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Texas Instruments LM2576HVSX-12/NOPB
- Part No.:
- LM2576HVSX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVSX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,621
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Product details
Overview
LM2576HVSX-12/NOPB from Texas Instruments is a non-synchronous step-down DC-DC converter IC delivering up to 3 A output current with fixed 12 V output, 52 kHz internal oscillator frequency, ±4% output voltage tolerance over line and load, and 60 V maximum input voltage rating. It serves as the primary power conversion stage in industrial power supplies requiring high-input-voltage buck regulation without external MOSFET drivers.
For engineers reviewing the LM2576HVSX-12/NOPB datasheet, LM2576HVSX-12/NOPB pinout, LM2576HVSX-12/NOPB application, or LM2576HVSX-12/NOPB equivalent, key selection criteria include HV input capability (up to 60 V), TO-263-5 thermal performance (RθJA = 42.6°C/W), cycle-by-cycle current limiting (ICL = 4.2–6.9 A), TTL-compatible ON/OFF control, and fixed-frequency operation enabling predictable EMI filtering.
Technical Context
The LM2576HVSX-12/NOPB integrates a 3-A NPN switch, fixed 52 kHz oscillator, error amplifier with 1.23 V reference, and thermal shutdown circuitry in a monolithic buck regulator architecture. Its non-synchronous design uses an external catch diode and requires only four external components - input capacitor, output capacitor, inductor, and feedback network (shorted for fixed 12 V).
It operates in continuous conduction mode under full load (3 A) at typical input voltages ≥15 V and transitions to discontinuous mode at light loads. Protection features include cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout via the ON/OFF pin, with standby current of 50 μA typical when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for motor drivers or industrial logic without external resistor divider. |
| Max Input Voltage | 60 V - supports wide-range industrial inputs including 48 V nominal systems with transients, unlike standard 40 V LM2576 variants. |
| Output Current | 3 A DC - sufficient for powering FPGA I/O banks, PLC modules, or small servo amplifiers without parallel devices. |
| Oscillator Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors and simplifies EMI filter design versus MHz-range converters. |
| Efficiency | 88% at VIN = 15 V, IOUT = 3 A - reduces thermal load vs linear regulators; eliminates need for heatsink in many 12 V/3 A applications. |
| Standby Current | 50 μA typical - enables low-power system-level shutdown without auxiliary LDOs or discrete FETs. |
| Current Limit | 4.2–6.9 A (typical 5.8 A) - provides robust short-circuit protection while allowing safe startup into capacitive loads. |
Pinout & Package
LM2576HVSX-12/NOPB uses the KTT (DDPAK/TO-263-5) surface-mount package with 10.16 mm × 8.42 mm body size and thermally enhanced exposed tab connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | High-side switch collector input | Connects directly to unregulated DC input (≤60 V); requires short, low-inductance path to CIN for stability. |
| 2 OUTPUT | Switch emitter node | Drives inductor and cathode of external catch diode; switching node must be minimized in area to reduce EMI. |
| 3 GROUND | Power and signal reference | Low-impedance return path for VIN bypass, OUTPUT loop, and feedback; connects to exposed tab for thermal conduction. |
| 4 FEEDBACK | Voltage regulation sense | Internally tied to 12 V output - no external resistors required; floating or misconnected causes regulation failure. |
| 5 ON/OFF | TTL-compatible enable control | Logic high (>1.4 V) disables regulator with 50 μA standby; logic low (<1.2 V) enables; must not float. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (40–60 V) | Enables direct regulation from 48 V telecom or industrial bus without pre-regulator, reducing BOM count and board space. |
| Fixed-frequency 52 kHz operation | Allows deterministic EMI filter design using standard off-the-shelf inductors and capacitors, avoiding variable-frequency noise spread. |
| Cycle-by-cycle current limiting | Prevents destructive inductor saturation during output shorts or heavy transient loads without external sensing circuitry. |
| Thermal shutdown protection | Automatically disables switching if junction temperature exceeds 150°C, preventing permanent damage during overload or poor heatsinking. |
| Requires only 4 external components | Eliminates need for compensation networks or gate drivers - simplifies layout, accelerates prototyping, and improves reliability. |
Applications
| Industrial Motor Drives | Merchant Network PSU |
|---|---|
Use Scenario: Powering gate drivers and logic rails in 24–48 V DC-fed brushless motor controllers. IC Role / Device Role / Timing Role: Primary 12 V buck regulator supplying isolated gate driver bias and microcontroller I/O rails. Use Value: 60 V max input withstands motor back-EMF spikes; 3 A output supports multiple half-bridge drivers simultaneously. | Use Scenario: Generating 12 V auxiliary rail in multi-output server power supplies with 48 V intermediate bus. IC Role / Device Role / Timing Role: Secondary regulated output stage converting 48 V intermediate bus to stable 12 V for fan controllers and monitoring ICs. Use Value: High efficiency (88%) minimizes heat in dense PSU layouts; TO-263 thermal performance supports convection-only cooling. |
| Test Equipment Power | Appliance Control Boards |
Use Scenario: Providing clean, regulated 12 V for analog front-ends and digital logic in portable multimeters and signal generators. IC Role / Device Role / Timing Role: Main DC-DC converter delivering low-noise 12 V from rechargeable Li-ion or AC adapter input. Use Value: Fixed 52 kHz frequency enables effective LC filtering; ±4% tolerance ensures ADC reference stability across operating conditions. | Use Scenario: Supplying 12 V to relay drivers, display backlight inverters, and MCU peripherals in smart home appliances. IC Role / Device Role / Timing Role: Central power management IC converting rectified AC or 24 V DC to isolated 12 V control rail. Use Value: TTL ON/OFF allows synchronized power sequencing with main controller; thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576SX-12/NOPB | 40 V max input (vs. 60 V), identical pinout and electrical specs otherwise. | Suitable only for ≤40 V input systems; cannot replace LM2576HVSX-12/NOPB in 48 V bus applications. | Select when input voltage never exceeds 40 V and cost sensitivity outweighs HV margin. |
| LM76003QRNLRQ1 | Synchronous 3.5 A, 3.5–60 V input, 300 kHz–2.2 MHz adjustable frequency, integrated high/low-side MOSFETs. | Higher efficiency (≥92%), smaller solution size, but requires more complex layout and external compensation. | Choose for new designs needing higher efficiency or smaller footprint; not drop-in compatible due to different pinout and control scheme. |
Compared with LM2576SX-12/NOPB, LM2576HVSX-12/NOPB adds 20 V input headroom critical for 48 V systems with transients; compared with LM76003QRNLRQ1, it trades efficiency and integration for simplicity, lower EMI, and proven reliability in legacy industrial designs.
Availability
LM2576HVSX-12/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, merchant network PSUs, and appliance control boards requiring stable component supply with long-term lifecycle support.
Supply support for LM2576HVSX-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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer markets.
The LM2576 series was designed as a rugged, easy-to-use replacement for linear regulators in medium-power DC-DC applications, emphasizing simplicity, fault protection, and compatibility with standard magnetics.
FAQ
What is the maximum input voltage rating for LM2576HVSX-12/NOPB?
The LM2576HVSX-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 the standard LM2576 (40 V max) and enables use in 48 V industrial and telecom systems with transient margins. Exceeding 60 V risks permanent device damage.
Does LM2576HVSX-12/NOPB require external feedback resistors?
No, LM2576HVSX-12/NOPB does not require external feedback resistors. As a fixed-output version, its internal feedback divider is factory-trimmed for 12 V regulation. Pin 4 (FEEDBACK) is internally connected to the output; connecting external resistors will disrupt regulation. This simplifies design and improves accuracy versus adjustable variants.
What package type is used by LM2576HVSX-12/NOPB?
LM2576HVSX-12/NOPB uses the KTT package - a 5-pin DDPAK/TO-263 surface-mount variant with an exposed thermal pad connected to GND. Its 10.16 mm × 8.42 mm footprint and low RθJA (42.6°C/W) make it suitable for high-power density industrial PCBs where thermal management is critical.
How does the ON/OFF pin function on LM2576HVSX-12/NOPB?
The ON/OFF pin (Pin 5) provides TTL-compatible enable control: logic low (<1.2 V) enables regulation, logic high (>1.4 V) disables it with 50 μA typical standby current. It must never be left floating - tie to GND for always-on operation or drive with a microcontroller GPIO. This feature enables system-level power sequencing and energy-saving sleep modes.
What is the typical efficiency of LM2576HVSX-12/NOPB at full load?
LM2576HVSX-12/NOPB achieves 88% typical efficiency at VIN = 15 V, IOUT = 3 A, per Section 6.7 of the TI datasheet. Efficiency varies with input voltage and load - e.g., ~77% at VIN = 12 V/3 A (Section 6.9) and ~88% at VIN = 18 V/3 A (Section 6.8). These values assume optimal external components per Figure 8-3.
LM2576HVSX-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:
- Tape & Reel (TR)
- 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)
LM2576HVSX-12/NOPB FAQ
1.How can I place an order for LM2576HVSX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVSX-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 LM2576HVSX-12/NOPB reliable?
The price and inventory of LM2576HVSX-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 LM2576HVSX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVSX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVSX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVSX-12/NOPB?
LM2576HVSX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVSX-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 LM2576HVSX-12/NOPB?
For technical support, including LM2576HVSX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVSX-12/NOPB requirements.
6.How does Aetrix verify that LM2576HVSX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVSX-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 LM2576HVSX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVSX-12/NOPB?
All LM2576HVSX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVSX-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 LM2576HVSX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVSX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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