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Texas Instruments LM2576HVS-12
- Part No.:
- LM2576HVS-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVS-12.pdf
- Description:
- IC REG BUCK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,687
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Product details
Overview
LM2576HVS-12 from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-220-5 (KC) package, delivering fixed 12 V output with ±4% tolerance over line and load, supporting 40–60 V input range, and featuring 52-kHz fixed-frequency operation for motor drives and industrial power supplies.
For engineers reviewing the LM2576HVS-12 datasheet, LM2576HVS-12 pinout, LM2576HVS-12 application, or LM2576HVS-12 equivalent, key selection criteria include HV input capability (60 V max), thermal performance (RθJA = 32.4°C/W in KC), shutdown current (50 µA typical), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576HVS-12 integrates a high-side NPN switch, fixed-frequency oscillator, error amplifier, and thermal/current protection circuitry. Its architecture uses external diode-based synchronous rectification and relies on cycle-by-cycle peak current limiting (ICL = 4.2–6.9 A) to manage overload conditions.
It operates in continuous conduction mode under full load but transitions to discontinuous mode at light loads. The feedback pin senses output voltage via internal 1.23-V reference; for fixed 12-V versions, the FEEDBACK pin is internally connected to the output, eliminating external resistor dividers.
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), enabling stable rail generation without trimming. |
| Input Voltage Range | 40 V to 60 V maximum - supports wide-input industrial and automotive battery-derived supplies without pre-regulation. |
| Output Current | 3-A DC continuous - sufficient for powering logic subsystems, sensors, and small motors directly from unregulated sources. |
| Oscillator Frequency | 52 kHz nominal (42–63 kHz over temperature) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Efficiency | 88% at VIN = 15 V, IOUT = 3 A - minimizes thermal load and eliminates need for heatsink in many ambient conditions. |
| Standby Current | 50 µA typical at ON/OFF = HIGH - supports low-power sleep modes in battery-backed or energy-conscious systems. |
| Saturation Voltage | 1.4–2.0 V at IOUT = 3 A - defines minimum dropout (VIN(min) ≈ VOUT + VSAT) and impacts thermal dissipation in high-VIN scenarios. |
Pinout & Package
LM2576HVS-12 is housed in a 5-pin TO-220 (KC) package with integrated heat tab electrically connected to GROUND, optimized for vertical mounting and heatsink attachment.
| 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 suppress switching noise. |
| 2 - OUTPUT | Switching node | Emitter of internal NPN switch; connects directly to inductor and catch diode cathode - critical for EMI layout. |
| 3 - GROUND | Power and signal reference | Common return for input/output capacitors and feedback network; must be tied to heat tab for thermal and electrical integrity. |
| 4 - FEEDBACK | Voltage sense input | Internally tied to output for fixed 12-V version; unused externally - simplifies design and improves regulation accuracy. |
| 5 - ON/OFF | Enable control | TTL-compatible shutdown: <1.2 V = active, >1.4 V = standby; floating pin disables device - requires pull-down for default-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide HV input support | 60-V absolute maximum input enables direct connection to 48-V telecom, industrial, or battery systems without front-end buck. |
| Integrated thermal shutdown | Automatic cutoff at TJ ≥ 150°C prevents latch-up or permanent damage during sustained overload or poor heatsinking. |
| Fixed-frequency PWM control | 52-kHz oscillator ensures predictable EMI spectrum and simplifies filter design versus variable-frequency alternatives. |
| Low-component-count design | Requires only four external parts (input cap, output cap, inductor, catch diode) - reduces BOM cost and layout risk. |
| Cycle-by-cycle current limit | Protects switch and inductor during short-circuit or startup surge without requiring external sensing or compensation. |
Applications
| Industrial Motor Drive Power Supply | Merchant Network Server PSU |
|---|---|
|
Use Scenario: Provides isolated 12-V bias rail for gate drivers and logic in 24–48-V DC-fed brushless motor controllers. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator converting unregulated bus to clean 12-V supply for control circuitry. Use Value: Eliminates need for linear regulators and large heatsinks; maintains regulation across wide input transients common in motor commutation. |
Use Scenario: Generates auxiliary 12-V rail in multi-output server power supplies where main rails are 3.3 V/5 V/12 V. IC Role / Device Role / Timing Role: Secondary buck converter handling mid-power auxiliary loads such as fans, LEDs, and management ICs. Use Value: High efficiency (88%) reduces system-level thermal load; 60-V input withstands hold-up capacitor discharge during AC loss. |
| Appliance Mainboard Power | Test Equipment DC Source Module |
|
Use Scenario: Powers microcontroller, display, and sensor interfaces in washing machines, HVAC controllers, and smart ovens. IC Role / Device Role / Timing Role: Central 12-V point-of-load regulator fed from 48-V or 60-V internal battery or rectified AC. Use Value: Robust 50-µA standby current extends battery life in always-on monitoring modes; thermal shutdown prevents field failures. |
Use Scenario: Serves as programmable 12-V output stage in benchtop DC power supplies or automated test equipment. IC Role / Device Role / Timing Role: Fixed-output switching stage delivering precise, ripple-controlled 12-V output with remote enable/disable. Use Value: ±4% output tolerance and excellent line/load regulation ensure measurement-grade stability; ON/OFF pin enables fast channel sequencing. |
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 | Standard-voltage version (40 V max input); identical pinout, package, and 12-V output spec. | Limited to ≤40 V input - unsuitable for 48-V+ systems or long-cable-drop applications. | Select when input never exceeds 40 V and cost sensitivity outweighs HV margin. |
| LM76003QRNXTQ1 | Synchronous 3.5-A buck with 3.5–60 V input, 2.2-MHz switching, and integrated MOSFETs. | Higher efficiency (>92%), smaller solution size, but requires more complex layout and external compensation. | Choose for space-constrained, high-efficiency designs where PCB area and thermal budget are critical. |
Compared with LM2576HVS-12, LM2576T-12 trades HV robustness for lower cost in ≤40-V systems, while LM76003QRNXTQ1 delivers higher integration and efficiency at the expense of design simplicity and external component count.
Availability
LM2576HVS-12 is available at Aetrix Electronics and suitable for industrial motor drives, merchant network server PSUs, appliance mainboards, and test equipment requiring stable component supply with long lifecycle visibility.
Supply support for LM2576HVS-12 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 technologies, with decades of experience in reliable, high-volume power IC design.
The LM2576 series was developed as part of TI's SIMPLE SWITCHER® portfolio to deliver rugged, easy-to-use buck regulators for industrial, automotive, and consumer applications where reliability and minimal external components are essential.
FAQ
What is the maximum input voltage rating for LM2576HVS-12?
The LM2576HVS-12 has an absolute maximum input voltage of 63 V and a recommended operating maximum of 60 V. This HV rating distinguishes it from standard LM2576 variants (40 V max) and enables direct use with 48-V battery systems, telecom rectifiers, and industrial DC buses without pre-regulation stages. Always observe derating guidelines per the datasheet thermal tables.
Does LM2576HVS-12 require an external feedback resistor divider?
No. The LM2576HVS-12 is a fixed 12-V output variant, so its FEEDBACK pin is internally connected to the OUTPUT pin. No external resistors are needed - this simplifies layout, improves regulation accuracy, and eliminates drift-related errors associated with external divider networks. The internal 1.23-V reference remains active but is not user-accessible in this configuration.
How does the ON/OFF pin function on LM2576HVS-12?
The ON/OFF pin on LM2576HVS-12 provides TTL-compatible enable control: logic-low (<1.2 V) activates regulation, while logic-high (>1.4 V) places the device in low-power standby with 50 µA typical quiescent current. The pin must never be left floating - a 10-kΩ pull-down resistor to GROUND ensures default-on operation. This feature supports system-level power sequencing and energy-saving sleep modes.
What package type is used for LM2576HVS-12, and how is thermal performance characterized?
The LM2576HVS-12 uses the 5-pin TO-220 (KC) package with an exposed heat tab electrically tied to GROUND. Its junction-to-ambient thermal resistance is 32.4°C/W on a standard JEDEC 4-layer board. Thermal performance improves significantly with heatsink attachment or increased PCB copper area - e.g., 1.6 in² of thermal pad reduces RθJA to ~32°C/W, enabling full 3-A output without forced air in most environments.
Can LM2576HVS-12 replace LM2576-12 in an existing design?
Yes - LM2576HVS-12 is pin-compatible and functionally identical to LM2576-12 except for its extended 60-V input rating. All electrical characteristics (12-V output, 3-A capability, 52-kHz frequency, ON/OFF behavior) match exactly. Swapping requires no PCB changes, but designers should verify that input transient margins and thermal design accommodate the higher voltage stress on external components like the catch diode and input capacitor.
LM2576HVS-12 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2576HVS-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVS-12 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 reliable?
The price and inventory of LM2576HVS-12 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 is usually 5 days.
3.What payment methods are accepted for LM2576HVS-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVS-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVS-12?
LM2576HVS-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVS-12 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?
For technical support, including LM2576HVS-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVS-12 requirements.
6.How does Aetrix verify that LM2576HVS-12 is sourced from the original manufacturer or authorized distributors?
All LM2576HVS-12 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 meets industry standards.
7.What is the process for return or replacement of LM2576HVS-12?
All LM2576HVS-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVS-12, 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 part is unused and in its original packaging.
Return procedure for LM2576HVS-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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