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Texas Instruments LM2575S-12
- Part No.:
- LM2575S-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575S-12.pdf
- Description:
- IC REG BUCK 12V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,126
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Product details
Overview
LM2575S-12 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator in TO-263 (DDPAK) package, delivering a fixed 12V output with ±4% tolerance over 15–40V input and 0.2–1A load. It integrates oscillator, PWM controller, and high-current NPN switch, enabling compact DC/DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the LM2575S-12 datasheet, LM2575S-12 pinout, LM2575S-12 application, or LM2575S-12 equivalent, key selection factors include its 52 kHz fixed-frequency operation, thermal shutdown protection, TTL-compatible shutdown pin, 88% efficiency at 15VIN/1A, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575S-12 implements a current-mode controlled buck topology with internal 52 kHz oscillator and cycle-by-cycle current limiting. Its feedback loop references a precise 1.23V internal bandgap, enabling stable regulation without external compensation components.
It operates across −40°C to +125°C junction temperature, supports 15–40V input range, and delivers regulated 12V output with line regulation of ≤0.5% and load regulation of ≤0.5% under full operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% (11.52V–12.48V min/max over temp/load) |
| Max Output Current | 1A continuous - sufficient for powering logic rails, sensors, and analog circuitry |
| Input Voltage Range | 15V to 40V - compatible with 24V industrial bus and automotive battery-derived supplies |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity |
| Efficiency | 88% at VIN = 15V, IOUT = 1A - minimizes thermal stress and eliminates need for heatsink in many applications |
| Thermal Resistance | θJA = 37°C/W (with ≥1 in² PCB copper) - enables high-power density layout without forced air |
| Shutdown Current | 50 μA typical - supports low-power standby modes in battery-backed systems |
Pinout & Package
LM2575S-12 uses a 5-lead surface-mount DDPAK/TO-263 package (package code KTT0005B), with 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 | Unregulated DC input supply | Accepts 15–40V; requires local 100 μF/75V electrolytic bypass capacitor |
| 2: Output | Regulated 12V switching node | Drives external catch diode and LC filter; peak current up to 2.2A |
| 3: Ground | Power and signal reference | Must be connected to low-impedance ground plane; ties to exposed thermal pad |
| 4: Feedback | Voltage sense input (not used in fixed-output version) | Internally tied to 12V divider; no external connection required |
| 5: ON/OFF | TTL-compatible enable control | Logic high (>2.2V) enables regulation; logic low (<0.8V) disables output and reduces IQ to 50 μA |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NPN power switch | Eliminates need for external transistor and drive circuitry; simplifies BOM and layout |
| Internal frequency compensation | Enables stable operation with only 4 external components: input cap, output cap, inductor, and catch diode |
| Thermal shutdown & current limit | Protects against overload, short-circuit, and ambient overheating without external sensing circuitry |
| Standard inductor compatibility | Optimized for widely available 330 μH inductors (e.g., Pulse PE-52627), reducing design lead time |
| −40°C to +125°C operation | Validated for industrial and extended-temperature environments without derating |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
Use Scenario: Converting 24V rail to 12V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and thermally robust 12V supply. Use Value: Delivers 1A at 88% efficiency with no heatsink required, reducing board area and system cost. | Use Scenario: Generating clean 12V intermediate rail for downstream LDOs powering microcontrollers and ADCs. IC Role / Device Role / Timing Role: High-efficiency pre-regulator minimizing power loss before final linear regulation. Use Value: Reduces thermal load on downstream LDOs and extends battery life in portable instrumentation. |
| On-Card DC/DC Conversion | Positive-to-Negative Converter |
Use Scenario: Local 12V generation on dense PCBs where space prohibits external AC/DC adapters. IC Role / Device Role / Timing Role: Self-contained buck regulator enabling distributed power architecture. Use Value: Requires only four passive components and fits within 1.5 cm² footprint including thermal pad. | Use Scenario: Deriving −12V rail from existing +12V supply using buck-boost topology. IC Role / Device Role / Timing Role: Core switching element in inverting configuration with external diode and inductor. Use Value: Leverages same 52 kHz timing and protection features as buck mode, enabling dual-rail designs with one IC family. |
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-12 | TO-220 through-hole package; θJA = 65°C/W (no heatsink); same electrical specs | Suitable for prototyping, low-volume assembly, or legacy through-hole designs | Select when manual assembly, socketing, or vertical mounting is preferred over surface-mount thermal performance |
| LM2596S-12 | Higher 3A output rating; 150 kHz switching; requires different inductor and layout; ±2% output tolerance | Better suited for higher-current or space-constrained designs requiring smaller magnetics | Choose when >1A load or tighter regulation is needed; note non-drop-in replacement due to pinout and compensation differences |
Compared with LM2575T-12, LM2575S-12 offers superior thermal performance via TO-263 package; compared with LM2596S-12, it provides proven reliability and simpler design at lower current, but with relaxed output accuracy and lower switching frequency.
Availability
LM2575S-12 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 and long-term manufacturability.
Supply support for LM2575S-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 technologies.
The LM2575 series was designed as a drop-in, high-efficiency replacement for linear regulators in medium-power DC/DC applications-emphasizing simplicity, thermal robustness, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2575S-12?
The LM2575S-12 has an absolute maximum input voltage of 45V, with recommended operating input range of 15V to 40V. Exceeding 40V may degrade long-term reliability and is not guaranteed per datasheet specifications. For 60V input capability, the LM2575HVS-12 variant must be used instead of the standard LM2575S-12.
Does LM2575S-12 require external compensation components?
No, LM2575S-12 does not require external compensation components. It integrates internal frequency compensation optimized for stable operation with only four external parts: input capacitor, output capacitor, inductor, and catch diode. This eliminates loop stability analysis and reduces design iteration time compared to controller-based solutions.
Can LM2575S-12 be used in a buck-boost (inverting) configuration?
Yes, LM2575S-12 can be configured as a positive-to-negative converter (buck-boost topology) by rearranging external components per TI Application Note SLVA001. In this mode, it generates a regulated −12V output from a +12V input, retaining its 52 kHz switching frequency, current limiting, and thermal protection features.
What is the thermal resistance (θJA) of LM2575S-12 under standard PCB conditions?
The LM2575S-12 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 pad. With less copper (e.g., 0.5 in²), θJA rises to 50°C/W. This value assumes no external heatsink and defines safe continuous 1A operation without exceeding 125°C junction temperature.
Is the feedback pin (Pin 4) accessible or configurable on LM2575S-12?
No, the feedback pin (Pin 4) on LM2575S-12 is internally connected to the 12V output divider and is not externally accessible. It is reserved for the adjustable-version variants (e.g., LM2575S-ADJ). Attempting to modify or connect external circuitry to Pin 4 on LM2575S-12 will disrupt regulation and is not supported.
LM2575S-12 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:
- 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)
LM2575S-12 FAQ
1.How can I place an order for LM2575S-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575S-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 LM2575S-12 reliable?
The price and inventory of LM2575S-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575S-12 is usually 5 days.
3.What payment methods are accepted for LM2575S-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575S-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575S-12?
LM2575S-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575S-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 LM2575S-12?
For technical support, including LM2575S-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575S-12 requirements.
6.How does Aetrix verify that LM2575S-12 is sourced from the original manufacturer or authorized distributors?
All LM2575S-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 LM2575S-12 meets industry standards.
7.What is the process for return or replacement of LM2575S-12?
All LM2575S-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575S-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 LM2575S-12 part is unused and in its original packaging.
Return procedure for LM2575S-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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