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Texas Instruments LM2576HVT-12/LF03
- Part No.:
- LM2576HVT-12/LF03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576HVT-12/LF03.pdf
- Description:
- IC REG BUCK 12V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:198
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Product details
Overview
LM2576HVT-12/LF03 from Texas Instruments is a non-synchronous step-down DC-DC switching regulator delivering up to 3 A at fixed 12 V output, with 40–60 V wide input range (HV version), ±4% output voltage tolerance over line/load/temperature, and 52 kHz fixed-frequency operation. It serves as a high-efficiency replacement for linear regulators in industrial power supplies requiring robust thermal performance and minimal external components.
For engineers reviewing the LM2576HVT-12/LF03 datasheet, LM2576HVT-12/LF03 pinout, LM2576HVT-12/LF03 application, or LM2576HVT-12/LF03 equivalent, key selection considerations include its TO-220-5 (KC) package thermal resistance (RθJA = 32.4°C/W), cycle-by-cycle current limiting (ICL = 4.2–6.9 A), TTL-compatible ON/OFF control (ISTBY = 50 μA typical), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576HVT-12/LF03 integrates a 3-A NPN power switch, fixed 52-kHz oscillator, error amplifier, bandgap reference (1.23 V), and thermal shutdown circuitry into a monolithic buck regulator. Its architecture relies on external diode, inductor, and capacitors - no synchronous rectification - and uses voltage-mode control with feedback sampled at the output divider midpoint (shorted to VOUT for fixed versions).
It operates in continuous conduction mode under full load but transitions to discontinuous mode at light loads. Protection features include cycle-by-cycle peak current limiting, thermal shutdown, and undervoltage lockout via the ON/OFF pin, with standby current dropping to 50 μA when the pin is pulled high (>1.4 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over −40°C to +125°C, 15 V ≤ VIN ≤ 60 V, 0.5–3 A load - ensures stable rail for motor drivers or industrial logic without trimming. |
| Input Voltage Range | 40 V to 60 V (HV version) - supports unregulated 48-V telecom or industrial bus inputs with margin for transients. |
| Output Current | 3 A DC continuous - sufficient to drive multiple logic rails, small motors, or sensor subsystems without external pass devices. |
| Oscillator Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 88% at VIN = 15 V, IOUT = 3 A - cuts heat sink size by >50% versus equivalent linear regulators, enabling compact TO-220 mounting. |
| Standby Current | 50 μA typical at ON/OFF = 5 V - allows low-power system sleep modes without auxiliary LDOs or discrete switches. |
| Saturation Voltage | 1.4–2.0 V at IOUT = 3 A - defines minimum dropout (VIN(MIN) ≈ VOUT + VSAT) and impacts thermal dissipation in high-VIN applications. |
| Current Limit | 4.2–6.9 A (typical 5.8 A) - provides overload protection while allowing startup surge for capacitive loads without false triggering. |
Pinout & Package
LM2576HVT-12/LF03 is supplied in the KC package: TO-220-5 with exposed tab thermally and electrically connected to GND. The tab must be mounted to a heatsink or large copper pour for thermal management (RθJA = 32.4°C/W on JEDEC 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | High-side switch collector input | Connects directly to unregulated input supply and high-frequency bypass capacitor (CIN); shortest possible trace required to minimize switching noise and voltage spikes. |
| 2 - OUTPUT | Switch emitter node | Drives external catch diode anode and inductor; this is the high-dV/dt switching node - critical for layout EMI control and diode selection. |
| 3 - GROUND | Power and signal reference | Low-impedance return path for CIN, feedback network, and ON/OFF pull-down; must tie directly to thermal tab and minimize loop area with VIN and OUTPUT traces. |
| 4 - FEEDBACK | Voltage regulation sense input | Internally referenced to 1.23 V; shorted to VOUT for fixed 12-V operation - eliminates external resistor divider and associated drift/error. |
| 5 - ON/OFF | TTL-compatible enable control | Logic-low (≤1.2 V) enables regulation; logic-high (≥2.2 V) forces 50-μA standby - supports microcontroller-controlled power sequencing without level shifters. |
| TAB | Thermal and electrical ground | Internally bonded to GND; requires mechanical attachment to heatsink or ≥1 in² PCB copper pour to achieve rated 3-A output continuously. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output with internal feedback connection | Eliminates external resistor divider, reducing BOM count, layout area, and output voltage drift from resistor tolerance/temperature coefficients. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI spectrum placement and simplifies filter design using standard, low-DCR, high-saturation inductors (e.g., 68–100 µH). |
| Cycle-by-cycle current limiting | Prevents destructive inductor saturation during short-circuit or heavy transient loads by clamping peak switch current to ~5.8 A. |
| TTL-compatible ON/OFF pin | Allows direct interfacing with 3.3-V or 5-V microcontrollers for power sequencing, fault recovery, or low-power sleep states without external biasing. |
| Integrated thermal shutdown | Disables switching if junction temperature exceeds ~150°C, protecting the IC and downstream circuitry during sustained overload or inadequate heatsinking. |
| Wide 40–60 V input range (HV version) | Supports legacy 48-V systems, automotive cold-crank (up to 60 V), and industrial 24/48-V buses without pre-regulation stages. |
Applications
| Industrial Motor Drives | Merchant Network PSU |
|---|---|
Use Scenario: Powering gate drivers, logic controllers, and sensors in 24/48-V DC-fed brushless motor drives operating in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary 12-V buck regulator supplying isolated gate driver bias and MCU I/O rails. Use Value: Delivers 3 A at 12 V with 88% efficiency and integrated thermal shutdown, eliminating need for external current sensing or discrete thermal cutoffs. | Use Scenario: Generating auxiliary 12-V rail in multi-output server power supplies where main 12-V bus is derived from AC-DC front-end. IC Role / Device Role / Timing Role: Secondary regulated DC-DC stage providing clean, well-regulated 12-V for fan controllers, BMC, and monitoring circuits. Use Value: Fixed 12-V output with ±4% tolerance ensures compatibility with standard 12-V logic interfaces, while TO-220 package simplifies heatsink integration into dense PSU layouts. |
| Appliance Control Boards | Test & Measurement Equipment |
Use Scenario: Supplying 12-V power to display backlights, relay drivers, and microcontroller peripherals in washing machines, HVAC controllers, and smart kitchen appliances. IC Role / Device Role / Timing Role: Main DC-DC converter converting 48-V battery or rectified mains-derived bus to stable 12-V system rail. Use Value: Withstands 60-V input transients common in appliance motor commutation, and 50-μA standby current enables low-power "soft-off" modes compliant with energy regulations. | Use Scenario: Providing isolated 12-V supply for analog front-ends, ADC references, and precision op-amps in portable oscilloscopes and multimeters. IC Role / Device Role / Timing Role: Low-noise, high-stability 12-V source with minimal external components to reduce board space and cost. Use Value: Fixed output eliminates resistor-divider errors affecting measurement accuracy; 52-kHz switching frequency avoids interference with sensitive analog bandwidths below 100 kHz. |
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-12 | Standard-voltage version (max VIN = 40 V); identical pinout, package, and 12-V output spec; RθJA = 42.6°C/W (TO-263) or 32.4°C/W (TO-220). | Suitable only for ≤40 V input systems; lacks HV transient margin for 48-V industrial or automotive applications. | Select LM2576T-12 only when input never exceeds 40 V and thermal budget permits higher junction rise. |
| LM2596T-12 | Higher 150-kHz switching frequency; lower 3-A max output; requires different inductor value (typically 33–47 µH); same TO-220-5 package and pinout. | Better suited for compact designs needing smaller magnetics, but reduced efficiency at high VIN/VOUT ratios and higher EMI susceptibility above 100 kHz. | Choose LM2596T-12 when board space is constrained and input voltage is ≤40 V; avoid in high-noise-sensitive analog systems. |
Compared with LM2576T-12, LM2576HVT-12/LF03 adds 20-V input headroom critical for 48-V bus reliability, while LM2596T-12 trades thermal robustness for higher frequency and smaller passive size - making LM2576HVT-12/LF03 optimal for ruggedized industrial 12-V conversion where efficiency and transient immunity outweigh size constraints.
Availability
LM2576HVT-12/LF03 is available at Aetrix Electronics and suitable for industrial motor drives, merchant network PSUs, and appliance control boards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2576HVT-12/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 technologies, with decades of expertise in highly reliable power conversion ICs.
The LM2576xx series was designed specifically for cost-sensitive, high-reliability industrial and commercial DC-DC conversion applications where simplicity, thermal resilience, and long-term supply stability are prioritized over ultra-high frequency or synchronous efficiency.
FAQ
What is the maximum input voltage rating for LM2576HVT-12/LF03?
The LM2576HVT-12/LF03 has an absolute maximum input voltage of 63 V and a recommended operating maximum of 60 V. This HV rating distinguishes it from the standard LM2576 (40 V max) and enables use in 48-V systems with transient margin. Exceeding 60 V in normal operation risks premature device failure due to internal transistor stress.
Does LM2576HVT-12/LF03 require an external feedback resistor divider?
No - LM2576HVT-12/LF03 is a fixed 12-V output variant, so the FEEDBACK pin (Pin 4) is internally connected to the output. External resistors are unnecessary, eliminating associated tolerance errors and temperature drift. This simplifies layout and improves long-term output stability compared to adjustable versions.
What thermal management is required for continuous 3-A operation of LM2576HVT-12/LF03?
For continuous 3-A output at full load and 60-V input, LM2576HVT-12/LF03 requires either a properly sized heatsink attached to the exposed tab or ≥1 in² of 2-oz copper on the PCB connected directly to the tab. On a JEDEC 4-layer board, its RθJA is 32.4°C/W; without thermal relief, junction temperature will exceed 150°C, triggering thermal shutdown.
Can LM2576HVT-12/LF03 be used in synchronous rectifier configurations?
No - LM2576HVT-12/LF03 is a non-synchronous buck regulator with an internal NPN switch and requires an external catch diode (e.g., 1N5822). It does not support synchronous rectification; replacing the diode with a MOSFET without gate drive control will cause shoot-through and device failure. For synchronous operation, consider LM76003 or LMR51430.
What is the purpose of the ON/OFF pin on LM2576HVT-12/LF03, and how is it used?
Pin 5 (ON/OFF) enables TTL-compatible shutdown: pulling it ≥2.2 V disables regulation and reduces quiescent current to 50 μA typical; pulling it ≤1.2 V enables normal operation. It must never be left floating - tie to GND via ≤10-kΩ resistor for always-on use. This pin supports microcontroller-based power sequencing and low-power sleep modes without external logic.
LM2576HVT-12/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):
- 12V
- 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-12/LF03 FAQ
1.How can I place an order for LM2576HVT-12/LF03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVT-12/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-12/LF03 reliable?
The price and inventory of LM2576HVT-12/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-12/LF03 is usually 5 days.
3.What payment methods are accepted for LM2576HVT-12/LF03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVT-12/LF03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVT-12/LF03?
LM2576HVT-12/LF03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVT-12/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-12/LF03?
For technical support, including LM2576HVT-12/LF03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVT-12/LF03 requirements.
6.How does Aetrix verify that LM2576HVT-12/LF03 is sourced from the original manufacturer or authorized distributors?
All LM2576HVT-12/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-12/LF03 meets industry standards.
7.What is the process for return or replacement of LM2576HVT-12/LF03?
All LM2576HVT-12/LF03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVT-12/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-12/LF03 part is unused and in its original packaging.
Return procedure for LM2576HVT-12/LF03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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