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onsemi LM2576TV-3.3G
- Part No.:
- LM2576TV-3.3G
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2576TV-3.3G.pdf
- Description:
- IC REG BUCK 3.3V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:166
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Product details
Overview
LM2576TV-3.3G from onsemi is a monolithic 3.0 A, 52 kHz fixed-frequency step-down (buck) switching regulator with fixed 3.3 V output, TO-220-5 package, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It delivers high-efficiency power conversion for industrial control rails and embedded system main supplies.
For engineers reviewing the LM2576TV-3.3G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain-ready availability details - all grounded in the official ON Semiconductor LM2576/D Rev. 11 datasheet.
Technical Context
The LM2576TV-3.3G implements a voltage-mode controlled buck topology with an internal 52 kHz oscillator, 1.235 V bandgap reference, and error amplifier driving a 1.0 A NPN switch. Its feedback loop uses a fixed internal resistor divider for 3.3 V regulation, eliminating external programming components.
It features TTL-compatible ON/OFF control (1.4 V threshold), 80 µA standby quiescent current, and protection circuitry including thermal shutdown and peak current limiting (typ. 5.8 A at 25 °C). The device operates across −40 °C to +125 °C junction temperature with input voltage range 7.0–40 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% (3.135–3.465 V) over full load and temperature - ensures stable logic rail compliance for 3.3 V microcontrollers and FPGAs. |
| Max Output Current | 3.0 A continuous - supports mid-power applications like sensor hubs or communication modules without external current boosting. |
| Input Voltage Range | 7.0 V to 40 V - accommodates wide-input industrial DC sources (e.g., 12 V/24 V battery or unregulated wall adapters). |
| Switching Frequency | 52 kHz (±10% over temp) - enables use of low-cost, standard off-the-shelf inductors (e.g., Pulse PE-92108) and simplifies EMI filtering. |
| Efficiency | 75% at 12 VIN/3.0 AOUT - reduces thermal load vs. linear regulators, often eliminating need for heatsink in moderate ambient conditions. |
| Quiescent Current | 5.0–9.0 mA active, 80 µA in shutdown - enables low-power standby modes in battery-backed systems. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload, short-circuit, or inadequate heatsinking. |
Pinout & Package
LM2576TV-3.3G uses the TO-220-5 package (Case 314B), with heatsink surface electrically connected to Pin 3 (GND). The package is Pb-free and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR input capacitor to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 3.3 V; saturation voltage ≤1.8 V at 3 A - impacts dropout and efficiency at low VIN. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, diode cathode, and heatsink; must be single-point grounded per layout guidelines. |
| 4 - Feedback | Regulation sense node | Internally tied to fixed 3.3 V divider; not accessible externally - eliminates tuning but guarantees accuracy and stability. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2 V) disables regulator, dropping IQ to 80 µA; open or logic-low (<1.0 V) enables operation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output | Eliminates external feedback resistors - reduces BOM count, PCB area, and calibration risk for standard logic supply rails. |
| 52 kHz fixed oscillator | Enables predictable EMI spectrum and compatibility with low-cost, widely available 100 µH power inductors. |
| Integrated current limit & thermal shutdown | Provides autonomous fault recovery without external sensing - critical for unattended industrial equipment. |
| TTL shutdown capability | Allows direct interfacing with microcontroller GPIOs for power sequencing and sleep/wake control. |
| Requires only 4 external components | Minimizes design time and validation effort: input cap, output cap, catch diode (e.g., MBR360), and inductor. |
Applications
| Industrial PLC I/O Module Power | Embedded System Main Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 3.3 V to microcontroller, ADC, and digital isolators in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary DC-DC buck converter delivering isolated 3.3 V rail from 24 V field bus input. Use Value: High efficiency (75%) minimizes heat buildup in sealed enclosures; thermal shutdown protects against ambient temperature excursions. |
Use Scenario: Generating main 3.3 V supply for ARM-based edge computing nodes with Ethernet and USB peripherals. IC Role / Device Role / Timing Role: Step-down regulator converting 12 V board-level input to stable 3.3 V core voltage. Use Value: 3.0 A output supports burst-mode CPU loads; 52 kHz frequency avoids audible noise and eases EMI filter design. |
| Test Equipment Auxiliary Rail | Medical Sensor Interface Power |
|
Use Scenario: Powering analog front-end circuitry (op-amps, references) in portable multimeters and signal analyzers. IC Role / Device Role / Timing Role: Low-noise pre-regulator feeding LDOs for precision analog sections. Use Value: Fixed 3.3 V output ensures consistent biasing; ±4% tolerance meets typical 12-bit ADC reference requirements. |
Use Scenario: Supplying isolated 3.3 V to patient-connected biosensor amplifiers and wireless telemetry ICs. IC Role / Device Role / Timing Role: Safety-isolated secondary-side DC-DC stage after transformer or DC-DC isolator. Use Value: MSL-1 packaging supports reflow soldering in medical-grade assembly; thermal protection enhances reliability in confined housings. |
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 electrical specs and pinout; differs only in RoHS-compliance marking and tape-and-reel packaging - no functional difference. | Identical use cases; suitable for legacy designs requiring identical form-fit-function. | Select LM2576T-3.3 when sourcing from distributors with older inventory or specific packaging requirements (e.g., bulk vs. tape). |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller solution size, but lower max current (3 A typ. derated), and no integrated thermal shutdown latch. | Better suited for space-constrained consumer devices; less robust for sustained industrial overloads. | Choose MP1584EN-LF-Z only if PCB area is critical and thermal margin is verified - not a drop-in replacement due to different compensation and layout needs. |
Compared with LM2576T-3.3, the LM2576TV-3.3G offers identical performance with updated Pb-free marking; versus MP1584EN-LF-Z, it trades higher-frequency compactness for proven ruggedness, simpler magnetics, and autonomous fault recovery - making it preferable for industrial and medical applications demanding long-term reliability.
Availability
LM2576TV-3.3G is available at Aetrix Electronics and suitable for industrial PLCs, embedded system main supplies, test equipment auxiliary rails, and medical sensor interface power requiring stable component supply and long-lifecycle support.
Supply support for LM2576TV-3.3G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The LM2576 series was designed specifically for cost-sensitive, high-reliability industrial and embedded applications requiring simple, robust, and thermally resilient non-synchronous buck conversion - prioritizing ease of use and fault tolerance over ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for the LM2576TV-3.3G?
The LM2576TV-3.3G has an absolute maximum input voltage rating of 45 V, but its recommended operating input voltage range is 7.0 V to 40 V. Operation above 40 V risks exceeding safe power dissipation limits, especially at high load currents or elevated ambient temperatures. The device's internal current limit and thermal shutdown provide protection, but sustained operation near 45 V is not advised per the datasheet's operating ratings.
Does the LM2576TV-3.3G require an external feedback resistor network?
No, the LM2576TV-3.3G does not require external feedback resistors. It integrates a precise internal resistor divider optimized for 3.3 V output, referenced to the 1.235 V bandgap. Pin 4 (Feedback) is internally connected and inaccessible - unlike the adjustable LM2576-ADJ version, which requires external R1/R2. This simplifies layout and improves output voltage accuracy and stability.
Can the LM2576TV-3.3G be used in a negative-output (buck-boost) configuration?
Yes, the LM2576TV-3.3G can be configured as a positive-to-negative converter (inverting buck-boost) per Figure 1 in the datasheet. In this topology, the output is referenced to VIN rather than GND, producing a regulated −3.3 V rail. However, the feedback pin remains tied to the negative output, and the ground pin becomes the negative output terminal - requiring careful PCB isolation and layout adherence to the datasheet's inverting application notes.
What is the thermal resistance (junction-to-case) for the LM2576TV-3.3G TO-220 package?
The LM2576TV-3.3G in the TO-220-5 package (Case 314B) has a specified thermal resistance of RJC = 5.0 °C/W. This value assumes proper mechanical mounting of the heatsink surface (Pin 3) to an external heatsink. The junction-to-ambient resistance is 65 °C/W without heatsink, underscoring the importance of thermal management for continuous 3.0 A operation at elevated ambient temperatures.
Is the LM2576TV-3.3G pin-compatible with other LM2576 fixed-output variants?
Yes, all LM2576 fixed-output versions (e.g., LM2576TV-5.0G, LM2576TV-12G) share identical TO-220-5 pinout, electrical architecture, and package dimensions. Only the internal feedback divider differs - meaning PCB layouts designed for LM2576TV-3.3G can accommodate other fixed-output variants without modification, provided input/output capacitor and inductor values are re-verified for the new voltage/current requirements.
LM2576TV-3.3G 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-3.3G FAQ
1.How can I place an order for LM2576TV-3.3G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576TV-3.3G 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-3.3G reliable?
The price and inventory of LM2576TV-3.3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576TV-3.3G is usually 5 days.
3.What payment methods are accepted for LM2576TV-3.3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576TV-3.3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576TV-3.3G?
LM2576TV-3.3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576TV-3.3G 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-3.3G?
For technical support, including LM2576TV-3.3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576TV-3.3G requirements.
6.How does Aetrix verify that LM2576TV-3.3G is sourced from the original manufacturer or authorized distributors?
All LM2576TV-3.3G 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-3.3G meets industry standards.
7.What is the process for return or replacement of LM2576TV-3.3G?
All LM2576TV-3.3G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576TV-3.3G, 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-3.3G part is unused and in its original packaging.
Return procedure for LM2576TV-3.3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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