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onsemi LM2576D2T-ADJ
- Part No.:
- LM2576D2T-ADJ
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576D2T-ADJ.pdf
- Description:
- IC REG BUCK ADJ 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,723
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Product details
Overview
LM2576D2T-ADJ from onsemi is a monolithic 3.0 A, 52 kHz step-down (buck) switching regulator IC with adjustable output voltage (1.23 V to 37 V), ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It operates from 7.0 V to 40 V input and delivers high efficiency-up to 77% at 12 VIN/5 VOUT/3 A-enabling compact, heatsink-free power supplies in industrial control and embedded systems.
For engineers reviewing the LM2576D2T-ADJ datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed package mapping to D2PAK (Case 936A), real-world design meaning of key specs, and two rigorously cross-checked alternative parts for adjustable-buck regulator selection.
Technical Context
The LM2576D2T-ADJ implements a fixed-frequency (52 kHz nominal) voltage-mode PWM buck controller with an internal 1.23 V bandgap reference, error amplifier, and 3.0 A NPN switch. Its feedback pin (Pin 4) directly interfaces with external resistor dividers to set output voltage, eliminating internal divider dependency.
Protection architecture includes cycle-by-cycle peak-current limiting (typ. 5.8 A at 25 °C), thermal shutdown at ~150 °C junction temperature, and TTL-compatible ON/OFF control (1.4 V threshold) enabling low-quiescent standby mode (80 µA typical). The device uses standard external components: Schottky catch diode, 100 µH inductor, and aluminum electrolytic input/output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 3.0 A continuous load current-supports single-rail power for microcontrollers, sensors, and logic without derating at 25 °C ambient. |
| Input Voltage Range | 7.0 V to 40 V DC-enables direct operation from 12 V/24 V industrial buses or unregulated wall adapters without pre-regulation. |
| Output Voltage Range | Adjustable 1.23 V to 37 V via external resistors-covers 3.3 V, 5 V, 12 V, 15 V, and custom rails using only R1/R2 (R1 = 1–5 kΩ). |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0 °C to 125 °C)-fixed frequency simplifies EMI filtering and enables use of low-cost, standardized inductors. |
| Feedback Reference | 1.23 V ±2.2% (−40 °C to +125 °C)-tight reference tolerance ensures stable output regulation across automotive and industrial temperature ranges. |
| Standby Quiescent Current | 80 µA typical at 25 °C when ON/OFF pin ≥2.2 V-enables ultra-low-power shutdown in battery-backed or energy-conscious systems. |
| Thermal Resistance | Junction-to-case 5.0 °C/W (D2PAK)-permits direct heatsink mounting to Pin 3 (GND) for high-power operation without PCB copper pour. |
Pinout & Package
D2PAK (TO-263) package, Case 936A, with heatsink surface electrically connected to Pin 3 (GND). Requires minimum 10 mm² exposed copper pad under package for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF/75 V aluminum electrolytic bypass capacitor to suppress switching transients. |
| 2 - Output | Emiter of internal NPN switch | Saturation voltage ≤1.8 V at 3 A-dictates minimum dropout and conduction loss; PCB trace area must be minimized to reduce EMI coupling. |
| 3 - GND | Circuit ground and thermal pad | Common return for all signals and primary thermal path; heatsink surface is electrically tied to this pin-must be soldered to large copper plane. |
| 4 - Feedback | Error amplifier non-inverting input | Direct connection point for external R1/R2 divider; high-impedance (≤200 nA bias current) enables precise output programming without loading. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high ≥2.2 V disables regulator (80 µA standby); open or logic-low ≤1.0 V enables operation-compatible with MCU GPIO without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated protection | Thermal shutdown + cycle-by-cycle current limiting-eliminates need for external fault-handling circuitry in overload or short-circuit conditions. |
| Low-component count | Only 4 external parts required (diode, inductor, input/output caps)-reduces BOM cost, board space, and design validation effort. |
| Standard inductor compatibility | Optimized for 100 µH pulse inductors (e.g., Pulse PE-92108)-enables sourcing from multiple vendors without custom magnetics. |
| Moisture Sensitivity Level | MSL 1 (unlimited floor life)-no baking required before reflow, simplifying manufacturing and inventory handling. |
| Pb-Free packaging | RoHS-compliant D2PAK (936A) leadframe-meets global environmental regulations without performance trade-offs. |
Applications
| Industrial PLC Power Supply | Embedded System Pre-Regulator |
|---|---|
|
Use Scenario: Providing clean 5 V/3 A rail from noisy 24 V DC field bus in programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated output; fixed 52 kHz switching enables predictable EMI filter design. Use Value: High efficiency (≥77%) minimizes heat rise in sealed enclosures; thermal shutdown prevents damage during field wiring faults. |
Use Scenario: Generating 3.3 V for ARM Cortex-M microcontrollers from a 12 V system rail in medical IoT devices. IC Role / Device Role / Timing Role: Intermediate step-down stage preceding LDO post-regulation; adjustable output supports multiple SoC variants. Use Value: ±4% output tolerance ensures reliable boot at cold temperatures; 80 µA standby current extends battery life in sleep modes. |
| Automotive Body Control Module | Test Equipment Auxiliary Supply |
|
Use Scenario: Powering CAN transceivers and sensors from 12 V battery with load dump immunity up to 40 V. IC Role / Device Role / Timing Role: Input-stage buck regulator handling wide-input transients; ON/OFF pin synchronized to vehicle ignition state. Use Value: 40 V max input withstands ISO 7637-2 pulse 5a; −40 °C to +125 °C operating range meets AEC-Q100 Grade 2 requirements. |
Use Scenario: Delivering stable 15 V/2 A output for analog front-end circuits in portable benchtop test instruments. IC Role / Device Role / Timing Role: Main DC-DC converter in self-contained power subsystem; feedback loop designed for <1% ripple at full load. Use Value: 1.23 V reference stability ensures accurate voltage setting across temperature; D2PAK thermal pad enables forced-air cooling in compact chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ | Higher 63 kHz switching frequency; lower 1.23 V reference drift (±1.5%); 1.5 A output current rating. | Better suited for space-constrained designs needing smaller inductors; insufficient for >1.5 A loads requiring LM2576D2T-ADJ's 3 A capability. | Select LM2576D2T-ADJ when 3 A continuous output, proven industrial reliability, or legacy design continuity is required. |
| MP1584EN-LF-Z | 42 V input, 3 A output, 1.8 MHz switching; requires external compensation; no integrated thermal pad. | Enables ultra-compact layouts with ceramic capacitors but demands careful loop stability analysis; lacks D2PAK thermal robustness for high-ambient environments. | Choose LM2576D2T-ADJ for simplified thermal management, minimal external parts, and ruggedized industrial deployment. |
Compared with LM2596S-ADJ and MP1584EN-LF-Z, the LM2576D2T-ADJ offers superior thermal handling via its D2PAK heatsink pad, guaranteed 3 A output without derating, and zero-compensation fixed-frequency operation-making it optimal for cost-sensitive, thermally demanding, or long-lifecycle industrial power supplies.
Availability
LM2576D2T-ADJ is available at Aetrix Electronics and suitable for industrial PLCs, embedded medical devices, automotive body controllers, and test equipment requiring stable component supply with full lifecycle support.
Supply support for LM2576D2T-ADJ 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was engineered for robust, low-component-count DC-DC conversion in harsh environments-prioritizing thermal resilience, wide-input operation, and protection integration over high-frequency miniaturization.
FAQ
What is the maximum input voltage rating for the LM2576D2T-ADJ?
The LM2576D2T-ADJ has an absolute maximum input voltage rating of 45 V, with recommended continuous operation up to 40 V. This allows safe use with 24 V industrial buses subject to load-dump transients, provided external input protection (e.g., TVS diode) is implemented per IEC 61000-4-5 guidelines. Exceeding 45 V risks permanent damage to the internal switch.
How do I calculate the output voltage for the LM2576D2T-ADJ?
The LM2576D2T-ADJ output voltage is set by two external resistors: VOUT = 1.23 V × (1 + R2/R1), where R1 connects from Feedback (Pin 4) to GND and R2 connects from Output (Pin 2) to Feedback (Pin 4). R1 should be 1.0–5.0 kΩ (1% metal film recommended); for example, R1 = 1.2 kΩ and R2 = 3.92 kΩ yields 5.0 V output. The LM2576D2T-ADJ datasheet Figure 15 shows exact layout guidance.
Does the LM2576D2T-ADJ require a heatsink in typical operation?
The LM2576D2T-ADJ can operate without an external heatsink at ≤1.5 A load with 12 V input and 5 V output in still air, due to its 5.0 °C/W junction-to-case thermal resistance and D2PAK thermal pad. At full 3 A load or higher ambient temperatures (>50 °C), a heatsink attached to Pin 3 (GND) is strongly recommended-onsemi's Application Note AN-1178 provides validated thermal design examples for the LM2576D2T-ADJ.
What type of catch diode is recommended for the LM2576D2T-ADJ?
A Schottky diode rated ≥3.0 A average current and ≥40 V reverse voltage is required for the LM2576D2T-ADJ, such as MBR360 (40 V, 3 A) or SR304 (40 V, 3 A). Fast-recovery diodes like MUR420 are acceptable but less efficient. The diode must be mounted close to Pins 2 and 3 to minimize parasitic inductance-critical for stable operation of the LM2576D2T-ADJ.
Is the LM2576D2T-ADJ pin-compatible with other LM2576 variants?
Yes-the LM2576D2T-ADJ shares identical pinout (Vin, Output, GND, Feedback, ON/OFF) and D2PAK package (Case 936A) with all LM2576 fixed-output versions (e.g., LM2576D2T-5.0). This allows direct substitution in adjustable designs and reuse of PCB footprints, though feedback network values must be updated to match the target output voltage for each LM2576D2T-ADJ implementation.
LM2576D2T-ADJ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- 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-ADJ FAQ
1.How can I place an order for LM2576D2T-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576D2T-ADJ 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-ADJ reliable?
The price and inventory of LM2576D2T-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576D2T-ADJ is usually 5 days.
3.What payment methods are accepted for LM2576D2T-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576D2T-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576D2T-ADJ?
LM2576D2T-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576D2T-ADJ 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-ADJ?
For technical support, including LM2576D2T-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576D2T-ADJ requirements.
6.How does Aetrix verify that LM2576D2T-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2576D2T-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LM2576D2T-ADJ?
All LM2576D2T-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2576D2T-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LM2576D2T-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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