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onsemi LM2576D2TR4-5G
- Part No.:
- LM2576D2TR4-5G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2TR4-5G.pdf
- Description:
- IC REG BUCK 5V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,128
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Product details
Overview
LM2576D2TR4-5G from onsemi is a monolithic 3.0 A, 5.0 V fixed-output step-down (buck) switching regulator in D2PAK package. It operates with 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 LM2576D2TR4-5G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 5.0 V fixed output with ±4% tolerance, 52 kHz fixed-frequency operation, thermal shutdown protection, and compatibility with standard off-the-shelf inductors for rapid buck converter design.
Technical Context
The LM2576D2TR4-5G integrates a 3.0 A NPN switch, 1.23 V bandgap reference, error amplifier, 52 kHz oscillator, and PWM comparator in a single D2PAK package. Its fixed 5.0 V output eliminates external feedback resistors, simplifying layout and improving stability under varying load conditions.
It employs voltage-mode control with cycle-by-cycle current limiting and thermal shutdown to ensure robust operation during overload or short-circuit events. The ON/OFF pin enables logic-level shutdown with 80 µA standby current, supporting low-power system states without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over −40 °C to +125 °C, 0.5–3.0 A load, and 8–40 V input - 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 wide-input industrial or automotive battery-supplied systems without pre-regulation. |
| Switching Frequency | 52 kHz (±10% over temperature) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range regulators. |
| Efficiency | 77% at 12 VIN, 3.0 A, 5.0 VOUT - significantly reduces heat dissipation versus linear regulators, often eliminating heatsink requirements. |
| Protection Features | Cycle-by-cycle current limit (typ. 5.8 A peak), thermal shutdown, and 80 µA standby current in shutdown - provides fault resilience and low-power sleep modes. |
| Quiescent Current | 5.0 mA typical (−40 to +125 °C) - maintains low no-load power draw in always-on subsystems. |
Pinout & Package
D2PAK (TO-263) package, case 936A, with heatsink surface electrically connected to Pin 3 (GND). Standard 5-pin configuration optimized for high-current thermal performance and PCB heat spreading.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR capacitor to suppress switching transients and supply peak current. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 5.0 V; saturation voltage ≤1.8 V at 3.0 A - dictates minimum dropout and conduction loss. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, catch diode, and inductor; also connects to exposed heatsink tab for thermal path. |
| 4 - Feedback | Regulation sense node | Internally tied to 5.0 V output divider; unused in fixed-version parts - must be left unconnected per datasheet. |
| 5 - ON/OFF | Logic-controlled enable | TTL-compatible: <1.4 V = ON, >2.2 V = OFF; draws <30 µA when active - enables microcontroller-based power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors, reducing BOM count, layout sensitivity, and long-term drift from resistor aging or thermal mismatch. |
| 52 kHz fixed-frequency oscillator | Enables predictable EMI spectrum and simplifies filter design using widely available, cost-optimized 100 µH inductors (e.g., Pulse PE-92108). |
| Integrated thermal shutdown | Automatically disables output when junction temperature exceeds ~150 °C, preventing permanent damage during sustained overload or poor heatsinking. |
| TTL shutdown capability | Supports direct interfacing with 3.3 V or 5 V logic without level shifters; 80 µA standby current enables energy-efficient system sleep states. |
| Cycle-by-cycle current limiting | Clamps switch current on every cycle to ~5.8 A (typ.), limiting fault energy and enabling safe recovery from short-circuit events. |
Applications
| Industrial PLC Power Supply | Embedded System Pre-Regulator |
|---|---|
|
Use Scenario: Provides clean 5.0 V rail for digital I/O modules in programmable logic controllers operating from 24 VDC field buses. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V bus to isolated 5.0 V logic supply with high efficiency and thermal robustness. Use Value: Delivers full 3.0 A at 77% efficiency, minimizing board-level heat and eliminating need for heatsinks in confined enclosures. |
Use Scenario: Generates stable 5.0 V intermediate rail for downstream LDOs powering sensitive analog sensors and ADCs in IoT edge nodes. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing voltage differential across linear regulators to improve overall system efficiency. Use Value: Reduces total power loss by >60% compared to direct 12 V-to-5 V linear regulation, extending battery life in portable designs. |
| On-Card DC-DC Converter | Battery Charger Power Stage |
|
Use Scenario: Integrated 5.0 V power solution on compact PCBs for network interface cards requiring reliable, low-noise supply independent of motherboard rails. IC Role / Device Role / Timing Role: Self-contained buck converter with only 4 external components - inductor, catch diode, input/output capacitors. Use Value: Achieves complete power conversion in <1.5 cm² footprint using standard D2PAK layout and off-the-shelf passive components. |
Use Scenario: Supplies regulated 5.0 V bias to charging ICs and status LEDs in multi-cell Li-ion battery chargers powered from 12–24 V adapters. IC Role / Device Role / Timing Role: Robust front-end regulator tolerant of adapter ripple and transient surges during plug-in events. Use Value: Withstands 40 V max input and includes thermal/current protection - prevents latch-up or damage during charger 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), higher RJA (65 °C/W), same electrical specs and pinout. | Suitable for lower-power or prototype builds where heatsinking is simpler; less efficient thermal transfer than D2PAK. | Select when mechanical mounting constraints favor TO-220 or when legacy board layouts require identical footprint. |
| MP1584EN-LF-Z | 42 V input, 3 A, 1.5 MHz switching, smaller SO-8EP package, requires external feedback resistors. | Better suited for space-constrained designs needing higher frequency and lower output ripple; lacks fixed-output simplicity. | Choose for compact, high-density boards where 1.5 MHz operation allows smaller passives, accepting added design complexity. |
Compared with LM2576T-5.0, the LM2576D2TR4-5G offers superior thermal performance via D2PAK's lower RJC (5.0 °C/W) and heatsink tab; versus MP1584EN-LF-Z, it trades higher-frequency efficiency for fixed-output simplicity and proven ruggedness in industrial environments.
Availability
LM2576D2TR4-5G is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded system pre-regulators, on-card DC-DC converters, and battery charger power stages requiring stable component supply and long-lifecycle support.
Supply support for LM2576D2TR4-5G 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 for cost-sensitive, high-reliability industrial and embedded power conversion - prioritizing simplicity, thermal robustness, and minimal external component count over ultra-high frequency or digital control.
FAQ
What is the maximum input voltage rating for the LM2576D2TR4-5G?
The LM2576D2TR4-5G has an absolute maximum input voltage of 45 V, but its recommended operating range is 7.0 V to 40 V. Operation above 40 V risks exceeding internal transistor breakdown limits and may trigger premature thermal shutdown. For 40 V nominal inputs, ensure adequate derating and heatsinking per the datasheet's thermal resistance values (RJC = 5.0 °C/W, RJA = 70 °C/W).
Does the LM2576D2TR4-5G require external feedback resistors?
No - the LM2576D2TR4-5G is the fixed 5.0 V output version, with internal resistor divider setting the output. Pin 4 (Feedback) is internally connected and must remain unconnected in circuit. External resistors are only required for the adjustable version (LM2576-ADJ); adding them to LM2576D2TR4-5G would disrupt regulation and cause output instability.
What type of catch diode is recommended for use with the LM2576D2TR4-5G?
A Schottky diode rated ≥3.0 A and ≥20 V reverse voltage is recommended - such as MBR360 (60 V, 3 A) or 1N5822 (40 V, 3 A). These minimize forward voltage drop and reverse recovery losses, directly improving efficiency and reducing thermal stress. Fast-recovery diodes like MUR420 are acceptable alternatives if Schottky parts are unavailable, though with ~2–3% lower efficiency.
Can the LM2576D2TR4-5G be used in a negative-output (buck-boost) configuration?
Yes - the LM2576D2TR4-5G can be configured as a positive-to-negative converter (inverting buck-boost) per Figure 1 in the datasheet. In this topology, Pin 2 (Output) becomes the negative output rail, Pin 3 (GND) serves as the system ground, and the inductor/diode/capacitor connections are rearranged. Output magnitude remains 5.0 V, but polarity is inverted relative to input ground.
What is the standby current consumption of the LM2576D2TR4-5G in shutdown mode?
In shutdown mode (ON/OFF pin ≥2.2 V), the LM2576D2TR4-5G draws 80 µA typical standby quiescent current at 25 °C, rising to 400 µA maximum over −40 °C to +125 °C. This ultra-low current enables battery-backed systems to maintain weeks of standby time - e.g., a 100 mAh coin cell could power 100 units for >50 days before depletion.
LM2576D2TR4-5G 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:
- 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
LM2576D2TR4-5G FAQ
1.How can I place an order for LM2576D2TR4-5G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2TR4-5G 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 LM2576D2TR4-5G reliable?
The price and inventory of LM2576D2TR4-5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2TR4-5G is usually 5 days.
3.What payment methods are accepted for LM2576D2TR4-5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2TR4-5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2TR4-5G?
LM2576D2TR4-5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2TR4-5G 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 LM2576D2TR4-5G?
For technical support, including LM2576D2TR4-5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2TR4-5G requirements.
6.How does Aetrix verify that LM2576D2TR4-5G is sourced from the original manufacturer or authorized distributors?
All LM2576D2TR4-5G 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 LM2576D2TR4-5G meets industry standards.
7.What is the process for return or replacement of LM2576D2TR4-5G?
All LM2576D2TR4-5G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2TR4-5G, 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 LM2576D2TR4-5G part is unused and in its original packaging.
Return procedure for LM2576D2TR4-5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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