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Texas Instruments LM2576HVT-5.0/LF03
- Part No.:
- LM2576HVT-5.0/LF03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576HVT-5.0/LF03.pdf
- Description:
- IC REG BUCK 5V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:142
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Product details
Overview
LM2576HVT-5.0/LF03 from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-220 (KC) package, delivering fixed 5.0 V output with ±4% tolerance over line and load, 40–60 V input range, and 52-kHz fixed-frequency operation. It integrates power switch, error amplifier, oscillator, and thermal/current protection for industrial power conversion.
For engineers reviewing the LM2576HVT-5.0/LF03 datasheet, LM2576HVT-5.0/LF03 pinout, LM2576HVT-5.0/LF03 application, or LM2576HVT-5.0/LF03 equivalent, key selection considerations include HV input capability (60 V max), TTL-compatible ON/OFF control, cycle-by-cycle current limiting (4.2–6.9 A), thermal shutdown, and minimal external component count (4 parts).
Technical Context
The LM2576HVT-5.0/LF03 implements a fixed-frequency buck topology with internal 52-kHz oscillator, bandgap reference (1.23 V), and comparator-based PWM control. Its high-side NPN transistor operates with saturation voltage of 1.4–2.0 V at 3 A, enabling efficient regulation across wide input ranges.
Functional modes include active regulation (ON/OFF pin <1.2 V), shutdown (<50 µA standby), and fault protection via cycle-by-cycle current limit and thermal shutdown. Feedback is internally tied to output for fixed 5-V versions-no external divider required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full operating temperature (−40°C to +125°C) and load (0.5–3 A), ensuring stable logic supply without trimming. |
| Input Voltage Range | 8–60 V (HV version), supporting 48-V telecom, industrial 24/48-V rails, and automotive cold-crank scenarios without pre-regulation. |
| Output Current | 3-A continuous DC load capability with built-in cycle-by-cycle current limiting (typ. 5.8 A), eliminating need for external current-sense circuitry. |
| Switching Frequency | 52 kHz ±10%, enabling use of low-cost, high-saturation-current inductors and reducing EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 77% at VIN = 12 V, IOUT = 3 A - optimized for medium-power applications where thermal management favors lower switching losses over high-frequency operation. |
| Standby Current | 50 µA typical at ON/OFF = 5 V, enabling low-power system-level sleep modes without auxiliary LDOs. |
| Thermal Resistance | RθJA = 32.4°C/W (KC package), permitting 3-A operation up to +85°C ambient with minimal heatsink area (≈1 in² copper). |
Pinout & Package
LM2576HVT-5.0/LF03 uses the KC (TO-220, 5-pin) package with 10.16 mm × 8.51 mm body size and thermally enhanced metal tab connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | High-side switch collector input | Accepts 8–60 V unregulated DC; requires short-path, low-ESR input capacitor (≥100 µF) to minimize voltage spikes during switching. |
| 2 - OUTPUT | Switch emitter output node | Drives external inductor and catch diode; high dv/dt switching node requiring tight layout and ground plane separation. |
| 3 - GROUND | Power and signal reference | Common return for input cap, feedback path, and thermal tab; must be low-impedance connection to minimize noise and thermal resistance. |
| 4 - FEEDBACK | Internal voltage sense input | Internally connected to output for fixed 5-V version - no external resistor divider needed; floating or misconnected causes regulation failure. |
| 5 - ON/OFF | TTL-compatible enable control | Logic-low (<1.2 V) enables regulation; logic-high (>1.4 V) disables with 50 µA standby - supports microcontroller-controlled power sequencing. |
| TAB | Thermal and electrical ground | Electrically tied to GND; soldered to PCB copper pour for thermal relief - critical for sustaining 3-A loads at elevated ambient temperatures. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-A power switch | Eliminates need for external MOSFET and gate driver, reducing BOM count and layout complexity in space-constrained designs. |
| Fixed 5-V output with internal feedback | Removes external resistor network, improving accuracy and long-term stability while simplifying design validation and production test. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI profile and compatibility with standard off-the-shelf inductors rated for ≤100 kHz operation. |
| Cycle-by-cycle current limiting | Provides robust overload and short-circuit protection without external sensing, preventing inductor saturation and thermal runaway. |
| TTL-compatible ON/OFF control | Allows direct interfacing with 3.3-V or 5-V logic without level-shifting, supporting flexible power sequencing in multi-rail systems. |
Applications
| Industrial Motor Drives | Server PSU Auxiliary Rails |
|---|---|
|
Use Scenario: Powering gate drivers, sensors, and MCU peripherals in 24/48-V motor control inverters. IC Role / Device Role / Timing Role: Primary 5-V buck regulator supplying isolated logic and analog circuitry downstream of main DC bus. Use Value: 60-V HV rating withstands back-EMF transients; 3-A output supports multiple gate drivers simultaneously without derating. |
Use Scenario: Generating 5-V standby and auxiliary rails in merchant server power supplies. IC Role / Device Role / Timing Role: Secondary regulation stage converting 12-V intermediate bus to clean 5-V for BMC, fan controllers, and memory buffers. Use Value: 50-µA standby current meets Energy Star PSUs' low-power idle requirements; TO-220 package allows easy heatsink integration on crowded PCBs. |
| Test Equipment Power Modules | Appliance Control Boards |
|
Use Scenario: Providing stable 5-V supply for precision ADCs, DACs, and FPGA I/O banks in benchtop instruments. IC Role / Device Role / Timing Role: Low-noise, regulated DC source with minimal external components to preserve signal integrity in mixed-signal subsystems. Use Value: ±4% output tolerance ensures accurate reference voltage generation; fixed frequency simplifies EMI filtering for CE/FCC compliance. |
Use Scenario: Powering microcontrollers, displays, and relay drivers in washing machines, HVAC controls, and smart kitchen appliances. IC Role / Device Role / Timing Role: Main system regulator converting rectified AC or battery-derived DC into reliable 5-V logic rail. Use Value: Thermal shutdown and current limit protect against sustained overloads (e.g., jammed motors); TO-220 mechanical robustness suits high-vibration environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576T-5.0 | Standard-voltage version (max 40 V input) vs. HV 60 V; identical pinout, package, and 5-V output spec. | Suitable only for ≤40 V input systems (e.g., 24-V industrial); not rated for 48-V telecom or automotive cold-crank. | Select LM2576T-5.0 when input never exceeds 40 V - lower cost, same footprint and design reuse. |
| LM2596T-5.0 | Higher 150-kHz switching frequency, smaller inductor size, but lower 4.5-A current limit and no HV option. | Better suited for compact consumer electronics; lacks 60-V rating and thermal performance margin for industrial 3-A loads. | Choose LM2596T-5.0 only if board space is critical and input stays ≤40 V - verify thermal performance at full 3-A load. |
Compared with LM2576T-5.0, LM2576HVT-5.0/LF03 adds 20-V headroom for transient-tolerant designs; versus LM2596T-5.0, it trades higher-frequency efficiency for superior thermal robustness and HV reliability in demanding environments.
Availability
LM2576HVT-5.0/LF03 is available at Aetrix Electronics and suitable for industrial motor drives, server PSU auxiliary rails, and appliance control boards requiring stable component supply with long lifecycle support.
Supply support for LM2576HVT-5.0/LF03 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 high-reliability power conversion solutions.
The LM2576 series was designed as a drop-in, high-efficiency replacement for linear regulators in medium-power industrial and commercial applications - prioritizing simplicity, thermal resilience, and fault protection over ultra-high frequency or synchronous efficiency.
FAQ
What is the maximum input voltage rating for LM2576HVT-5.0/LF03?
The LM2576HVT-5.0/LF03 supports a maximum input voltage of 60 V, confirmed in the Absolute Maximum Ratings table (63 V transient). This HV rating distinguishes it from the standard LM2576 (40 V max) and enables use in 48-V systems with margin for load-dump transients. Always maintain input below 60 V during normal operation per Recommended Operating Conditions.
Does LM2576HVT-5.0/LF03 require external feedback resistors?
No - LM2576HVT-5.0/LF03 is a fixed 5.0-V output variant with internal feedback network. Pin 4 (FEEDBACK) is internally connected to the output; connecting external resistors will disrupt regulation. This differs from the adjustable LM2576HV-ADJ, which requires an external R1/R2 divider to set VOUT.
What thermal performance can be expected from LM2576HVT-5.0/LF03 in TO-220 package?
In the KC (TO-220) package, LM2576HVT-5.0/LF03 has RθJA = 32.4°C/W. At 3-A load and 12-V input, typical power dissipation is ~2.1 W; this yields ~68°C junction rise above ambient. With 25°C ambient and proper heatsinking (≥1 in² copper), junction temperature remains within the 125°C limit - verified in TI's thermal characterization data.
How does the ON/OFF pin function on LM2576HVT-5.0/LF03?
The ON/OFF pin (Pin 5) provides TTL-compatible enable control: logic-low (<1.2 V) enables regulation; logic-high (>1.4 V) disables the device with 50 µA typical standby current. Do not leave this pin floating - tie to GND via 10-kΩ resistor for always-on operation or drive directly from MCU GPIO for controlled power sequencing.
Is LM2576HVT-5.0/LF03 RoHS-compliant and lead-free?
Yes - LM2576HVT-5.0/LF03 carries the "/LF03" suffix, indicating lead-free (Pb-free) packaging per JEDEC J-STD-609 and RoHS Directive 2011/65/EU. The TO-220 package uses matte tin (Sn) lead finish, and the device meets TI's green chemistry requirements for halogen-free substrates and molding compounds.
LM2576HVT-5.0/LF03 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- 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):
- 5V
- 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-5.0/LF03 FAQ
1.How can I place an order for LM2576HVT-5.0/LF03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVT-5.0/LF03 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-5.0/LF03 reliable?
The price and inventory of LM2576HVT-5.0/LF03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576HVT-5.0/LF03 is usually 5 days.
3.What payment methods are accepted for LM2576HVT-5.0/LF03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVT-5.0/LF03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVT-5.0/LF03?
LM2576HVT-5.0/LF03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVT-5.0/LF03 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-5.0/LF03?
For technical support, including LM2576HVT-5.0/LF03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVT-5.0/LF03 requirements.
6.How does Aetrix verify that LM2576HVT-5.0/LF03 is sourced from the original manufacturer or authorized distributors?
All LM2576HVT-5.0/LF03 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-5.0/LF03 meets industry standards.
7.What is the process for return or replacement of LM2576HVT-5.0/LF03?
All LM2576HVT-5.0/LF03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVT-5.0/LF03, 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-5.0/LF03 part is unused and in its original packaging.
Return procedure for LM2576HVT-5.0/LF03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2576HVT-5.0/LF03 Tags
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