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Texas Instruments LM2576T-12/NOPB
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- Part No.:
- LM2576T-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:620
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Product details
Overview
LM2576T-12/NOPB from Texas Instruments is a monolithic 3-A non-synchronous step-down (buck) DC-DC voltage regulator in TO-220-5 package, delivering fixed 12 V output with ±4% tolerance over line and load, 52-kHz fixed-frequency operation, and TTL-compatible ON/OFF control. It replaces linear regulators in medium-power industrial power supplies where thermal efficiency and minimal external component count are critical.
For engineers reviewing the LM2576T-12/NOPB datasheet, LM2576T-12/NOPB pinout, LM2576T-12/NOPB application, or LM2576T-12/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details for production deployment.
Technical Context
The LM2576T-12/NOPB integrates a 3-A NPN switch, fixed 52-kHz oscillator, error amplifier with 1.23-V internal reference, cycle-by-cycle current limiting, and thermal shutdown. Its non-synchronous architecture uses an external catch diode, requiring no bootstrap capacitor but imposing duty-cycle limits based on input-output voltage ratio.
It operates in continuous conduction mode under full 3-A load at typical input voltages (e.g., 25 V), with dropout voltage of ~2 V at 3 A and peak switch saturation voltage of 1.8 V (typ). Shutdown mode draws only 50 μA standby current via the ON/OFF pin, enabling low-power system-level control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full operating temperature (−40°C to +125°C) and load (0.5–3 A); eliminates need for external feedback divider. |
| Max Input Voltage | 40 V - defines absolute maximum DC input; requires derating above 30 V for thermal reliability in TO-220 package. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, high-current through-hole inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Output Current | 3 A DC - sustained load capability with proper heatsinking; limited by junction temperature (150°C max) and PCB copper area. |
| Efficiency | 88% at VIN = 15 V, IOUT = 3 A - reduces heat sink size versus linear regulators; efficiency drops below 75% at VIN < 18 V due to fixed dropout. |
| Standby Current | 50 μA (typ) at ON/OFF = HIGH - enables microcontroller-controlled power sequencing without significant battery drain. |
| Thermal Resistance | RθJA = 32.4°C/W (TO-220) - requires ≥2 in² copper pour and mechanical heatsink for 3-A continuous operation at 70°C ambient. |
Pinout & Package
LM2576T-12/NOPB uses KC (TO-220-5) package with 10.16 mm × 8.51 mm body size and integral GND-connected metal tab for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Connects directly to collector of internal NPN switch; must be decoupled with ≥100 μF electrolytic capacitor placed <5 mm from pin to minimize switching noise injection. |
| 2 - OUTPUT | Switching node | Emitter of internal NPN switch; connects to inductor and cathode of external Schottky diode; high dv/dt node requiring tight layout and ground plane separation. |
| 3 - GROUND | Power and signal reference | Common return for input/output capacitors and feedback network; shortest possible path to CIN and COUT grounds required for stability. |
| 4 - FEEDBACK | Regulation sense input | Internally connected to 12-V output; shorted to output capacitor for fixed-version operation; unused in LM2576T-12/NOPB (not adjustable). |
| 5 - ON/OFF | Enable/disable control | TTL-compatible logic input: ≤1.2 V = active, ≥2.2 V = shutdown; 50-μA standby current when HIGH; must not float-tie to GND for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external resistor divider, reducing BOM count and improving long-term output accuracy vs. adjustable variants. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI spectrum placement and simplifies filter design using standard off-the-shelf inductors rated for ≤100 kHz. |
| Cycle-by-cycle current limiting | Protects internal switch during overload or short-circuit events without latch-up; allows automatic recovery after fault removal. |
| TTL shutdown with 50-μA standby | Supports low-power system sleep modes; compatible with 3.3-V and 5-V logic without level-shifting circuitry. |
| Thermal shutdown protection | Halts switching when junction temperature exceeds ~150°C; prevents permanent damage during transient overloads or inadequate heatsinking. |
Applications
| Industrial Motor Drives | Network Equipment Power Supplies |
|---|---|
|
Use Scenario: Powering gate drivers and logic circuits in 24-V DC motor controllers with intermittent 3-A peak loads. IC Role / Device Role / Timing Role: Primary 12-V buck regulator supplying isolated gate driver ICs and microcontroller peripherals. Use Value: Delivers stable 12 V at 3 A with <2% line regulation across 18–36-V input range, eliminating need for post-regulation LDOs. |
Use Scenario: Generating 12-V bias rails for PoE midspans and Ethernet switches operating in 0–70°C ambient. IC Role / Device Role / Timing Role: Secondary-side DC-DC converter converting 48-V PoE-derived bus to 12 V for fan controllers and PHY interfaces. Use Value: Achieves 88% efficiency at full load, reducing thermal stress in compact chassis; TO-220 package allows direct heatsink mounting. |
| Appliance Control Boards | Test Equipment Power Modules |
|
Use Scenario: Providing regulated 12-V supply for MCU, display backlight, and sensor interfaces in smart home appliances. IC Role / Device Role / Timing Role: Main system power regulator accepting wide-input unregulated DC from AC/DC front-end. Use Value: Withstands 40-V transients from relay coil flyback; ±4% output tolerance ensures reliable operation of 12-V solenoids and relays. |
Use Scenario: Building bench-top programmable power modules requiring stable 12-V/3-A output with manual ON/OFF control. IC Role / Device Role / Timing Role: Core switching regulator in modular lab supply design with front-panel enable switch. Use Value: TTL ON/OFF pin enables simple SPST switch interface; 52-kHz frequency avoids audible noise in sensitive measurement environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVT-12/NOPB | 60-V max input (vs. 40 V), same pinout and 12-V output; higher RDS(on) increases dropout voltage at high current. | Suitable for automotive or industrial systems with >40-V transients (e.g., 48-V battery systems with load dump). | Select when input can exceed 40 V; requires thermal re-evaluation due to higher power dissipation at same load. |
| LMR51430RGER | Synchronous 3-A buck with 4.5–36-V input, 500-kHz/1.1-MHz switching, integrated MOSFETs; no external diode needed. | Better suited for space-constrained designs needing higher efficiency (>92%) and smaller solution size than TO-220-based layouts. | Choose for new designs prioritizing footprint reduction and efficiency; requires redesign of inductor, capacitor, and layout-no pin compatibility. |
Compared with LM2576T-12/NOPB, LM2576HVT-12/NOPB extends input range without changing board layout, while LMR51430RGER delivers superior efficiency and integration at the cost of complete redesign-neither is a drop-in replacement, but both address distinct system-level trade-offs in voltage range and miniaturization.
Availability
LM2576T-12/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, network equipment power supplies, and appliance control boards requiring stable component supply across multi-year production cycles.
Supply support for LM2576T-12/NOPB 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad manufacturing scale and long-term product lifecycle commitment.
The LM2576 series was designed as a robust, easy-to-use SIMPLE SWITCHER® solution for medium-power DC-DC conversion in cost-sensitive industrial and consumer applications where reliability and thermal simplicity outweigh ultra-high efficiency demands.
FAQ
What is the maximum input voltage rating for LM2576T-12/NOPB?
The absolute maximum input voltage for LM2576T-12/NOPB is 45 V, but the recommended operating maximum is 40 V per TI's datasheet. Exceeding 40 V risks thermal overstress in the TO-220 package without aggressive heatsinking; for 60-V operation, LM2576HVT-12/NOPB must be used instead. LM2576T-12/NOPB's 40-V limit is strictly enforced by internal transistor breakdown characteristics-not a derated specification.
Does LM2576T-12/NOPB require an external feedback resistor network?
No, LM2576T-12/NOPB does not require an external feedback resistor network because it is a fixed-output variant-the internal feedback divider is factory-trimmed to regulate precisely at 12 V. Pin 4 (FEEDBACK) is internally connected to the output and must be shorted to the output capacitor's positive terminal; leaving it open or connecting external resistors will disrupt regulation. This simplifies design versus the adjustable LM2576ADJ version.
What thermal management is required for continuous 3-A operation of LM2576T-12/NOPB?
For continuous 3-A output at 12 V with 25-V input, LM2576T-12/NOPB dissipates ~3.9 W. With RθJA = 32.4°C/W (TO-220), junction temperature rises ~126°C above ambient-requiring a minimum 2 in² copper pour plus a 10°C/W mechanical heatsink to stay below 125°C max operating junction temperature. Without heatsinking, full-load operation is limited to <40°C ambient. LM2576T-12/NOPB's metal tab must be soldered to GND plane for effective conduction cooling.
Can LM2576T-12/NOPB be synchronized to an external clock?
No, LM2576T-12/NOPB cannot be synchronized to an external clock-it features a fixed internal 52-kHz oscillator with no sync input pin or frequency adjustment capability. The oscillator frequency varies ±10% over temperature and supply, and attempts to inject signals into any pin will not lock or modulate switching. For synchronizable alternatives, consider TI's TPS54302 or LMR36015, which explicitly support external clock synchronization.
Is LM2576T-12/NOPB RoHS compliant and lead-free?
Yes, LM2576T-12/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (TI's designation for lead-free, RoHS-compliant packaging). It uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements. No exemptions apply, and the device is qualified for lead-free reflow soldering profiles up to 260°C peak temperature.
LM2576T-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- 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-12/NOPB FAQ
1.How can I place an order for LM2576T-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-12/NOPB 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-12/NOPB reliable?
The price and inventory of LM2576T-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576T-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-12/NOPB?
LM2576T-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-12/NOPB 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-12/NOPB?
For technical support, including LM2576T-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-12/NOPB requirements.
6.How does Aetrix verify that LM2576T-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576T-12/NOPB 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-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576T-12/NOPB?
All LM2576T-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-12/NOPB, 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-12/NOPB part is unused and in its original packaging.
Return procedure for LM2576T-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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