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Texas Instruments LM2576HVS-12/NOPB
- Part No.:
- LM2576HVS-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVS-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:403
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Product details
Overview
LM2576HVS-12/NOPB from Texas Instruments is a non-synchronous 3-A step-down DC-DC switching regulator in TO-220-5 (KC) package, delivering fixed 12-V output with ±4% tolerance over line and load, supporting 40 V to 60 V input range (HV version), and operating at 52-kHz fixed frequency for motor drives and industrial power supplies.
For engineers reviewing the LM2576HVS-12/NOPB datasheet, LM2576HVS-12/NOPB pinout, LM2576HVS-12/NOPB application, or LM2576HVS-12/NOPB equivalent, key selection considerations include its HV input capability (60 V max), thermal performance in TO-220 package (RθJA = 32.4°C/W), TTL-compatible ON/OFF control, and cycle-by-cycle current limiting for overload protection.
Technical Context
The LM2576HVS-12/NOPB integrates a high-side NPN switch, fixed-frequency oscillator, error amplifier, and thermal shutdown circuit in a monolithic buck topology. It uses external diode, inductor, and capacitors-requiring only four components-and implements undervoltage lockout via the ON/OFF pin.
Its functional mode includes active regulation below 1.2 V on ON/OFF pin and shutdown with 50 μA standby current above 1.4 V. Current limiting activates at 4.2–6.9 A (typical 5.8 A), and oscillator frequency drops to ~11 kHz during short-circuit events to reduce power dissipation.
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 and analog circuits without external feedback resistors. |
| Input Voltage Range | 40 V to 60 V - supports wide-input industrial, automotive, and telecom power buses where transient spikes exceed standard 40-V limits. |
| Output Current | 3 A continuous - sufficient to drive motors, solenoids, or multiple downstream regulators without derating at 25°C ambient. |
| Switching 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 heat generation and eliminates need for heatsink in many medium-power applications. |
| Standby Current | 50 μA typical - allows low-power system-level sleep modes without compromising fast wake-up response. |
| Saturation Voltage | 1.8 V max at 3 A - defines minimum dropout voltage (VIN(min) ≈ VOUT + VSAT) and impacts thermal design at high duty cycles. |
Pinout & Package
LM2576HVS-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. The tab must be mounted to a heatsink or large copper pour for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | High-side switch collector input | Connects directly to unregulated DC input; requires short, low-inductance path to input capacitor to minimize switching noise and voltage spikes. |
| 2 - OUTPUT | Switch emitter node | Drives external catch diode and inductor; high dv/dt node requiring careful PCB layout to avoid EMI coupling into feedback or control paths. |
| 3 - GROUND | Power and signal reference | Low-impedance return path for input/output capacitors and feedback network; must be tied to tab for optimal thermal conduction. |
| 4 - FEEDBACK | Regulation sense input | Internally referenced to 1.23 V; for fixed 12-V version, this pin is internally connected to output - no external divider required. |
| 5 - ON/OFF | Enable/disable control | TTL-compatible logic input: <1.2 V = active, >1.4 V = shutdown; 50-μA standby current enables direct microcontroller GPIO control without level-shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external resistor divider, reducing BOM count and improving long-term output stability versus adjustable versions. |
| 60-V maximum input | Enables operation in 48-V industrial systems with 20% transients, eliminating need for upstream pre-regulators or TVS clamping. |
| Cycle-by-cycle current limit | Prevents inductor saturation and MOSFET failure during startup or short-circuit events without requiring external current-sense circuitry. |
| Thermal shutdown | Protects device under sustained overload or inadequate heatsinking; auto-recovery occurs once junction temperature falls below 150°C threshold. |
| 52-kHz oscillator | Optimizes trade-off between inductor size/cost and switching losses - avoids audible noise while maintaining efficiency above 85%. |
Applications
| Industrial Motor Control | Test Equipment Power Supply |
|---|---|
Use Scenario: Powers brushed DC motors and position sensors in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Primary 12-V buck regulator supplying motor driver ICs and analog front-ends. Use Value: 60-V input rating tolerates 48-V bus transients; 3-A output sustains peak motor stall currents without foldback. | Use Scenario: Provides clean, regulated 12-V rail for benchtop oscilloscopes and multimeters with variable load profiles. IC Role / Device Role / Timing Role: Main DC-DC stage converting AC-DC adapter output to stable 12-V supply. Use Value: Low 50-μA standby current enables battery-backed sleep mode; ±4% output tolerance meets instrument-grade accuracy requirements. |
| Appliance Power Management | Merchant Server PSU |
Use Scenario: Supplies 12-V fans, pumps, and control logic in commercial refrigeration units exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Secondary regulator deriving 12 V from higher-voltage intermediate bus. Use Value: Thermal shutdown and current limit ensure reliability in sealed enclosures with limited airflow; TO-220 package simplifies mechanical mounting. | Use Scenario: Generates auxiliary 12-V rail for motherboard management controllers (BMC) and fan controllers in rack-mounted servers. IC Role / Device Role / Timing Role: Standalone point-of-load converter for non-critical subsystems. Use Value: Fixed-output architecture reduces component count and qualification effort; 52-kHz switching avoids interference with high-speed digital clock domains. |
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/LF03 | Same pinout, same electrical specs, but TO-220-5 package with different marking and RoHS compliance code; no functional difference. | Identical use cases - drop-in replacement where LF03 suffix is specified in legacy BOMs. | Select based on distributor availability and tape-and-reel vs. tube packaging preference. |
| LM2576HV-12 | Same 60-V max input and 12-V fixed output, but KTT (DDPAK/TO-263) surface-mount package with lower RθJA (42.6°C/W) and no through-hole mounting. | Preferred for automated SMT assembly and space-constrained PCBs; requires thermal pad layout per JEDEC 4-layer board guidelines. | Choose LM2576HVS-12/NOPB for through-hole prototyping or heatsink-integrated designs; choose LM2576HV-12 for volume production with reflow soldering. |
Compared with LM2576T-12/LF03, LM2576HVS-12/NOPB offers identical performance with TI's NOPB (no lead-free exemption) compliance, while LM2576HV-12 provides superior thermal resistance in surface-mount form - enabling higher ambient operation without heatsink in compact server modules.
Availability
LM2576HVS-12/NOPB is available at Aetrix Electronics and suitable for industrial motor control, test equipment power supplies, appliance power management, and merchant server PSU applications requiring stable component supply across extended product lifecycles.
Supply support for LM2576HVS-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, embedded processing, and power management technologies with over 90 years of innovation in industrial, automotive, and consumer electronics.
The LM2576 series was designed as a robust, easy-to-use replacement for linear regulators in medium-power DC-DC conversion, targeting cost-sensitive industrial and infrastructure applications where reliability, thermal resilience, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for LM2576HVS-12/NOPB?
The LM2576HVS-12/NOPB has a maximum input voltage rating of 60 V, confirmed in the Absolute Maximum Ratings table and Recommended Operating Conditions section of the official TI datasheet SNVS107G. This HV rating distinguishes it from standard LM2576 variants (40 V max) and enables use in 48-V industrial systems with transient headroom. Exceeding 60 V risks permanent damage.
Does LM2576HVS-12/NOPB require external feedback resistors?
No, LM2576HVS-12/NOPB does not require external feedback resistors. As a fixed-output 12-V variant, the feedback pin (Pin 4) is internally connected to the output, eliminating the need for an external resistor divider. This simplifies design, improves long-term output stability, and reduces component count compared to the adjustable LM2576ADJ version.
What thermal management is required for LM2576HVS-12/NOPB at full 3-A load?
At full 3-A load with 60-V input, LM2576HVS-12/NOPB dissipates approximately 2.4 W (calculated from VSAT × IOUT). With RθJA = 32.4°C/W in TO-220 package, junction temperature rise is ~78°C above ambient. To maintain TJ ≤ 125°C, ambient must stay below 47°C unless a heatsink is used. Mounting the metal tab to ≥2 in² copper area reduces RθJA to ~32°C/W per TI layout guidance.
Can LM2576HVS-12/NOPB be synchronized to an external clock?
No, LM2576HVS-12/NOPB cannot be synchronized to an external clock. It features a fixed internal 52-kHz oscillator with ±10% tolerance and no synchronization pin or frequency adjustment capability. For synchronizable alternatives, consider newer TI parts like LMR51430 or LM76003, which support external clock injection and programmable switching frequencies.
What protection features are integrated into LM2576HVS-12/NOPB?
LM2576HVS-12/NOPB integrates cycle-by-cycle current limiting (4.2–6.9 A), thermal shutdown (150°C trip), and undervoltage lockout via the ON/OFF pin. It also features 50-μA standby current in shutdown mode and automatic frequency reduction (~11 kHz) during output short-circuit conditions to limit average power dissipation - all without requiring external protection circuitry.
LM2576HVS-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2576HVS-12/NOPB FAQ
1.How can I place an order for LM2576HVS-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVS-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 LM2576HVS-12/NOPB reliable?
The price and inventory of LM2576HVS-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 LM2576HVS-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVS-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVS-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVS-12/NOPB?
LM2576HVS-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVS-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 LM2576HVS-12/NOPB?
For technical support, including LM2576HVS-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVS-12/NOPB requirements.
6.How does Aetrix verify that LM2576HVS-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVS-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 LM2576HVS-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVS-12/NOPB?
All LM2576HVS-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVS-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 LM2576HVS-12/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVS-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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