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onsemi LM2576TV-ADJ
- Part No.:
- LM2576TV-ADJ
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576TV-ADJ.pdf
- Description:
- IC REG BUCK ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,636
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Product details
Overview
LM2576TV-ADJ from onsemi is a monolithic 3.0 A step-down (buck) switching regulator IC with adjustable output voltage (1.23 V to 37 V), 52 kHz fixed-frequency internal oscillator, and integrated 3.0 A NPN switch. It delivers high efficiency (>77% at 12 VIN/5 VOUT/3 A), features thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - ideal for compact, high-efficiency DC-DC conversion in industrial power supplies.
For engineers reviewing the LM2576TV-ADJ datasheet, pinout, applications, or equivalent options, key selection criteria include output adjustability range, guaranteed 3.0 A load capability, TO-220 package thermal performance (RθJC = 5.0 °C/W), and compatibility with standard off-the-shelf inductors (e.g., Pulse PE-92108).
Technical Context
The LM2576TV-ADJ implements a voltage-mode controlled buck topology with a built-in 1.23 V bandgap reference, error amplifier, 52 kHz oscillator, and NPN power switch. Feedback is applied directly to Pin 4, enabling precise output regulation via external resistor divider (R1/R2), with ±4% output tolerance over line/load/temperature.
It operates across 7.0 V–40 V input, supports shutdown via logic-level ON/OFF pin (threshold ~1.4 V), and includes self-protective features: current limit (4.2–7.5 A peak), thermal shutdown, and frequency foldback (to ~18 kHz) under overload - all without requiring external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 3.0 A continuous load current - enables single-chip replacement of linear regulators in medium-power applications. |
| Output Voltage Range | Adjustable 1.23 V to 37 V (±4% tolerance) - set by external R1/R2; supports wide-range system rail generation. |
| Input Voltage Range | 7.0 V to 40 V DC - accommodates 12 V/24 V industrial buses and unregulated AC-DC outputs. |
| Oscillator Frequency | 52 kHz (±10% over 0–125 °C) - fixed frequency simplifies EMI filtering and inductor selection. |
| Efficiency | 77% typical at 12 VIN, 5 VOUT, 3 A load - reduces heat dissipation vs. linear regulators, often eliminating heatsink need. |
| Thermal Resistance | RθJC = 5.0 °C/W (TO-220 case 314B) - enables direct heatsink mounting on Pin 3 (GND) for high-power operation. |
| Shutdown Current | 80 µA typical standby current (ON/OFF pin = 5 V) - suitable for low-power sleep modes in battery-backed systems. |
Pinout & Package
LM2576TV-ADJ uses the TO-220-5 (Case 314B) package with heatsink surface electrically connected to Pin 3 (GND). The package is Pb-free and 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 input capacitor to suppress switching transients. |
| 2 - Output | Emiter of internal NPN switch | Drives inductor; saturation voltage ≤2.0 V ensures low conduction loss; PCB copper area must be minimized to reduce noise coupling. |
| 3 - GND | Circuit ground / heatsink connection | Common return path and thermal interface; must be connected to large copper plane or external heatsink for thermal management. |
| 4 - Feedback | Error amplifier non-inverting input | Direct connection point for R1/R2 voltage divider; sensitive node - keep traces short and away from noisy signals. |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible input; ≥2.4 V (typ.) disables regulator (80 µA IQ); ≤1.0 V (typ.) enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.0 A NPN switch | Eliminates external transistor and driver, reducing BOM count and layout complexity in buck designs. |
| Fixed 52 kHz switching frequency | Enables predictable EMI profile and use of standardized, low-cost inductors (e.g., Pulse PE-92108, 100 µH). |
| Adjustable output (1.23–37 V) | Single part number supports multiple output rails via resistor programming - improves inventory flexibility. |
| Thermal shutdown + current limit | Provides autonomous fault protection without external circuitry - critical for reliable operation in unattended systems. |
| TTL shutdown with 80 µA standby | Allows microcontroller-based power sequencing and ultra-low quiescent current in sleep states. |
Applications
| Industrial Power Supply | Embedded System Rail Generator |
|---|---|
Use Scenario: Converting 24 V DC bus to 5 V/3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role: Primary step-down regulator delivering stable, high-current output with minimal external components. Use Value: Replaces inefficient linear regulators, cutting board-level heat by >60% and enabling fanless enclosure design. | Use Scenario: Generating configurable 3.3 V–12 V rails for FPGA, MCU, and peripheral ICs on a single-board computer. IC Role / Device Role: Adjustable buck controller providing flexible, programmable voltage domains from one input source. Use Value: Enables hardware reconfiguration via resistor change - no PCB revision needed for different voltage requirements. |
| Battery Charger Pre-regulator | On-Card Switching Supply |
Use Scenario: Stepping down 36 V lithium battery pack voltage to 15 V for constant-current charging circuitry. IC Role / Device Role: Efficient pre-regulator stage before linear charger IC, reducing thermal stress on downstream components. Use Value: Maintains >88% efficiency at 15 V output, minimizing energy loss during extended charge cycles. | Use Scenario: Local 5 V supply on a motor drive control board where space and thermal constraints prohibit external DC-DC modules. IC Role / Device Role: Compact, self-contained buck converter mounted directly on the main PCB. Use Value: TO-220 package allows direct heatsink attachment - achieves full 3 A output in < 1.5 in² board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-ADJ | Same electrical specs; TO-220-5 package but Case 314D (no heatsink tab on Pin 3) | Limited thermal performance in high-ambient or continuous 3 A operation due to higher RθJA (65 °C/W vs. 65 °C/W, but no direct heatsink path) | Select LM2576TV-ADJ when heatsinking is required; LM2576T-ADJ only if ambient temperature remains < 50 °C and load is intermittent. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller external components, but lower max output current (3 A typical, derated above 85 °C) | Better suited for space-constrained designs; less suitable for high-temperature industrial enclosures due to tighter thermal limits | Choose MP1584EN-LF-Z for compact consumer-grade boards; LM2576TV-ADJ remains preferred for ruggedized 3 A industrial power rails. |
Compared with LM2576T-ADJ, LM2576TV-ADJ provides superior thermal management via heatsink-connected Pin 3, while MP1584EN-LF-Z trades thermal robustness for size reduction - making LM2576TV-ADJ the optimal choice for sustained 3 A loads in demanding environments.
Availability
LM2576TV-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rail generation, and battery charger pre-regulators requiring stable component supply and long-term manufacturability.
Supply support for LM2576TV-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 focused on energy-efficient power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was designed specifically for cost-sensitive, high-reliability industrial and embedded DC-DC conversion - emphasizing simplicity (4 external components), ruggedness (thermal/current protection), and compatibility with standard magnetics.
FAQ
What is the maximum input voltage rating for LM2576TV-ADJ?
The absolute maximum input voltage for LM2576TV-ADJ is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Exceeding 40 V may trigger internal protection or reduce reliability - always maintain ≥1 V margin below 45 V in design. LM2576TV-ADJ is validated for stable operation from 7.0 V to 40 V input across its full temperature range.
How do I calculate the feedback resistors for a target output voltage with LM2576TV-ADJ?
Use the formula VOUT = 1.23 V × (1 + R2/R1), where R1 is typically 1.0 kΩ–5.0 kΩ (1% metal film recommended). For example, to set 12 V output: R2 = R1 × (12/1.23 − 1) ≈ R1 × 8.75. With R1 = 1.2 kΩ, R2 = 10.5 kΩ (use 10.5 kΩ or nearest standard value). LM2576TV-ADJ's feedback pin draws only 25–200 nA, so resistor values up to 100 kΩ maintain accuracy.
Does LM2576TV-ADJ require an external diode, and what type is recommended?
Yes, LM2576TV-ADJ requires an external Schottky catch diode (D1) connected between Pin 2 (Output) and GND. Recommended parts include MBR360 (40 V, 3 A) or 1N5822 - both listed in the official datasheet. The diode must handle ≥1.2× load current and ≥1.25× max input voltage; reverse recovery time and forward voltage directly impact efficiency and thermal performance of LM2576TV-ADJ.
Can LM2576TV-ADJ be used in a negative-output (buck-boost) configuration?
Yes - the LM2576TV-ADJ datasheet explicitly lists "Positive to Negative Converter (Buck-Boost)" as an application. In this topology, the IC regulates the magnitude of a negative output referenced to system ground, using inverted inductor/diode placement. LM2576TV-ADJ's internal architecture supports this mode, but feedback network polarity and component stress (especially diode reverse voltage) must be carefully evaluated per Figure 1 application note.
What is the thermal performance difference between LM2576TV-ADJ and LM2576T-ADJ?
LM2576TV-ADJ (Case 314B) has its heatsink surface electrically tied to Pin 3 (GND), enabling direct mechanical and thermal attachment to an external heatsink - achieving RθJC = 5.0 °C/W. LM2576T-ADJ (Case 314D) lacks this feature, relying solely on PCB conduction and ambient convection (RθJA = 65 °C/W). This makes LM2576TV-ADJ significantly more capable for continuous 3 A operation at elevated ambient temperatures.
LM2576TV-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2576TV-ADJ FAQ
1.How can I place an order for LM2576TV-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576TV-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 LM2576TV-ADJ reliable?
The price and inventory of LM2576TV-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576TV-ADJ is usually 5 days.
3.What payment methods are accepted for LM2576TV-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576TV-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576TV-ADJ?
LM2576TV-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576TV-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 LM2576TV-ADJ?
For technical support, including LM2576TV-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576TV-ADJ requirements.
6.How does Aetrix verify that LM2576TV-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2576TV-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 LM2576TV-ADJ meets industry standards.
7.What is the process for return or replacement of LM2576TV-ADJ?
All LM2576TV-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2576TV-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 LM2576TV-ADJ part is unused and in its original packaging.
Return procedure for LM2576TV-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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