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Texas Instruments LM2575SX-15
- Part No.:
- LM2575SX-15
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575SX-15.pdf
- Description:
- IC REG BUCK 15V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,312
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Product details
Overview
LM2575SX-15 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, 40V max input voltage, 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 datasheet, LM2575SX-15 pinout, LM2575SX-15 application, or LM2575SX-15 equivalent, this page delivers verified technical context, real-world design meaning for key specs, TO-263 package details, confirmed alternative parts with functional differences, and supply support for volume procurement and BOM continuity.
Technical Context
The LM2575SX-15 implements a fixed-frequency PWM buck topology with internal NPN switch, feedback comparator, oscillator, and protection circuitry. Its 52 kHz switching frequency enables use of standard off-the-shelf inductors and reduces EMI compared to higher-frequency alternatives.
It operates in continuous conduction mode with 98% maximum duty cycle, supports TTL-compatible shutdown (ISTBY = 50 μA typical), and regulates output using internal 1.23V reference with feedback bias current ≤500 nA. Thermal shutdown activates at TJ ≥150°C; current limit trips at peak switch current of 1.7–3.2 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15V ±4% over 18V–40V input and 0.2A–1A load - ensures stable rail for analog front-ends or logic without external resistive divider. |
| Max Input Voltage | 40V - supports 24V industrial bus inputs with margin; not rated for 60V HV-series operation. |
| Switching Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., PE-52627) and simplifies EMI filtering. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, or op-amp rails without external pass devices. |
| Efficiency | 88% at VIN = 18V, IOUT = 1A - reduces thermal load vs. linear regulators; eliminates need for heatsink in many applications. |
| Quiescent Current | 5 mA operating / 50 μA standby - enables low-power modes when ON/OFF pin is pulled high. |
| Thermal Resistance | θJA = 37°C/W (DDPAK/TO-263, 1 in² copper) - allows 1A operation up to +85°C ambient without forced air. |
Pinout & Package
LM2575SX-15 uses the 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring an exposed thermal pad for enhanced heat dissipation. Mounting requires soldering the pad to ≥1 in² PCB copper area to achieve θJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | VIN supply connection | Accepts 4.75–40V DC; requires local 100 μF/75V aluminum electrolytic bypass capacitor. |
| 2 - Output | Switched output node | Drives external catch diode and LC filter; peak current capability up to 3.2A during current limit. |
| 3 - Ground | Power and signal reference | Must be connected to low-impedance ground plane; ties internal circuitry and thermal pad substrate. |
| 4 - Feedback | Regulation sense input | Internally referenced to 1.23V; unused in fixed-output versions - left open or grounded per datasheet. |
| 5 - ON/OFF | TTL-compatible enable control | Logic-low (≤0.8V) enables regulation; logic-high (≥2.2V) disables output and reduces IQ to 50 μA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Automatically disables switching at TJ ≥150°C and recovers after cooldown - prevents permanent damage under overload or poor heatsinking. |
| Cycle-by-cycle current limiting | Clamps peak switch current to 1.7–3.2A range - protects internal transistor and external components during short-circuit or startup surge. |
| Fixed 52 kHz oscillator | Eliminates need for external timing components; provides predictable EMI profile and simplifies filter design. |
| TTL shutdown interface | Enables system-level power sequencing with <50 μA standby current - suitable for battery-backed or energy-conscious designs. |
| Requires only 4 external components | Input cap, output cap, catch diode, and inductor - minimizes BOM count and layout complexity vs. controller-based solutions. |
Applications
| Industrial Power Supply | Embedded Controller Rail |
|---|---|
|
Use Scenario: Generating stable 15V from 24V DC bus in programmable logic controllers (PLCs) with wide ambient temperature variation. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 15V to analog I/O modules and isolated communication interfaces. Use Value: 88% efficiency at 1A reduces board-level heat rise; TO-263 thermal pad enables convection-only cooling in sealed enclosures. |
Use Scenario: Providing clean 15V supply to FPGA configuration circuits and auxiliary ADC references in edge AI gateways. IC Role / Device Role / Timing Role: Local point-of-load regulator with fast transient response for mixed-signal subsystems. Use Value: Fixed 15V output eliminates resistor divider errors; ±4% tolerance ensures compliance with 15V ±0.6V logic interface specs. |
| Test Equipment Power | Motor Drive Auxiliary Supply |
|
Use Scenario: Powering op-amp rails and DAC buffers in portable multimeters and calibration sources where size and efficiency are critical. IC Role / Device Role / Timing Role: Compact, high-efficiency pre-regulator feeding low-noise LDOs for precision analog stages. Use Value: 52 kHz switching enables small 330 μH inductor; 5 mA quiescent current extends battery life in handheld units. |
Use Scenario: Supplying gate driver ICs and MCU cores in 24V brushless motor drives operating in automotive under-hood environments. IC Role / Device Role / Timing Role: Robust auxiliary power source tolerant of load dump transients and thermal cycling. Use Value: 40V absolute max input withstands ISO 7637-2 pulse 1/2a; thermal shutdown prevents latch-up during stall conditions. |
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 (with 4 in² copper); same electrical specs and pinout. | Preferred for prototyping, manual assembly, or legacy through-hole boards; requires heatsink at full 1A in enclosed spaces. | Select LM2575T-15 when mechanical mounting or thermal test requirements favor through-hole construction. |
| LM2575HVS-15 | 60V max input rating; identical TO-263 package and pinout; otherwise electrically identical. | Suitable for 48V telecom or PoE-powered systems where input transients exceed 40V. | Choose LM2575HVS-15 only if input voltage may reach 48–60V; avoid for 24V-only systems due to cost premium. |
Compared with LM2575SX-15, LM2575T-15 trades surface-mount thermal performance for assembly flexibility, while LM2575HVS-15 adds high-voltage headroom without altering footprint or regulation behavior - both require no schematic changes but differ in thermal management and input voltage margin.
Availability
LM2575SX-15 is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller rails, test equipment power, and motor drive auxiliary supplies requiring stable component supply, long-term BOM continuity, and traceable sourcing.
Supply support for LM2575SX-15 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 cost-sensitive, thermally constrained industrial and embedded systems - prioritizing simplicity, reliability, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LM2575SX-15?
The LM2575SX-15 has a maximum input voltage rating of 40V, as specified in its Absolute Maximum Ratings table. This is distinct from the LM2575HVS-15 variant, which supports up to 60V. Exceeding 40V on the LM2575SX-15 may cause permanent damage, even briefly. Designers must ensure transient suppression or input filtering limits VIN to ≤40V under all operating and fault conditions.
Does the LM2575SX-15 require an external feedback resistor network?
No, the LM2575SX-15 does not require an external feedback resistor network. As a fixed-output version, its 15V regulation is implemented internally; the Feedback (pin 4) is unused and should be left open or grounded per TI's recommended layout. External resistors are only needed for the adjustable (ADJ) variants like LM2575SX-ADJ.
What package type is used by the LM2575SX-15, and how does it impact thermal performance?
The LM2575SX-15 uses the 5-lead DDPAK/TO-263 surface-mount package (KTT0005B) with an exposed thermal pad. When soldered to ≥1 in² of PCB copper, its junction-to-ambient thermal resistance (θJA) is 37°C/W - significantly lower than the TO-220 version's 45°C/W - enabling full 1A operation at +85°C ambient without a heatsink.
Can the LM2575SX-15 be synchronized to an external clock?
No, the LM2575SX-15 cannot be synchronized to an external clock. It features a fixed internal 52 kHz oscillator with no synchronization pin or frequency adjustment capability. For designs requiring clock synchronization or EMI reduction via spread-spectrum, consider newer alternatives such as the LM2678 or TPS5430, which offer external sync inputs.
What is the purpose of the ON/OFF pin (pin 5) on the LM2575SX-15?
The ON/OFF pin (pin 5) on the LM2575SX-15 provides TTL-compatible enable/disable control. Pulling it low (≤0.8V) enables regulation; pulling it high (≥2.2V) places the device in low-power standby mode with quiescent current reduced to 50 μA typical. This allows precise system-level power sequencing and battery-saving states without removing input voltage.
LM2575SX-15 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:
- 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):
- 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 FAQ
1.How can I place an order for LM2575SX-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575SX-15 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 reliable?
The price and inventory of LM2575SX-15 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 is usually 5 days.
3.What payment methods are accepted for LM2575SX-15?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575SX-15?
LM2575SX-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575SX-15 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?
For technical support, including LM2575SX-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575SX-15 requirements.
6.How does Aetrix verify that LM2575SX-15 is sourced from the original manufacturer or authorized distributors?
All LM2575SX-15 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 meets industry standards.
7.What is the process for return or replacement of LM2575SX-15?
All LM2575SX-15 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575SX-15, 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 part is unused and in its original packaging.
Return procedure for LM2575SX-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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