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Texas Instruments LM2575S-5.0/NOPB
- Part No.:
- LM2575S-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575S-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,605
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Product details
Overview
LM2575S-5.0/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-263 (DDPAK) package, delivering a fixed 5.0V output with ±4% tolerance over 8V–40V input and 0.2–1A load. It integrates oscillator, PWM controller, and 65V N-channel MOSFET switch, enabling high-efficiency DC/DC conversion for industrial power rails and embedded system pre-regulation.
For engineers reviewing the LM2575S-5.0/NOPB datasheet, LM2575S-5.0/NOPB pinout, LM2575S-5.0/NOPB application, or LM2575S-5.0/NOPB equivalent, key selection criteria include its 52 kHz fixed-frequency operation, thermal shutdown protection, TTL-compatible shutdown pin, 77% typical efficiency at 12VIN/1A, and compatibility with standard off-the-shelf inductors - all critical for cost-sensitive, thermally constrained buck converter designs.
Technical Context
The LM2575S-5.0/NOPB implements a current-mode control architecture with internal frequency compensation and cycle-by-cycle current limiting. Its 52 kHz oscillator sets the switching period, while the feedback loop regulates output by comparing the internal 1.23V reference against the output via an integrated error amplifier.
Thermal shutdown activates at 150°C junction temperature, and the ON/OFF pin supports TTL-level standby mode with 50 μA quiescent current. The device operates across −40°C to +125°C junction range and requires only four external components: input capacitor, output capacitor, catch diode, and power inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over full line/load/temperature range - ensures stable logic supply without external resistor network. |
| Max Input Voltage | 40V - supports wide-input industrial and automotive battery-derived supplies without external pre-regulation. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and peripheral ICs in compact systems. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Efficiency | 77% typical at 12VIN, 5VOUT, 1A - minimizes thermal load vs. linear regulators, often eliminating need for heatsink. |
| Quiescent Current | 5 mA operating / 50 μA standby - enables low-power sleep modes in battery-backed or energy-conscious applications. |
| Thermal Resistance | θJA = 37°C/W (with ≥1 in² PCB copper) - defines achievable power dissipation limit under natural convection cooling. |
Pinout & Package
LM2575S-5.0/NOPB uses a 5-lead surface-mount DDPAK/TO-263 package (package code KTT0005B), with exposed thermal pad soldered to PCB ground plane for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Input | Voltage supply input | Accepts 8–40V unregulated DC; requires local 47–100 μF aluminum electrolytic bypass capacitor. |
| 2: Output | Regulated 5.0V switching node | Drives external catch diode and output LC filter; peak current capability up to 2.2A. |
| 3: Ground | Power and signal reference | Must be connected to low-impedance PCB ground plane; ties to exposed thermal pad. |
| 4: Feedback | Output voltage sensing | Internally tied to 5.0V output; not accessible - fixed-voltage version omits external resistor divider. |
| 5: ON/OFF | Enable/disable control | TTL-compatible: <1.0V disables (50 μA standby), >2.2V enables; open-circuit defaults to ON. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 65V N-channel power switch | Eliminates external MOSFET and gate driver, reducing BOM count and layout area. |
| Internal thermal shutdown | Automatically disables output above 150°C junction temperature, preventing permanent damage during overload or poor heatsinking. |
| Cycle-by-cycle current limiting | Clamps peak switch current at 1.7–3.2A, protecting against short-circuit and inductor saturation faults. |
| Fixed 52 kHz oscillator | Enables predictable EMI spectrum placement and simplifies filter design versus variable-frequency controllers. |
| Requires only 4 external components | Reduces design time and validation effort: input cap, output cap, Schottky catch diode, and power inductor. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
Use Scenario: Converting 24V DC industrial bus to clean 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 5V rail with ripple <100 mVpp. Use Value: Replaces linear regulators to eliminate 15W+ heat sink requirements while maintaining ±4% output accuracy across temperature. | Use Scenario: Generating 5V from 12V vehicle battery for infotainment MCU and CAN transceiver. IC Role / Device Role / Timing Role: High-efficiency intermediate-stage regulator preceding low-noise LDOs. Use Value: Delivers 1A at 77% efficiency, reducing thermal stress on PCB and extending battery runtime in always-on subsystems. |
| On-Card DC/DC Conversion | Positive-to-Negative Converter |
Use Scenario: Local 5V generation on dense digital boards where space prohibits external AC/DC modules. IC Role / Device Role / Timing Role: Compact, self-contained buck converter with minimal external footprint. Use Value: Achieves full 1A output using only 330 μH inductor and standard 330 μF output capacitor - no custom magnetics required. | Use Scenario: Generating −5V rail from +5V source for op-amp biasing or analog front-end circuits. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using same external components. Use Value: Leverages identical IC and inductor to produce negative output without adding dedicated inverting IC or transformer. |
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 | Identical electrical specs but in through-hole TO-220 package (θJA = 65°C/W); no exposed thermal pad. | Suitable for prototyping or low-volume assemblies where manual soldering or socketing is preferred. | Select LM2575T-5.0 when board assembly process does not support SMT or thermal pad reflow. |
| LM2596S-5.0 | Higher 3A output rating, 150 kHz switching frequency, and improved 0.5V dropout; requires different inductor/capacitor values. | Better suited for higher-current or smaller-filter designs; not drop-in compatible due to differing pinout and layout. | Choose LM2596S-5.0 only when upgrading current capability or reducing output ripple below 50 mVpp is required. |
Compared with LM2575T-5.0, LM2575S-5.0/NOPB offers superior thermal performance via its TO-263 thermal pad, while LM2596S-5.0 provides higher current and frequency at the cost of redesigning passive component selection and PCB layout.
Availability
LM2575S-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, on-card DC/DC conversion, and positive-to-negative converter designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575S-5.0/NOPB 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 robust, easy-to-use replacement for three-terminal linear regulators - targeting cost-sensitive, thermally constrained applications in industrial, automotive, and consumer electronics where efficiency and simplicity are paramount.
FAQ
What is the maximum input voltage rating for LM2575S-5.0/NOPB?
The LM2575S-5.0/NOPB has a maximum input voltage rating of 40V, as specified in the Absolute Maximum Ratings table. This allows direct operation from common 24V industrial buses or 36V nominal battery systems with appropriate derating. Exceeding 40V risks permanent damage to the internal power switch, even briefly.
Does LM2575S-5.0/NOPB require an external feedback resistor network?
No, LM2575S-5.0/NOPB does not require an external feedback resistor network. As a fixed-output variant, its 5.0V regulation is implemented internally - pin 4 (Feedback) is permanently connected to the output inside the IC. External resistors are only needed for the adjustable (ADJ) version.
What type of catch diode is recommended for LM2575S-5.0/NOPB?
A Schottky diode rated for ≥1.2× the maximum load current and ≥1.25× the maximum input voltage is recommended for LM2575S-5.0/NOPB. Common choices include the SR103 (30V, 1A) or MBR130 (30V, 1.3A). Fast-recovery diodes like UF4004 may also be used, but Schottky types minimize forward voltage drop and improve efficiency.
Can LM2575S-5.0/NOPB be used in a buck-boost (inverting) configuration?
Yes, LM2575S-5.0/NOPB can be configured as a positive-to-negative buck-boost converter by rearranging external components per TI Application Note SLVA017. In this topology, it generates a regulated −5V output from a +5V input, leveraging the same inductor and diode - though output capacitance and layout must accommodate inverted polarity.
What is the thermal resistance (θJA) of LM2575S-5.0/NOPB under standard PCB conditions?
The LM2575S-5.0/NOPB has a junction-to-ambient thermal resistance (θJA) of 37°C/W when mounted on a PCB with ≥1 square inch of copper area thermally connected to its exposed thermal pad. With less copper (e.g., 0.5 in²), θJA rises to 50°C/W - directly impacting maximum sustainable output current at elevated ambient temperatures.
LM2575S-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2575S-5.0/NOPB FAQ
1.How can I place an order for LM2575S-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575S-5.0/NOPB 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 LM2575S-5.0/NOPB reliable?
The price and inventory of LM2575S-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575S-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575S-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575S-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575S-5.0/NOPB?
LM2575S-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575S-5.0/NOPB 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 LM2575S-5.0/NOPB?
For technical support, including LM2575S-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575S-5.0/NOPB requirements.
6.How does Aetrix verify that LM2575S-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575S-5.0/NOPB 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 LM2575S-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575S-5.0/NOPB?
All LM2575S-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575S-5.0/NOPB, 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 LM2575S-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2575S-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575S-5.0/NOPB Tags
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