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Texas Instruments LM2576HVSX-15
- Part No.:
- LM2576HVSX-15
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVSX-15.pdf
- Description:
- IC REG BUCK 15V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,132
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Product details
Overview
LM2576HVSX-15 from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-263 (DDPAK) package, delivering fixed 15-V output with ±4% tolerance over line and load, supporting 18–60-V input range and featuring 52-kHz fixed-frequency operation, cycle-by-cycle current limiting, and TTL-compatible ON/OFF shutdown control for industrial power supplies.
For engineers reviewing the LM2576HVSX-15 datasheet, LM2576HVSX-15 pinout, LM2576HVSX-15 application, or LM2576HVSX-15 equivalent, key selection considerations include its HV input rating (60 V max), thermal performance on PCB copper planes, 50-μA standby current in shutdown mode, and compatibility with standard off-the-shelf inductors for rapid buck converter implementation.
Technical Context
The LM2576HVSX-15 integrates a high-side NPN switch, internal 52-kHz oscillator, error amplifier, bandgap reference (1.23 V), and thermal shutdown circuitry. Its fixed 15-V output is set internally-no external feedback divider required-enabling minimal BOM count with only four external components: input capacitor, output capacitor, inductor, and catch diode.
It operates in continuous conduction mode under full 3-A load at typical input voltages (e.g., 25 V), with saturation voltage of 1.4–2.0 V (typ/max) and current limit threshold of 4.2–6.9 A (min/max), ensuring robust overload protection without external sensing. Shutdown is asserted when ON/OFF pin voltage exceeds 1.4 V, reducing quiescent current to 50 μA (typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over full temperature and load range-eliminates feedback resistor network and simplifies layout. |
| Input Voltage Range | 18 V to 60 V-supports wide-range industrial, telecom, and battery-derived inputs without pre-regulation. |
| Max Output Current | 3 A DC continuous-sufficient for mid-power subsystems such as motor drivers or FPGA core rails. |
| Oscillator Frequency | 52 kHz (±10%)-enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Standby Current | 50 μA typical at shutdown-critical for low-power standby modes in energy-conscious systems. |
| Thermal Resistance | RθJA = 42.6°C/W (KTT package, JEDEC 4-layer board)-requires ≥1 in² copper pour for reliable 3-A operation at 125°C ambient. |
| Saturation Voltage | 1.4 V (typ), ≤2.0 V (max) at 3 A-directly impacts conduction loss and efficiency at high duty cycles. |
| Current Limit | 4.2–6.9 A (min–max)-provides cycle-by-cycle protection during short-circuit or startup surge conditions. |
Pinout & Package
LM2576HVSX-15 uses the KTT (DDPAK/TO-263-5) surface-mount package with integrated heat slug connected to GND; thermal performance improves significantly with PCB copper area (e.g., RθJA drops from 42.6°C/W to 32°C/W with ≥1.6 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | High-side switch collector input | Connects directly to unregulated DC input and high-frequency bypass capacitor; shortest possible trace minimizes switching noise. |
| 2 - OUTPUT | Switch emitter node | Drives inductor and catch diode anode; high dv/dt node requiring tight loop area and ground plane separation. |
| 3 - GROUND | Power and signal reference | Low-impedance return path for input cap, output cap, and feedback; must tie to thermal pad for optimal heat dissipation. |
| 4 - FEEDBACK | Regulation sense input | Internally tied to 15-V reference-leave unconnected for fixed-output version; floating or miswired causes regulation failure. |
| 5 - ON/OFF | TTL-compatible enable control | Logic-high (>1.4 V) disables switching and enters 50-μA standby; logic-low (<1.2 V) enables regulation-never float. |
| TAB | Thermal pad / GND connection | Electrically and thermally connected to GND; requires solder mask defined thermal relief and ≥6 vias to inner ground planes. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15-V output | Eliminates external resistor divider, reducing component count, layout sensitivity, and long-term drift errors. |
| 60-V maximum input | Supports 48-V telecom, 36-V battery stacks, and transient-tolerant industrial rails without external TVS or LDO pre-regulator. |
| 52-kHz fixed frequency | Enables predictable EMI filtering design and compatibility with low-cost, high-current toroidal inductors (e.g., 150 µH, 5 A). |
| Cycle-by-cycle current limit | Prevents MOSFET or inductor saturation during output shorts or heavy transients without external current-sense circuitry. |
| TTL shutdown interface | Direct microcontroller GPIO compatibility-no level-shifting needed-and 50-μA standby current extends battery life. |
| Thermal shutdown protection | Automatically disables switching above 150°C junction temperature, preventing permanent damage during airflow loss or overload. |
Applications
| Industrial Motor Drives | Merchant Server PSU |
|---|---|
Use Scenario: Powering gate drivers and logic circuits in 24–48-V brushless DC motor controllers where input voltage varies with bus ripple and load transients. IC Role / Device Role / Timing Role: Primary 15-V buck regulator supplying isolated gate driver bias and MCU I/O rails. Use Value: Delivers stable 15 V at 3 A with <150-mV output ripple (typ) and fast load transient recovery (<100 µs), enabling reliable MOSFET switching even under 5-A peak load steps. | Use Scenario: Generating auxiliary 15-V rail in multi-output server power supplies for fan controllers, sensor interfaces, and BMC management ICs. IC Role / Device Role / Timing Role: Secondary regulated output derived from main 48-V or 12-V intermediate bus. Use Value: Achieves >88% efficiency at 18-V input/3-A load, minimizing heat buildup in dense 1U chassis while maintaining ±4% output accuracy across -40°C to +85°C ambient. |
| Appliance Control Boards | Test Equipment Power Rails |
Use Scenario: Providing clean 15-V supply for solenoid drivers, display backlights, and microcontroller peripherals in washing machines and HVAC systems. IC Role / Device Role / Timing Role: Main DC-DC converter replacing linear regulators to eliminate heatsinks and reduce board space. Use Value: Reduces thermal footprint by >70% versus equivalent 3-A linear solution, enabling conformal coating and sealed enclosure designs without forced cooling. | Use Scenario: Powering analog front-ends and precision DACs in portable benchtop instruments requiring low-noise, stable 15-V bias. IC Role / Device Role / Timing Role: Low-ripple 15-V source feeding active filters and reference buffers before ADC stages. Use Value: Combined with optional LC post-filter (Fig. 7-4), achieves <1 mVpp output ripple-meeting EN 61000-4-3 immunity requirements for sensitive measurement circuits. |
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-15 | Lower max input voltage (40 V vs. 60 V); identical pinout, package, and 15-V output spec. | Not suitable for >40-V input systems (e.g., 48-V telecom, 36-V battery packs with surge margin). | Select LM2576SX-15 only if input never exceeds 40 V and cost is primary constraint. |
| LM76003QRNXTQ1 | Synchronous 3.5-A buck with 3.5–60-V input, 2.2-MHz switching, and integrated high-/low-side FETs-no external diode required. | Higher efficiency (>92% at 12 VIN/3 A), smaller solution size, but requires more complex layout and external compensation. | Choose LM76003QRNXTQ1 for new designs prioritizing efficiency, size, and automotive qualification (AEC-Q100). |
Compared with LM2576HVSX-15, LM2576SX-15 offers identical functionality at lower voltage stress but lacks HV headroom, while LM76003QRNXTQ1 delivers higher efficiency and integration at the cost of increased design complexity and reduced fault tolerance due to synchronous architecture.
Availability
LM2576HVSX-15 is available at Aetrix Electronics and suitable for industrial motor drives, merchant server PSUs, appliance control boards, and test equipment requiring stable component supply with long lifecycle visibility and consistent parametric performance.
Supply support for LM2576HVSX-15 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 broad industrial and automotive reach.
The LM2576xx series was designed as a robust, easy-to-use replacement for linear regulators in medium-power DC-DC conversion-emphasizing simplicity, thermal resilience, and wide-input-voltage capability for harsh environments.
FAQ
What is the maximum input voltage rating for LM2576HVSX-15?
The LM2576HVSX-15 supports a maximum input voltage of 60 V, confirmed in the Absolute Maximum Ratings table (Section 6.1) and Recommended Operating Conditions (Section 6.3). This HV rating distinguishes it from the standard LM2576 series (40 V max) and enables direct use with 48-V systems, battery stacks, and transient-prone industrial rails without pre-regulation.
Does LM2576HVSX-15 require external feedback resistors to set the output voltage?
No, LM2576HVSX-15 does not require external feedback resistors. As a fixed-output variant, its 15-V regulation is implemented internally-the FEEDBACK pin (Pin 4) is unused and must remain unconnected. External resistors are only required for the adjustable version (LM2576HVSX-ADJ), per the Functional Block Diagram and Pin Functions table.
What package type is used by LM2576HVSX-15, and how does it impact thermal design?
LM2576HVSX-15 uses the KTT (DDPAK/TO-263-5) surface-mount package with an exposed thermal pad electrically connected to GND. Its junction-to-ambient thermal resistance is 42.6°C/W on a JEDEC 4-layer board, but drops to 32°C/W with ≥1.6 in² of PCB copper-making thermal pad soldering and via placement critical for sustained 3-A operation at elevated ambient temperatures.
Can LM2576HVSX-15 be synchronized to an external clock?
No, LM2576HVSX-15 cannot be synchronized to an external clock. It features a fixed internal 52-kHz oscillator with ±10% tolerance (Section 6.10), and no synchronization pin or frequency-adjust capability is provided. For externally synchronized operation, consider newer alternatives like the LM76003, which supports SYNC pin operation up to 2.2 MHz.
What protection features are built into LM2576HVSX-15?
LM2576HVSX-15 includes cycle-by-cycle current limiting (4.2–6.9 A threshold), thermal shutdown (activates at 150°C junction temperature), and undervoltage lockout (internal, no external components needed). These protections operate autonomously without external circuitry-ensuring safe operation during output shorts, overloads, or excessive ambient temperature conditions.
LM2576HVSX-15 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:
- Discontinued at Digi-Key
- 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):
- 15V
- 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-15 FAQ
1.How can I place an order for LM2576HVSX-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVSX-15 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-15 reliable?
The price and inventory of LM2576HVSX-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576HVSX-15 is usually 5 days.
3.What payment methods are accepted for LM2576HVSX-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVSX-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVSX-15?
LM2576HVSX-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVSX-15 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-15?
For technical support, including LM2576HVSX-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVSX-15 requirements.
6.How does Aetrix verify that LM2576HVSX-15 is sourced from the original manufacturer or authorized distributors?
All LM2576HVSX-15 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-15 meets industry standards.
7.What is the process for return or replacement of LM2576HVSX-15?
All LM2576HVSX-15 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVSX-15, 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-15 part is unused and in its original packaging.
Return procedure for LM2576HVSX-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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