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Texas Instruments LM2576HVT-15/NOPB
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- Part No.:
- LM2576HVT-15/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2576HVT-15/NOPB.pdf
- Description:
- IC REG BUCK 15V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:309
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Product details
Overview
LM2576HVT-15/NOPB from Texas Instruments is a non-synchronous 3-A step-down DC-DC switching regulator with fixed 15-V output, 40–60-V input range, 52-kHz fixed-frequency oscillator, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in high-input-voltage industrial power supplies requiring compact, efficient 15-V rail generation.
For engineers reviewing the LM2576HVT-15/NOPB datasheet, LM2576HVT-15/NOPB pinout, LM2576HVT-15/NOPB application, or LM2576HVT-15/NOPB equivalent, key selection criteria 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-15/NOPB implements a monolithic buck converter architecture with an internal NPN power switch, fixed 52-kHz oscillator, and voltage-mode error amplifier referenced to a 1.23-V bandgap. Its HV variant supports up to 60-V input, enabling direct regulation from unregulated 48-V telecom or industrial bus rails without pre-regulation.
It operates in continuous conduction mode under full load and transitions to discontinuous mode at light loads. Protection features include cycle-by-cycle current limiting (ICL = 4.2–6.9 A), thermal shutdown, and undervoltage lockout via external circuitry - no internal UVLO threshold is defined for the HV version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over line, load, and temperature - ensures stable logic or analog supply without external feedback resistors. |
| Input Voltage Range | 40 V to 60 V - supports direct connection to 48-V nominal industrial/telecom systems with margin for transients. |
| Output Current | 3 A DC continuous - delivers sufficient power for motor drivers, PLC I/O modules, or instrumentation front-ends. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Efficiency | 88% at VIN = 18 V, IOUT = 3 A - minimizes thermal load versus linear regulators, reducing or eliminating heatsink requirements. |
| Standby Current | 50 μA typical at ON/OFF = HIGH - enables low-power system sleep modes without auxiliary LDOs. |
| Thermal Resistance | RθJA = 32.4°C/W (KC package) - defines maximum power dissipation (≈3.1 W) before junction exceeds 125°C at 25°C ambient. |
Pinout & Package
LM2576HVT-15/NOPB uses the KC (TO-220, 5-pin) 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 | High-side switch collector input | Accepts 40–60-V DC input; requires short, low-inductance path to input capacitor to minimize switching noise and voltage spikes. |
| 2 - OUTPUT | Switch emitter node | Drives external inductor and catch diode; high dv/dt node requiring careful PCB layout and ground plane isolation. |
| 3 - GROUND | Power and signal reference | Common return for input/output capacitors, feedback network, and ON/OFF control; must be low-impedance with minimal trace length to VIN and OUTPUT pins. |
| 4 - FEEDBACK | Regulation sense input | Internally tied to 15-V output; unused in fixed versions but must be left unconnected or grounded per datasheet guidance for stability. |
| 5 - ON/OFF | TTL-compatible enable control | Logic HIGH (>1.4 V) disables switching and reduces quiescent current to 50 μA; must not float - tie to GND for always-on operation. |
| TAB | Thermal and electrical ground | Electrically connected to pin 3; requires mechanical mounting to heatsink or ≥1 in² copper area on PCB for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Protects device during overload or poor heatsinking by halting switching when junction temperature exceeds ~150°C. |
| Cycle-by-cycle current limiting | Prevents switch destruction during short-circuit or startup by clamping peak inductor current to 4.2–6.9 A. |
| Fixed-frequency PWM control | Enables predictable EMI spectrum and simplifies filter design versus variable-frequency alternatives. |
| Low-component-count design | Requires only one inductor, one diode, two capacitors, and optional ON/OFF pull-down - reduces BOM cost and layout risk. |
| TTL-compatible enable | Allows direct interfacing with microcontrollers or logic circuits without level-shifting components. |
Applications
| Industrial Motor Drives | Telecom Power Conversion |
|---|---|
Use Scenario: Providing regulated 15-V gate drive and logic supply for half-bridge IGBT/MOSFET drivers in 48-V DC-fed brushless motor controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 15-V rail with fast transient response to handle driver IC current surges. Use Value: Eliminates need for separate 48-V-to-15-V isolated DC-DC module, reducing size and cost while maintaining ±4% output accuracy across motor load variations. | Use Scenario: Generating 15-V bias supply for optical transceivers and line-card supervisory circuits in 48-V telecom shelf systems. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator handling wide-line transients (up to 60 V) without derating or external clamping. Use Value: Leverages 60-V absolute maximum input rating to survive telecom surge standards (GR-1089), avoiding additional TVS protection components. |
| Test Equipment Power Rails | Appliance Control Boards |
Use Scenario: Supplying precision 15-V analog rails for ADC references, op-amp biasing, and sensor excitation in portable benchtop DMMs and signal generators. IC Role / Device Role / Timing Role: Low-noise, tightly regulated DC source with <150-mV peak-to-peak ripple (with recommended LC filter) for analog subsystems. Use Value: Achieves ±4% output tolerance and 88% efficiency without complex compensation, simplifying validation against EN 61000-4-2/3 immunity requirements. | Use Scenario: Powering MCU, display backlight, and relay drivers in smart home appliances operating from rectified AC or 48-V battery packs. IC Role / Device Role / Timing Role: Robust main DC-DC converter supporting wide ambient temperature (−40°C to +125°C) and long-life electrolytic capacitor compatibility. Use Value: Enables single-supply architecture using standard 100-μF input capacitors and off-the-shelf 150-μH inductors, accelerating time-to-market for Class B EMC-compliant designs. |
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-15/NOPB | Standard-voltage version (40-V max input); identical pinout, package, and 15-V output spec. | Suitable only for ≤40-V input systems; lacks HV transient margin for telecom/industrial 48-V buses. | Select when input never exceeds 40 V and cost sensitivity outweighs surge robustness. |
| LM76003QRNLRQ1 | Synchronous 3.5-A buck with 3.5–60-V input, 2.2-MHz switching, and integrated high-/low-side FETs. | Higher efficiency (>92%), smaller solution size, but requires more complex layout and external compensation. | Choose for new designs needing higher density, lower EMI, and improved light-load efficiency - not drop-in compatible. |
Compared with LM2576HVT-15/NOPB, LM2576T-15/NOPB offers identical functionality at lower cost but reduced input voltage margin, while LM76003QRNLRQ1 delivers superior efficiency and integration at the expense of design complexity and non-pin-compatibility.
Availability
LM2576HVT-15/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, telecom power conversion, test equipment power rails, and appliance control boards requiring stable component supply with long lifecycle visibility.
Supply support for LM2576HVT-15/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 company specializing in analog, embedded processing, and power management technologies, with leadership in industrial, automotive, and communications markets.
The LM2576 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for engineers seeking easy-to-use, robust, and cost-effective DC-DC solutions for non-isolated step-down applications in harsh environments.
FAQ
What is the maximum input voltage rating for LM2576HVT-15/NOPB?
The LM2576HVT-15/NOPB has a maximum input voltage rating of 60 V, confirmed in the Absolute Maximum Ratings table (Section 6.1) and Recommended Operating Conditions (Section 6.3). This HV rating distinguishes it from the standard LM2576T-15/NOPB (40 V max) and enables direct regulation from 48-V industrial or telecom bus systems with headroom for transients.
Does LM2576HVT-15/NOPB require external feedback resistors to set the output voltage?
No. The LM2576HVT-15/NOPB is a fixed-output version with internal resistor divider network configured for 15 V. Pin 4 (FEEDBACK) is internally connected to the output and must remain unconnected or grounded per datasheet guidance - no external resistors are needed or permitted for output voltage setting.
What thermal performance can be expected from LM2576HVT-15/NOPB in the KC package?
In the KC (TO-220) package, LM2576HVT-15/NOPB has RθJA = 32.4°C/W (Section 6.4). At 3-A load and 18-V input, power dissipation is ≈3.1 W; with 25°C ambient, junction temperature reaches ≈128°C - near the 125°C limit. Use of a heatsink or ≥1 in² copper pour is mandatory for full-load operation at elevated ambient temperatures.
How does the ON/OFF pin function on LM2576HVT-15/NOPB?
The ON/OFF pin (Pin 5) provides TTL-compatible enable control: logic HIGH (>1.4 V) places LM2576HVT-15/NOPB in shutdown mode with 50-μA standby current, while logic LOW (<1.2 V) enables normal operation. The pin must not be left floating - tie directly to GND for always-on use, or interface with MCU GPIO for controlled power sequencing.
Is LM2576HVT-15/NOPB RoHS compliant and lead-free?
Yes. The "/NOPB" suffix in LM2576HVT-15/NOPB explicitly denotes lead-free (Pb-free) and RoHS-compliant packaging per Texas Instruments' product nomenclature. This is verified in TI's official orderable addendum and packaging documentation for the KC package variant.
LM2576HVT-15/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5
- 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):
- 15V
- 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-15/NOPB FAQ
1.How can I place an order for LM2576HVT-15/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVT-15/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-15/NOPB reliable?
The price and inventory of LM2576HVT-15/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-15/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVT-15/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVT-15/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVT-15/NOPB?
LM2576HVT-15/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVT-15/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-15/NOPB?
For technical support, including LM2576HVT-15/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVT-15/NOPB requirements.
6.How does Aetrix verify that LM2576HVT-15/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVT-15/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-15/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVT-15/NOPB?
All LM2576HVT-15/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVT-15/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-15/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVT-15/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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