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Texas Instruments LM2575HVT-12/LB03
- Part No.:
- LM2575HVT-12/LB03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2575HVT-12/LB03.pdf
- Description:
- IC REG BUCK 12V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
LM2575HVT-12/LB03 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in a 5-lead TO-220 package, delivering a fixed 12V output with ±4% tolerance across 15V–60V input range, 88% peak efficiency at 15VIN/1A, and integrated thermal shutdown, cycle-by-cycle current limiting, and 52 kHz fixed-frequency oscillator. It replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the LM2575HVT-12/LB03 datasheet, LM2575HVT-12/LB03 pinout, LM2575HVT-12/LB03 application, or LM2575HVT-12/LB03 equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated TO-220 pin functions, confirmed alternative parts with functional differences, and supply-chain support details specific to this HV-series 12V regulator.
Technical Context
The LM2575HVT-12/LB03 implements a fixed-frequency PWM buck topology with internal NPN switch, feedback comparator referenced to 1.23V, and self-protecting oscillator that drops to ~18 kHz under short-circuit conditions. Its 98% max duty cycle enables operation down to 15VIN while maintaining regulation at 12VOUT.
It requires only four external components: input capacitor, output capacitor, catch diode, and power inductor - all optimized for 52 kHz operation. The device uses TTL-compatible ON/OFF control (1.4VH, 1.2VL) and draws just 50 μA standby current when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% over 0.2–1A load and 15–60V input - ensures stable rail for 12V logic, sensors, and analog circuitry without trimming. |
| Input Voltage Range | 15V to 60V - supports wide-input industrial, automotive battery, and telecom applications where input varies significantly. |
| Max Output Current | 1A continuous - sufficient to power microcontrollers, displays, and peripheral ICs without external current boosting. |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, standard off-the-shelf inductors (e.g., PE-52627, 330 µH) and simplifies EMI filtering. |
| Efficiency | 88% at 15VIN/1A - reduces thermal load vs. linear regulators, often eliminating need for heatsink in ambient ≤50°C. |
| Thermal Resistance | θJA = 45°C/W (with 4 in² copper) - defines PCB copper area requirement to maintain TJ ≤125°C at full load. |
| Standby Current | 50 µA typical - enables low-power system sleep modes without compromising fast wake-up response. |
Pinout & Package
LM2575HVT-12/LB03 is housed in a 5-lead TO-220 package (Package Number NDH0005D), with tab electrically connected to Pin 2 (Output) and designed for vertical mounting on PCB or socket. Thermal performance depends on copper area: θJA = 65°C/W (minimal copper), 45°C/W (4 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Unregulated DC input supply | Accepts 15–60V; requires ≥47 µF low-ESR aluminum electrolytic capacitor placed within 1 cm for stability. |
| 2 - Output | Regulated 12V DC output | Connected to tab; drives 1A load; requires ≥330 µF output capacitor and Schottky catch diode (e.g., SR103). |
| 3 - Ground | Power and signal reference | Must be single-point grounded near input/output capacitors to minimize noise coupling into feedback path. |
| 4 - Feedback | Output voltage sensing node | Internally tied to 12V output; not accessible - fixed-voltage version eliminates external resistor divider. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic high (>1.4V) enables regulation; logic low (<1.2V) disables output and reduces quiescent current to 50 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Activates at TJ ≥150°C and latches off until cooldown - prevents permanent damage during overload or poor heatsinking. |
| Cycle-by-cycle current limit | Peak switch current limited to 1.7–3.2A - protects internal NPN transistor and external diode/inductor during transient shorts. |
| Fixed 52 kHz oscillator | Enables predictable EMI spectrum and eliminates need for external timing components - simplifies layout and BOM. |
| Low-component-count design | Only 4 external parts required (CIN, COUT, DCATCH, L) - reduces bill-of-materials cost and board space vs. controller-based solutions. |
| High-voltage input rating | 60V max operating input (63V absolute max) - supports 48V systems, PoE-powered equipment, and unregulated industrial rails. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24V truck battery to stable 12V for microcontroller, CAN transceiver, and sensor interface. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 12V rail with built-in fault protection. Use Value: Withstands cold-crank dips to 15V and load-dump surges up to 60V, eliminating need for upstream TVS or pre-regulator. |
Use Scenario: On-board 12V supply for door module MCU, window motor driver, and LED status indicators. IC Role / Device Role / Timing Role: Compact, self-contained DC-DC converter replacing discrete transistor+linear regulator combinations. Use Value: 88% efficiency minimizes heat in sealed plastic housing; 50 µA standby enables always-on wake-up capability. |
| Telecom Remote Terminal Unit | Test Equipment Auxiliary Rail |
|
Use Scenario: Deriving clean 12V from -48V telecom plant via buck-boost configuration using LM2575HVT-12/LB03. IC Role / Device Role / Timing Role: Core switching element in positive-to-negative converter topology (inverting buck-boost). Use Value: Fixed 12V output eliminates feedback resistor calibration; 52 kHz frequency allows small magnetics in space-constrained enclosures. |
Use Scenario: Benchtop instrument requiring low-noise, reliable 12V supply for analog front-end and ADC reference. IC Role / Device Role / Timing Role: Pre-regulator feeding low-dropout linear regulator to achieve <10 mV ripple and high PSRR. Use Value: High efficiency reduces thermal drift in precision measurement circuits; ON/OFF pin enables synchronized power 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 |
|---|---|---|---|
| LM2575T-12 | Standard-voltage version: max input 40V (vs. 60V); same pinout, package, and 12V output spec. | Not suitable for >40V input systems (e.g., 48V telecom, industrial 60V rails). | Select LM2575T-12 only if input never exceeds 40V and cost sensitivity outweighs HV margin. |
| LM2596-12 | Higher 3A output, 150 kHz switching, adjustable feedback (requires external resistors); different pinout and package (TO-220-5 but non-interchangeable). | Requires redesign of feedback network, inductor, and layout; supports higher current but adds complexity. | Choose LM2596-12 only when >1A load or tighter regulation (±2%) is required - not a drop-in replacement. |
Compared with LM2575T-12, LM2575HVT-12/LB03 provides critical 20V higher input headroom for robustness in harsh environments; versus LM2596-12, it offers simpler implementation and proven reliability in legacy designs, albeit at lower current and fixed output.
Availability
LM2575HVT-12/LB03 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom remote terminals, and test equipment requiring stable component supply with long lifecycle assurance.
Supply support for LM2575HVT-12/LB03 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 ICs, with decades of expertise in switching regulator design and manufacturing.
LM2575HVT-12/LB03 belongs to the SIMPLE SWITCHER® family - engineered for ease of use in cost-sensitive, high-reliability DC-DC conversion applications where minimal external components and proven thermal behavior are essential.
FAQ
What is the maximum input voltage rating for LM2575HVT-12/LB03?
The LM2575HVT-12/LB03 has a maximum operating input voltage of 60V and an absolute maximum rating of 63V. This high-voltage capability distinguishes it from the standard LM2575 series (40V max) and makes it suitable for 48V systems, industrial battery inputs, and applications subject to load dump transients. Exceeding 60V during normal operation risks violating specifications and reducing reliability.
Does LM2575HVT-12/LB03 require external feedback resistors?
No, LM2575HVT-12/LB03 does not require external feedback resistors. As a fixed-output variant, its 12V regulation is implemented internally - Pin 4 (Feedback) is not user-accessible and is pre-connected to the output. This eliminates resistor tolerance errors, temperature drift, and layout sensitivity associated with adjustable versions, improving long-term output accuracy and simplifying design.
Can LM2575HVT-12/LB03 be used in a buck-boost (inverting) configuration?
Yes, LM2575HVT-12/LB03 can be configured as a positive-to-negative buck-boost converter per TI Application Note SLVA017. In this topology, the IC regulates the magnitude of the negative output (e.g., –12V) while referencing ground. The fixed 12V output version maintains regulation without feedback adjustment, though external diode, inductor, and capacitor values must follow the inverting design procedure.
What thermal management is required for LM2575HVT-12/LB03 at full 1A load?
At 1A output and 60V input, LM2575HVT-12/LB03 dissipates ~48W worst-case. With θJA = 45°C/W (4 in² copper), junction temperature rise is ~2160°C - impractical. Realistically, operation at full load requires VIN ≤24V and ≥4 in² copper pour plus optional heatsink. For 60V input, derating to ≤0.3A is recommended unless actively cooled. Always verify TJ < 125°C in final layout.
Is LM2575HVT-12/LB03 RoHS compliant and lead-free?
Yes, LM2575HVT-12/LB03 is RoHS compliant and lead-free per Texas Instruments' packaging standards. The "LB03" suffix indicates lead-free finish and tape-and-reel packaging. Full compliance documentation, including material declarations and test reports, is available in TI's official product folder and through authorized distributors' quality portals.
LM2575HVT-12/LB03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- 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:
- 1A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2575HVT-12/LB03 FAQ
1.How can I place an order for LM2575HVT-12/LB03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575HVT-12/LB03 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 LM2575HVT-12/LB03 reliable?
The price and inventory of LM2575HVT-12/LB03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575HVT-12/LB03 is usually 5 days.
3.What payment methods are accepted for LM2575HVT-12/LB03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575HVT-12/LB03 transactions.
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4.How is shipping managed for LM2575HVT-12/LB03?
LM2575HVT-12/LB03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575HVT-12/LB03 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 LM2575HVT-12/LB03?
For technical support, including LM2575HVT-12/LB03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575HVT-12/LB03 requirements.
6.How does Aetrix verify that LM2575HVT-12/LB03 is sourced from the original manufacturer or authorized distributors?
All LM2575HVT-12/LB03 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 LM2575HVT-12/LB03 meets industry standards.
7.What is the process for return or replacement of LM2575HVT-12/LB03?
All LM2575HVT-12/LB03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575HVT-12/LB03, 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 LM2575HVT-12/LB03 part is unused and in its original packaging.
Return procedure for LM2575HVT-12/LB03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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