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Texas Instruments LM2575T-5.0/LF02
- Part No.:
- LM2575T-5.0/LF02
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2575T-5.0/LF02.pdf
- Description:
- IC REG BUCK 5V 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,829
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Product details
Overview
LM2575T-5.0/LF02 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-220 package, delivering fixed 5.0V ±4% output across 8–40V input range, with 52 kHz fixed-frequency operation, thermal shutdown, and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575T-5.0/LF02 datasheet, LM2575T-5.0/LF02 pinout, LM2575T-5.0/LF02 application, or LM2575T-5.0/LF02 equivalent, key selection criteria include input voltage range (8–40V), guaranteed 1A output current, ±4% output tolerance at full load/temperature, TTL-compatible shutdown capability (50 μA standby), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575T-5.0/LF02 integrates a PWM controller, power switch, oscillator, error amplifier, and protection circuitry into a single TO-220 device. Its fixed-frequency 52 kHz operation enables predictable EMI filtering and stable loop compensation using only four external components: input capacitor, output capacitor, catch diode, and inductor.
It employs internal frequency compensation and a built-in 1.23V reference for feedback control. The output stage features a bipolar NPN transistor switch with 0.9V typical saturation voltage at 1A, enabling efficient conversion without external gate drivers or complex layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over 0.2–1A load and −40°C to +125°C junction temperature |
| Input Voltage Range | 8V to 40V - supports 12V/24V industrial rails and battery-backed systems |
| Output Current | 1A continuous - sufficient for microcontroller subsystems, sensors, and logic rails |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, high-saturation-current inductors (e.g., 330 µH) |
| Efficiency | 77% at VIN = 12V, IOUT = 1A - reduces thermal load vs. linear regulators |
| Standby Current | 50 µA typical with TTL shutdown - enables low-power sleep modes |
| Thermal Protection | Internal thermal shutdown with automatic recovery - prevents latch-up during overload |
Pinout & Package
LM2575T-5.0/LF02 uses a 5-lead TO-220 package (Package Number NDH0005D) with exposed tab electrically connected to Pin 2 (Output). Mounting requires thermal interface to heatsink or PCB copper pour for sustained 1A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Unregulated DC supply input | Accepts 8–40V; requires local 100 µF/75V electrolytic bypass |
| 2 - Output | Regulated 5.0V switching node | Drives inductor; connects to exposed tab - must be thermally coupled to heatsink |
| 3 - Ground | Power and signal reference | Single-point ground connection required for noise immunity and stability |
| 4 - Feedback | Output voltage sense input | Internally tied to 5.0V divider; not accessible on fixed-output variants |
| 5 - ON/OFF | TTL-compatible enable/disable control | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables with 50 µA standby |
Key Features
| Feature | Design Value |
|---|---|
| Integrated switch and controller | Eliminates need for external MOSFET driver or discrete PWM IC |
| Fixed 5.0V output | Removes external resistor divider, reducing BOM count and layout sensitivity |
| 52 kHz oscillator | Enables use of low-DCR, high-current inductors with minimal core loss |
| Cycle-by-cycle current limit | Protects against short-circuit and overload without external sensing resistors |
| TTL shutdown | Allows system-level power sequencing and low-quiescent-power sleep states |
Applications
| Industrial PLC I/O Power | Embedded Microcontroller Supply |
|---|---|
|
Use Scenario: Powering digital I/O modules in programmable logic controllers operating from 24V DC rails. IC Role / Device Role / Timing Role: Primary buck converter generating clean, regulated 5V for FPGA configuration, optocoupler drivers, and level-shifting logic. Use Value: Delivers 1A at 77% efficiency with no heat sink required below 50°C ambient, simplifying enclosure design. |
Use Scenario: Providing main VCC to ARM Cortex-M or RISC-V SoC-based edge nodes with intermittent wireless transmission. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-dropout linear regulators for noise-sensitive analog peripherals. Use Value: Enables 50 µA standby mode via TTL shutdown, extending battery life in duty-cycled sensor applications. |
| On-Board 12V-to-5V Conversion | Positive-to-Negative Buck-Boost Converter |
|
Use Scenario: Local 5V rail generation on motor drive boards where 12V is already available for gate drivers and logic. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator minimizing PCB area and component count. Use Value: Requires only four passive components - input cap, output cap, Schottky diode, and 330 µH inductor - accelerating design validation. |
Use Scenario: Generating −5V bias for op-amp circuits or RS-232 transceivers from a positive 12V supply. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using same external parts as buck mode. Use Value: Leverages identical 52 kHz switching and current-limit architecture - no redesign needed beyond diode/inductor reorientation. |
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-5.0 | No /LF02 suffix; standard industrial grade (−40°C to +125°C), same electrical specs and TO-220 package | Identical functional behavior; /LF02 denotes tape-and-reel packaging per TI's ordering convention | Select LM2575T-5.0 for tube delivery or prototyping; LM2575T-5.0/LF02 for automated SMT assembly |
| LM2575HVT-5.0 | Higher input rating: 60V max vs. 40V; otherwise identical pinout, 5V output, and 1A capability | Suitable for 48V telecom or automotive cold-crank environments where transient spikes exceed 40V | Choose LM2575HVT-5.0 only if input can exceed 40V; adds cost and thermal overhead for 12V/24V systems |
Compared with LM2575T-5.0/LF02, the LM2575T-5.0 offers identical performance in tube packaging, while LM2575HVT-5.0 extends input range to 60V at the expense of higher thermal resistance and reduced efficiency below 30V - making LM2575T-5.0/LF02 optimal for cost-sensitive 12V/24V industrial designs.
Availability
LM2575T-5.0/LF02 is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and power management applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2575T-5.0/LF02 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 switching regulator design and manufacturing.
The LM2575 series was engineered as a drop-in replacement for linear regulators in medium-power DC-DC conversion, targeting cost-sensitive industrial, automotive, and consumer applications where efficiency, simplicity, and reliability are critical.
FAQ
What is the maximum input voltage rating for LM2575T-5.0/LF02?
The LM2575T-5.0/LF02 has an absolute maximum input voltage of 45V, but its specified operating input range is 8V to 40V. Operation above 40V risks exceeding electrical limits and invalidating parametric guarantees - for 48V systems, LM2575HVT-5.0 is the qualified alternative. Always observe derating guidelines per TI SNVS106E.
Does LM2575T-5.0/LF02 require an external feedback resistor network?
No. The LM2575T-5.0/LF02 is a fixed-output variant with internal resistor divider set to 5.0V; Pin 4 (Feedback) is not externally accessible and must remain unconnected. This eliminates tuning errors and improves stability versus adjustable versions like LM2575-ADJ.
What thermal management is required for LM2575T-5.0/LF02 at full 1A load?
At 1A and 12V input, LM2575T-5.0/LF02 dissipates ~1.8W. With θJA = 65°C/W (no heatsink), junction rise exceeds safe limits. Use the TO-220 tab (Pin 2) mounted to ≥4 in² copper area or a small aluminum heatsink to maintain TJ ≤125°C. Derate output current above 70°C ambient.
Can LM2575T-5.0/LF02 be used in a negative-output (inverting) configuration?
Yes - LM2575T-5.0/LF02 supports inverting buck-boost topology per TI Application Note SLVA017. With proper diode and inductor orientation, it generates −5V from a +12V input. Output regulation accuracy remains ±4%, but ripple and transient response differ from standard buck mode.
Is LM2575T-5.0/LF02 RoHS compliant and lead-free?
Yes. LM2575T-5.0/LF02 carries the /LF02 suffix per TI's packaging nomenclature, indicating lead-free (Pb-free), RoHS-compliant construction with matte tin lead finish and green molding compound. Full compliance documentation is available in TI's Quality & Environmental page for SNVS106E.
LM2575T-5.0/LF02 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- 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):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- 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
LM2575T-5.0/LF02 FAQ
1.How can I place an order for LM2575T-5.0/LF02 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575T-5.0/LF02 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 LM2575T-5.0/LF02 reliable?
The price and inventory of LM2575T-5.0/LF02 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575T-5.0/LF02 is usually 5 days.
3.What payment methods are accepted for LM2575T-5.0/LF02?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575T-5.0/LF02 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575T-5.0/LF02?
LM2575T-5.0/LF02 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575T-5.0/LF02 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 LM2575T-5.0/LF02?
For technical support, including LM2575T-5.0/LF02 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575T-5.0/LF02 requirements.
6.How does Aetrix verify that LM2575T-5.0/LF02 is sourced from the original manufacturer or authorized distributors?
All LM2575T-5.0/LF02 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 LM2575T-5.0/LF02 meets industry standards.
7.What is the process for return or replacement of LM2575T-5.0/LF02?
All LM2575T-5.0/LF02 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575T-5.0/LF02, 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 LM2575T-5.0/LF02 part is unused and in its original packaging.
Return procedure for LM2575T-5.0/LF02:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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