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Texas Instruments LM2576HVT-ADJ/NOPB
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- Part No.:
- LM2576HVT-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2576HVT-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,040
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Product details
Overview
LM2576HVT-ADJ/NOPB from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-220-5 (KC) package, supporting adjustable output from 1.23 V to 37 V (±4% tolerance), 40–60 V input range, and fixed 52-kHz switching frequency. It delivers high-efficiency power conversion for industrial and embedded systems requiring robust thermal performance and minimal external components.
For engineers reviewing the LM2576HVT-ADJ/NOPB datasheet, LM2576HVT-ADJ/NOPB pinout, LM2576HVT-ADJ/NOPB application, or LM2576HVT-ADJ/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed thermal metrics for KC package, real-world efficiency data at 3 A load, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The LM2576HVT-ADJ/NOPB integrates a 3-A NPN switch, fixed-frequency 52-kHz oscillator, internal bandgap reference (1.23 V), error amplifier, current-limit comparator, and thermal shutdown circuitry. Its architecture uses cycle-by-cycle peak current limiting and automatic frequency foldback (to ~11 kHz) under short-circuit conditions to prevent inductor saturation and device damage.
It operates in continuous conduction mode under full load and transitions to discontinuous mode at light loads - a behavior confirmed across test conditions in Figures 6-4, 6-9, and 6-19. The ON/OFF pin enables TTL-compatible shutdown with 50-μA standby current, while feedback voltage accuracy (±4%) is maintained over −40°C to +125°C junction temperature and full line/load ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A DC maximum - supports sustained industrial loads without external current boosting. |
| Input Voltage Range | 40 V to 60 V - enables direct use with 48-V telecom or industrial bus rails without pre-regulation. |
| Output Voltage Range | 1.23 V to 37 V (adjustable) - set via external resistor divider; ±4% regulation over line/load/temperature. |
| Switching Frequency | 52 kHz (±10%) - fixed internal oscillator simplifies EMI filtering and eliminates external timing components. |
| Efficiency | 77% at VIN = 12 V, VOUT = 5 V, IOUT = 3 A - measured per Figure 6-9; reduces thermal load vs. linear regulators. |
| Standby Current | 50 μA typical - enables low-power system sleep modes via ON/OFF pin control. |
| Thermal Resistance | RθJA = 32.4°C/W (KC package, JEDEC 4-layer board) - defines heatsink sizing requirements for 125°C max TJ. |
Pinout & Package
LM2576HVT-ADJ/NOPB uses the KC (TO-220-5) package with integrated heat tab connected to GND. Thermal performance relies on mechanical mounting to heatsink or PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Connects to high-side transistor collector; requires low-inductance path to CIN for stable switching. |
| 2 - OUTPUT | Switching node | Emitter of internal NPN switch; drives external inductor and catch diode cathode. |
| 3 - GROUND | Reference return | Common return for internal circuits and external CIN; shortest possible trace to minimize noise coupling. |
| 4 - FEEDBACK | Voltage sense input | Monitors output via resistor divider; 1.23 V reference sets VOUT = 1.23 × (1 + R2/R1). |
| 5 - ON/OFF | Enable control | TTL-compatible shutdown: >1.4 V = OFF (50 μA standby); <1.2 V = ON (active regulation). |
| TAB | Thermal ground | Internally tied to GND; must be soldered to heatsink or large copper pour for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 52-kHz oscillator | Eliminates external timing components and ensures predictable EMI profile for EMC-compliant designs. |
| Cycle-by-cycle current limit | Protects internal switch and external inductor during overload or short-circuit events without latch-up. |
| Thermal shutdown | Automatically disables switching above 150°C junction temperature; resumes operation after cooldown. |
| Low quiescent current | 5 mA typical operating IQ and 50 μA standby enable battery-backed or energy-sensitive applications. |
| Wide input range (60 V max) | Supports unregulated 48-V systems and transient-tolerant industrial supplies without external clamping. |
Applications
| Industrial Motor Drives | Merchant Network PSU |
|---|---|
|
Use Scenario: Powering gate drivers and logic circuits in 24–48-V motor control modules. IC Role / Device Role / Timing Role: Primary 3-A buck regulator generating isolated 5-V or 12-V rails from main bus. Use Value: High input voltage tolerance (60 V) accommodates bus transients; thermal shutdown prevents failure during stall conditions. |
Use Scenario: Secondary-side regulation in multi-rail server power supplies for management controllers. IC Role / Device Role / Timing Role: Adjustable-output converter delivering precise 3.3-V or 5-V to BMC and fan controllers. Use Value: ±4% output accuracy ensures reliable digital logic operation; 52-kHz switching allows compact LC filter design. |
| Test Equipment Power | Home Appliance Control |
|
Use Scenario: Lab-grade bench power supplies requiring stable, low-noise auxiliary rails. IC Role / Device Role / Timing Role: Adjustable 1.23–37-V output stage enabling user-configurable voltage outputs. Use Value: Verified 3-A capability supports simultaneous powering of analog front-ends and microcontrollers; low ripple (<50 mVpp) confirmed in Figure 6-18. |
Use Scenario: Mainboard power for washing machine or HVAC control boards operating from rectified AC. IC Role / Device Role / Timing Role: Step-down regulator converting 30–55-V DC bus to 5-V MCU supply and 12-V relay driver rail. Use Value: TO-220 package enables direct heatsink mounting in space-constrained enclosures; ON/OFF pin supports sleep/wake sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM76003QPWPRQ1 | 3.5-A synchronous buck, 3.5–60 V input, 300 kHz–2.2 MHz programmable frequency, integrated high-/low-side FETs. | Higher efficiency (>90%), smaller solution size, but requires more complex layout and external compensation. | Preferred for new designs needing higher efficiency and smaller footprint; not pin-compatible with LM2576HVT-ADJ/NOPB. |
| LMR51430RGER | 3-A synchronous buck, 4.5–36 V input, 500 kHz/1.1 MHz selectable frequency, integrated FETs, 40-μA quiescent current. | Lower input voltage ceiling (36 V), no HV option, but superior light-load efficiency and faster transient response. | Suitable where input stays below 36 V and ultra-low IQ is critical; requires PCB redesign due to different pinout and package (QFN-12). |
Compared with LM2576HVT-ADJ/NOPB, LM76003QPWPRQ1 offers higher current and integration at the cost of layout complexity, while LMR51430RGER trades input voltage range for better efficiency and modern packaging - both require schematic and layout changes, making LM2576HVT-ADJ/NOPB preferable for legacy compatibility and thermal simplicity.
Availability
LM2576HVT-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, merchant network PSUs, test equipment, and home appliance control systems requiring stable component supply, long-lifecycle support, and proven thermal reliability in TO-220 packages.
Supply support for LM2576HVT-ADJ/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2576 series was designed as a rugged, easy-to-use replacement for linear regulators in industrial and embedded applications - prioritizing fault protection, thermal robustness, and minimal external component count over high-frequency optimization.
FAQ
What is the maximum input voltage rating for LM2576HVT-ADJ/NOPB?
The LM2576HVT-ADJ/NOPB has an absolute maximum input voltage of 63 V and a recommended operating maximum of 60 V, as specified in Section 6.1 and 6.3 of the SNVS107G datasheet. This HV rating distinguishes it from standard LM2576 variants (40 V max) and enables direct use with 48-V systems including transient spikes.
How does the ON/OFF pin function on LM2576HVT-ADJ/NOPB?
The ON/OFF pin on LM2576HVT-ADJ/NOPB provides TTL-compatible enable control: applying ≥1.4 V places LM2576HVT-ADJ/NOPB in shutdown mode with 50-μA typical standby current, while ≤1.2 V enables normal regulation. The pin must never be left floating and should be pulled to GND for always-on operation.
What is the feedback reference voltage for LM2576HVT-ADJ/NOPB?
The LM2576HVT-ADJ/NOPB uses a precision 1.23 V internal reference at the FEEDBACK pin, with ±4% tolerance over temperature and load. Output voltage is set by VOUT = 1.23 V × (1 + R2/R1), where R1 connects from FEEDBACK to GND and R2 from OUTPUT to FEEDBACK.
Can LM2576HVT-ADJ/NOPB drive a 3-A load continuously?
Yes, LM2576HVT-ADJ/NOPB is rated for 3-A DC output current under recommended operating conditions. Sustained 3-A operation requires proper thermal management: with the KC (TO-220) package mounted to a heatsink, junction temperature remains within −40°C to +125°C limits per thermal data in Section 6.4.
What package type is used by LM2576HVT-ADJ/NOPB?
LM2576HVT-ADJ/NOPB uses the KC package - a 5-pin TO-220 variant with exposed thermal tab electrically connected to GND. Its body size is 10.16 mm × 8.51 mm, and thermal resistance is RθJA = 32.4°C/W on a JEDEC 4-layer board, as documented in the Package Information table and Section 6.4.
LM2576HVT-ADJ/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:
- 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/NOPB FAQ
1.How can I place an order for LM2576HVT-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVT-ADJ/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-ADJ/NOPB reliable?
The price and inventory of LM2576HVT-ADJ/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-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVT-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVT-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVT-ADJ/NOPB?
LM2576HVT-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVT-ADJ/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-ADJ/NOPB?
For technical support, including LM2576HVT-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVT-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2576HVT-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVT-ADJ/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-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVT-ADJ/NOPB?
All LM2576HVT-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVT-ADJ/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-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVT-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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