, and fixed-frequency PWM controller operating at 52 kHz (±10% over temperature). Its feedback loop uses external resistive divider only in adjustable versions; the -005 variant routes internal 5.0 V reference directly to output sensing.
Shutdown is TTL-compatible via Pin 5 (ON/OFF), with 1.4 V typical turn-on threshold and 80 µA standby quiescent current. Protection includes cycle-by-cycle peak current limit (4.2–7.5 A), thermal shutdown at 150 °C junction, and output leakage <2.0 mA at 0 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±4% over −40 °C to +125 °C, 0.5–3.0 A load, 8–40 V input - ensures stable rail for microcontrollers and analog circuitry without post-regulation. |
| Max Output Current | 3.0 A continuous - supports single-rail power for FPGA I/O banks or motor drivers without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - enables direct operation from 12 V/24 V industrial buses or unregulated AC-DC outputs. |
| Oscillator Frequency | 52 kHz ±10% (−40 to +125 °C) - balances EMI control and inductor size; reduces filter component cost vs. MHz-class regulators. |
| Efficiency | 77% typical at 12 VIN, 3.0 A, 5 VOUT - cuts power loss by >50% vs. linear regulators, eliminating need for large heatsinks. |
| Thermal Resistance | RJC = 5.0 °C/W - allows direct heatsink mounting to Pin 3 (GND) for reliable 3 A operation at ≤65 °C ambient with minimal thermal interface material. |
| Standby Current | 80 µA typical at 25 °C - enables low-power system sleep modes without auxiliary LDOs or discrete MOSFET switches. |
Pinout & Package
D2PAK (TO-263) package, Case 936A, with heatsink surface electrically connected to Pin 3 (GND); requires minimum 1.5 cm² copper pour for thermal relief in PCB layout.
| 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 within 5 mm to suppress switching transients. |
| 2 - Output | Emiter of internal NPN switch | Delivers regulated 5.0 V; PCB copper area must be minimized to reduce EMI coupling into sensitive analog sections. |
| 3 - GND | Circuit ground / heatsink connection | Common return for all currents; thermal pad must be soldered to ≥1.5 cm² internal/external copper plane for RJA = 70 °C/W. |
| 4 - Feedback | Output voltage sense node | Internally tied to 5.0 V reference; no external resistors needed - simplifies layout and eliminates resistor drift errors. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator, dropping input current to 80 µA; open or logic-low (<1.0 V) enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% accuracy across temperature and load. |
| Integrated thermal shutdown | Automatically disables switching at 150 °C junction, preventing permanent damage during overload or poor heatsinking - no external sensor required. |
| 52 kHz fixed-frequency operation | Enables use of low-cost, high-saturation-current toroidal inductors (e.g., Pulse PE-92108) without EMI filtering complexity of variable-frequency controllers. |
| Cycle-by-cycle current limiting | Clamps peak switch current to 4.2–7.5 A, protecting against short-circuit faults without latch-up - supports auto-recovery after fault removal. |
| TTL shutdown interface | Allows direct connection to microcontroller GPIO pins for system-level power sequencing, reducing need for level-shifting circuitry. |
Applications
| Industrial PLC I/O Power | Embedded System Main Rail |
|---|---|
Use Scenario: Providing isolated 5 V power to digital I/O modules in programmable logic controllers operating from 24 V DC field buses. IC Role / Device Role / Timing Role: Primary buck converter delivering 3 A continuous current to drive optocouplers, relay drivers, and bus transceivers. Use Value: High efficiency (77%) minimizes heat buildup in sealed enclosures; wide 7–40 V input accommodates brownout and surge conditions per IEC 61000-4-5. | Use Scenario: Generating main 5 V supply for ARM Cortex-M7-based edge gateway with Ethernet, USB, and multiple sensor interfaces. IC Role / Device Role / Timing Role: Core power IC converting unregulated 12 V board input to clean 5 V rail for SoC, PHYs, and peripherals. Use Value: D2PAK thermal design enables convection-only cooling; 80 µA standby current extends battery backup runtime during firmware updates. |
| Test Equipment Auxiliary Supply | LED Driver Bias Rail |
Use Scenario: Powering analog front-end circuitry (op-amps, ADCs, DACs) in portable multimeters and signal generators. IC Role / Device Role / Timing Role: Low-noise, high-stability 5 V source with tight ±4% regulation ensuring measurement accuracy across temperature. Use Value: Internal 1.23 V reference and fixed feedback eliminate resistor tolerance errors; 52 kHz frequency avoids interference with audio-band measurements. | Use Scenario: Supplying bias voltage to constant-current LED driver ICs in architectural lighting controls. IC Role / Device Role / Timing Role: Pre-regulator stepping down 24 V bus to 5 V for driver logic and communication interfaces (UART, DALI). Use Value: 3 A capability supports multi-channel drivers; thermal shutdown prevents thermal runaway if LED strings fail open. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-5.0 | TO-220 package (Case 314B), RJA = 65 °C/W, same electrical specs - lower thermal performance, requires larger heatsink for 3 A. | Suitable for prototyping or low-volume assemblies where through-hole mounting is preferred. | Select when mechanical compatibility with legacy TO-220 footprints is mandatory and thermal headroom permits. |
| MP1584EN-LF-Z | 3 A synchronous buck, 1.5 MHz switching, adjustable output, smaller SOIC-8 package - higher efficiency (90%), but requires external feedback resistors and careful layout for EMI. | Better for space-constrained designs needing higher efficiency or adjustable output; not drop-in compatible. | Choose when board area is limited and 1.5 MHz operation is acceptable; verify EMI compliance for sensitive RF environments. |
Compared with LM2576T-5.0, the LM2576D2T-005 delivers superior thermal management via D2PAK's lower RJC; versus MP1584EN-LF-Z, it trades higher efficiency and frequency for simpler design, fixed output, and proven ruggedness in industrial settings.
Availability
LM2576D2T-005 is available at Aetrix Electronics and suitable for industrial PLCs, embedded gateways, and test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2576D2T-005 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2576 series was engineered as a robust, low-component-count buck regulator family targeting cost-sensitive industrial and embedded power supplies where reliability, thermal resilience, and ease of design outweigh ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2576D2T-005?
The LM2576D2T-005 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 to the internal NPN switch and control circuitry. For sustained 40 V operation, ensure adequate heatsinking due to increased power dissipation - thermal shutdown activates at 150 °C junction temperature.
Does LM2576D2T-005 require external feedback resistors to set the 5.0 V output?
No, LM2576D2T-005 does not require external feedback resistors. It is the fixed 5.0 V output variant: Pin 4 (Feedback) is internally connected to the 5.0 V reference, eliminating resistor selection, placement, and tolerance errors. This simplifies PCB layout and improves long-term stability compared to adjustable versions like LM2576ADJ.
Can LM2576D2T-005 be used in a negative-output (buck-boost) configuration?
Yes, LM2576D2T-005 can be configured as a positive-to-negative converter using the standard buck-boost topology shown in the datasheet. In this mode, Pin 2 (Output) becomes the negative rail output, Pin 3 (GND) serves as the system ground, and the inductor/diode/capacitor connections are rearranged. Output current capability remains 3.0 A, but regulation accuracy and ripple performance differ from standard buck operation.
What is the thermal resistance from junction to case (RJC) for LM2576D2T-005?
The LM2576D2T-005 has a specified thermal resistance of RJC = 5.0 °C/W. This value reflects heat transfer from the silicon die to the exposed metal pad (Pin 3/GND) of the D2PAK package. To achieve this rating, the thermal pad must be fully soldered to ≥1.5 cm² of copper on the PCB, with optional external heatsink attached to the pad surface.
Is LM2576D2T-005 lead-free and RoHS compliant?
Yes, LM2576D2T-005 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. Refer to onsemi's official packaging documentation for full compliance certificates and JEDEC MSL test reports.
LM2576D2T-005 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):
- 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-005 FAQ
1.How can I place an order for LM2576D2T-005 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2T-005 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-005 reliable?
The price and inventory of LM2576D2T-005 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2T-005 is usually 5 days.
3.What payment methods are accepted for LM2576D2T-005?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2T-005 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2T-005?
LM2576D2T-005 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2T-005 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-005?
For technical support, including LM2576D2T-005 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2T-005 requirements.
6.How does Aetrix verify that LM2576D2T-005 is sourced from the original manufacturer or authorized distributors?
All LM2576D2T-005 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-005 meets industry standards.
7.What is the process for return or replacement of LM2576D2T-005?
All LM2576D2T-005 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2T-005, 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-005 part is unused and in its original packaging.
Return procedure for LM2576D2T-005:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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