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Texas Instruments LM2576HVT-12/NOPB
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- Part No.:
- LM2576HVT-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2576HVT-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LM2576HVT-12/NOPB from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC converter in TO-220-5 (KC) package, delivering fixed 12-V output with ±4% regulation over line and load, 40–60-V input range (HV version), and 52-kHz fixed-frequency operation. It serves as a high-efficiency replacement for linear regulators in industrial power supplies, motor drives, and test equipment.
For engineers reviewing the LM2576HVT-12/NOPB datasheet, LM2576HVT-12/NOPB pinout, LM2576HVT-12/NOPB application, or LM2576HVT-12/NOPB equivalent, key selection criteria include its 60-V max input rating, integrated cycle-by-cycle current limiting, thermal shutdown protection, TTL-compatible ON/OFF control, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576HVT-12/NOPB implements a fixed-frequency, voltage-mode buck topology with an internal 52-kHz oscillator and built-in 3-A NPN switch. Its error amplifier compares feedback voltage against a 1.23-V internal reference to regulate output via duty-cycle control.
It features undervoltage lockout (UVLO) behavior tied to input rail, cycle-by-cycle peak current limiting (ICL = 4.2–6.9 A), and thermal shutdown activation at ~150°C junction temperature. Shutdown mode draws only 50 μA typical quiescent current when ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for logic, analog, and motor control circuits without external resistor divider. |
| Input Voltage Range | 40 V to 60 V (HV version) - supports wide-input industrial and automotive battery-derived supplies, including 48-V nominal systems. |
| Output Current | 3 A continuous - sufficient to drive medium-power loads such as solenoids, fans, or multiple ICs without external pass devices. |
| Oscillator Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 88% at VIN = 15 V, IOUT = 3 A - minimizes thermal dissipation and eliminates need for heatsink in many ambient conditions. |
| Standby Current | 50 μA typical - allows low-power system-level sleep modes without compromising fast wake-up response. |
| Thermal Resistance | RθJA = 32.4°C/W (TO-220 KC package) - defines maximum power dissipation limit (~3.1 W at 125°C ambient) before thermal shutdown triggers. |
Pinout & Package
LM2576HVT-12/NOPB uses the KC (TO-220-5) package with 10.16 mm × 8.51 mm body size and thermally enhanced metal tab connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Connects to high-side transistor collector; requires short, low-inductance path to input capacitor to minimize switching noise and voltage spikes. |
| 2 - OUTPUT | Switching node | Emitter of internal NPN switch; directly connects to inductor and catch diode cathode - critical for EMI layout and thermal management. |
| 3 - GROUND | Power ground | Main return path for input/output currents; must be routed with minimal impedance and shared with CIN/COUT ground connections. |
| 4 - FEEDBACK | Voltage sense | Internally tied to 12-V output; no external divider needed - simplifies design and improves stability vs. adjustable versions. |
| 5 - ON/OFF | Enable control | TTL-compatible input: <1.2 V = active, >1.4 V = shutdown; 50-μA standby current enables low-power system sequencing. |
| TAB | Thermal/GND | Electrically connected to GND; must be soldered to large copper pour or heatsink for thermal relief - essential for 3-A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-A NPN switch | Eliminates need for external MOSFET and gate driver - reduces BOM count and PCB area while maintaining robust overload handling. |
| Cycle-by-cycle current limiting | Prevents inductor saturation and switch failure during startup or short-circuit events by clamping peak switch current to 4.2–6.9 A. |
| Thermal shutdown protection | Automatically disables switching above ~150°C junction temperature - protects device and downstream circuitry without external sensors. |
| Fixed 12-V output configuration | Removes feedback resistor selection errors and layout sensitivity - delivers production-ready accuracy without tuning or calibration. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI spectrum placement and simplifies filter design using cost-effective, high-current toroidal inductors. |
Applications
| Industrial Motor Drives | Merchant Network PSU |
|---|---|
Use Scenario: Powering gate drivers, logic controllers, and sensor interfaces in 24–48-V DC-fed brushless motor systems. IC Role / Device Role / Timing Role: Primary 12-V DC-DC regulator supplying isolated control rails and auxiliary bias for half-bridge drivers. Use Value: Delivers regulated 12 V at 3 A with 88% efficiency and thermal shutdown - avoids overheating in enclosed enclosures and sustains operation under transient overloads. |
Use Scenario: Generating 12-V standby and auxiliary rails in multi-output server power supplies with 48-V backplane input. IC Role / Device Role / Timing Role: Secondary buck converter providing always-on 12-V for BMC, fan control, and memory retention during main PSU sleep. Use Value: 50-μA standby current and TTL shutdown enable precise system-level power sequencing without auxiliary LDOs. |
| Appliance Control Boards | Test & Measurement Equipment |
Use Scenario: Supplying 12-V logic and display backlight power in washing machines, HVAC controllers, and smart kitchen appliances. IC Role / Device Role / Timing Role: Main step-down regulator converting rectified AC or 24-V DC bus to clean 12-V for microcontrollers and relays. Use Value: ±4% output tolerance and 60-V HV rating accommodate wide input fluctuations from unregulated mains-derived supplies. |
Use Scenario: Providing stable 12-V bias for precision op-amps, ADC references, and signal conditioning stages in benchtop instruments. IC Role / Device Role / Timing Role: Low-noise, high-stability DC-DC source replacing linear regulators to reduce heat and improve thermal drift performance. Use Value: Fixed 12-V output eliminates resistor-divider drift; 52-kHz frequency allows effective LC filtering to achieve sub-10-mV ripple. |
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-12 | Same 12-V fixed output, but rated for 40-V max input (non-HV); RθJA = 32.4°C/W identical; same TO-220-5 package. | Suitable for ≤40-V input systems only; lacks 60-V headroom for 48-V battery transients or industrial surges. | Select LM2576T-12 only if input never exceeds 40 V and cost sensitivity outweighs surge margin requirements. |
| LM2596T-12 | Higher 150-kHz switching frequency, lower 3-A max output, 40-V max input, SO-8 package - no thermal tab; requires external diode. | Better suited for space-constrained designs where PCB area matters more than thermal performance or surge immunity. | Choose LM2596T-12 when board real estate is limited and input stays below 40 V; avoid for high-ambient or high-reliability industrial use. |
Compared with LM2576T-12, LM2576HVT-12/NOPB adds 20-V input headroom critical for 48-V systems with load-dump transients; versus LM2596T-12, it trades higher frequency for superior thermal robustness, integrated diode, and proven reliability in legacy industrial deployments.
Availability
LM2576HVT-12/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, merchant network PSUs, and appliance control boards requiring stable component supply across extended product lifecycles.
Supply support for LM2576HVT-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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in rugged, high-reliability power conversion solutions.
The LM2576 series was designed for cost-sensitive, high-volume industrial and consumer applications needing simple, robust, and thermally efficient 3-A buck regulation - prioritizing ease of use, fault resilience, and long-term manufacturability.
FAQ
What is the maximum input voltage rating for LM2576HVT-12/NOPB?
The LM2576HVT-12/NOPB is rated for a maximum input voltage of 60 V, distinguishing it from the standard LM2576 series (40 V). This HV rating supports applications with 48-V battery inputs, industrial 24/48-V buses, and systems subject to load-dump transients - all while maintaining full 3-A output capability and thermal safety margins.
Does LM2576HVT-12/NOPB require an external feedback resistor network?
No, LM2576HVT-12/NOPB does not require external feedback resistors. As a fixed 12-V output variant, its FEEDBACK pin is internally connected to the output, eliminating resistor selection errors, layout sensitivity, and drift-related regulation inaccuracies - simplifying design and improving production consistency.
How does the ON/OFF pin function on LM2576HVT-12/NOPB?
The ON/OFF pin on LM2576HVT-12/NOPB provides TTL-compatible enable control: pulling it below 1.2 V activates regulation, while raising it above 1.4 V places the device in shutdown mode with only 50 μA typical standby current. This feature enables precise system-level power sequencing and low-power sleep states without external logic.
What thermal management is required for LM2576HVT-12/NOPB at full 3-A load?
At full 3-A load and 60-V input, LM2576HVT-12/NOPB can dissipate up to ~3.1 W. With its TO-220-5 (KC) package RθJA of 32.4°C/W, a minimum 25 cm² copper pour connected to the GND tab is recommended. For sustained 3-A operation in >50°C ambient, a small heatsink attached to the metal tab is advised to prevent thermal shutdown.
Is LM2576HVT-12/NOPB RoHS-compliant and lead-free?
Yes, LM2576HVT-12/NOPB is RoHS-compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per JEDEC J-STD-609, with matte tin (Sn) termination and halogen-free molding compound - meeting global environmental compliance requirements for industrial and commercial electronics.
LM2576HVT-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):
- 60V
- 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
LM2576HVT-12/NOPB FAQ
1.How can I place an order for LM2576HVT-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVT-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 LM2576HVT-12/NOPB reliable?
The price and inventory of LM2576HVT-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 LM2576HVT-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVT-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVT-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVT-12/NOPB?
LM2576HVT-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVT-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 LM2576HVT-12/NOPB?
For technical support, including LM2576HVT-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVT-12/NOPB requirements.
6.How does Aetrix verify that LM2576HVT-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVT-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 LM2576HVT-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVT-12/NOPB?
All LM2576HVT-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVT-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 LM2576HVT-12/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVT-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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