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onsemi LM2576TV-3.3
- Part No.:
- LM2576TV-3.3
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576TV-3.3.pdf
- Description:
- IC REG BUCK 3.3V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,908
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Product details
Overview
LM2576TV-3.3 from onsemi is a monolithic 3.0 A, 52 kHz fixed-frequency step-down (buck) switching regulator in TO-220 package with fixed 3.3 V output, ±4% output voltage tolerance over line and load, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control. It delivers high efficiency-up to 75% at 12 V input/3.0 A load-and requires only four external components for operation in industrial power supplies.
For engineers reviewing the LM2576TV-3.3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 7.0–40 V input range, 3.3 V ±4% regulation accuracy, 52 kHz internal oscillator, and integrated protection features including thermal shutdown and current limit.
Technical Context
The LM2576TV-3.3 implements a voltage-mode controlled buck converter architecture with an internal 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and 1.0 A NPN switch driver. Its feedback loop senses output voltage directly at Pin 4 for fixed-output versions, eliminating external resistor dividers.
It operates in continuous conduction mode with a maximum duty cycle of 98%, saturation voltage ≤1.8 V at 3.0 A, and built-in cycle-by-cycle current limiting (peak current 4.2–6.9 A). Standby quiescent current is 80 µA typical when ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over −40 °C to +125 °C, 6.0–40 V input, 0.5–3.0 A load - ensures stable logic supply for microcontrollers and FPGAs. |
| Max Output Current | 3.0 A DC - supports single-rail 3.3 V systems powering SoCs, sensors, or communication interfaces without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - accommodates unregulated 12 V/24 V industrial rails, automotive battery inputs (with transient clamping), and wide-input DC-DC pre-regulation. |
| Switching Frequency | 52 kHz (±10% over temperature) - enables use of low-cost, standard off-the-shelf inductors (e.g., 100 µH Pulse PE-92108) and simplifies EMI filtering. |
| Efficiency | 75% typical at Vin = 12 V, Iout = 3.0 A - reduces thermal load vs. linear regulators, often eliminating need for heatsink in moderate ambient conditions. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limiting - prevents damage during overload, short-circuit, or inadequate heatsinking without external circuitry. |
| ON/OFF Control | TTL-compatible; <1.4 V = ON, >2.2 V = OFF; 80 µA standby current - enables low-power system sleep modes and sequenced power-up. |
Pinout & Package
LM2576TV-3.3 uses the TO-220-5 (Case 314B) package with heatsink surface electrically connected to Pin 3 (GND). The exposed tab provides low thermal resistance (RJC = 5.0 °C/W) and must be mounted to a heatsink or copper pour for full 3.0 A operation at elevated ambient temperatures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7.0–40 V unregulated DC; requires local 100 µF/75 V aluminum electrolytic bypass capacitor to suppress switching transients. |
| 2 - Output | Emiter of internal NPN switch | Drives inductor; saturation voltage ≤1.8 V at 3.0 A; PCB copper area must be minimized to reduce coupling into sensitive analog circuits. |
| 3 - GND | Circuit ground reference | Common return for input cap, output cap, catch diode, and heatsink; single-point grounding recommended to avoid ground loops. |
| 4 - Feedback | Regulated output sense node | Internally connected to 3.3 V divider; no external resistors required - simplifies layout and improves regulation stability vs. adjustable variants. |
| 5 - ON/OFF | Logic-controlled enable/disable | Active-low enable (0 V = ON); 5 V logic high disables regulator and reduces total supply current to ~80 µA - ideal for system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output | Eliminates external feedback resistors, reducing BOM count, layout complexity, and potential drift from resistor tolerance/temperature coefficients. |
| Guaranteed 3.0 A output | Rated performance across full temperature range (−40 °C to +125 °C junction), enabling reliable operation in industrial and automotive under-hood environments. |
| 52 kHz fixed oscillator | Enables predictable EMI profile and compatibility with standardized, low-cost power inductors optimized for this frequency (e.g., Pulse PE-92108). |
| Integrated protection | Thermal shutdown and cycle-by-cycle current limiting operate autonomously - no external IC or discrete components needed for fault recovery. |
| TTL shutdown capability | Supports microcontroller GPIO direct drive without level-shifting; 80 µA standby current allows battery-backed systems to maintain ultra-low sleep power. |
Applications
| Industrial PLC I/O Module | Embedded Microcontroller Power Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 3.3 V power to isolated digital I/O channels in programmable logic controllers operating from 24 V DC field buses. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V bus to 3.3 V logic rail; handles load steps up to 3.0 A during simultaneous channel activation. Use Value: High efficiency (≥70% at 24 V→3.3 V) minimizes heat buildup in sealed enclosures; thermal shutdown prevents latch-up during sustained overloads. |
Use Scenario: Powering ARM Cortex-M or RISC-V SoCs, flash memory, and peripheral interfaces in edge-node gateways with limited board space and thermal budget. IC Role / Device Role / Timing Role: Main DC-DC converter delivering stable 3.3 V at up to 3.0 A; synchronized via ON/OFF pin to MCU's low-power sleep states. Use Value: 80 µA standby current extends battery life in backup scenarios; ±4% output tolerance meets core voltage requirements of modern MCUs. |
| Automotive Body Control Module | Test Equipment Power Subsystem |
|
Use Scenario: Generating 3.3 V for CAN transceivers, LIN interface ICs, and sensor signal conditioning in 12 V vehicle electrical systems with cold-crank (6 V) and load-dump (40 V) transients. IC Role / Device Role / Timing Role: Input-stage buck regulator accepting 7–40 V input; paired with TVS and input filter to survive automotive transients. Use Value: Wide input range and internal current limiting protect against overvoltage/overload events; TO-220 package allows bolt-on heatsinking for under-hood reliability. |
Use Scenario: Supplying 3.3 V to FPGA configuration circuitry, ADC front-ends, and digital logic in benchtop test instruments requiring low-noise, repeatable voltage rails. IC Role / Device Role / Timing Role: Fixed-output switching regulator replacing linear regulators to reduce thermal stress during extended calibration cycles. Use Value: 75% efficiency at full load cuts power dissipation by >60% vs. linear alternative; fixed 3.3 V eliminates resistor matching errors affecting 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 |
|---|---|---|---|
| LM2576T-3.3 | Same silicon, TO-220-5 package but Case 314D (no heatsink tab connection to Pin 3); RJA = 65 °C/W vs. 65 °C/W for TV suffix - identical thermal performance in free-air, slightly lower thermal resistance with heatsink mounting. | Identical functional behavior and pinout; differs only in mechanical heatsink interface - suitable where isolated mounting or non-grounded heatsink is preferred. | Select LM2576T-3.3 if heatsink isolation from GND is required; otherwise LM2576TV-3.3 offers marginally better thermal path when heatsink is grounded. |
| MP1584EN-LF-Z | 3 A synchronous buck regulator, 2 MHz switching, adjustable output (0.8–20 V), smaller SOIC-8 package; no integrated catch diode required; higher efficiency (≥85% at 12 V→3.3 V) but requires external compensation. | Targets space-constrained, high-efficiency designs; lacks built-in ON/OFF logic threshold - requires external pull-up/pull-down for enable control. | Choose MP1584EN-LF-Z for compact, high-frequency designs needing >80% efficiency; retain LM2576TV-3.3 for simplicity, proven reliability, and direct TTL shutdown. |
Compared with LM2576T-3.3, LM2576TV-3.3 provides a grounded heatsink interface for marginally improved thermal performance in high-power continuous operation; versus MP1584EN-LF-Z, it trades higher board area and lower efficiency for zero-compensation design, integrated protection, and native logic-level enable - favoring robustness over miniaturization.
Availability
LM2576TV-3.3 is available at Aetrix Electronics and suitable for industrial PLCs, embedded microcontroller power supplies, automotive body control modules, and test equipment requiring stable component supply with long-term lifecycle support.
Supply support for LM2576TV-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
onsemi is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications, with leadership in power management, analog, and sensing technologies.
The LM2576 series was designed as a rugged, easy-to-use buck regulator family targeting cost-sensitive, high-reliability industrial and automotive power conversion - emphasizing minimal external parts, integrated protection, and wide input voltage tolerance.
FAQ
What is the maximum input voltage rating for LM2576TV-3.3?
The absolute maximum input voltage for LM2576TV-3.3 is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Exceeding 40 V may trigger internal protection or cause reliability degradation. For automotive applications with load-dump transients, external clamping (e.g., TVS diode) is advised before the LM2576TV-3.3 input.
Does LM2576TV-3.3 require an external catch diode, and what type is recommended?
Yes, LM2576TV-3.3 requires an external Schottky catch diode (e.g., MBR360 or 1N5822) connected between Pin 2 (Output) and GND. The diode must handle ≥3.6 A peak current and ≥50 V reverse voltage. Schottky types are mandatory due to low forward voltage and fast recovery - standard PN diodes cause excessive losses and instability.
Can LM2576TV-3.3 be used without a heatsink?
LM2576TV-3.3 can operate without a heatsink at ≤1.5 A output current and ≤50 °C ambient, based on its RJA = 65 °C/W. At full 3.0 A load, junction temperature rise exceeds safe limits without heatsinking; the TO-220 tab must be mounted to ≥2 in² copper pour or an external heatsink to maintain TJ ≤ 125 °C.
How does the ON/OFF pin function on LM2576TV-3.3?
The ON/OFF pin (Pin 5) enables TTL-compatible shutdown: <1.4 V (or open) = regulator ON; >2.2 V = regulator OFF with 80 µA standby current. No pull-up resistor is needed - driving it directly from a microcontroller GPIO suffices. Leaving it floating defaults to ON, ensuring fail-safe startup.
What is the output voltage tolerance of LM2576TV-3.3 over temperature and load?
LM2576TV-3.3 guarantees ±4% output voltage tolerance over full operating conditions: −40 °C to +125 °C junction temperature, 6.0–40 V input, and 0.5–3.0 A load. At 25 °C, typical output is 3.30 V with min/max of 3.234 V and 3.366 V - meeting tight 3.3 V logic rail requirements for modern digital ICs.
LM2576TV-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 40V
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2576TV-3.3 FAQ
1.How can I place an order for LM2576TV-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576TV-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 LM2576TV-3.3 reliable?
The price and inventory of LM2576TV-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 LM2576TV-3.3 is usually 5 days.
3.What payment methods are accepted for LM2576TV-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576TV-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576TV-3.3?
LM2576TV-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576TV-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 LM2576TV-3.3?
For technical support, including LM2576TV-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576TV-3.3 requirements.
6.How does Aetrix verify that LM2576TV-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2576TV-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 LM2576TV-3.3 meets industry standards.
7.What is the process for return or replacement of LM2576TV-3.3?
All LM2576TV-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2576TV-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 LM2576TV-3.3 part is unused and in its original packaging.
Return procedure for LM2576TV-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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