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Texas Instruments LM2576HVS-3.3
- Part No.:
- LM2576HVS-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVS-3.3.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,502
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Product details
Overview
LM2576HVS-3.3 from Texas Instruments is a monolithic 3-A non-synchronous step-down DC-DC regulator in TO-263 (DDPAK) package, delivering fixed 3.3-V output with ±4% tolerance over line and load, 40–60-V input range, and 52-kHz fixed-frequency operation. It serves as a high-efficiency replacement for linear regulators in industrial power supplies, motor drives, and test equipment.
For engineers reviewing the LM2576HVS-3.3 datasheet, LM2576HVS-3.3 pinout, LM2576HVS-3.3 application, or LM2576HVS-3.3 equivalent, key selection considerations include its HV-rated 60-V max input, thermal performance with RθJA = 42.6°C/W (KTT), shutdown quiescent current of 50 μA, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576HVS-3.3 integrates a 3-A NPN switch, fixed 52-kHz oscillator, error amplifier, bandgap reference (1.23 V), and cycle-by-cycle current limiting. Its architecture uses external diode, inductor, and capacitors to form a buck converter with no synchronous rectification.
It operates in active mode when ON/OFF pin voltage drops below 1.2 V, enters shutdown at >1.4 V (50 μA standby), and reduces switching frequency to ~11 kHz under short-circuit conditions to limit average power dissipation. Thermal shutdown and internal current limit provide full fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full temperature and load range - ensures stable logic supply without external feedback resistors. |
| Input Voltage Range | 6 V to 60 V - supports wide industrial input rails including 24-V, 48-V, and unregulated AC/DC outputs. |
| Output Current | 3 A continuous - sufficient for powering microcontrollers, FPGAs, and peripheral ICs in embedded systems. |
| Switching Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors and simplifies EMI filtering. |
| Efficiency | 75% at 12-VIN/3-AOUT - reduces heat sink requirements versus linear regulators; no heatsink needed at moderate loads. |
| Standby Current | 50 μA typical - enables low-power system sleep modes without compromising fast wake-up response. |
| Saturation Voltage | 1.8 V max at 3 A - defines minimum dropout: VIN(MIN) = VOUT + VSAT ≈ 5.1 V under full load. |
| Current Limit | 4.2–6.9 A - provides robust overload protection while allowing safe startup into capacitive loads. |
Pinout & Package
LM2576HVS-3.3 is housed in a 5-pin DDPAK/TO-263 (KTT) package with exposed thermal pad connected to GND. The package measures 10.16 mm × 8.42 mm and features low thermal resistance (RθJC = 0.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Connects to high-side transistor collector; requires short, low-inductance path to input capacitor to minimize switching noise. |
| 2 - OUTPUT | Switching node | Emitter of internal NPN switch; connects directly to inductor and catch diode cathode - critical for EMI layout. |
| 3 - GROUND | Power ground | Main return path for input/output currents; must be tied to thermal pad and share low-impedance plane with CIN/COUT. |
| 4 - FEEDBACK | Voltage sense | Internally connected to 3.3-V reference; for fixed-output version, this pin is internally tied to output - leave unconnected externally. |
| 5 - ON/OFF | Enable control | TTL-compatible shutdown input; <1.2 V = ON, >1.4 V = OFF; 50-μA standby current enables simple microcontroller control. |
| TAB | Thermal & electrical ground | Exposed copper pad soldered to PCB ground plane - essential for thermal relief and EMI reduction in KTT package. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V output | Eliminates external resistor divider, reducing BOM count and improving accuracy vs. adjustable versions. |
| 60-V maximum input | Supports 48-V industrial buses and transient-tolerant designs without external clamping or pre-regulation. |
| 52-kHz fixed oscillator | Enables predictable EMI spectrum and simplifies filter design versus variable-frequency controllers. |
| Cycle-by-cycle current limit | Prevents inductor saturation and MOSFET failure during output shorts or heavy capacitive loads. |
| Thermal shutdown | Protects device under sustained overload or poor heatsinking; auto-recovery upon cooling. |
| Low-ESR capacitor compatibility | Works with standard electrolytic and ceramic input/output caps - no special low-ESR requirement. |
Applications
| Industrial Motor Drives | Network Equipment PSUs |
|---|---|
Use Scenario: Powering gate drivers, sensors, and MCU cores in 24-V/48-V motor control boards. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying logic-level circuitry with high ripple rejection. Use Value: Delivers 3 A continuously with minimal thermal derating - eliminates need for discrete LDO post-regulation. |
Use Scenario: Secondary regulation stage in merchant server power supplies converting 12-V intermediate bus to 3.3-V logic rail. IC Role / Device Role / Timing Role: Non-isolated step-down converter handling dynamic load steps up to 3 A with fast transient response. Use Value: 75% efficiency at full load reduces board-level heat density versus linear alternatives. |
| Test & Measurement Instruments | Home Appliances Control Boards |
Use Scenario: Providing clean, stable 3.3-V supply for ADC references, FPGA I/O banks, and precision op-amps. IC Role / Device Role / Timing Role: Low-noise DC-DC source with fixed output and integrated current limiting for lab-grade reliability. Use Value: ±4% output tolerance and <100-mV peak-to-peak ripple (with recommended LC filter) meet metrology-grade stability needs. |
Use Scenario: Main 3.3-V supply for microcontroller, display, and communication interfaces in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Robust, cost-optimized buck regulator operating across wide ambient temperatures (−40°C to +125°C). Use Value: TO-263 thermal pad enables direct mounting to metal chassis - simplifies thermal management in sealed enclosures. |
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 | TO-220 (KC) package, 40-V max input, RθJA = 32.4°C/W - higher thermal resistance but lower cost and simpler mounting. | Better suited for lower-power, convection-cooled designs where PCB space allows through-hole assembly. | Select when board layout permits TO-220 and input voltage stays ≤40 V; avoid for 48-V systems or high-ambient environments. |
| LM76003QRNXTQ1 | Synchronous 3.5-A buck, 3.5–60-V input, 2.2-MHz switching, integrated high-/low-side FETs - no external diode required. | Higher efficiency (≥92%), smaller solution size, but requires more complex layout and external compensation. | Choose for new designs requiring >85% efficiency, compact footprint, or automotive qualification (AEC-Q100). |
Compared with LM2576T-3.3, LM2576HVS-3.3 offers 20-V higher input rating and surface-mount compatibility; compared with LM76003QRNXTQ1, it trades efficiency and integration for simplicity, cost, and proven reliability in legacy industrial systems.
Availability
LM2576HVS-3.3 is available at Aetrix Electronics and suitable for industrial motor drives, network equipment PSUs, and test instrumentation requiring stable component supply across extended product lifecycles.
Supply support for LM2576HVS-3.3 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 rugged, easy-to-use SIMPLE SWITCHER® solution for replacing linear regulators in cost-sensitive industrial and commercial power systems - prioritizing fault tolerance, minimal external components, and wide input range.
FAQ
What is the maximum input voltage rating for LM2576HVS-3.3?
The LM2576HVS-3.3 supports a maximum input voltage of 60 V, verified per Absolute Maximum Ratings (63 V transient). This HV rating distinguishes it from the standard LM2576 (40 V max) and enables use in 48-V industrial and telecom applications without external pre-regulation.
Does LM2576HVS-3.3 require external feedback resistors?
No. The LM2576HVS-3.3 is a fixed-output variant - its feedback pin is internally connected to the 3.3-V reference and output node. External resistors are unnecessary, eliminating tuning errors and reducing component count versus the adjustable LM2576ADJ version.
How does the ON/OFF pin function on LM2576HVS-3.3?
The ON/OFF pin on LM2576HVS-3.3 provides TTL-compatible enable control: logic low (<1.2 V) activates regulation, while logic high (>1.4 V) places LM2576HVS-3.3 in shutdown with 50-μA typical standby current. It must never be left floating and is commonly tied to GND or driven by a microcontroller GPIO.
What thermal performance can be expected from LM2576HVS-3.3 in its KTT package?
In the DDPAK/TO-263 (KTT) package, LM2576HVS-3.3 has RθJA = 42.6°C/W (JEDEC 4-layer board). With ≥1.6 in² copper area connected to the thermal pad, RθJA improves to 32°C/W - enabling 3-A operation at +85°C ambient without forced air, per thermal characterization data in Section 6.4.
Is LM2576HVS-3.3 RoHS-compliant and lead-free?
Yes. LM2576HVS-3.3 is manufactured in accordance with TI's RoHS-compliant and lead-free packaging standards, as confirmed in the official TI Product Folder and orderable addendum - compliant with JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3).
LM2576HVS-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2576HVS-3.3 FAQ
1.How can I place an order for LM2576HVS-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVS-3.3 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 LM2576HVS-3.3 reliable?
The price and inventory of LM2576HVS-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576HVS-3.3 is usually 5 days.
3.What payment methods are accepted for LM2576HVS-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVS-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVS-3.3?
LM2576HVS-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVS-3.3 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 LM2576HVS-3.3?
For technical support, including LM2576HVS-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVS-3.3 requirements.
6.How does Aetrix verify that LM2576HVS-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2576HVS-3.3 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 LM2576HVS-3.3 meets industry standards.
7.What is the process for return or replacement of LM2576HVS-3.3?
All LM2576HVS-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVS-3.3, 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 LM2576HVS-3.3 part is unused and in its original packaging.
Return procedure for LM2576HVS-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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