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Texas Instruments LM2576HVSX-5.0/NOPB
- Part No.:
- LM2576HVSX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVSX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
LM2576HVSX-5.0/NOPB from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-263 (DDPAK) package, delivering fixed 5.0 V output with ±4% tolerance over line and load, supporting 8–60 V input, and featuring 52-kHz fixed-frequency operation, TTL-compatible ON/OFF control, and cycle-by-cycle current limiting for motor drives and industrial power supplies.
For engineers reviewing the LM2576HVSX-5.0/NOPB datasheet, LM2576HVSX-5.0/NOPB pinout, LM2576HVSX-5.0/NOPB application, or LM2576HVSX-5.0/NOPB equivalent, key selection considerations include its 60-V HV input rating, 3-A continuous output capability, thermal performance on PCB copper planes, and compatibility with standard off-the-shelf inductors in buck converter designs.
Technical Context
The LM2576HVSX-5.0/NOPB implements a fixed-frequency PWM buck topology with internal 52-kHz oscillator, integrated 3-A NPN switch, and voltage-mode error amplifier referenced to a 1.23-V internal bandgap. It operates in continuous conduction mode under full load and transitions to discontinuous mode at light loads without instability.
Its functional architecture includes undervoltage lockout (enabled by VIN ≥ 8 V), cycle-by-cycle peak current limiting (ICL = 4.2–6.9 A), thermal shutdown, and TTL-level ON/OFF pin logic (VIH ≥ 2.2 V for shutdown, VIL ≤ 1.2 V for active). The feedback pin is internally tied to the 5-V output, eliminating external resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full temperature and load range - ensures stable logic supply without external feedback tuning. |
| Input Voltage Range | 8 V to 60 V - supports wide-range industrial, automotive, and telecom inputs including 48-V systems. |
| Continuous Output Current | 3 A - delivers sufficient power for microcontrollers, sensors, and peripheral rails without external current boosting. |
| Oscillator Frequency | 47–58 kHz (typ. 52 kHz) - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Standby Quiescent Current | 50 µA (typ.) - allows low-power system sleep modes without significant battery drain. |
| Thermal Resistance (RθJA) | 42.6°C/W (TO-263, 1-in² copper) - defines minimum PCB copper area needed for thermal management at full load. |
| Saturation Voltage (VSAT) | 1.4–2.0 V at 3 A - determines conduction loss and impacts efficiency at low VIN/VOUT ratios. |
| Current Limit Threshold | 4.2–6.9 A (typ. 5.8 A) - provides robust overload protection while allowing startup surge margin. |
Pinout & Package
LM2576HVSX-5.0/NOPB uses the KTT (DDPAK/TO-263-5) surface-mount package with exposed thermal pad connected to GND. Body size is 10.16 mm × 8.42 mm. Thermal performance improves significantly with ≥1 in² PCB copper area connected to the tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | High-side switch collector input | Connects directly to unregulated DC input and input bypass capacitor; requires shortest possible trace to minimize switching noise. |
| 2 - OUTPUT | Switch emitter node | Drives external inductor and catch diode cathode; forms high-frequency switching node requiring tight layout and ground return path. |
| 3 - GROUND | Power and signal reference | Common return for input/output capacitors, feedback, and ON/OFF; must be low-inductance connection to minimize noise coupling. |
| 4 - FEEDBACK | Regulation sense input | Internally connected to 5-V output; no external divider required - simplifies design and eliminates resistor tolerance errors. |
| 5 - ON/OFF | Enable/disable control | TTL-compatible: <1.2 V = active, >2.2 V = shutdown; 50-µA standby current enables direct MCU GPIO control. |
| TAB | Thermal and electrical ground | Exposed metal pad soldered to PCB copper plane for heat dissipation and low-impedance GND path - critical for thermal reliability at 3-A load. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output with internal feedback | Eliminates external resistor network, reducing BOM count, layout area, and calibration drift over temperature. |
| 60-V maximum input voltage (HV version) | Enables direct regulation from 48-V industrial buses or transient-tolerant 36-V automotive systems without pre-regulation. |
| Requires only four external components | Input cap, output cap, inductor, and catch diode - minimizes design time and failure points in cost-sensitive applications. |
| Cycle-by-cycle current limiting | Prevents switch destruction during short-circuit or overload by clamping peak inductor current to ~5.8 A. |
| TTL-compatible ON/OFF pin | Allows direct interface with 3.3-V or 5-V microcontrollers without level-shifting, enabling precise power sequencing. |
| Thermal shutdown protection | Shuts down regulator when junction temperature exceeds 150°C, preventing permanent damage during sustained overload or poor heatsinking. |
Applications
| Industrial Motor Drives | Merchant Network PSU |
|---|---|
Use Scenario: Powering gate drivers, logic controllers, and sensor interfaces in 24–48-V DC-fed brushless motor inverters. IC Role / Device Role / Timing Role: Primary 5-V rail generator converting unregulated bus voltage to clean, regulated logic supply with fast transient response. Use Value: Delivers 3-A peak current during gate driver switching bursts while maintaining ±4% regulation across 8–60-V input transients. | Use Scenario: Secondary-side 5-V bias supply in multi-output AC/DC server PSUs for fan controllers, SMBus interfaces, and PMBus supervisors. IC Role / Device Role / Timing Role: Isolated auxiliary regulator receiving DC from main transformer secondary, providing stable 5-V reference independent of primary control loop. Use Value: Operates reliably across wide input variation caused by main output loading, with 52-kHz frequency easing EMI filter design in dense board layouts. |
| Home Appliances | Test & Measurement Equipment |
Use Scenario: Main 5-V supply for MCU, display, and communication modules in washing machines, HVAC controls, and smart ovens. IC Role / Device Role / Timing Role: Central power converter stepping down rectified AC-derived DC (e.g., 30–40 V) to isolated 5-V logic rail. Use Value: Withstands line surges up to 60 V and maintains regulation during compressor startup current dips due to wide input range and robust current limiting. | Use Scenario: Precision 5-V analog and digital supply in portable oscilloscopes, multimeters, and signal generators where low-noise and stability are critical. IC Role / Device Role / Timing Role: Low-ripple regulated source feeding ADC references, op-amp rails, and FPGA I/O banks - often paired with LC post-filtering. Use Value: Achieves <50 mVpp output ripple with standard 150-µH inductor and 2000-µF output capacitor, meeting noise requirements for 12-bit+ measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576SX-5.0/NOPB | Max input voltage limited to 40 V; identical pinout, package, and 5-V output spec. | Suitable for 24-V or lower-input systems; not rated for 48-V bus transients or HV industrial environments. | Select when input never exceeds 40 V and cost sensitivity outweighs HV margin. |
| LM76003QRNTRQ1 | Synchronous 3.5-A converter, 3.5–60-V input, 2.2-MHz switching, integrated high-/low-side FETs. | Higher efficiency (>90%), smaller solution size, but requires more complex layout and external compensation. | Choose for space-constrained, high-efficiency designs where thermal headroom is limited and layout expertise is available. |
Compared with LM2576HVSX-5.0/NOPB, LM2576SX-5.0/NOPB offers identical functionality at lower cost but sacrifices 20-V input headroom, while LM76003QRNTRQ1 delivers superior efficiency and integration at the expense of design simplicity and external component count.
Availability
LM2576HVSX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, merchant network power supplies, home appliance control boards, and test equipment requiring stable component supply with long lifecycle support.
Supply support for LM2576HVSX-5.0/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and consumer reach.
The LM2576xx series was designed as a drop-in, high-current replacement for linear regulators in cost-sensitive, thermally constrained buck converter applications - emphasizing simplicity, fault protection, and compatibility with standard magnetics.
FAQ
What is the maximum input voltage rating for LM2576HVSX-5.0/NOPB?
The LM2576HVSX-5.0/NOPB has a maximum input voltage rating of 60 V, confirmed in the Absolute Maximum Ratings table and Recommended Operating Conditions section of the TI datasheet SNVS107G. This HV rating distinguishes it from the standard LM2576 (40 V max) and enables use in 48-V industrial and telecom systems with transient margin. Operation above 60 V risks permanent damage.
Does LM2576HVSX-5.0/NOPB require external feedback resistors?
No, LM2576HVSX-5.0/NOPB does not require external feedback resistors. As a fixed 5.0-V output variant, its FEEDBACK pin is internally connected to the output, eliminating the need for an external resistor divider. This simplifies layout, reduces component count, and avoids tolerance-induced output voltage drift - a key differentiator from the adjustable LM2576HV-ADJ version.
What package type is used by LM2576HVSX-5.0/NOPB?
LM2576HVSX-5.0/NOPB uses the KTT package - a 5-pin DDPAK/TO-263 surface-mount variant with an exposed thermal pad. Its nominal body size is 10.16 mm × 8.42 mm. The thermal pad must be soldered to a PCB copper plane for effective heat dissipation, especially at full 3-A load, as specified in TI's thermal characterization data.
How does the ON/OFF pin function on LM2576HVSX-5.0/NOPB?
The ON/OFF pin on LM2576HVSX-5.0/NOPB provides TTL-compatible enable control: applying <1.2 V activates regulation, while >2.2 V places the device in shutdown mode with 50-µA typical standby current. This allows direct interfacing with microcontroller GPIOs without level shifters. The pin must never be left floating, as undefined logic states may cause erratic behavior or increased quiescent current.
What is the typical efficiency of LM2576HVSX-5.0/NOPB at full load?
LM2576HVSX-5.0/NOPB achieves 77% typical efficiency at VIN = 12 V, VOUT = 5 V, and ILOAD = 3 A, per Section 6.6 of the TI datasheet SNVS107G. Efficiency rises to ~88% at higher input-to-output ratios (e.g., 15 V → 5 V), reflecting its non-synchronous architecture. Actual efficiency depends on external component selection - particularly inductor DCR, diode forward voltage, and capacitor ESR.
LM2576HVSX-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2576HVSX-5.0/NOPB FAQ
1.How can I place an order for LM2576HVSX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVSX-5.0/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 LM2576HVSX-5.0/NOPB reliable?
The price and inventory of LM2576HVSX-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576HVSX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2576HVSX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVSX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVSX-5.0/NOPB?
LM2576HVSX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVSX-5.0/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 LM2576HVSX-5.0/NOPB?
For technical support, including LM2576HVSX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVSX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2576HVSX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2576HVSX-5.0/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 LM2576HVSX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2576HVSX-5.0/NOPB?
All LM2576HVSX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVSX-5.0/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 LM2576HVSX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2576HVSX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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