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onsemi LM2576T-ADJG
- Part No.:
- LM2576T-ADJG
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-ADJG.pdf
- Description:
- IC REG BUCK ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,631
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Product details
Overview
LM2576T-ADJG 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 LM2576T-ADJG datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-220-5 (Case 314D) package with exposed heatsink pad tied to Pin 3 (GND), 80 µA standby current under TTL shutdown, fixed 52 kHz oscillator, and feedback reference voltage of 1.23 V ±2% over 0 °C to 125 °C.
Technical Context
The LM2576T-ADJG implements a voltage-mode controlled buck topology with an internal 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and 3.1 V internal regulator powering logic and gate drive. Its NPN-based output switch features 1.5 V typical saturation voltage and 4.2–6.9 A peak current limit, enabling robust operation up to 3.0 A DC load current.
Thermal protection activates at 150 °C junction temperature, and the oscillator frequency folds back to ~18 kHz during overload or short-circuit conditions-reducing average power dissipation by lowering minimum duty cycle to ~2%. The ON/OFF pin accepts TTL-compatible logic (VIL ≤ 1.0 V, VIH ≥ 2.2 V) for low-quiescent standby mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 3.0 A DC load capability-supports high-current rails without external pass devices. |
| Input Voltage Range | 7.0 V to 40 V-compatible with 12 V/24 V industrial buses and wide-range unregulated supplies. |
| Feedback Reference | 1.23 V ±2% (0 °C to 125 °C)-sets precise output via external resistor divider; enables 1.23–37 V programmable range. |
| Oscillator Frequency | 52 kHz fixed (±10% over full temp range)-enables use of low-cost, standard inductors with minimal EMI filtering. |
| Efficiency | 77% typical at 12 VIN/5 VOUT/3 A-significantly reduces thermal load vs. linear regulators, often eliminating heatsinks. |
| Standby Current | 80 µA typical at VON/OFF = 5 V-enables ultra-low-power shutdown in battery-backed or energy-sensitive systems. |
| Protection Features | Integrated thermal shutdown + cycle-by-cycle current limiting-prevents damage during fault conditions without external circuitry. |
Pinout & Package
LM2576T-ADJG uses the TO-220-5 package (Case 314D), with the heatsink surface electrically connected to Pin 3 (GND). This thermally enhanced metal-can package supports high-power dissipation in compact layouts and requires no isolation between heatsink and PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR input capacitor to suppress switching transients. |
| 2: Output | Emiter of internal NPN switch | Drives inductor; 1.5 V typical Vsat; PCB copper area must be minimized to reduce noise coupling into sensitive analog sections. |
| 3: GND | Circuit ground reference | Common return for input/output capacitors, feedback network, and heatsink; single-point grounding recommended for stability. |
| 4: Feedback | Error amplifier non-inverting input | Direct connection point for external R1/R2 divider; senses output voltage; high-impedance (25–200 nA bias current). |
| 5: ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator and drops quiescent current to 80 µA; open or logic-low enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.23 V to 37 V via two-resistor divider-supports custom rail generation without multiple fixed-voltage SKUs. |
| Fixed 52 kHz switching frequency | Enables predictable EMI spectrum and compatibility with off-the-shelf, optimized inductors from Pulse, Renco, and Schott. |
| Internal thermal shutdown | Activates at 150 °C junction temperature-protects against sustained overload or poor heatsinking without external sensors. |
| TTL shutdown capability | 80 µA standby current with logic-high ON/OFF signal-ideal for microcontroller-controlled power sequencing and sleep modes. |
| Current-limit protection | 4.2–7.5 A peak switch current limit-prevents destructive overcurrent during startup, short circuits, or transient loads. |
Applications
| Industrial PLC Power Supply | Embedded System Pre-Regulator |
|---|---|
|
Use Scenario: Provides stable 5 V or 12 V rail from 24 V DC field bus in programmable logic controllers with ambient temperatures up to 70 °C. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 3.0 A continuous current; handles wide input variation and load transients without dropout. Use Value: Eliminates need for external current-sense or thermal monitoring circuitry due to integrated protection and ±4% regulation across temperature. |
Use Scenario: Generates 3.3 V intermediate rail from 12 V system supply for microcontrollers and peripherals in networked edge devices. IC Role / Device Role / Timing Role: Efficient pre-regulator reducing heat before LDO post-regulation; operates at fixed 52 kHz for predictable filter design. Use Value: Achieves 77% efficiency at full load-cutting power loss by >60% versus linear solution-extending thermal margin and board lifetime. |
| Battery Charger Front-End | On-Card DC-DC Converter |
|
Use Scenario: Converts variable 9–36 V adapter or solar input to regulated 14.4 V charging voltage for sealed lead-acid batteries. IC Role / Device Role / Timing Role: Adjustable-output buck controller with programmable feedback; supports constant-voltage charge profile with thermal foldback. Use Value: Built-in 18 kHz oscillator foldback during overload prevents thermal runaway during battery short or deep discharge recovery. |
Use Scenario: Integrated power conversion on dense PCBs for IoT sensor nodes requiring 5 V or adjustable rails from USB or PoE-derived 12 V. IC Role / Device Role / Timing Role: Compact, heatsink-free DC-DC solution using TO-220-5 package with GND-connected tab for direct PCB thermal conduction. Use Value: Requires only four external components (inductor, diode, input/output caps)-reducing BOM count, layout area, and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-ADJ | Higher 150 kHz switching frequency; lower 1.5 A output current; different pinout (Pin 4 = GND, Pin 5 = Feedback). | Requires smaller inductor/capacitors but cannot replace LM2576T-ADJG without PCB redesign due to non-pin-compatible layout. | Select when board space is constrained and 1.5 A output suffices; avoid for drop-in replacement or 3 A load requirements. |
| MP1584EN-LF-Z | 1.5 MHz operation; 3 A rating; synchronous rectification; requires external compensation; no integrated thermal shutdown latch. | Better light-load efficiency and smaller magnetics, but demands careful loop compensation and external fault management. | Prefer for high-density, high-efficiency designs where layout flexibility and design resources allow tuning; not suitable for legacy LM2576 footprint reuse. |
Compared with LM2576T-ADJG, LM2596T-ADJ offers higher frequency but lower current and incompatible pinout, while MP1584EN-LF-Z provides synchronous efficiency gains at the cost of design complexity and missing integrated thermal latch-making LM2576T-ADJG optimal for robust, low-risk, medium-frequency industrial power stages.
Availability
LM2576T-ADJG is available at Aetrix Electronics and suitable for industrial PLCs, embedded system pre-regulators, battery charger front-ends, and on-card DC-DC converters requiring stable component supply, long-lifecycle support, and proven reliability in harsh environments.
Supply support for LM2576T-ADJG 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 specifically for cost-sensitive, high-reliability industrial and embedded power conversion-emphasizing minimal external components, rugged fault protection, and wide-input operation without complex compensation.
FAQ
What is the maximum input voltage rating for the LM2576T-ADJG?
The LM2576T-ADJG has a maximum supply voltage rating of 45 V, with recommended operating input range of 7.0 V to 40 V. Exceeding 45 V risks permanent damage per Absolute Maximum Ratings. For reliable long-term operation, input should remain ≤40 V under all conditions including transients and ripple.
Does the LM2576T-ADJG require an external catch diode, and what type is recommended?
Yes, the LM2576T-ADJG requires an external Schottky catch diode (e.g., MBR360 or 1N5822) connected between the Output pin and GND. The diode must support ≥3.0 A average current and ≥40 V reverse voltage. Schottky types are mandatory to minimize conduction loss and ensure stable operation at 52 kHz.
How is the output voltage set on the LM2576T-ADJG?
The LM2576T-ADJG output voltage is set using two external resistors (R1 and R2) forming a voltage divider from VOUT to GND, with the midpoint connected to the Feedback pin. The formula is VOUT = 1.23 V × (1 + R2/R1), where R1 is typically 1.0–5.0 kΩ and both resistors should be 1% metal film for stability.
What thermal performance can be expected from the LM2576T-ADJG in a TO-220-5 package?
In the TO-220-5 (Case 314D) package, the LM2576T-ADJG has a junction-to-case thermal resistance of 5.0 °C/W and junction-to-ambient of 65 °C/W with standard PCB mounting. With a modest heatsink, it sustains 3.0 A continuous output at 12 VIN/5 VOUT up to +70 °C ambient without derating.
Is the LM2576T-ADJG pin-compatible with other LM2576 variants like LM2576-5G?
Yes, all LM2576 variants-including LM2576T-ADJG, LM2576-5G, and LM2576-12G-share identical TO-220-5 (Case 314D) pinout and mechanical footprint. Only the feedback network differs: fixed versions internally connect the divider, while LM2576T-ADJG leaves Pin 4 (Feedback) open for external programming.
LM2576T-ADJG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2576T-ADJG FAQ
1.How can I place an order for LM2576T-ADJG through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-ADJG 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 LM2576T-ADJG reliable?
The price and inventory of LM2576T-ADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-ADJG is usually 5 days.
3.What payment methods are accepted for LM2576T-ADJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-ADJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-ADJG?
LM2576T-ADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-ADJG 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 LM2576T-ADJG?
For technical support, including LM2576T-ADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-ADJG requirements.
6.How does Aetrix verify that LM2576T-ADJG is sourced from the original manufacturer or authorized distributors?
All LM2576T-ADJG 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 LM2576T-ADJG meets industry standards.
7.What is the process for return or replacement of LM2576T-ADJG?
All LM2576T-ADJG units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-ADJG, 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 LM2576T-ADJG part is unused and in its original packaging.
Return procedure for LM2576T-ADJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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