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onsemi LM2575TV-3.3
- Part No.:
- LM2575TV-3.3
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2575TV-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,541
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Product details
Overview
LM2575TV-3.3 from onsemi is a monolithic step-down (buck) switching regulator IC delivering 3.3 V fixed output at up to 1.0 A, with ±4% output voltage tolerance over line and load, 4.75 V to 40 V input range, and 52 kHz fixed-frequency internal oscillator. 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, battery chargers, and industrial DC-DC conversion.
For engineers reviewing the LM2575TV-3.3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.0 A output current, no external compensation required, minimal external component count (only 4), and compatibility with standard off-the-shelf inductors optimized for 52 kHz operation.
Technical Context
The LM2575TV-3.3 implements a voltage-mode controlled buck converter architecture with an internal 1.0 A NPN switch, 1.235 V bandgap reference, and error amplifier driving a PWM comparator. Its 52 kHz oscillator sets switching frequency independent of input/output conditions, enabling predictable EMI filtering and stable loop design using standard LC components.
Protection features are tightly integrated: cycle-by-cycle current limiting triggers at 1.7–3.0 A (depending on temperature), thermal shutdown activates above 150°C junction temperature, and the ON/OFF pin enables logic-level shutdown with 80 µA typical standby current - all without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±4% (3.135–3.465 V over −40°C to +125°C), eliminating need for post-regulation trimming in most 3.3 V logic supply applications. |
| Max Output Current | 1.0 A continuous, enabling direct powering of microcontrollers, FPGAs, and peripheral ICs without external pass devices. |
| Input Voltage Range | 4.75 V to 40 V, supporting wide-input industrial, automotive (cold-crank tolerant), and adapter-fed systems. |
| Switching Frequency | 52 kHz (±10% over 0°C–125°C), enabling use of low-cost, high-saturation-current toroidal or shielded inductors with minimal core loss. |
| Efficiency | 75% at 12 VIN/3.3 VOUT/1.0 A, reducing thermal load vs. linear regulators and often eliminating heatsink requirements. |
| Quiescent Current | 5.0–9.0 mA (25°C), enabling low-power standby modes when paired with external enable control. |
| Standby Current | 80 µA typical (ON/OFF pin = 5 V), allowing ultra-low-power system sleep states without disconnecting input supply. |
Pinout & Package
LM2575TV-3.3 uses the TO-220-5 (Case 314B) package with heatsink surface electrically connected to Pin 3 (GND). The package supports through-hole mounting and direct heatsinking to chassis or PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires local 100 µF low-ESR capacitor to suppress switching transients and sustain peak current. |
| 2 - Output | Emiter of internal NPN switch | Delivers regulated 3.3 V; saturation voltage ≤1.2 V at 1.0 A ensures low conduction loss and simplifies catch diode selection. |
| 3 - GND | Circuit ground reference | Common return for input capacitor, output capacitor, and feedback network; must be single-point grounded near IC for noise immunity. |
| 4 - Feedback | Regulation sense node | Internally tied to 3.3 V output divider; not user-accessible - fixed-output version has internal resistor network, no external resistors needed. |
| 5 - ON/OFF | Logic-level enable/disable control | Drives internal latch: <1.4 V = ON, >2.2 V = OFF; enables system-level power sequencing and low-quiescent sleep modes. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3 V output | Eliminates external feedback resistors, reducing BOM count, layout area, and calibration risk in 3.3 V rail generation. |
| 52 kHz fixed-frequency operation | Enables predictable EMI filter design and compatibility with standardized inductor families (e.g., Renco RL1952, Pulse PE-52627). |
| Integrated protection | Thermal shutdown + cycle-by-cycle current limit provide fault resilience without external sensing or latch circuitry. |
| TTL-compatible ON/OFF pin | Supports direct interfacing with MCU GPIOs or system supervisors for controlled power-up/down sequencing. |
| No external compensation | Internal compensation allows stable operation with only 4 external components: input cap, output cap, inductor, catch diode. |
Applications
| Industrial PLC I/O Module Power | Automotive Infotainment Core Supply |
|---|---|
|
Use Scenario: Providing isolated 3.3 V power to digital I/O banks in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V to 3.3 V at up to 1.0 A, directly powering FPGA configuration memory and level-shifted communication interfaces. Use Value: High efficiency (≈78% at 24 VIN) minimizes heat buildup in sealed enclosures; wide input range accommodates 24 V bus fluctuations during motor startup. |
Use Scenario: Generating 3.3 V core voltage for SoC and display controller in head-unit systems powered from 9–16 V automotive battery. IC Role / Device Role / Timing Role: Main DC-DC converter handling cold-crank (down to 4.75 V) and load-dump (up to 40 V) transients per ISO 7637-2. Use Value: Guaranteed operation across full automotive temperature range (−40°C to +125°C) and robust overvoltage/overcurrent protection reduce need for redundant supervision circuits. |
| Portable Medical Device Battery Charger | Industrial Sensor Node Power Management |
|
Use Scenario: Regulating 3.3 V for microcontroller and BLE radio in rechargeable handheld diagnostic tools using Li-ion batteries (3.0–4.2 V) with boost pre-regulator. IC Role / Device Role / Timing Role: Secondary buck stage after boost converter, delivering clean, low-noise 3.3 V under dynamic load from wireless data transmission bursts. Use Value: 80 µA standby current extends battery life in sleep mode; fixed 3.3 V output ensures consistent ADC reference and RF performance without calibration drift. |
Use Scenario: Powering ultra-low-power sensor nodes (temperature, pressure) deployed in factory automation with 12–24 V fieldbus supply. IC Role / Device Role / Timing Role: Primary power converter enabling intermittent wake-up cycles - active only during sensor sampling and RF transmission. Use Value: Logic-level ON/OFF control synchronizes with MCU sleep/wake signals, achieving sub-100 µA system quiescent current in deep-sleep state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-3.3 | Same electrical specs; TO-220-5 package but Case 314D (no heatsink tab connection to Pin 3), slightly higher RJA (70°C/W vs. 65°C/W). | Less effective thermal coupling to heatsink; suitable where board-level heatsinking is not required or thermal margin is ample. | Select LM2575T-3.3 only if mechanical mounting constraints prohibit Case 314B or if lower cost justifies reduced thermal performance. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller external components, but requires external compensation and lacks integrated thermal shutdown latch. | Better suited for space-constrained designs; less robust in sustained overload due to absence of auto-restart thermal protection. | Choose MP1584EN-LF-Z when PCB area is critical and system-level thermal monitoring is already implemented. |
Compared with LM2575TV-3.3, LM2575T-3.3 offers identical regulation but inferior thermal path, while MP1584EN-LF-Z trades integration and protection for size reduction - making LM2575TV-3.3 optimal for thermally demanding, reliability-critical industrial applications requiring minimal external parts.
Availability
LM2575TV-3.3 is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, portable medical devices, and sensor node power supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2575TV-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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power management, analog, and sensor technologies for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was designed as a drop-in replacement for linear regulators in medium-power DC-DC conversion, emphasizing simplicity, ruggedness, and minimal external component count for cost-sensitive embedded power applications.
FAQ
What is the maximum input voltage rating for LM2575TV-3.3?
The absolute maximum input voltage for LM2575TV-3.3 is 45 V, but its recommended operating range is 4.75 V to 40 V. Operation at 40 V is fully specified across temperature and load, making it suitable for 24 V industrial systems with transient overvoltage margins. Exceeding 45 V risks permanent damage per the Absolute Maximum Ratings table.
Does LM2575TV-3.3 require external feedback resistors?
No, LM2575TV-3.3 does not require external feedback resistors. As a fixed-output variant, it contains an internal resistor divider network that sets the output to 3.3 V. This eliminates tuning components, reduces layout sensitivity, and improves long-term stability versus adjustable versions relying on external precision resistors.
Can LM2575TV-3.3 drive a 1.0 A load continuously at 40 V input?
Yes, LM2575TV-3.3 is rated for 1.0 A continuous output current across its full input range (4.75–40 V) and temperature range (−40°C to +125°C), provided adequate thermal management is implemented. At 40 VIN/3.3 VOUT, efficiency drops (~65–70%), increasing junction temperature - thus proper heatsinking per Case 314B thermal resistance (RJC = 5.0°C/W) is essential.
What type of catch diode is recommended for LM2575TV-3.3?
A Schottky diode such as the 1N5819 (rated 1.0 A, 40 V) is recommended for LM2575TV-3.3. Its low forward voltage (≤0.5 V) minimizes conduction loss and improves efficiency, while fast recovery prevents reverse recovery spikes. For higher reliability, diodes rated ≥1.2× load current (e.g., 1.2 A) and ≥1.25× max input voltage (e.g., 50 V) are advised.
Is LM2575TV-3.3 RoHS compliant and lead-free?
Yes, LM2575TV-3.3 is a Pb-free device per onsemi's product marking and packaging documentation. It meets RoHS Directive 2011/65/EU requirements and carries the "Pb-Free" designation in official datasheets and ordering information - confirmed by onsemi's compliance statements and material declarations.
LM2575TV-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
- 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-3.3 FAQ
1.How can I place an order for LM2575TV-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575TV-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 LM2575TV-3.3 reliable?
The price and inventory of LM2575TV-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 LM2575TV-3.3 is usually 5 days.
3.What payment methods are accepted for LM2575TV-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575TV-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575TV-3.3?
LM2575TV-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575TV-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 LM2575TV-3.3?
For technical support, including LM2575TV-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575TV-3.3 requirements.
6.How does Aetrix verify that LM2575TV-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2575TV-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 LM2575TV-3.3 meets industry standards.
7.What is the process for return or replacement of LM2575TV-3.3?
All LM2575TV-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575TV-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 LM2575TV-3.3 part is unused and in its original packaging.
Return procedure for LM2575TV-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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