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Texas Instruments LM2576HVT-ADJ/LF03
- Part No.:
- LM2576HVT-ADJ/LF03
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576HVT-ADJ/LF03.pdf
- Description:
- IC REG BUCK ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:256
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Product details
Overview
LM2576HVT-ADJ/LF03 from Texas Instruments is a non-synchronous 3-A step-down DC-DC switching regulator in TO-220-5 (KC) package, supporting adjustable output voltage from 1.23 V to 37 V (±4% tolerance), 40–60 V input range, and fixed 52-kHz oscillator frequency. It delivers high efficiency in motor drives and industrial power supplies with integrated thermal shutdown and cycle-by-cycle current limiting.
For engineers reviewing the LM2576HVT-ADJ/LF03 datasheet, LM2576HVT-ADJ/LF03 pinout, LM2576HVT-ADJ/LF03 application, or LM2576HVT-ADJ/LF03 equivalent, this page provides verified pin functions, real-world thermal performance data, confirmed HV-version input voltage limits, and validated alternative parts for buck converter redesigns requiring >40 V input capability.
Technical Context
The LM2576HVT-ADJ/LF03 implements a fixed-frequency, pulse-width modulation (PWM) buck topology with internal 3-A NPN switch, 1.23-V bandgap reference, and error amplifier. Its ON/OFF pin enables TTL-compatible shutdown with 50-μA standby current, while cycle-by-cycle current limiting and thermal shutdown provide fault protection without external circuitry.
This HV variant operates across −40°C to +125°C junction temperature, supports up to 60-V maximum input voltage, and maintains ±4% output regulation over line and load conditions. The 52-kHz oscillator exhibits ±10% variation across temperature and supply, enabling predictable EMI filtering and inductor selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A continuous - supports industrial loads without external current boosting |
| Input Voltage Range | 4.5 V to 60 V - enables direct connection to 48-V telecom or automotive battery systems |
| Output Voltage Range | 1.23 V to 37 V (adjustable) - set via external resistor divider; 1.23-V reference enables low-voltage rails |
| Oscillator Frequency | 52 kHz (±10%) - fixed frequency simplifies EMI filter design and avoids audible noise |
| Feedback Reference Voltage | 1.23 V (±2.2%) - defines output accuracy; used with R1/R2 to set VOUT = 1.23 × (1 + R2/R1) |
| Current Limit Threshold | 4.2 A to 6.9 A (typ. 5.8 A) - protects switch during overload; enables robust start-up into capacitive loads |
| Standby Quiescent Current | 50 μA (typ.) - allows ultra-low-power shutdown in battery-backed systems |
Pinout & Package
LM2576HVT-ADJ/LF03 uses the KC (TO-220-5) package with 10.16 mm × 8.51 mm body size and integral heat slug connected to GND. Thermal resistance is RθJA = 32.4°C/W on standard PCB, reduced further with heatsink attachment to the tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Connects to high-side transistor collector; requires short, low-inductance path to input capacitor |
| 2 - OUTPUT | Switching node | Drives external inductor and catch diode cathode; high dv/dt node requiring careful layout |
| 3 - GROUND | Power and signal return | Common reference for all circuits; must be tied directly to CIN ground with minimal trace length |
| 4 - FEEDBACK | Voltage sense input | Monitors output via resistor divider; open for fixed versions; sets regulation point for ADJ version |
| 5 - ON/OFF | Enable control | TTL-compatible logic input: <1.2 V = active, >1.4 V = shutdown; 50-μA standby draw |
| TAB | Thermal pad / GND | Internally connected to GND; soldered to heatsink or large copper pour for thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-A NPN switch | Eliminates need for external MOSFET driver and discrete switch; reduces BOM count by ≥4 components |
| Fixed 52-kHz oscillator | Enables consistent inductor sizing and predictable EMI spectrum; avoids variable-frequency jitter issues |
| Cycle-by-cycle current limiting | Prevents switch destruction during short-circuit or heavy transient loads without external sensing |
| Thermal shutdown protection | Automatically disables regulator at TJ ≥ 150°C; recovers after cooldown - no latch required |
| Low 50-μA shutdown current | Supports energy-sensitive applications such as remote sensors or backup power systems |
Applications
| Industrial Motor Drives | Merchant Server PSU |
|---|---|
Use Scenario: Powering gate drivers and logic supplies in 24–48-V brushless DC motor controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 5-V or 12-V rail from unregulated bus. Use Value: 60-V max input withstands motor back-EMF spikes; 3-A output supports multiple gate drivers simultaneously. | Use Scenario: Generating auxiliary 3.3-V/5-V rails in multi-output server power supplies. IC Role / Device Role / Timing Role: Secondary buck stage converting intermediate 12-V bus to low-voltage logic rails. Use Value: Fixed-frequency operation simplifies EMI compliance testing; ±4% output tolerance meets ATX spec requirements. |
| Test Equipment Power | Appliance Control Boards |
Use Scenario: Providing clean, adjustable bias voltage for analog front-ends in bench DMMs and oscilloscopes. IC Role / Device Role / Timing Role: Adjustable-output buck converter supplying precision analog subsystems. Use Value: 1.23-V reference and resistor-divider flexibility enable exact voltage setting (e.g., 2.500 V ±0.1%); low ripple supports 16-bit ADC accuracy. | Use Scenario: Regulating MCU, display, and sensor rails in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Main system power IC converting 24-V or 48-V battery/bus to 3.3-V/5-V logic supply. Use Value: −40°C to +125°C operating range ensures reliability in hot enclosures; TO-220 package allows direct heatsink mounting. |
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-ADJ | 40-V max input (vs. 60 V); identical pinout, package, and feedback architecture | Suitable only for ≤40-V input systems; not rated for 48-V telecom or industrial bus transients | Select when input never exceeds 40 V and cost sensitivity outweighs HV margin |
| LM76003QRNXTQ1 | Synchronous 3.5-A converter; 3.5–60-V input; 300-kHz–2.2-MHz programmable frequency; QFN-16 package | Requires more external components but offers higher efficiency (>90%), smaller solution size, and automotive AEC-Q100 qualification | Choose for new designs needing higher efficiency, smaller footprint, or automotive qualification |
Compared with LM2576T-ADJ, LM2576HVT-ADJ/LF03 adds 20-V input headroom critical for surge-prone environments; versus LM76003QRNXTQ1, it trades efficiency and integration for simplicity, lower component count, and proven field reliability in legacy industrial systems.
Availability
LM2576HVT-ADJ/LF03 is available at Aetrix Electronics and suitable for industrial motor drives, merchant server PSUs, test equipment power, and appliance control boards requiring stable component supply and long-term manufacturability.
Supply support for LM2576HVT-ADJ/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs with broad industrial and automotive reach.
The LM2576 series was designed as a drop-in, high-current replacement for linear regulators in medium-power DC-DC conversion, emphasizing ease of use, thermal robustness, and minimal external component count for cost-sensitive industrial applications.
FAQ
What is the maximum input voltage rating for LM2576HVT-ADJ/LF03?
The LM2576HVT-ADJ/LF03 has an absolute maximum input voltage of 63 V and a recommended operating maximum of 60 V. This HV rating distinguishes it from standard LM2576 variants (max 40 V) and enables use in 48-V systems with transient margin. Operation beyond 60 V risks permanent damage per Absolute Maximum Ratings table in the TI datasheet SNVS107G.
Does LM2576HVT-ADJ/LF03 require an external diode, and what type is recommended?
Yes, LM2576HVT-ADJ/LF03 requires an external Schottky catch diode connected between the OUTPUT pin and GND. TI recommends the 1N5822 (3-A, 40-V) or equivalent with low forward voltage and fast recovery. The diode conducts during switch-off time and must handle peak currents up to 3 A; omitting it causes catastrophic failure due to inductive kickback.
How is output voltage set on LM2576HVT-ADJ/LF03?
LM2576HVT-ADJ/LF03 uses a resistor divider from VOUT to GND, with the midpoint connected to the FEEDBACK pin. Output voltage is calculated as VOUT = 1.23 V × (1 + R2/R1), where R1 connects FEEDBACK to GND and R2 connects VOUT to FEEDBACK. The 1.23-V internal reference is trimmed to ±2.2%, ensuring accurate regulation across temperature and load.
Can LM2576HVT-ADJ/LF03 be synchronized to an external clock?
No, LM2576HVT-ADJ/LF03 does not support external clock synchronization. It uses an internal fixed-frequency 52-kHz oscillator with ±10% tolerance. For synchronizable alternatives, consider the LM76003 or LMR51430, which offer programmable switching frequencies and sync inputs - but require different pinouts and layout.
What thermal performance can be expected from LM2576HVT-ADJ/LF03 in TO-220 package?
In the KC (TO-220-5) package, LM2576HVT-ADJ/LF03 has RθJA = 32.4°C/W on a standard 4-layer JEDEC board. With a properly mounted heatsink, junction temperature rise is ~97°C at full 3-A load and 60-V input (worst-case power dissipation). Derating is required above 125°C ambient; thermal shutdown activates at 150°C to prevent damage.
LM2576HVT-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 57V
- 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-ADJ/LF03 FAQ
1.How can I place an order for LM2576HVT-ADJ/LF03 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVT-ADJ/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-ADJ/LF03 reliable?
The price and inventory of LM2576HVT-ADJ/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-ADJ/LF03 is usually 5 days.
3.What payment methods are accepted for LM2576HVT-ADJ/LF03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVT-ADJ/LF03 transactions.
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4.How is shipping managed for LM2576HVT-ADJ/LF03?
LM2576HVT-ADJ/LF03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVT-ADJ/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-ADJ/LF03?
For technical support, including LM2576HVT-ADJ/LF03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVT-ADJ/LF03 requirements.
6.How does Aetrix verify that LM2576HVT-ADJ/LF03 is sourced from the original manufacturer or authorized distributors?
All LM2576HVT-ADJ/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-ADJ/LF03 meets industry standards.
7.What is the process for return or replacement of LM2576HVT-ADJ/LF03?
All LM2576HVT-ADJ/LF03 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVT-ADJ/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-ADJ/LF03 part is unused and in its original packaging.
Return procedure for LM2576HVT-ADJ/LF03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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