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onsemi LM2576D2TR4-3.3G
- Part No.:
- LM2576D2TR4-3.3G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2TR4-3.3G.pdf
- Description:
- IC REG BUCK 3.3V 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:471
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Product details
Overview
LM2576D2TR4-3.3G from onsemi is a monolithic 3.0 A, 52 kHz fixed-frequency step-down (buck) switching regulator with fixed 3.3 V output, designed for high-efficiency DC-DC conversion in industrial and embedded power supplies. It operates from 7.0 V to 40 V input, delivers ±4% output voltage tolerance over line/load/temperature, and integrates thermal shutdown and cycle-by-cycle current limiting. Used in on-card power rails requiring compact, heatsink-free operation.
For engineers reviewing the LM2576D2TR4-3.3G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 52 kHz oscillator frequency, ON/OFF logic control with 80 µA standby current, and D2PAK (TO-263) package thermal performance with RJC = 5.0 °C/W.
Technical Context
The LM2576D2TR4-3.3G implements a voltage-mode controlled buck topology with internal 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and 1.0 A NPN switch driver. Its feedback loop senses output voltage directly at Pin 4 for fixed-output variants, eliminating external resistor networks.
Protection architecture includes cycle-by-cycle peak current limiting (typ. 5.8 A at 25 °C), thermal shutdown activation at TJ ≥ 150 °C, and TTL-compatible ON/OFF control (VIL ≤ 1.2 V, VIH ≥ 2.2 V) enabling low-power standby mode with 80 µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over −40 °C to +125 °C, 6.0–40 V input, 0.5–3.0 A load - ensures stable logic rail supply without trimming. |
| Max Output Current | Guaranteed 3.0 A continuous - supports mid-power microcontrollers, FPGAs, and interface ICs without external current boosting. |
| Oscillator Frequency | 52 kHz (±10% over temp) - enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., 100 µH Pulse PE-92108). |
| Input Voltage Range | 7.0 V to 40 V - accommodates 12 V/24 V industrial buses and automotive battery variations with dropout headroom. |
| Efficiency | 75% at 12 VIN, 3.0 AOUT - reduces thermal load vs. linear regulators, often eliminating heatsinks in <10 W applications. |
| Standby Current | 80 µA typical at VON/OFF = 5 V - enables ultra-low-power system sleep modes without auxiliary LDOs. |
| Thermal Resistance | RJC = 5.0 °C/W - allows direct heatsink mounting to Pin 3 (GND) for reliable 3 A operation up to +125 °C ambient. |
Pinout & Package
D2PAK (TO-263-5) package with exposed thermal pad (terminal 6) electrically connected to Pin 3 (GND); requires soldered thermal land for rated current operation.
| 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. |
| 2: Output | Emitter of internal NPN switch | Drives inductor; saturation voltage ≤1.8 V at 3 A - contributes to conduction loss and must be routed with minimal copper area to reduce EMI coupling. |
| 3: GND | Circuit ground and thermal path | Common return for all signals; exposed thermal pad (terminal 6) connects here - mandatory for thermal performance and current rating. |
| 4: Feedback | Regulated output voltage sense | Internally referenced to 1.235 V; for fixed 3.3 V version, tied internally - no external resistors required. |
| 5: ON/OFF | Logic-controlled enable/disable | TTL-compatible input; ≤1.2 V = active, ≥2.2 V = shutdown - pulls total input current to 80 µA in off state. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated protection | Thermal shutdown + cycle-by-cycle current limit - eliminates need for external fault-handling circuitry in board-level designs. |
| Low-component count | Only 4 external parts required (inductor, catch diode, input/output capacitors) - accelerates power supply layout and reduces BOM cost. |
| Standard inductor compatibility | Optimized for 52 kHz operation with widely available 100 µH pulse inductors - avoids custom magnetics and simplifies sourcing. |
| Pb-free packaging | D2PAK (Case 936A) with MSL Level 1 - supports lead-free reflow assembly without moisture sensitivity concerns. |
| High efficiency at full load | 75% efficiency at 12 VIN/3.3 VOUT/3 A - cuts power dissipation by >50% versus equivalent linear regulators, easing thermal management. |
Applications
| Industrial PLC I/O Module Power | Embedded Microcontroller Core Supply |
|---|---|
Use Scenario: Providing isolated 3.3 V rail for digital I/O conditioning circuits in programmable logic controllers operating from 24 V DC field bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V bus to clean 3.3 V logic supply with ripple <100 mVPP. Use Value: Eliminates need for secondary linear post-regulator; 75% efficiency prevents thermal derating in sealed enclosures. | Use Scenario: Generating core voltage for ARM Cortex-M4 microcontrollers in battery-backed data loggers with wide-input 9–36 V DC input. IC Role / Device Role / Timing Role: Main DC-DC converter delivering 3.0 A peak current during CPU burst operations. Use Value: 80 µA standby current extends battery life in sleep mode; 52 kHz switching avoids audible noise in sensitive instrumentation. |
| Automotive Body Control Unit | Point-of-Load for FPGA Config Memory |
Use Scenario: Powering CAN transceivers and sensor interfaces in vehicle body control modules subjected to cold-crank (6.0 V) and load-dump (40 V) conditions. IC Role / Device Role / Timing Role: Input-stage buck regulator handling 7–40 V transients while maintaining regulated 3.3 V output. Use Value: Wide input range and ±4% output tolerance ensure reliable operation across automotive voltage extremes without additional supervision. | Use Scenario: Supplying configuration memory (e.g., SPI Flash) and I/O banks for Xilinx Artix-7 FPGAs in test equipment with 12 V system rail. IC Role / Device Role / Timing Role: Dedicated 3.3 V point-of-load regulator decoupled from main system rail. Use Value: D2PAK thermal performance enables 3 A delivery in dense layouts; fixed output removes resistor placement errors in high-reliability systems. |
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-220-5 package (Case 314B/D); higher RJA = 65 °C/W; same electrical specs. | Suitable for lower-power or heatsink-equipped designs where PCB space permits larger through-hole footprint. | Select when mechanical constraints favor TO-220 mounting or when legacy board designs require pin-compatible replacement. |
| MP1584EN-LF-Z | 3 A, 1.5 MHz synchronous buck; smaller solution size; requires external compensation; no integrated catch diode. | Better suited for space-constrained portable devices; not drop-in due to different pinout, frequency, and control scheme. | Choose for new designs prioritizing footprint reduction and higher efficiency above 1 A, accepting added design complexity. |
Compared with LM2576T-3.3, the LM2576D2TR4-3.3G offers superior thermal performance in surface-mount layouts; compared with MP1584EN-LF-Z, it provides simpler implementation with fewer external components but at larger size and lower switching frequency.
Availability
LM2576D2TR4-3.3G is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded microcontroller core rails, and automotive body control units requiring stable component supply and long-term manufacturability.
Supply support for LM2576D2TR4-3.3G 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, high-reliability industrial and embedded power conversion - emphasizing ease of use, thermal resilience, and broad input voltage tolerance.
FAQ
What is the maximum input voltage rating for the LM2576D2TR4-3.3G?
The LM2576D2TR4-3.3G 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 per the Absolute Maximum Ratings table. For sustained reliability in automotive or industrial environments, design margins should keep transient inputs below 40 V, especially during load dump events.
Does the LM2576D2TR4-3.3G require an external feedback resistor network?
No, the LM2576D2TR4-3.3G is a fixed-output variant with internal resistor divider set to 3.3 V. Pin 4 (Feedback) is internally connected and requires no external components - unlike the adjustable LM2576-ADJ version, which mandates R1/R2 programming resistors.
What thermal management is required for full 3.0 A operation of the LM2576D2TR4-3.3G?
Full 3.0 A operation requires soldering the exposed thermal pad (terminal 6) to a minimum 1.5 cm² copper pour connected to Pin 3 (GND). With this, junction-to-ambient thermal resistance is 70 °C/W. At 12 VIN/3.3 VOUT, power dissipation is ~26 W; ambient temperature must stay ≤65 °C to maintain TJ < 150 °C.
Can the LM2576D2TR4-3.3G be used in a negative-output (buck-boost) configuration?
Yes - the LM2576D2TR4-3.3G datasheet explicitly lists "Positive to Negative Converter (Buck-Boost)" under Applications. When configured as an inverting buck-boost, it generates a regulated −3.3 V output from a positive input, using Pin 2 as switch emitter and Pin 3 as return. Layout must follow Figure 1 guidelines for stability.
What is the purpose of the ON/OFF pin (Pin 5) on the LM2576D2TR4-3.3G?
The ON/OFF pin enables logic-controlled shutdown: ≤1.2 V activates regulation; ≥2.2 V disables the internal switch and reduces total input current to 80 µA typical. This feature supports system-level power sequencing and ultra-low-power sleep modes without removing input voltage.
LM2576D2TR4-3.3G 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:
- Last Time Buy
- 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
LM2576D2TR4-3.3G FAQ
1.How can I place an order for LM2576D2TR4-3.3G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2TR4-3.3G 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 LM2576D2TR4-3.3G reliable?
The price and inventory of LM2576D2TR4-3.3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2TR4-3.3G is usually 5 days.
3.What payment methods are accepted for LM2576D2TR4-3.3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2TR4-3.3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2TR4-3.3G?
LM2576D2TR4-3.3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2TR4-3.3G 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 LM2576D2TR4-3.3G?
For technical support, including LM2576D2TR4-3.3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2TR4-3.3G requirements.
6.How does Aetrix verify that LM2576D2TR4-3.3G is sourced from the original manufacturer or authorized distributors?
All LM2576D2TR4-3.3G 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 LM2576D2TR4-3.3G meets industry standards.
7.What is the process for return or replacement of LM2576D2TR4-3.3G?
All LM2576D2TR4-3.3G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2TR4-3.3G, 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 LM2576D2TR4-3.3G part is unused and in its original packaging.
Return procedure for LM2576D2TR4-3.3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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