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Texas Instruments LM2576HVT-3.3/NOPB
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- Part No.:
- LM2576HVT-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2576HVT-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,047
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Product details
Overview
LM2576HVT-3.3/NOPB from Texas Instruments is a non-synchronous step-down DC-DC converter IC delivering 3-A output at fixed 3.3 V, with 40–60 V input range, 52-kHz fixed-frequency operation, and integrated thermal shutdown and cycle-by-cycle current limiting-used in industrial power supplies and motor drive auxiliary rails.
For engineers reviewing the LM2576HVT-3.3/NOPB datasheet, LM2576HVT-3.3/NOPB pinout, LM2576HVT-3.3/NOPB application, or LM2576HVT-3.3/NOPB equivalent, key selection considerations include HV input capability (60 V max), TO-220/KC package thermal performance (RθJA = 32.4°C/W), ±4% output voltage tolerance over line/load/temperature, and TTL-compatible ON/OFF control with 50-μA standby current.
Technical Context
The LM2576HVT-3.3/NOPB implements a buck topology using an internal NPN power transistor switch, fixed 52-kHz oscillator, and voltage-mode error amplifier with 1.23-V internal reference. It operates in continuous conduction mode under full load and transitions to discontinuous mode at light loads without regulation loss.
Its functional block includes undervoltage lockout (UVLO) activation above ~4.5 V input, cycle-by-cycle peak current limiting (ICL = 4.2–6.9 A), and thermal shutdown triggered at TJ ≥ 150°C. The ON/OFF pin enables active low logic control with 1.2-V threshold for turn-on and 1.4-V threshold for shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over −40°C to +125°C, 6–60 V input, 0.5–3 A load-ensures stable logic rail generation without external feedback resistors. |
| Input Voltage Range | 40 V (min) to 60 V (max)-supports wide-input industrial and automotive battery-fed systems where transient spikes exceed 40 V. |
| Output Current | 3 A DC continuous-sufficient to power microcontrollers, FPGAs, and peripheral ICs without external current boosting. |
| Switching Frequency | 52 kHz ±10% (42–63 kHz)-enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 75% typical at 12 VIN, 3 A, 3.3 VOUT-reduces heat sink requirements compared to linear regulators; no heatsink needed below ~1.5 W dissipation. |
| Standby Current | 50 μA typical at ON/OFF = 5 V-enables low-power system sleep modes while retaining fast wake-up capability. |
| Thermal Resistance | RθJA = 32.4°C/W (KC/TO-220 package)-defines maximum power dissipation (≈3.1 W at ΔT = 100°C) before thermal shutdown activates. |
Pinout & Package
KC package: 5-pin TO-220 with integral heat tab connected to GROUND; body size 10.16 mm × 8.51 mm; tab serves as thermal and electrical ground path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | High-side switch collector input | Accepts 40–60 V unregulated DC; requires short-path, low-ESR input capacitor (≥100 μF) to minimize switching noise injection. |
| 2 - OUTPUT | Switch emitter node | Drives external inductor and catch diode; high dv/dt node requiring tight layout to reduce EMI and prevent false triggering. |
| 3 - GROUND | Power and signal reference | Low-impedance return path for VIN bypass, feedback, and ON/OFF circuits; must be tied directly to tab and PCB ground plane. |
| 4 - FEEDBACK | Regulation sense input | Internally connected to 3.3 V output; left unconnected in fixed versions-no external resistor divider required. |
| 5 - ON/OFF | Enable/disable control | TTL-compatible input: <1.2 V = active, >1.4 V = shutdown; 50-μA standby draw allows direct MCU GPIO control without level shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Activates at TJ = 150°C and auto-recovers after cooldown-eliminates need for external thermal monitoring in sealed enclosures. |
| Cycle-by-cycle current limiting | Peak ISW limit of 4.2–6.9 A prevents inductor saturation and MOSFET failure during output shorts or startup surges. |
| Fixed 3.3-V output | No external feedback components required-reduces BOM count, layout area, and calibration risk for standard logic supply rails. |
| Wide input range (60 V max) | Supports 48-V industrial buses, automotive cold-crank transients, and PoE-powered equipment without pre-regulation. |
| 52-kHz oscillator | Enables use of low-cost, high-current toroidal inductors (e.g., 33–100 μH) with minimal core loss and audible noise. |
Applications
| Industrial Motor Drive Auxiliary Power | 48-V Telecom Server PSU |
|---|---|
|
Use Scenario: Powers gate drivers, isolation amplifiers, and MCU cores in servo inverters where main bus runs at 48–60 V DC. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator converting unregulated 48-V bus to isolated logic supply; operates continuously at 3-A load. Use Value: Eliminates need for discrete linear regulator + heatsink; RθJA = 32.4°C/W enables convection-cooled design in compact drive modules. |
Use Scenario: Generates 3.3-V standby rail in multi-output telecom server PSUs handling 48-V backplane input with transient spikes up to 60 V. IC Role / Device Role / Timing Role: Secondary regulated output stage activated only during system boot or maintenance mode via ON/OFF pin control. Use Value: 50-μA standby current minimizes quiescent loss; fixed 3.3-V output ensures compatibility with PCIe and DDR memory interface specs. |
| Test Equipment Power Module | Appliance Mainboard Logic Supply |
|
Use Scenario: Supplies clean 3.3-V power to ADCs, DACs, and FPGA configuration circuits in portable bench instruments operating from universal AC adapters. IC Role / Device Role / Timing Role: Non-isolated buck converter with low output ripple (<50 mVpp with recommended LC filter) for analog signal chain integrity. Use Value: Fixed 3.3-V output avoids trimming errors; 52-kHz frequency simplifies EMI compliance testing per CISPR 11 Class B limits. |
Use Scenario: Provides 3.3-V MCU and sensor interface power in washing machines and HVAC controllers exposed to 24–48 V battery or rectified AC inputs. IC Role / Device Role / Timing Role: Robust primary DC-DC stage with UVLO and thermal protection-survives brownouts and ambient temperatures up to 85°C. Use Value: ±4% output tolerance meets IEC 61000-4-11 immunity requirements; TO-220 package allows direct mounting to metal chassis for passive cooling. |
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-3.3/NOPB | Max input voltage 40 V (vs. 60 V); identical pinout, package, and 3.3-V output spec. | Suitable only for ≤40 V input systems; cannot withstand 48-V bus transients or automotive load dump. | Select when input never exceeds 40 V and cost sensitivity outweighs HV margin. |
| LM76003QRNLRQ1 | Synchronous 3.5-A buck with 3.5–60 V input, 2.2-MHz switching, and integrated high-/low-side MOSFETs. | Requires no external diode; higher efficiency (>90%) but needs more complex layout and external compensation. | Choose for space-constrained designs needing >85% efficiency and smaller magnetics-requires redesign of inductor and loop compensation. |
Compared with LM2576HVT-3.3/NOPB, LM2576T-3.3/NOPB trades HV robustness for lower cost in benign-input environments, while LM76003QRNLRQ1 delivers higher efficiency and integration at the expense of design simplicity and external component count.
Availability
LM2576HVT-3.3/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, telecom server PSUs, test equipment, appliance mainboards, and 48-V battery-powered systems requiring stable component supply across long production lifecycles.
Supply support for LM2576HVT-3.3/NOPB 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 high-reliability power conversion ICs.
The LM2576 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators in industrial, automotive, and consumer power applications-emphasizing simplicity, fault protection, and wide-input capability.
FAQ
What is the absolute maximum input voltage rating for LM2576HVT-3.3/NOPB?
The absolute maximum input voltage for LM2576HVT-3.3/NOPB is 63 V, as specified in Section 6.1 of the TI datasheet SNVS107G. Operation above 60 V violates recommended conditions and risks permanent damage. The device is rated for continuous operation up to 60 V, making it suitable for 48-V systems with transient headroom.
Does LM2576HVT-3.3/NOPB require external feedback resistors to set the output voltage?
No, LM2576HVT-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its 3.3-V regulation is implemented internally-the FEEDBACK pin (Pin 4) is internally connected to the output and must be left unconnected in PCB layout. This eliminates resistor tolerance errors and simplifies design validation.
Can LM2576HVT-3.3/NOPB be used in synchronous rectification configurations?
No, LM2576HVT-3.3/NOPB is a non-synchronous buck converter and does not support synchronous rectification. It uses an internal NPN switch and requires an external Schottky catch diode (e.g., 1N5822). Synchronous operation would require replacing the diode with a second MOSFET and adding gate drive timing-functionality not supported by this IC's architecture.
What thermal derating applies to LM2576HVT-3.3/NOPB in a TO-220 package without a heatsink?
In free-air convection (no heatsink), LM2576HVT-3.3/NOPB's KC package has RθJA = 32.4°C/W. At 25°C ambient, maximum continuous power dissipation before thermal shutdown is ≈3.1 W. For 3-A output at 3.3 V with 12 V input, dissipation is ~26 W-so a heatsink or forced airflow is mandatory; standalone operation is only viable below ~1.2 A load.
How does the ON/OFF pin function on LM2576HVT-3.3/NOPB, and what logic levels enable operation?
The ON/OFF pin (Pin 5) is an active-low enable input. LM2576HVT-3.3/NOPB operates when the pin voltage is <1.2 V (typical), and enters 50-μA standby mode when >1.4 V (typical). It accepts direct connection to MCU GPIOs-no level shifter needed-and must never be left floating to prevent erratic behavior.
LM2576HVT-3.3/NOPB 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):
- 3.3V
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2576HVT-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVT-3.3/NOPB 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-3.3/NOPB reliable?
The price and inventory of LM2576HVT-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576HVT-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVT-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVT-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVT-3.3/NOPB?
LM2576HVT-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVT-3.3/NOPB 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-3.3/NOPB?
For technical support, including LM2576HVT-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVT-3.3/NOPB requirements.
6.How does Aetrix verify that LM2576HVT-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVT-3.3/NOPB 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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVT-3.3/NOPB?
All LM2576HVT-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVT-3.3/NOPB, 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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVT-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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