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onsemi LM2576D2TR4-005
- Part No.:
- LM2576D2TR4-005
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2TR4-005.pdf
- Description:
- IC REG BUCK 5V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,731
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Product details
Overview
LM2576D2TR4-005 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 fixed-frequency PWM control, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF pin. Used in industrial power supplies requiring high-efficiency DC-DC conversion with minimal external components.
For engineers reviewing the LM2576D2TR4-005 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 52 kHz oscillator tolerance (±10%), saturation voltage ≤1.8 V at 3.0 A, standby current of 80 µA, and compatibility with standard off-the-shelf inductors (e.g., 100 µH Pulse PE-92108).
Technical Context
The LM2576D2TR4-005 integrates a 3.0 A NPN bipolar switch, 1.23 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 employs voltage-mode PWM control with fixed frequency, enabling predictable EMI filtering. The internal switch exhibits 1.5 V typical saturation voltage at 25 °C, and the ON/OFF pin provides logic-level shutdown with 1.4 V threshold and 80 µA standby quiescent current - critical for low-power system states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 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 FPGA I/O banks or motor drivers without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - accommodates 12 V/24 V industrial buses and automotive battery variations with headroom for transients. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0 °C to 125 °C) - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to MHz-range converters. |
| Saturation Voltage | ≤1.8 V at 3.0 A and −40 °C to +125 °C - limits conduction loss and thermal rise, permitting operation without heatsink at moderate ambient temperatures. |
| Standby Quiescent Current | 80 µA typical at 25 °C when ON/OFF pin = 5.0 V - enables ultra-low-power sleep modes in battery-backed systems. |
| Thermal Shutdown | Active at TJ ≥150 °C - protects device and PCB during overload or poor heatsinking; auto-recovery upon cooling. |
Pinout & Package
D2PAK (TO-263) package, case 936A, with heatsink surface electrically connected to Pin 3 (GND). Surface-mount footprint compatible with standard reflow profiles; moisture sensitivity level (MSL) = 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR aluminum electrolytic bypass capacitor to suppress switching transients. |
| 2 - Output | Emiter of internal NPN switch | Delivers regulated 5.0 V; PCB copper area must be minimized to reduce coupling into sensitive analog/feedback paths. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, diode cathode, and heatsink; single-point grounding recommended to avoid ground loops. |
| 4 - Feedback | Regulation sense node | Internally tied to 5.0 V output - no external resistor required; open-circuit or short-circuit here disables regulation. |
| 5 - ON/OFF | Logic-enable control input | TTL-compatible: <1.4 V = ON, >2.2 V = OFF; draws ≤30 µA when high; enables system-level power sequencing and low-power standby. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors and associated layout sensitivity - reduces BOM count and improves long-term stability. |
| Cycle-by-cycle current limit | Peak current limit of 4.2–6.9 A (25 °C) protects against short-circuit and inductor saturation - avoids latch-up during fault conditions. |
| 52 kHz fixed-frequency operation | Enables use of low-cost, high-current pulse inductors (e.g., 100 µH) with predictable core loss and EMI filter design. |
| Thermal shutdown with auto-recovery | Shuts down at 150 °C junction temperature and resumes operation after cooldown - prevents permanent damage during sustained overload. |
| Pb-free D2PAK package | RoHS-compliant, MSL 1 - supports lead-free reflow assembly without baking; heatsink tab bonded to GND for efficient thermal transfer. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
|
Use Scenario: 24 V factory bus powering PLC I/O modules requiring clean 5 V logic rails. IC Role / Device Role / Timing Role: Primary buck converter delivering 3 A at 5 V with high efficiency (>77%) to minimize heat in enclosed enclosures. Use Value: Replaces linear regulators to cut power dissipation by >70%, eliminating need for heatsinks and reducing system size. |
Use Scenario: Pre-regulating 12 V input to 5 V before LDO for noise-sensitive ADCs and sensors in edge devices. IC Role / Device Role / Timing Role: High-efficiency front-end stage reducing thermal load on downstream LDO; 52 kHz switching allows compact LC filtering. Use Value: Enables >85% overall efficiency while maintaining <10 mV ripple - preserves signal integrity without oversized bulk capacitance. |
| On-Card DC-DC Conversion | Battery Charger Power Stage |
|
Use Scenario: Local 5 V generation on a dense MCU carrier board with space constraints and limited airflow. IC Role / Device Role / Timing Role: Integrated switcher with only 4 external components (diode, inductor, input/output caps) - minimizes PCB real estate. Use Value: D2PAK thermal performance supports 3 A continuous output at 50 °C ambient without forced air - simplifies thermal design. |
Use Scenario: Charging circuit for 12 V sealed lead-acid battery from variable solar panel input (18–36 V). IC Role / Device Role / Timing Role: Constant-voltage stage regulating 5 V auxiliary rail for charge controller IC and status LEDs. Use Value: Wide 7–40 V input range accepts fluctuating PV voltage; ON/OFF pin enables charger enable/disable via microcontroller GPIO. |
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), same electrical specs but higher RJA (65 °C/W vs. 70 °C/W), requires mechanical heatsink mounting. | Preferred where through-hole assembly or user-serviceable heatsinking is required; less suitable for high-density SMT layouts. | Select LM2576T-5.0 if manual assembly, field repair, or discrete heatsink attachment is needed; LM2576D2TR4-005 preferred for automated SMT and thermal pad integration. |
| MP1584EN-LF-Z | 4.5–28 V input, 3 A, 1.5 MHz switching, adjustable output; smaller SOIC-8 package; no integrated switch emitter connection to pin 2. | Used where higher frequency allows smaller magnetics, but requires external feedback resistors and has narrower input range. | Choose MP1584EN-LF-Z for space-constrained designs needing <1 MHz switching and adjustable output; LM2576D2TR4-005 better for wide-input, fixed-5V, robust industrial environments. |
Compared with LM2576T-5.0, LM2576D2TR4-005 offers superior thermal resistance to ambient in SMT form and eliminates mechanical fasteners; versus MP1584EN-LF-Z, it trades higher frequency for wider input range, fixed output simplicity, and proven ruggedness in harsh voltage environments.
Availability
LM2576D2TR4-005 is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, on-card DC-DC conversion, and battery charger auxiliary rails requiring stable component supply and long-term manufacturability.
Supply support for LM2576D2TR4-005 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 designed as a robust, easy-to-use monolithic buck regulator family targeting cost-sensitive, high-reliability industrial and embedded power systems - emphasizing minimal external parts, thermal resilience, and wide input flexibility.
FAQ
What is the maximum input voltage rating for LM2576D2TR4-005?
The LM2576D2TR4-005 has a maximum supply voltage (Vin) rating of 45 V per absolute maximum ratings, 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 reliability degradation. Always maintain ≥1 V margin below 45 V in transient conditions.
Does LM2576D2TR4-005 require an external feedback resistor network?
No. LM2576D2TR4-005 is the fixed 5.0 V output version - its feedback node (Pin 4) is internally connected to the 5.0 V output. No external resistors are needed, unlike the adjustable LM2576-ADJ variant. Adding external resistors will disrupt regulation and is not supported.
What is the thermal resistance (RJA) of LM2576D2TR4-005 in its D2PAK package?
The LM2576D2TR4-005 in D2PAK (case 936A) has a specified thermal resistance from junction-to-ambient (RJA) of 70 °C/W under standard JEDEC test conditions. Actual RJA depends heavily on PCB copper area, layer count, and heatsink use - typical production layouts achieve 35–50 °C/W with 2 oz copper and 2-in² thermal pad.
Can LM2576D2TR4-005 be used in negative-output (buck-boost) configurations?
Yes - the LM2576D2TR4-005 can be configured as a positive-to-negative converter using the standard buck-boost topology shown in Figure 1 of the datasheet. In this mode, Pin 2 (Output) becomes the negative output node, and Pin 3 (GND) serves as the system ground. Output voltage magnitude remains 5.0 V, polarity inverted.
What catch diode is recommended for LM2576D2TR4-005 in a 3 A application?
onsemi recommends the MBR360 Schottky diode (60 V, 3 A) for LM2576D2TR4-005 at full 3 A load. Its low forward voltage (~0.55 V) minimizes conduction loss, and its 60 V reverse rating exceeds the 40 V max input with safety margin. For higher reliability, MBRD360CT (dual common-cathode) is also validated in the datasheet.
LM2576D2TR4-005 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):
- 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
LM2576D2TR4-005 FAQ
1.How can I place an order for LM2576D2TR4-005 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2TR4-005 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 LM2576D2TR4-005 reliable?
The price and inventory of LM2576D2TR4-005 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2TR4-005 is usually 5 days.
3.What payment methods are accepted for LM2576D2TR4-005?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2TR4-005 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2TR4-005?
LM2576D2TR4-005 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2TR4-005 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 LM2576D2TR4-005?
For technical support, including LM2576D2TR4-005 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2TR4-005 requirements.
6.How does Aetrix verify that LM2576D2TR4-005 is sourced from the original manufacturer or authorized distributors?
All LM2576D2TR4-005 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 LM2576D2TR4-005 meets industry standards.
7.What is the process for return or replacement of LM2576D2TR4-005?
All LM2576D2TR4-005 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2TR4-005, 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 LM2576D2TR4-005 part is unused and in its original packaging.
Return procedure for LM2576D2TR4-005:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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