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Texas Instruments LM2575N-5.0
- Part No.:
- LM2575N-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2575N-5.0.pdf
- Description:
- IC REG BUCK 5V 1A 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,667
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Product details
Overview
LM2575N-5.0 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in a 5-lead TO-220 package, delivering a fixed 5.0V ±4% output across 8V–40V input, with 77% efficiency at 12VIN/1A, 52 kHz fixed-frequency operation, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the LM2575N-5.0 datasheet, LM2575N-5.0 pinout, LM2575N-5.0 application, or LM2575N-5.0 equivalent, key selection considerations include its 1A continuous output capability, 52 kHz oscillator tolerance (±10%), TO-220 thermal resistance (θJA = 65°C/W, no heatsink), TTL-compatible shutdown pin, and requirement for only four external components - making it suitable for cost-sensitive, medium-power embedded power rails.
Technical Context
The LM2575N-5.0 integrates a PWM controller, power switch, oscillator, error amplifier, and protection circuitry into a single silicon die. Its internal 52 kHz oscillator drives a N-channel MOSFET switch with 0.9V typical saturation voltage at 1A, enabling stable buck regulation without external frequency setting components.
Feedback is internally trimmed to 5.0V for fixed-output variants, eliminating external resistor dividers. The device uses voltage-mode control with internal compensation, requires no loop stability tuning, and enters low-power standby (50 μA typical) when the ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over 0.2–1A load and 8–40V input - ensures stable logic rail supply without trimming. |
| Max Output Current | 1A continuous - supports microcontroller, sensor, and peripheral power without derating at 25°C ambient. |
| Input Voltage Range | 40V max (LM2575 series), 8–40V operational - compatible with 12V/24V industrial bus inputs. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, standard inductors (e.g., 330 µH) and reduces EMI filtering complexity. |
| Efficiency | 77% at 12VIN, 5VOUT, 1A - cuts heat generation by >50% vs. linear regulators, often eliminating heatsinks. |
| Shutdown Current | 50 µA typical - enables low-power system sleep modes without auxiliary LDOs. |
| Thermal Protection | Internal thermal shutdown + cycle-by-cycle current limit (1.7–3.0A peak) - prevents damage during overload or short-circuit. |
Pinout & Package
LM2575N-5.0 is housed in 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 for sustained 1A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Input | Unregulated DC input | Accepts 8–40V; requires ≥47 µF local aluminum electrolytic bypass capacitor. |
| 2: Output | Regulated 5.0V DC output | Switch node and regulated output; connects to inductor, catch diode anode, and output capacitor. |
| 3: Ground | Power and signal reference | Common return for input cap, output cap, feedback network, and ON/OFF control. |
| 4: Feedback | Output voltage sensing | Internally tied to 5.0V reference; left unconnected for fixed-output versions. |
| 5: ON/OFF | TTL-compatible enable control | Pull ≥2.2V to disable (50 µA standby); pull ≤0.8V to enable; open-circuit defaults to ON. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power switch | N-channel MOSFET with 0.9V typical RDS(on) saturation - eliminates external high-side switch and gate driver. |
| Self-contained compensation | Internal frequency compensation - removes need for external compensation network or stability analysis. |
| Standard inductor compatibility | Optimized for off-the-shelf 330 µH inductors (e.g., PE-52627) - reduces BOM count and design cycle time. |
| TTL shutdown interface | Logic-level ON/OFF pin with 12 µA input current - interfaces directly with microcontrollers or logic gates without level shifters. |
| Robust fault protection | Combined thermal shutdown and cycle-by-cycle current limiting - sustains repeated short-circuit events without latch-up or degradation. |
Applications
| Industrial PLC I/O Power | Embedded System Pre-regulator |
|---|---|
|
Use Scenario: Powering isolated digital I/O modules in programmable logic controllers operating from 24V DC field buses. IC Role / Device Role / Timing Role: Primary buck converter generating clean 5V for microcontroller, optocouplers, and level-shifted communication interfaces. Use Value: Delivers 1A at 77% efficiency with no heatsink required, reducing enclosure size and thermal management cost versus linear solutions. |
Use Scenario: Generating intermediate 5V rail from higher-voltage battery or adapter input in portable medical devices. IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-noise LDOs for analog sensor front-ends and ADC references. Use Value: Minimizes battery drain via 50 µA standby current and eliminates thermal runaway risk during intermittent operation. |
| On-Board DC-DC Conversion | Positive-to-Negative Converter |
|
Use Scenario: Local 5V supply on dense PCBs where space prohibits external switching modules. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator using only four passive components and TO-220 footprint. Use Value: Reduces solution size by >60% vs. discrete buck designs while maintaining production-ready reliability. |
Use Scenario: Generating –5V bias for op-amp circuits or RS-232 transceivers from existing +5V or +12V rails. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using same external parts as buck mode. Use Value: Leverages identical BOM and layout for dual-rail systems, cutting qualification effort and inventory SKUs. |
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 | Same electrical specs; TO-220 package with bent, staggered leads (NDH0005D) vs. straight leads (LM2575N-5.0). | Identical functional performance; mechanical lead form differs for through-hole assembly tooling compatibility. | Select LM2575T-5.0 if board stencil or wave solder process requires bent leads; otherwise LM2575N-5.0 is direct substitute. |
| LM2596-5.0 | Higher 3A output, 150 kHz switching, improved line/load regulation (±2%), but requires different inductor (100 µH) and layout. | Supports higher current and tighter regulation; not drop-in due to different frequency, compensation, and thermal profile. | Choose LM2596-5.0 only when >1A load or <±2% regulation is required; LM2575N-5.0 remains optimal for proven 1A designs. |
Compared with LM2575T-5.0, LM2575N-5.0 offers identical regulation and protection but with straight-lead TO-220 mounting; versus LM2596-5.0, it trades higher current capability for simpler magnetics, lower EMI, and legacy design continuity - making it ideal for volume industrial power rails where 1A suffices.
Availability
LM2575N-5.0 is available at Aetrix Electronics and suitable for industrial PLCs, embedded instrumentation, battery-powered medical devices, and on-board DC-DC conversion requiring stable component supply and long-term manufacturability.
Supply support for LM2575N-5.0 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 ICs, with decades of expertise in switching regulator design and manufacturing.
The LM2575N-5.0 belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in cost-sensitive, medium-power applications where minimal external components, robust protection, and proven reliability outweigh ultra-high efficiency or ultra-small footprint.
FAQ
What is the maximum input voltage rating for the LM2575N-5.0?
The LM2575N-5.0 has an absolute maximum input voltage of 45V, with specified operation from 8V to 40V. Exceeding 40V may degrade regulation accuracy or trigger overvoltage stress; for 40–60V input ranges, the LM2575HV-5.0 variant must be used instead. Always observe the 45V absolute maximum to prevent permanent damage to the internal switch.
Does the LM2575N-5.0 require external compensation components?
No, the LM2575N-5.0 includes fully internal frequency compensation and is designed to operate stably with only four external components: input capacitor, output capacitor, inductor, and catch diode. No external RC networks or compensation capacitors are needed - simplifying layout and eliminating tuning steps during prototyping or production.
Can the LM2575N-5.0 be used in a negative-output (inverting) configuration?
Yes, the LM2575N-5.0 can be configured as a positive-to-negative buck-boost converter per TI Application Note SLVA001. In this topology, the output pin becomes the negative rail (e.g., –5V), using the same inductor, diode, and capacitor values as the standard buck circuit. The feedback pin remains unconnected, and grounding is reconfigured accordingly.
What thermal management is required for full 1A operation of the LM2575N-5.0?
At 1A output and 12V input, the LM2575N-5.0 dissipates ~1.5W. With θJA = 65°C/W (no heatsink), junction temperature rise is ~98°C above ambient - exceeding safe limits. A minimum 2-inch² copper pour on the output pin (Pin 2) reduces θJA to ~45°C/W, enabling reliable 1A operation at 50°C ambient. For continuous 1A in enclosed environments, a small heatsink is recommended.
Is the LM2575N-5.0 pin-compatible with other fixed-output versions like LM2575N-12 or LM2575N-ADJ?
Yes, all LM2575N-x variants share identical 5-lead TO-220 pinout and package outline (NDH0005D). However, the feedback pin (Pin 4) is internally connected to the 5.0V reference in LM2575N-5.0, while LM2575N-ADJ leaves it open for external resistor programming. Swapping fixed versions requires no PCB changes; substituting adjustable versions demands external resistor placement.
LM2575N-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- 16-PDIP
LM2575N-5.0 FAQ
1.How can I place an order for LM2575N-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575N-5.0 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 LM2575N-5.0 reliable?
The price and inventory of LM2575N-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575N-5.0 is usually 5 days.
3.What payment methods are accepted for LM2575N-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575N-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575N-5.0?
LM2575N-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575N-5.0 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 LM2575N-5.0?
For technical support, including LM2575N-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575N-5.0 requirements.
6.How does Aetrix verify that LM2575N-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2575N-5.0 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 LM2575N-5.0 meets industry standards.
7.What is the process for return or replacement of LM2575N-5.0?
All LM2575N-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575N-5.0, 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 LM2575N-5.0 part is unused and in its original packaging.
Return procedure for LM2575N-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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