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Texas Instruments LM2576HVT-15/LB03
- Part No.:
- LM2576HVT-15/LB03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576HVT-15/LB03.pdf
- Description:
- IC REG BUCK 15V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,297
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Product details
Overview
LM2576HVT-15/LB03 from Texas Instruments is a non-synchronous step-down DC-DC switching regulator delivering up to 3 A output current with fixed 15 V output, 52 kHz fixed-frequency operation, ±4% output voltage tolerance over line and load, and 60 V maximum input voltage rating. It serves as a high-efficiency replacement for linear regulators in industrial power supplies requiring stable mid-voltage rails.
For engineers reviewing the LM2576HVT-15/LB03 datasheet, LM2576HVT-15/LB03 pinout, LM2576HVT-15/LB03 application, or LM2576HVT-15/LB03 equivalent, key selection considerations include its HV-rated input range (up to 60 V), thermal shutdown and cycle-by-cycle current limiting, TO-220-5 package with integrated ground tab, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576HVT-15/LB03 implements a monolithic buck converter architecture with an internal 3-A NPN switch, fixed 52 kHz oscillator, and built-in error amplifier with 1.23 V reference. Its feedback loop uses direct connection of the FEEDBACK pin to the output capacitor for fixed-output versions, eliminating external resistor dividers.
It operates in active mode when the ON/OFF pin voltage is below 1.2 V, entering shutdown with 50 µA standby current when the pin exceeds 1.4 V. Cycle-by-cycle current limiting triggers at 4.2–6.9 A typical, and thermal shutdown activates at 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over full line/load/temperature range - ensures stable rail for logic, analog, or motor control without external adjustment. |
| Max Input Voltage | 60 V - supports wide-input industrial, automotive, or telecom supply rails without pre-regulation. |
| Output Current | 3 A continuous - sufficient for powering multiple ICs, small motors, or sensor subsystems from a single regulator. |
| Oscillator Frequency | 52 kHz (42–63 kHz over temp) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Efficiency | 88% at VIN = 18 V, IOUT = 3 A - minimizes thermal dissipation versus linear regulators, reducing heatsink requirements. |
| Standby Current | 50 µA typical - enables low-power system-level shutdown without auxiliary circuitry. |
| Thermal Resistance | RθJA = 32.4 °C/W (KC package) - defines heatsink sizing requirement under worst-case ambient conditions. |
Pinout & Package
LM2576HVT-15/LB03 is housed in the KC (TO-220-5) package with 10.16 mm × 8.51 mm body size and electrically connected metal tab tied to GROUND for thermal and electrical integrity.
| 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 minimize switching noise and voltage spikes. |
| 2 - OUTPUT | Switching node | Emitter of internal NPN switch; connects directly to inductor and catch diode cathode - critical for EMI layout and thermal management. |
| 3 - GROUND | Power return | Main power ground reference; shortest possible trace to CIN ground to maintain stability and reduce noise coupling. |
| 4 - FEEDBACK | Voltage sense | Internally connected to output for fixed 15 V version; no external divider needed - simplifies design and improves regulation accuracy. |
| 5 - ON/OFF | Enable control | TTL-compatible shutdown input; <1.2 V enables regulation, >1.4 V disables with 50 µA standby - supports system-level power sequencing. |
| TAB | Thermal & electrical ground | Internally bonded to GROUND; must be soldered to large copper pour or heatsink for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-A NPN switch | Eliminates need for external MOSFET and gate driver, reducing BOM count and layout complexity in medium-power buck designs. |
| Cycle-by-cycle current limiting | Protects against short-circuit and overload faults without external sensing, maintaining reliability across varying load conditions. |
| Thermal shutdown | Automatically disables regulation at 150 °C junction temperature, preventing permanent damage during sustained overload or poor heatsinking. |
| Fixed 15 V output configuration | Removes feedback resistor selection errors and drift, ensuring consistent 15 V rail accuracy across production batches and temperature. |
| 52 kHz fixed-frequency oscillator | Enables predictable EMI spectrum placement and simplifies filter design compared to variable-frequency controllers. |
Applications
| Industrial Motor Drive Power Supply | Test Equipment Main Rail Generator |
|---|---|
Use Scenario: Powers gate drivers, op-amps, and microcontrollers in 24 V DC-fed brushless motor drives. IC Role / Device Role / Timing Role: Primary 15 V intermediate rail generator replacing linear regulators to reduce heat and improve efficiency. Use Value: Delivers 3 A at 88% efficiency with 60 V max input, enabling direct connection to unregulated industrial bus without pre-conversion. | Use Scenario: Supplies stable 15 V to precision DACs, ADC references, and signal conditioning circuits in benchtop multimeters. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing low-noise, well-regulated bias for analog front-ends. Use Value: ±4% output tolerance and low ripple (with proper LC filtering) meet metrology-grade voltage stability requirements. |
| Merchant Server PSU Auxiliary Rail | Appliance Control Board Power |
Use Scenario: Generates 15 V auxiliary rail for fan controllers, SMBus interfaces, and LED indicators in 48 V server power distribution units. IC Role / Device Role / Timing Role: Secondary buck regulator stepping down from main 48 V bus to isolated 15 V domain. Use Value: 60 V input rating allows direct use on 48 V systems with margin; TO-220 package enables manual assembly and field repairability. | Use Scenario: Powers MCU, display backlight drivers, and relay coils in smart washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Main system power IC converting rectified AC or battery input to regulated 15 V for mixed-signal loads. Use Value: Built-in thermal and current protection ensures robust operation in thermally constrained enclosures without additional supervision circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-15 | Standard-voltage version (40 V max input) vs. HV version (60 V); identical pinout, package, and 15 V output spec. | Suitable only where input never exceeds 40 V; lower cost but insufficient for 48 V or transient-heavy industrial inputs. | Select LM2576HVT-15/LB03 when input may reach 48–60 V; choose LM2576T-15 for cost-sensitive 24 V or lower-input designs. |
| LM2596T-15 | Higher switching frequency (150 kHz), lower quiescent current (5 mA vs. 10 mA), but lower max output current (3 A vs. 3 A same, though derated at high temp). | Better suited for compact layouts due to smaller magnetics; less thermally robust in sustained 3 A operation without heatsink. | Prefer LM2576HVT-15/LB03 for high-reliability, high-temp, or high-input-voltage applications; LM2596T-15 fits space-constrained consumer designs. |
Compared with LM2576T-15 and LM2596T-15, LM2576HVT-15/LB03 uniquely combines 60 V input capability, proven industrial thermal robustness in TO-220, and long-term supply stability - making it optimal for legacy-compatible, high-margin power designs where input transients or extended temperature operation are concerns.
Availability
LM2576HVT-15/LB03 is available at Aetrix Electronics and suitable for industrial motor drives, test equipment power supplies, merchant server auxiliary rails, and appliance control boards requiring stable component supply and long-lifecycle support.
Supply support for LM2576HVT-15/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 company specializing in analog, embedded processing, and power management technologies, with leadership in industrial, automotive, and enterprise applications.
The LM2576xx series was designed as a rugged, easy-to-use SIMPLE SWITCHER® solution for medium-power DC-DC conversion where reliability, minimal external components, and wide input range outweigh the need for synchronous efficiency or ultra-small footprint.
FAQ
What is the maximum input voltage rating for LM2576HVT-15/LB03?
The LM2576HVT-15/LB03 has a maximum input voltage rating of 60 V, confirmed in the Absolute Maximum Ratings table and Recommended Operating Conditions section of the TI datasheet. This HV rating distinguishes it from the standard LM2576 (40 V max) and enables direct use with 48 V systems, PoE++ infrastructure, or industrial buses with transient margins. Exceeding 60 V risks permanent damage.
Does LM2576HVT-15/LB03 require external feedback resistors?
No, LM2576HVT-15/LB03 does not require external feedback resistors. As a fixed-output 15 V variant, its FEEDBACK pin is internally connected to the output stage. The datasheet specifies direct connection of Pin 4 to the output capacitor - eliminating resistor selection errors, temperature drift, and layout sensitivity associated with adjustable versions.
What package type is used for LM2576HVT-15/LB03?
LM2576HVT-15/LB03 uses the KC package - a 5-pin TO-220 variant with 10.16 mm × 8.51 mm body size and an electrically connected metal tab tied to GROUND. This package provides mechanical robustness, straightforward heatsinking via the tab, and compatibility with through-hole assembly processes common in industrial manufacturing.
How does the ON/OFF pin function on LM2576HVT-15/LB03?
The ON/OFF pin (Pin 5) of LM2576HVT-15/LB03 provides TTL-compatible enable control: pulling it below 1.2 V activates regulation, while raising it above 1.4 V places LM2576HVT-15/LB03 in shutdown mode with 50 µA typical standby current. The pin must never be left floating - tie to GND for always-on operation or drive with a logic signal for controlled power sequencing.
What protection features are integrated into LM2576HVT-15/LB03?
LM2576HVT-15/LB03 integrates cycle-by-cycle current limiting (triggering at 4.2–6.9 A), thermal shutdown (activating at 150 °C junction temperature), and undervoltage lockout (inherent in startup behavior). These protections operate autonomously without external components, ensuring safe operation during output shorts, overloads, or inadequate heatsinking - critical for unattended industrial deployments.
LM2576HVT-15/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):
- 15V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- 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
LM2576HVT-15/LB03 FAQ
1.How can I place an order for LM2576HVT-15/LB03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVT-15/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 LM2576HVT-15/LB03 reliable?
The price and inventory of LM2576HVT-15/LB03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576HVT-15/LB03 is usually 5 days.
3.What payment methods are accepted for LM2576HVT-15/LB03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVT-15/LB03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVT-15/LB03?
LM2576HVT-15/LB03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVT-15/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 LM2576HVT-15/LB03?
For technical support, including LM2576HVT-15/LB03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVT-15/LB03 requirements.
6.How does Aetrix verify that LM2576HVT-15/LB03 is sourced from the original manufacturer or authorized distributors?
All LM2576HVT-15/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 LM2576HVT-15/LB03 meets industry standards.
7.What is the process for return or replacement of LM2576HVT-15/LB03?
All LM2576HVT-15/LB03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVT-15/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 LM2576HVT-15/LB03 part is unused and in its original packaging.
Return procedure for LM2576HVT-15/LB03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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