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Texas Instruments LM2576HVT-5.0
- Part No.:
- LM2576HVT-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2576HVT-5.0.pdf
- Description:
- IC REG BUCK 5V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,322
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Product details
Overview
LM2576HVT-5.0 from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-220-5 (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, oscillator, error amplifier, and protection circuitry for buck conversion in industrial power supplies and motor drives.
For engineers reviewing the LM2576HVT-5.0 datasheet, LM2576HVT-5.0 pinout, LM2576HVT-5.0 application, or LM2576HVT-5.0 equivalent, key selection criteria include HV input capability (60 V max), thermal performance in TO-220 package (RθJA = 32.4°C/W), shutdown current (50 µA typ), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576HVT-5.0 implements a fixed-frequency PWM control architecture with internal 52-kHz oscillator and cycle-by-cycle peak current limiting. Its non-synchronous design uses an external catch diode and requires only four external components: input capacitor, output capacitor, inductor, and feedback network (shorted for fixed-output versions).
Functional modes include active regulation (ON/OFF pin <1.2 V), shutdown (ON/OFF pin >1.4 V), and fault protection via thermal shutdown and current limit (ICL = 4.2–6.9 A). The device operates across −40°C to +125°C junction temperature with built-in undervoltage lockout behavior enabled by ON/OFF pin biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - ensures stable logic rail without external resistor divider. |
| Input Voltage Range | 8 V to 60 V - supports wide industrial input sources including 48-V telecom, unregulated AC/DC adapters, and battery systems. |
| Output Current | 3 A continuous - delivers sufficient power for microcontrollers, sensors, and peripheral ICs without external current boosting. |
| Oscillator Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Standby Current | 50 µA typical at shutdown - minimizes system-level quiescent power in always-on applications like remote monitoring nodes. |
| Thermal Resistance | RθJA = 32.4°C/W (KC package) - defines heatsink requirement: ~10°C rise at 3 A full load with 25°C ambient, enabling compact thermal design. |
| Saturation Voltage | VSAT = 1.4–2.0 V at 3 A - determines conduction loss and minimum dropout: e.g., 7 V input needed for 5 V @ 3 A under worst-case VSAT. |
| Current Limit | 4.2–6.9 A - provides robust overload protection while allowing startup surge current margin above 3-A rated output. |
Pinout & Package
LM2576HVT-5.0 is housed in a 5-pin TO-220 (KC) package with exposed tab thermally and electrically connected to GROUND. The tab must be mounted to a heatsink or large copper pour for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Connects to high-side switch collector; requires short, low-inductance path to input capacitor to minimize switching noise and voltage spikes. |
| 2 - OUTPUT | Switching node | Drives external catch diode anode and inductor; high dv/dt node requiring careful PCB layout to reduce EMI and ringing. |
| 3 - GROUND | Power and signal reference | Low-impedance return path for input/output capacitors and feedback network; must tie directly to VIN and OUTPUT capacitor grounds. |
| 4 - FEEDBACK | Regulation sense | Internally tied to 5.0 V output for fixed versions; left unconnected (open) in LM2576HVT-5.0 - no external divider required. |
| 5 - ON/OFF | Enable control | TTL-compatible shutdown: ≤1.2 V = active, ≥1.4 V = standby; 50 µA leakage allows simple pull-down resistor for always-on operation. |
| TAB | Thermal & electrical ground | Internally bonded to GROUND pin; must be soldered to heatsink or ≥1 in² copper area for optimal thermal performance. |
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 5.0 V output | Removes feedback resistor selection and trimming effort - accelerates prototyping and ensures consistent output across production units. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI profile and simplifies filter design using standard low-frequency magnetics instead of costly RF-grade inductors. |
| Cycle-by-cycle current limiting | Prevents catastrophic failure during short-circuit or overload by clamping peak inductor current before thermal runaway occurs. |
| TTL-compatible ON/OFF control | Supports direct interfacing with microcontroller GPIO or system power sequencer without level-shifting circuitry. |
| Thermal shutdown protection | Automatically disables switching if junction temperature exceeds 150°C, preventing permanent damage during sustained overload or poor heatsinking. |
Applications
| Industrial Motor Drive Power Supply | Merchant Server PSU Auxiliary Rail |
|---|---|
Use Scenario: Provides isolated 5-V logic supply for gate drivers and MCU in 24–48-V DC-fed brushless motor controllers. IC Role / Device Role / Timing Role: Primary buck regulator generating clean, regulated 5-V rail from unregulated bus; operates at fixed 52-kHz frequency to avoid audible noise in fan-cooled enclosures. Use Value: Delivers 3-A continuous current with <2% load regulation, enabling simultaneous powering of multiple gate drivers and communication interfaces without voltage droop. | Use Scenario: Generates 5-V standby rail in multi-output server power supplies where main 12-V rail powers CPUs and memory. IC Role / Device Role / Timing Role: Secondary non-isolated buck converter operating from 12-V intermediate bus; leverages 60-V HV rating to tolerate transient overshoot on shared bus. Use Value: Achieves >77% efficiency at 3-A load with minimal external components, reducing board area and cost versus linear regulators or discrete switchers. |
| Appliance Main Control Board | Test Equipment Digital I/O Power |
Use Scenario: Powers microcontroller, display, and sensor interface circuits in washing machines and HVAC controllers with wide-input AC/DC adapter outputs. IC Role / Device Role / Timing Role: Fixed-output step-down regulator accepting 36–56-V rectified inputs; uses ON/OFF pin for soft-start sequencing with main system controller. Use Value: Maintains ±4% output accuracy across −40°C to +85°C ambient, ensuring reliable ADC reference and communication timing in variable-temperature environments. | Use Scenario: Supplies 5-V digital logic for FPGA-based test fixtures requiring precise timing and low-noise operation during signal generation and capture. IC Role / Device Role / Timing Role: Low-ripple buck regulator feeding FPGA I/O banks and level translators; benefits from fixed-frequency operation for deterministic jitter control. Use Value: Delivers <50-mVpp output ripple with standard 100-µF electrolytic + 10-µF ceramic output capacitance, meeting FPGA core I/O noise floor requirements. |
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 (40 V max input) vs. HV version (60 V); identical pinout, package, and electrical specs except input rating. | Suitable for ≤40 V input systems only; not recommended for 48-V telecom or industrial buses with transients. | Select LM2576T-5.0 only when input never exceeds 40 V and cost sensitivity outweighs future-proofing against voltage surges. |
| LM2596T-5.0 | Higher 150-kHz switching frequency, lower 3-A rating, different pinout (TO-220-5 but non-compatible), and no HV variant available. | Requires smaller inductors/capacitors but increases EMI filtering burden; incompatible PCB layout due to shifted pin positions. | Choose LM2596T-5.0 only when board redesign is acceptable and higher frequency benefits (size reduction) outweigh thermal and layout trade-offs. |
Compared with LM2576T-5.0, the LM2576HVT-5.0 adds 20-V headroom for transient tolerance without changing footprint or thermal design; versus LM2596T-5.0, it trades higher frequency for proven ruggedness, simpler EMI compliance, and drop-in replacement capability in legacy LM2576 layouts.
Availability
LM2576HVT-5.0 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.
Supply support for LM2576HVT-5.0 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, designing and manufacturing analog and embedded processing products for industrial, automotive, and consumer markets.
The LM2576 series belongs to TI's SIMPLE SWITCHER® power converter family, engineered for ease-of-use in cost-sensitive, medium-power DC-DC applications where reliability, thermal robustness, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for LM2576HVT-5.0?
The LM2576HVT-5.0 supports a maximum input voltage of 60 V, confirmed in the Absolute Maximum Ratings table and Recommended Operating Conditions section of the official datasheet. This HV rating distinguishes it from the standard LM2576T-5.0 (40 V max) and enables use in 48-V systems with transient margin. Operation beyond 60 V risks permanent damage per TI's stress-rating guidance.
Does LM2576HVT-5.0 require external feedback resistors?
No, the LM2576HVT-5.0 is a fixed-output version with internal feedback divider set to 5.0 V. Pin 4 (FEEDBACK) is internally connected to the output and must be left unconnected - unlike the adjustable LM2576HV-ADJ, which requires external R1/R2. This eliminates resistor tolerance errors and simplifies layout for consistent 5-V regulation.
How does the ON/OFF pin function on LM2576HVT-5.0?
The ON/OFF pin (Pin 5) provides TTL-compatible enable control: pulling it ≤1.2 V activates regulation, while ≥1.4 V places LM2576HVT-5.0 in shutdown mode with 50 µA typical standby current. Leaving it floating is prohibited; a 10-kΩ pull-down resistor to GND ensures default-on operation. This pin supports system-level power sequencing and low-power sleep states.
What thermal performance can be expected from LM2576HVT-5.0 in its TO-220 package?
In the KC (TO-220-5) package, LM2576HVT-5.0 has RθJA = 32.4°C/W under JEDEC 4-layer board conditions. With 3-A load and 12-V input, typical power dissipation is ~2.1 W, resulting in ~68°C junction rise above ambient. Mounting the tab to a 25 cm² heatsink reduces RθJA to ~20°C/W, keeping TJ within 125°C limit at full load and 70°C ambient.
Can LM2576HVT-5.0 replace LM2576T-5.0 without PCB changes?
Yes, LM2576HVT-5.0 is pin-compatible and footprint-compatible with LM2576T-5.0 in the same KC (TO-220-5) package. Both share identical pinout, thermal pad connection, and electrical behavior except for the extended 60-V input rating. No PCB modifications are needed - upgrading to LM2576HVT-5.0 improves surge immunity while maintaining full functional and mechanical interchangeability.
LM2576HVT-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-220-5
- 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):
- 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 FAQ
1.How can I place an order for LM2576HVT-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVT-5.0 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 reliable?
The price and inventory of LM2576HVT-5.0 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 is usually 5 days.
3.What payment methods are accepted for LM2576HVT-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVT-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVT-5.0?
LM2576HVT-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVT-5.0 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?
For technical support, including LM2576HVT-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVT-5.0 requirements.
6.How does Aetrix verify that LM2576HVT-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2576HVT-5.0 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 meets industry standards.
7.What is the process for return or replacement of LM2576HVT-5.0?
All LM2576HVT-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVT-5.0, 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 part is unused and in its original packaging.
Return procedure for LM2576HVT-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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