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Texas Instruments LM2575SX-15/NOPB
- Part No.:
- LM2575SX-15/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575SX-15/NOPB.pdf
- Description:
- IC REG BUCK 15V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:890
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Product details
Overview
LM2575SX-15/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 15V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, and integrated 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 LM2575SX-15/NOPB datasheet, LM2575SX-15/NOPB pinout, LM2575SX-15/NOPB application, or LM2575SX-15/NOPB equivalent, key selection factors include its 40V max input voltage, TO-263 (DDPAK) package thermal performance (θJA = 37°C/W with 1 in² copper), 1.23V feedback reference, and TTL-compatible shutdown capability.
Technical Context
The LM2575SX-15/NOPB implements a fixed-frequency pulse-width modulation (PWM) buck topology with an internal NPN power switch, 52 kHz oscillator, and built-in frequency compensation. Its control loop uses voltage-mode feedback referenced to a precise 1.23V bandgap, enabling stable regulation across 18V–40V input range while delivering up to 1A continuous output current.
Protection features include thermal shutdown triggered at 150°C junction temperature and cycle-by-cycle peak current limiting set at 2.2A typical. The device operates in continuous conduction mode (CCM) under nominal load and transitions to reduced-frequency operation (~18 kHz) during overload or short-circuit conditions to limit average power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15V ±4% over 0.2–1A load and 18–40V input - ensures stable rail for analog front-ends or logic interfaces without external resistive divider. |
| Input Voltage Range | 4.75V to 40V - supports wide-input industrial DC sources including 24V nominal systems with brownout margin. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, standard off-the-shelf inductors (e.g., 330 µH) and reduces EMI filtering complexity vs. MHz-range converters. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, or small FPGAs without external pass devices. |
| Efficiency | 88% at VIN = 18V, IOUT = 1A - minimizes thermal load versus linear regulators, eliminating need for heatsinks in many applications. |
| Feedback Reference | 1.23V ±2.5% - enables accurate output programming in adjustable variants and defines regulation precision in fixed-output versions. |
| Shutdown Current | 50 µA typical - allows low-power standby modes in battery-backed or energy-conscious systems. |
Pinout & Package
LM2575SX-15/NOPB uses the 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring exposed thermal pad for enhanced heat transfer to PCB copper area. Thermal resistance is 37°C/W with ≥1 in² of copper connected to the pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Input | Unregulated DC supply input | Accepts 4.75–40V; requires local 100 µF/75V aluminum electrolytic bypass capacitor. |
| 2: Output | Regulated 15V switching node | Drives external catch diode and LC filter; high dI/dt path requiring short layout to minimize ringing. |
| 3: Ground | Power and signal reference | Must connect directly to thermal pad and low-impedance ground plane; single-point grounding recommended. |
| 4: Feedback | Voltage sense input | Internally compared to 1.23V reference; open for fixed 15V version - no external resistor network required. |
| 5: ON/OFF | TTL-compatible enable control | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables output and reduces quiescent current to 50 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Automatically disables switching at 150°C junction temperature, preventing damage during sustained overload or poor heatsinking. |
| Cycle-by-cycle current limiting | Clamps peak switch current at 2.2A typical, protecting internal NPN transistor and external components during transient faults. |
| Fixed 52 kHz oscillator | Eliminates need for external timing components and provides predictable EMI spectrum for compliance testing. |
| Only 4 external components required | Reduces BOM count and layout area: input cap, output cap, catch diode, and inductor - accelerates design validation. |
| TTL-compatible shutdown | Enables direct interfacing with microcontroller GPIOs or system power sequencers without level-shifting circuitry. |
Applications
| Industrial PLC I/O Module Power | Embedded Controller Pre-Regulator |
|---|---|
Use Scenario: Powers isolated analog input channels and digital I/O drivers in programmable logic controllers operating from 24V DC rails. IC Role / Device Role / Timing Role: Primary buck converter generating clean 15V rail for op-amps, ADC references, and optocoupler drivers. Use Value: Delivers 1A at 88% efficiency, reducing board-level heat generation and enabling compact, fanless enclosure designs. |
Use Scenario: Supplies intermediate 15V rail to feed low-dropout linear regulators powering sensitive MCU cores and peripherals. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down 24V or 36V system voltage before final LDO regulation. Use Value: Lowers thermal stress on downstream LDOs and extends overall system efficiency beyond what standalone linear regulation achieves. |
| On-Card DC-DC Conversion | Positive-to-Negative Inverter |
Use Scenario: Provides dedicated 15V supply for FPGA configuration circuitry and transceiver biasing on dense, space-constrained PCBs. IC Role / Device Role / Timing Role: Local point-of-load regulator minimizing voltage drop and noise coupling from main system rail. Use Value: TO-263 package with 37°C/W θJA enables reliable 1A operation using only PCB copper as heatsink - no discrete heatsink needed. |
Use Scenario: Generates -15V rail from +15V or +24V source for op-amp dual-supply applications in test equipment. IC Role / Device Role / Timing Role: Buck-boost configured via external inductor/diode arrangement to invert polarity while maintaining regulation. Use Value: Leverages same 52 kHz switching frequency and protection features as buck mode, simplifying design reuse across multiple topologies. |
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-15 | TO-220 through-hole package (θJA = 45°C/W unheatsinked); identical electrical specs and pinout. | Suitable for prototyping or low-volume assemblies where manual soldering or socketing is preferred. | Select LM2575T-15 when mechanical mounting flexibility or thermal testing with external heatsinks is required. |
| LM2575HVS-15 | Higher input rating: 60V max (vs. 40V); otherwise identical pinout, package, and regulation performance. | Required for 48V telecom or automotive cold-crank environments where input may exceed 40V transiently. | Choose LM2575HVS-15 only if system-level input transients exceed 40V - adds cost with no benefit in 24V industrial systems. |
Compared with LM2575T-15, the LM2575SX-15/NOPB offers superior thermal performance in surface-mount production; compared with LM2575HVS-15, it trades input voltage headroom for lower cost and identical functionality in standard 24V applications.
Availability
LM2575SX-15/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, embedded controller power supplies, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575SX-15/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 ICs, with decades of expertise in switching regulator design and manufacturing reliability.
The LM2575 series was engineered as a drop-in, high-efficiency replacement for three-terminal linear regulators in industrial and embedded power applications - prioritizing simplicity, thermal robustness, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LM2575SX-15/NOPB?
The LM2575SX-15/NOPB has a maximum input voltage rating of 40V. This is specified under absolute maximum ratings and confirmed in operating conditions. Exceeding 40V risks permanent damage. For applications requiring higher input voltage tolerance, the LM2575HVS-15 variant supports up to 60V input and shares identical pinout and regulation characteristics with the LM2575SX-15/NOPB.
Does the LM2575SX-15/NOPB require external feedback resistors to set its output voltage?
No, the LM2575SX-15/NOPB does not require external feedback resistors. As a fixed-output variant, its 15V regulation is implemented internally - pin 4 (Feedback) is left unconnected in standard operation. External resistors are only necessary for the adjustable version (LM2575SX-ADJ). Using resistors with the LM2575SX-15/NOPB would disrupt regulation and is not supported.
What thermal performance can be expected from the LM2575SX-15/NOPB in a typical PCB layout?
With 1 square inch of copper area thermally connected to the exposed pad, the LM2575SX-15/NOPB achieves a junction-to-ambient thermal resistance (θJA) of 37°C/W. At 1A output and 88% efficiency, power dissipation is ~2W, resulting in ~74°C temperature rise above ambient - well within the 125°C max operating junction temperature. No external heatsink is required under these conditions.
Can the LM2575SX-15/NOPB be used in a buck-boost (inverting) configuration?
Yes, the LM2575SX-15/NOPB can be configured as a positive-to-negative inverter by rearranging the inductor and diode per TI Application Note SLVA017. Its internal switch and control architecture support this topology. However, output voltage regulation accuracy degrades slightly due to diode forward voltage variation, and the achievable negative output magnitude is limited by duty cycle constraints - typically up to −15V from a +24V input.
Is the LM2575SX-15/NOPB pin-compatible with other packages in the LM2575 family?
The LM2575SX-15/NOPB (TO-263) shares identical pin numbering and function with the LM2575T-15 (TO-220) and LM2575HVS-15 (TO-263), making them electrically and functionally interchangeable. However, PCB footprints differ: TO-263 requires surface-mount pads and thermal vias, while TO-220 needs through-hole holes and standoff clearance. Layout redesign is required for package substitution.
LM2575SX-15/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- 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):
- 15V
- 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)
LM2575SX-15/NOPB FAQ
1.How can I place an order for LM2575SX-15/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575SX-15/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 LM2575SX-15/NOPB reliable?
The price and inventory of LM2575SX-15/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575SX-15/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575SX-15/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575SX-15/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575SX-15/NOPB?
LM2575SX-15/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575SX-15/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 LM2575SX-15/NOPB?
For technical support, including LM2575SX-15/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575SX-15/NOPB requirements.
6.How does Aetrix verify that LM2575SX-15/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575SX-15/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 LM2575SX-15/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575SX-15/NOPB?
All LM2575SX-15/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575SX-15/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 LM2575SX-15/NOPB part is unused and in its original packaging.
Return procedure for LM2575SX-15/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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