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Texas Instruments LM2576HVSX-12
- Part No.:
- LM2576HVSX-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVSX-12.pdf
- Description:
- IC REG BUCK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,527
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Product details
Overview
LM2576HVSX-12 from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-263 (DDPAK) 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, cycle-by-cycle current limiting, and thermal shutdown for motor drive and industrial PSU applications.
For engineers reviewing the LM2576HVSX-12 datasheet, LM2576HVSX-12 pinout, LM2576HVSX-12 application, or LM2576HVSX-12 equivalent, key selection considerations include its HV input rating (60 V max), 3-A continuous output capability, ON/OFF logic control interface, integrated switch saturation voltage (1.8 V typ), and thermal performance on PCB copper planes.
Technical Context
The LM2576HVSX-12 implements a fixed-frequency buck topology with internal 52-kHz oscillator and single NPN power switch. Its feedback loop uses a precision 1.23-V bandgap reference and error amplifier to regulate output via external resistor divider (not required for fixed 12-V version).
It operates in active mode when ON/OFF pin voltage drops below 1.2 V, entering shutdown with 50-μA standby current above 1.4 V. Protection includes cycle-by-cycle current limit (5.8-A typ), thermal shutdown, and undervoltage lockout behavior enabled externally.
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) |
| Input Voltage Range | 40 V to 60 V - enables use in 48-V telecom, industrial, and high-voltage battery systems |
| Output Current | 3 A continuous - supports mid-power loads without external current boosting |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity |
| Switch Saturation Voltage | 1.8 V typical at 3 A - defines minimum dropout voltage and impacts efficiency at low VIN/VOUT ratios |
| Standby Quiescent Current | 50 μA typical - allows low-power system-level sleep modes without auxiliary LDOs |
| Thermal Resistance (RθJA) | 42.6°C/W (KTT package, JEDEC 4-layer board) - requires ≥1.6 in² copper pour for full 3-A operation at 125°C ambient |
Pinout & Package
LM2576HVSX-12 is housed in a 5-pin DDPAK/TO-263 (KTT) thermally enhanced surface-mount package with exposed tab electrically connected to GND for heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Connects to high-side NPN collector; must be decoupled with low-ESR capacitor within 5 mm path to GND |
| 2 - OUTPUT | Switching node | Drives external inductor and catch diode cathode; high dv/dt node requiring tight layout and ground shielding |
| 3 - GROUND | Power and signal reference | Low-impedance return path for VIN bypass, feedback, and ON/OFF; tied to exposed tab for thermal conduction |
| 4 - FEEDBACK | Voltage sense input | Internally referenced to 1.23 V; shorted to output for fixed 12-V operation; unused but must be grounded if left unconnected |
| 5 - ON/OFF | Enable control | TTL-compatible logic input: <1.2 V = active, >1.4 V = shutdown; 50-μA leakage enables simple microcontroller GPIO control |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input support | 60-V absolute maximum rating enables direct integration into 48-V rail systems without pre-regulation |
| Integrated protection | Cycle-by-cycle current limiting (5.8-A typ) and thermal shutdown prevent failure during overload or poor heatsinking |
| Minimal external components | Only four components required: input cap, output cap, inductor, and catch diode - reduces BOM count and layout area |
| Fixed-frequency operation | 52-kHz switching simplifies EMI filter design and avoids audible noise while maintaining high efficiency |
| Thermally optimized package | KTT (TO-263) package with GND-connected tab allows PCB copper plane to serve as primary heatsink - no separate heatsink needed at ≤2 A |
Applications
| Motor Drives | Industrial PSUs |
|---|---|
Use Scenario: Powering gate drivers and logic circuitry in 24–48-V brushless DC motor controllers. IC Role / Device Role / Timing Role: Primary 12-V buck regulator supplying isolated gate driver bias and MCU I/O rails. Use Value: 60-V input rating accommodates bus transients; 3-A output sustains peak gate charge currents without droop. | Use Scenario: Secondary-side regulation in merchant server power supplies converting 48-V intermediate bus to 12-V system rails. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter replacing linear regulators to eliminate heat sink requirements. Use Value: High efficiency (88% at 15-VIN/3-A) reduces thermal load; KTT package enables compact, thermally robust layout. |
| Test Equipment | Appliances |
Use Scenario: Generating stable 12-V supply for analog front-end circuitry in portable multimeters and signal analyzers. IC Role / Device Role / Timing Role: Low-noise, regulated power source for precision ADC references and op-amp biasing. Use Value: Fixed 52-kHz frequency enables predictable EMI filtering; ±4% output tolerance meets 12-bit measurement accuracy requirements. | Use Scenario: Main 12-V rail for control boards in HVAC systems and commercial kitchen appliances. IC Role / Device Role / Timing Role: Robust, cost-optimized power converter for microcontroller, display, and sensor subsystems. Use Value: Wide −40°C to +125°C operating range ensures reliability in enclosed, high-ambient environments; ON/OFF pin enables energy-saving sleep states. |
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 | Lower max input voltage (40 V vs. 60 V); identical pinout, package, and 12-V output spec | Suitable only for ≤40-V input systems; not rated for 48-V bus transient immunity | Select LM2576SX-12 only when input never exceeds 40 V and cost is prioritized over HV margin |
| LM76003QRNXTQ1 | Synchronous 3.5-A converter; 3.5–60-V input; 300-kHz–2.2-MHz adjustable frequency; smaller QFN package | Higher efficiency (≥92%), lower EMI, and smaller solution size-but requires more external components and layout care | Choose LM76003QRNXTQ1 for new designs needing higher efficiency, automotive qualification, or space-constrained layouts |
Compared with LM2576SX-12, the LM2576HVSX-12 adds 20-V input headroom critical for 48-V systems; versus LM76003QRNXTQ1, it trades efficiency and footprint for simplicity, BOM count, and proven ruggedness in legacy industrial designs.
Availability
LM2576HVSX-12 is available at Aetrix Electronics and suitable for motor drives, industrial PSUs, test equipment, and appliance control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2576HVSX-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 company specializing in analog, embedded processing, and power management ICs, with leadership in industrial, automotive, and communications markets.
The LM2576xx series was designed as a drop-in, high-reliability replacement for linear regulators in medium-power DC-DC conversion, emphasizing ease of use, fault resilience, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2576HVSX-12?
The LM2576HVSX-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 nominal systems including transient surges. Operation beyond 60 V voids specifications and risks permanent damage to the internal NPN switch.
Does LM2576HVSX-12 require an external feedback resistor network?
No, LM2576HVSX-12 does not require external feedback resistors because it is a fixed 12-V output variant. The FEEDBACK pin is internally connected to the 12-V output; per datasheet guidance, it should be shorted to the output capacitor's positive terminal or left unconnected (but not floating). Adding external resistors would disrupt regulation and is unnecessary.
What thermal management is required for full 3-A operation of LM2576HVSX-12?
For continuous 3-A output at maximum ambient temperature (125°C), LM2576HVSX-12 requires ≥1.6 in² of 2-oz copper connected to its exposed GND tab on the PCB. With this copper area, junction-to-ambient thermal resistance drops to 32°C/W. Without adequate copper, thermal shutdown will activate under sustained load - verified by the RθJA = 42.6°C/W rating on standard JEDEC 4-layer board.
Can LM2576HVSX-12 be synchronized to an external clock?
No, LM2576HVSX-12 cannot be synchronized to an external clock. It uses an internal fixed-frequency 52-kHz oscillator with ±10% tolerance. There is no SYNC pin or frequency-adjust capability. For designs requiring synchronization or variable frequency, consider alternatives like LM76003 or LMR51430, which offer programmable switching frequencies and external sync inputs.
Is LM2576HVSX-12 RoHS compliant and halogen-free?
Yes, LM2576HVSX-12 is RoHS compliant and halogen-free per Texas Instruments' official packaging and environmental data. The KTT (TO-263) package uses lead-free matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements. Full compliance documentation, including material declarations and test reports, is available in TI's product folder for LM2576HVSX-12.
LM2576HVSX-12 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:
- 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)
LM2576HVSX-12 FAQ
1.How can I place an order for LM2576HVSX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVSX-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 LM2576HVSX-12 reliable?
The price and inventory of LM2576HVSX-12 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 is usually 5 days.
3.What payment methods are accepted for LM2576HVSX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVSX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVSX-12?
LM2576HVSX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVSX-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 LM2576HVSX-12?
For technical support, including LM2576HVSX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVSX-12 requirements.
6.How does Aetrix verify that LM2576HVSX-12 is sourced from the original manufacturer or authorized distributors?
All LM2576HVSX-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 LM2576HVSX-12 meets industry standards.
7.What is the process for return or replacement of LM2576HVSX-12?
All LM2576HVSX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVSX-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 LM2576HVSX-12 part is unused and in its original packaging.
Return procedure for LM2576HVSX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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