My Inquiry
My Account
Texas Instruments LM2576HVSX-3.3
- Part No.:
- LM2576HVSX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2576HVSX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,254
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2576HVSX-3.3 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 wide input range, 52-kHz fixed-frequency operation, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting - used in industrial power supplies, motor drives, and test equipment requiring robust, low-component-count buck regulation.
For engineers reviewing the LM2576HVSX-3.3 datasheet, LM2576HVSX-3.3 pinout, LM2576HVSX-3.3 application, or LM2576HVSX-3.3 equivalent, key selection considerations include HV input capability (60 V max), TO-263-5 (KTT) package thermal performance, ON/OFF logic control interface, feedback pin configuration for fixed-output use, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2576HVSX-3.3 implements a monolithic buck topology with an internal NPN power switch, fixed 52-kHz oscillator, and error amplifier referenced to a 1.23-V bandgap. It operates in continuous conduction mode under full load and transitions to discontinuous mode at light loads without instability.
Its functional block includes undervoltage lockout (UVLO) inherent to the HV version, TTL-compatible ON/OFF control with 50-μA standby current, and cycle-by-cycle current limiting set at 4.2–6.9 A typical, enabling reliable overload and short-circuit protection without external sensing components.
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 resistor divider. |
| Input Voltage Range | 6 V to 60 V (HV version) - supports wide-range industrial inputs including 48-V telecom and unregulated 24–48-V systems. |
| Output Current | 3 A DC continuous - sufficient to power FPGA I/O banks, microcontroller cores, or multiple peripheral ICs from a single regulator. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current toroidal inductors and simplifies EMI filtering vs. MHz-range converters. |
| Efficiency | 75% at 12 VIN/3.3 VOUT/3 A - reduces thermal load versus linear regulators; eliminates need for large heatsinks in many applications. |
| Standby Current | 50 μA typical at ON/OFF = HIGH - enables low-power system-level sleep modes without auxiliary LDOs. |
| Saturation Voltage | 1.4–2.0 V at 3 A - defines minimum dropout (VIN(min) ≈ VOUT + VSAT + diode drop), critical for high-VOUT designs. |
| Thermal Resistance | RθJA = 42.6°C/W (KTT package, JEDEC 4-layer board) - guides copper pour sizing for thermal management in sealed enclosures. |
Pinout & Package
LM2576HVSX-3.3 uses the KTT (DDPAK/TO-263-5) surface-mount package with 10.16 mm × 8.42 mm body size and thermally enhanced exposed tab connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. VIN | Power input | Connects to high-side NPN collector; requires low-ESR input capacitor placed within 5 mm for stability and EMI control. |
| 2. OUTPUT | Switching node | Drives external catch diode and inductor; high dv/dt node - must minimize trace area and avoid routing near sensitive analog signals. |
| 3. GROUND | Power return | Main power ground reference; ties to exposed tab - requires solid thermal pad connection to PCB ground plane for heat dissipation. |
| 4. FEEDBACK | Voltage sense | Internally tied to 3.3-V output in fixed versions; leave unconnected (NC) - not used for regulation but must be decoupled if floating. |
| 5. ON/OFF | Enable control | TTL-compatible digital input: <1.2 V = active, >1.4 V = shutdown; 50-μA standby draw allows direct MCU GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| Wide-input HV operation | 60 V max input enables direct regulation from 48-V battery or PoE++ sources without pre-regulation stage. |
| Integrated protection | Cycle-by-cycle current limit + thermal shutdown eliminate need for external fault-handling circuitry in motor drive or industrial PLC designs. |
| Low external component count | Only four external parts required (inductor, diode, input/output caps) - reduces BOM cost and layout complexity vs. controller-based solutions. |
| Standard inductor compatibility | Optimized for off-the-shelf 15–100-μH shielded power inductors - avoids custom magnetics and accelerates prototyping. |
| Fixed-output precision | ±4% output tolerance over full temperature and load range - meets requirements for powering 3.3-V microcontrollers and FPGAs without post-regulation. |
Applications
| Industrial Motor Drives | Test & Measurement Equipment |
|---|---|
Use Scenario: Powering gate drivers, position sensors, and MCU peripherals in 24–48-V brushless motor controllers. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying logic rails and isolated communication interfaces (RS-485, CAN). Use Value: 60-V HV rating tolerates bus transients during motor commutation; 3-A output supports simultaneous operation of multiple subsystems. |
Use Scenario: Generating stable 3.3-V supply for ADC front-ends, FPGA configuration, and display controllers in portable bench instruments. IC Role / Device Role / Timing Role: Main DC-DC converter providing low-noise, well-regulated power to mixed-signal signal chains. Use Value: Fixed 3.3-V output eliminates trimming resistors; ±4% tolerance ensures consistent ADC reference accuracy across temperature. |
| Merchant Network PSU | Home Appliance Control Boards |
Use Scenario: Secondary-side regulation in AC-DC PSUs for Ethernet switches and PoE injectors where 48-V input is common. IC Role / Device Role / Timing Role: Step-down converter converting 48-V intermediate bus to 3.3-V logic supply for switch ASICs and PHYs. Use Value: Wide 6–60-V input range accommodates both nominal 48-V and brownout conditions down to 6 V without dropout. |
Use Scenario: Powering main control MCU, touch panel, and Wi-Fi module in smart refrigerators and washing machines. IC Role / Device Role / Timing Role: High-reliability buck regulator converting 12–24-V battery or adapter input to 3.3-V system rail. Use Value: Thermal shutdown and current limiting protect against sustained overloads caused by jammed motors or sensor faults. |
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-3.3 | Max input voltage 40 V (vs. 60 V); identical pinout, package, and electrical specs otherwise. | Not suitable for 48-V systems with transient headroom requirements; limited to 24-V or lower input rails. | Select LM2576SX-3.3 only when input never exceeds 40 V and cost sensitivity outweighs HV margin. |
| LM76003QRNLRQ1 | Synchronous 3.5-A converter, 3.5–60-V input, 300-kHz–2.2-MHz adjustable frequency, smaller QFN package. | Higher efficiency (>90%), lower EMI, and smaller solution size - but requires more external components and layout care. | Choose LM76003QRNLRQ1 when efficiency, footprint, or EMI compliance are prioritized over design simplicity and legacy compatibility. |
Compared with LM2576HVSX-3.3, LM2576SX-3.3 trades HV capability for lower cost in sub-40-V systems, while LM76003QRNLRQ1 replaces non-synchronous simplicity with synchronous efficiency and flexibility - making LM2576HVSX-3.3 optimal for rugged, low-complexity 48-V industrial power conversion.
Availability
LM2576HVSX-3.3 is available at Aetrix Electronics and suitable for industrial motor drives, merchant network PSUs, and home appliance control boards requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM2576HVSX-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 LM2576xx series was designed as a robust, easy-to-use replacement for linear regulators in medium-power industrial and commercial applications - emphasizing simplicity, fault resilience, and wide-input operation without complex compensation.
FAQ
What is the maximum input voltage rating for LM2576HVSX-3.3?
The LM2576HVSX-3.3 has an absolute maximum input voltage of 63 V and a recommended operating maximum of 60 V. This HV rating distinguishes it from the standard LM2576 (40 V max) and enables direct regulation from 48-V systems with transient margin. Always observe derating guidelines per TI's SNVS107G datasheet Section 6.1.
Does LM2576HVSX-3.3 require an external feedback resistor divider?
No. The LM2576HVSX-3.3 is a fixed-output variant - its internal feedback network is factory-trimmed to 3.3 V, so the FEEDBACK pin is internally connected and must be left unconnected (NC) in PCB layout. External resistors are only required for the adjustable (ADJ) version of the LM2576 family.
How does the ON/OFF pin function on LM2576HVSX-3.3?
The ON/OFF pin on LM2576HVSX-3.3 provides TTL-compatible enable control: logic-low (<1.2 V) enables regulation, logic-high (>1.4 V) places the device in shutdown with 50-μA typical standby current. It is not inverted - tying this pin to GND activates the regulator, and pulling it to VIN disables it.
What package type is used by LM2576HVSX-3.3, and how is thermal management handled?
LM2576HVSX-3.3 uses the KTT (DDPAK/TO-263-5) surface-mount package with an exposed thermal pad electrically connected to GND. Effective thermal management requires soldering the tab to a minimum 1-in² copper pour on the PCB layer, which reduces RθJA from 42.6°C/W to ~32°C/W per TI's characterization data.
Can LM2576HVSX-3.3 be used in automotive applications?
The LM2576HVSX-3.3 is not AEC-Q100 qualified and lacks automotive-specific features like extended temperature screening or enhanced ESD robustness. While it operates from −40°C to +125°C junction temperature, TI recommends automotive-grade alternatives such as the LM61480-Q1 for safety-critical vehicle systems.
LM2576HVSX-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:
- Tape & Reel (TR)
- 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)
LM2576HVSX-3.3 FAQ
1.How can I place an order for LM2576HVSX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576HVSX-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 LM2576HVSX-3.3 reliable?
The price and inventory of LM2576HVSX-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 LM2576HVSX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2576HVSX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576HVSX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576HVSX-3.3?
LM2576HVSX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576HVSX-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 LM2576HVSX-3.3?
For technical support, including LM2576HVSX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576HVSX-3.3 requirements.
6.How does Aetrix verify that LM2576HVSX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2576HVSX-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 LM2576HVSX-3.3 meets industry standards.
7.What is the process for return or replacement of LM2576HVSX-3.3?
All LM2576HVSX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576HVSX-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 LM2576HVSX-3.3 part is unused and in its original packaging.
Return procedure for LM2576HVSX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2576HVSX-3.3 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
