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onsemi LM2575TV-3.3G
- Part No.:
- LM2575TV-3.3G
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2575TV-3.3G.pdf
- Description:
- IC REG BUCK 3.3V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
LM2575TV-3.3G from onsemi is a monolithic step-down (buck) switching regulator IC delivering 1.0 A output current at fixed 3.3 V with ±4% output voltage tolerance, 52 kHz internal oscillator frequency, and wide 4.75 V to 40 V input range. It integrates a 1.0 A switch, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - used in embedded power supplies, industrial controllers, and battery-powered systems requiring efficient DC-DC conversion.
For engineers reviewing the LM2575TV-3.3G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A load capability, fixed 3.3 V output without external feedback resistors, TO-220-5 package with heatsink-connected ground pin, and compatibility with standard off-the-shelf inductors (e.g., 330 µH) and Schottky catch diodes.
Technical Context
The LM2575TV-3.3G implements a voltage-mode controlled buck converter architecture with a fixed 52 kHz oscillator, internal 1.235 V bandgap reference, and error amplifier driving a 1.0 A NPN switch. Its ON/OFF pin enables logic-level shutdown with 80 µA standby current, while cycle-by-cycle current limiting and thermal shutdown provide fault protection without external circuitry.
It operates in continuous conduction mode (CCM) across its full input range and supports simple external component count: only input capacitor, output capacitor, inductor, and catch diode are required. The fixed-output version eliminates feedback resistor selection, simplifying layout and reducing BOM count versus adjustable variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over −40°C to +125°C, 4.75–40 V input, 0.2–1.0 A load - ensures stable logic supply for 3.3 V microcontrollers and FPGAs without trimming. |
| Output Current | Guaranteed 1.0 A continuous - sufficient to power multiple digital ICs or small subsystems without derating at 25°C ambient. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0°C to 125°C) - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to MHz-range converters. |
| Efficiency | 75% typical at Vin = 12 V, Iout = 1.0 A - significantly higher than linear regulators, minimizing thermal load and eliminating need for heatsink in many applications. |
| Quiescent Current | 5.0–9.0 mA (25°C), ≤11 mA (−40°C to +125°C) - enables low-power operation during active regulation without excessive idle loss. |
| Standby Current | 80 µA typical when ON/OFF pin ≥2.4 V - supports ultra-low-power sleep modes in battery-backed systems. |
| Saturation Voltage | 1.0–1.3 V at 1.0 A (−40°C to +125°C) - defines minimum dropout and impacts thermal design margin under full load. |
Pinout & Package
LM2575TV-3.3G uses the TO-220-5 (Case 314B) package with heatsink surface electrically connected to Pin 3 (GND). This thermally enhanced package allows direct mounting to a heatsink for high-power operation without isolation hardware.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires low-ESR input capacitor (e.g., 100 µF/50 V) placed adjacent to minimize switching noise. |
| 2 - Output | Emitter of internal NPN switch | Drives inductor; saturation voltage ≤1.3 V at 1.0 A; PCB copper area must be minimized to reduce coupling into sensitive analog circuits. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, inductor, and catch diode; also serves as thermal path to heatsink - must be single-point grounded per layout guidelines. |
| 4 - Feedback | Regulation sense node | Internally tied to 3.3 V output; not user-accessible in fixed versions - eliminates external resistor network and associated temperature drift errors. |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible: <1.2 V = "on", >2.4 V = "off"; draws ≤30 µA when high - enables system-level power sequencing and low-power sleep states. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output | Eliminates external feedback resistors, reducing component count, layout complexity, and long-term drift - ideal for cost-sensitive, high-volume 3.3 V rail generation. |
| Integrated 1.0 A switch | Reduces external transistor and driver requirements; combined with thermal shutdown and current limiting, enables robust single-chip solution without discrete protection components. |
| 52 kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with widely available, low-cost power inductors optimized for this frequency (e.g., Renco RL1952, Pulse PE-52627). |
| TTL shutdown capability | Supports clean, low-power system-level enable/disable using standard logic signals - critical for portable devices and energy-conscious industrial controllers. |
| Thermal and current protection | Self-protecting under overload or short-circuit: automatic shutdown prevents damage and eliminates need for external fuses or current-sense amplifiers. |
Applications
| Industrial PLC I/O Module Power | Embedded Microcontroller Core Supply |
|---|---|
|
Use Scenario: Powering isolated digital I/O channels in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator supplying FPGA configuration logic, level translators, and optocoupler drivers. Use Value: Delivers 1.0 A at 75% efficiency from 24 V input, reducing heat rise in sealed enclosures and enabling compact board layout with minimal external components. |
Use Scenario: Generating stable 3.3 V core voltage for ARM Cortex-M4 microcontrollers in edge sensor nodes. IC Role / Device Role / Timing Role: Main DC-DC converter feeding MCU VDD and peripheral rails; enabled/disabled via ON/OFF pin during deep-sleep cycles. Use Value: 80 µA standby current extends battery life; fixed output eliminates resistor tolerance errors affecting ADC reference stability. |
| Automotive Body Control Unit (BCU) | Point-of-Load Converter for FPGA Mezzanine Cards |
|
Use Scenario: Regulating 3.3 V for CAN transceiver interfaces and EEPROM in automotive body electronics modules. IC Role / Device Role / Timing Role: Secondary regulated supply derived from 12 V vehicle battery; withstands load dump and cold-crank conditions via 40 V max input rating. Use Value: AEC-Q100 qualified NCV2575 variant exists; LM2575TV-3.3G shares identical electrical specs and thermal performance for non-automotive BCU designs. |
Use Scenario: Providing dedicated 3.3 V rail on FPGA carrier boards where space and thermal constraints limit use of multi-rail PMICs. IC Role / Device Role / Timing Role: Standalone point-of-load regulator mounted adjacent to FPGA bank; driven by upstream 12 V or 24 V intermediate bus. Use Value: TO-220-5 package allows direct heatsink attachment; fixed 3.3 V output ensures compliance with FPGA core voltage tolerances without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-3.3 | Same electrical specs and pinout; differs only in packaging - TO-220-5 (Case 314D) with no heatsink tab connection to Pin 3. | Lower thermal performance in high-ambient or high-duty-cycle operation due to higher RJC (5.0°C/W vs. 5.0°C/W but no direct heatsink path); suitable for lower-power or forced-air-cooled designs. | Select LM2575T-3.3 if mechanical mounting constraints prevent heatsink contact with Pin 3, or if thermal load remains below 1.5 W junction-to-ambient. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller external components, but lower 3 A max output current and different pinout; requires external feedback resistors even for 3.3 V. | Enables ultra-compact designs with 2.2 µH inductors and ceramic capacitors, but adds BOM complexity and lacks integrated thermal shutdown latch behavior. | Choose MP1584EN-LF-Z only when board space is severely constrained and design can accommodate re-layout, feedback tuning, and revised thermal analysis. |
Compared with LM2575T-3.3, LM2575TV-3.3G offers superior thermal management via heatsink-connected ground; compared with MP1584EN-LF-Z, it trades higher-frequency miniaturization for simpler implementation, proven reliability, and fixed-output convenience in medium-power industrial applications.
Availability
LM2575TV-3.3G is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and automotive body electronics requiring stable component supply, long-lifecycle support, and consistent thermal performance across temperature extremes.
Supply support for LM2575TV-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 specializing in energy-efficient power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a rugged, easy-to-use monolithic buck regulator family targeting cost-sensitive, medium-power applications where simplicity, reliability, and thermal robustness outweigh ultra-high-frequency miniaturization needs.
FAQ
What is the maximum input voltage rating for LM2575TV-3.3G?
The absolute maximum input voltage for LM2575TV-3.3G is 45 V, but the recommended maximum operating supply voltage is 40 V per the datasheet's Operating Ratings. Exceeding 40 V may trigger internal protection or degrade long-term reliability, even if within absolute limits. Designers should maintain at least 5 V margin below 45 V for transient suppression headroom.
Does LM2575TV-3.3G require an external feedback resistor network?
No - LM2575TV-3.3G is a fixed-output variant with internal feedback divider set for 3.3 V. Pin 4 (Feedback) is internally connected and not accessible externally, eliminating resistor selection, placement, and tolerance-related output drift. This distinguishes it from the LM2575ADJ adjustable version.
Can LM2575TV-3.3G drive a 1.0 A load continuously at 85°C ambient temperature?
Yes - LM2575TV-3.3G guarantees 1.0 A output current across −40°C to +125°C junction temperature. At 85°C ambient, proper heatsinking (using the TO-220-5 package's Pin 3 thermal pad) keeps junction temperature within safe limits. Thermal calculations must account for RJA = 65°C/W and power dissipation ≈1.3 W at full load and 12 V input.
What type of catch diode is recommended for LM2575TV-3.3G?
A Schottky diode such as the 1N5819 (30 V, 1 A) is recommended for LM2575TV-3.3G. Its low forward voltage (<0.5 V) minimizes conduction loss and improves efficiency, while fast recovery avoids reverse-recovery spikes. Diode reverse voltage rating must exceed the maximum input voltage by ≥25%, and current rating should be ≥1.2× the load current.
Is LM2575TV-3.3G RoHS-compliant and lead-free?
Yes - LM2575TV-3.3G is explicitly stated as a Pb-free device in the onsemi datasheet (Rev. 14, March 2025), meeting RoHS Directive 2011/65/EU requirements. It carries MSL Level 1 moisture sensitivity rating, allowing indefinite floor life without dry-packaging or baking prior to assembly.
LM2575TV-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
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- 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
LM2575TV-3.3G FAQ
1.How can I place an order for LM2575TV-3.3G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575TV-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 LM2575TV-3.3G reliable?
The price and inventory of LM2575TV-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 LM2575TV-3.3G is usually 5 days.
3.What payment methods are accepted for LM2575TV-3.3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575TV-3.3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575TV-3.3G?
LM2575TV-3.3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575TV-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 LM2575TV-3.3G?
For technical support, including LM2575TV-3.3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575TV-3.3G requirements.
6.How does Aetrix verify that LM2575TV-3.3G is sourced from the original manufacturer or authorized distributors?
All LM2575TV-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 LM2575TV-3.3G meets industry standards.
7.What is the process for return or replacement of LM2575TV-3.3G?
All LM2575TV-3.3G units undergo pre-shipment inspection (PSI). If there is an issue with LM2575TV-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 LM2575TV-3.3G part is unused and in its original packaging.
Return procedure for LM2575TV-3.3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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