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Texas Instruments LM2575SX-12
- Part No.:
- LM2575SX-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575SX-12.pdf
- Description:
- IC REG BUCK 12V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,730
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Product details
Overview
LM2575SX-12 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 12V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load, and integrated thermal shutdown/current limiting. It replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion from 15–40V input.
For engineers reviewing the LM2575SX-12 datasheet, LM2575SX-12 pinout, LM2575SX-12 application, or LM2575SX-12 equivalent, this page delivers verified technical context, real-world design constraints (e.g., 4 external components, TO-263 package thermal resistance), and validated alternative options for buck regulator selection.
Technical Context
The LM2575SX-12 implements a fixed-frequency pulse-width modulation (PWM) buck topology with internal 52 kHz oscillator and cycle-by-cycle current limiting. Its feedback loop uses a precision 1.23V reference to regulate output voltage without external compensation.
It operates across −40°C to +125°C junction temperature, supports TTL-compatible shutdown (50 μA standby), and integrates a 1A N-channel DMOS switch with 0.9V saturation voltage at full load-enabling efficient conversion without external MOSFETs or gate drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% over 0.2–1A load and 15–40V input-ensures stable rail for microcontrollers and analog circuitry without trimming. |
| Max Output Current | 1A continuous-supports single-rail power for embedded controllers, sensors, and interface ICs. |
| Input Voltage Range | 15V to 40V-compatible with 24V industrial bus, automotive battery systems (with transient protection), and telecom intermediate rails. |
| Oscillator Frequency | 52 kHz fixed-enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., 330 µH) and reduces EMI filtering complexity. |
| Efficiency | 88% at VIN = 15V, IOUT = 1A-reduces thermal load vs. linear regulators, often eliminating need for heatsinks in PCB-mounted designs. |
| Thermal Resistance | θJA = 37°C/W (DDPAK/TO-263, 1 in² copper)-defines minimum PCB copper area required for safe operation at full load in ambient up to 85°C. |
| Shutdown Current | 50 µA typical-enables low-power sleep modes in battery-backed or energy-conscious systems. |
Pinout & Package
LM2575SX-12 is housed in a 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring an exposed thermal pad for enhanced heat dissipation. The package is RoHS-compliant and designed for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Input | Main DC input supply connection | Accepts 15–40V; requires local 100 µF/75V aluminum electrolytic bypass capacitor to suppress switching transients. |
| 2: Output | Regulated 12V power output | Drives 1A load; connects to output inductor and 330 µF/25V bulk capacitor-ripple <1% of VOUT with proper layout. |
| 3: Ground | Power and signal reference node | Must be tied directly to thermal pad and low-inductance ground plane; critical for stability and EMI control. |
| 4: Feedback | Voltage sense input (not used in fixed-output variants) | Internally connected to 12V divider; left unconnected-no external resistors required for LM2575SX-12 operation. |
| 5: ON/OFF | Digital enable/disable control | TTL-compatible: ≥2.2V = active regulation; ≤0.8V = shutdown (50 µA quiescent); open-circuit defaults to ON. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A DMOS switch | Eliminates external high-side MOSFET and driver, reducing BOM count and layout area by >30% vs. controller-based solutions. |
| Fixed 52 kHz frequency | Enables predictable EMI spectrum and simplifies filter design-no frequency variation with load or temperature. |
| Internal thermal shutdown | Automatically disables output if junction exceeds 150°C, preventing damage during overload or poor heatsinking. |
| Current limit protection | Peak current limit of 2.2A (min) prevents inductor saturation and catastrophic failure under short-circuit conditions. |
| Requires only 4 external components | Inductor, catch diode, input cap, output cap-reduces design time and qualification effort for cost-sensitive industrial applications. |
Applications
| Industrial PLC Power Supply | Embedded Controller Pre-regulator |
|---|---|
Use Scenario: Provides clean 12V rail from noisy 24V factory bus to power PLC I/O modules and communication interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 12V at up to 1A with ±4% accuracy and 88% efficiency. Use Value: Replaces linear regulators to eliminate heatsinks, reduce board space, and maintain regulation despite 24V bus fluctuations and load transients. | Use Scenario: Generates stable 12V intermediate rail for downstream LDOs powering MCU cores, ADCs, and RF transceivers. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down 24V or 36V system voltage before final LDO stage. Use Value: Lowers total power loss and thermal stress on downstream LDOs-critical for thermally constrained embedded enclosures. |
| On-Card DC-DC Converter | Positive-to-Negative Buck-Boost |
Use Scenario: Local 12V generation on motor drive or sensor acquisition cards where centralized power is impractical. IC Role / Device Role / Timing Role: Self-contained buck converter with integrated switch, enabling compact, isolated power islands on dense PCBs. Use Value: Achieves 1A output in TO-263 footprint with minimal external parts-accelerates layout and avoids custom magnetics. | Use Scenario: Generates −12V rail from +12V supply for op-amp biasing or analog signal conditioning circuits. IC Role / Device Role / Timing Role: Configured as inverting buck-boost using standard LM2575SX-12 external component set per TI Application Note. Use Value: Leverages same proven IC and BOM for dual-rail systems-reducing inventory and qualification overhead vs. dedicated inverting ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-12 | TO-220 through-hole package; θJA = 45°C/W (with 4 in² copper); no exposed thermal pad. | Suitable for prototyping, low-volume assembly, or legacy through-hole designs-requires larger PCB area and may need heatsink at full load. | Select LM2575T-12 when manual assembly, socketing, or thermal testing with heatsink is preferred. |
| LM2596SX-12 | Higher 1.5A output rating; 150 kHz switching frequency; improved efficiency (92% at 1A); requires smaller inductor. | Better suited for higher-current or space-constrained applications-but not drop-in due to different pinout, feedback architecture, and layout requirements. | Choose LM2596SX-12 when upgrading performance is acceptable and redesign of inductor, diode, and feedback network is feasible. |
Compared with LM2575T-12, LM2575SX-12 offers superior thermal performance in surface-mount layouts; versus LM2596SX-12, it trades higher current and frequency for proven robustness, simpler external component selection, and direct compatibility with legacy LM2575 designs.
Availability
LM2575SX-12 is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded controller pre-regulators, on-card DC-DC converters, and positive-to-negative buck-boost applications requiring stable component supply and long-term manufacturability.
Supply support for LM2575SX-12 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 LM2575 series was engineered for cost-sensitive, high-reliability industrial and automotive power conversion-emphasizing simplicity, thermal robustness, and minimal external component count.
FAQ
What is the maximum input voltage for LM2575SX-12?
The LM2575SX-12 supports a maximum input voltage of 40V under normal operating conditions. This rating applies across its full temperature range (−40°C to +125°C). Exceeding 40V risks permanent damage, as absolute maximum input is 45V-only for brief transients, not sustained operation. Always include input overvoltage protection when interfacing with unregulated sources like batteries or rectified AC.
Does LM2575SX-12 require external feedback resistors?
No, LM2575SX-12 does not require external feedback resistors. As a fixed-output variant, its 12V regulation is implemented internally via a precision resistor divider tied to the 1.23V reference. Pin 4 (Feedback) is unused and must remain unconnected-adding external resistors would disrupt regulation and potentially damage the IC.
What thermal management is needed for LM2575SX-12 at full 1A load?
At 1A output and 15V input, LM2575SX-12 dissipates ~3W. With θJA = 37°C/W (1 in² copper), junction rise is ~111°C above ambient-requiring ≤40°C ambient for safe 125°C max junction. Use ≥1 in² thermal pad copper, inner-layer planes, and avoid enclosing the device. For >60°C ambient, derate load current or add forced air.
Can LM2575SX-12 be used in a negative-output configuration?
Yes, LM2575SX-12 can generate negative voltages when wired as an inverting buck-boost converter per TI's Application Note SLVA017. In this mode, it produces −12V from a +12V input using the same external components (inductor, diode, caps) as the standard buck circuit-no modification to LM2575SX-12 itself is needed.
What is the purpose of the ON/OFF pin on LM2575SX-12?
The ON/OFF pin (Pin 5) enables digital control of LM2575SX-12 operation. Applying ≤0.8V disables regulation and reduces quiescent current to 50 µA; ≥2.2V enables normal operation. Open-circuit defaults to ON. This allows system-level power sequencing, sleep-mode control, or fault-induced shutdown without external logic.
LM2575SX-12 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):
- 12V
- 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-12 FAQ
1.How can I place an order for LM2575SX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575SX-12 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-12 reliable?
The price and inventory of LM2575SX-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575SX-12 is usually 5 days.
3.What payment methods are accepted for LM2575SX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575SX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575SX-12?
LM2575SX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575SX-12 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-12?
For technical support, including LM2575SX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575SX-12 requirements.
6.How does Aetrix verify that LM2575SX-12 is sourced from the original manufacturer or authorized distributors?
All LM2575SX-12 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-12 meets industry standards.
7.What is the process for return or replacement of LM2575SX-12?
All LM2575SX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575SX-12, 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-12 part is unused and in its original packaging.
Return procedure for LM2575SX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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