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Texas Instruments LM2575SX-5.0
- Part No.:
- LM2575SX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575SX-5.0.pdf
- Description:
- IC REG BUCK 5V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,995
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Product details
Overview
LM2575SX-5.0 from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 5.0V output, 40V maximum input voltage, 52 kHz internal oscillator, ±4% output voltage tolerance, and integrated thermal shutdown and current limiting. It replaces linear regulators in mid-power DC-DC conversion for industrial power supplies and embedded systems.
For engineers reviewing the LM2575SX-5.0 datasheet, LM2575SX-5.0 pinout, LM2575SX-5.0 application, or LM2575SX-5.0 equivalent, key selection considerations include its TO-263 (DDPAK) package thermal performance (θJA = 37°C/W with 1 in² copper), 1.23V feedback reference, 50 μA standby current under TTL shutdown, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575SX-5.0 implements a fixed-frequency (52 kHz) pulse-width modulation (PWM) buck topology with an internal NPN switch, cycle-by-cycle current limiting, and thermal foldback protection. Its control loop uses internal frequency compensation and requires no external compensation components.
It operates across −40°C to +125°C junction temperature, supports input voltages from 8V to 40V for the standard version, and delivers regulated 5.0V ±4% over 0.2A–1A load current and full line range. The device enters low-power standby mode (<50 μA IQ) when the ON/OFF pin is pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over 0.2A–1A load and 8V–40V input - ensures stable logic supply without external resistive divider. |
| Max Input Voltage | 40V - supports 24V industrial rails and automotive cold-crank transients up to 36V system nominal. |
| Switching Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current toroidal inductors and reduces EMI filtering complexity. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and interface ICs without external pass devices. |
| Efficiency | 77% at VIN = 12V, IOUT = 1A - significantly reduces thermal load vs. linear regulators, often eliminating heatsinks. |
| Standby Current | 50 μA typical - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Resistance | θJA = 37°C/W (with 1 in² PCB copper) - enables 1A operation at ambient ≤75°C without forced air or heatsink. |
Pinout & Package
LM2575SX-5.0 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 | Unregulated DC input supply | Accepts 8–40V; requires local 47–100 μF aluminum electrolytic bypass capacitor. |
| 2 - Ground | Power and signal reference | Must connect directly to thermal pad and low-impedance ground plane to ensure stability and thermal performance. |
| 3 - Output | Regulated 5.0V switching node | Drives external catch diode and output LC filter; high di/dt node requiring short, wide traces. |
| 4 - Feedback | Voltage sense input (not used in fixed-output versions) | Internally connected to 5.0V output; no external connection required - simplifies layout and eliminates feedback trace noise sensitivity. |
| 5 - ON/OFF | Digital enable/disable control | TTL-compatible; <1.0V = ON, >2.2V = OFF; draws ≤30 μA in shutdown - enables system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Activates at ~150°C junction temperature and auto-recovers - prevents permanent damage during overload or poor heatsinking. |
| Cycle-by-cycle current limit | Peaks at 1.7–3.0A (min/max) - protects switch and external diode during short-circuit or startup into heavy capacitive loads. |
| Fixed 52 kHz oscillator | Enables predictable EMI spectrum placement and eliminates need for external timing components or synchronization circuitry. |
| Requires only 4 external components | Input cap, output cap, catch diode, and inductor - reduces BOM count, layout area, and design validation effort. |
| Standard inductor compatibility | Optimized for off-the-shelf 330 μH inductors (e.g., Pulse PE-52627) - accelerates prototyping and avoids custom magnetics. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Converting 24V factory bus to clean 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 1A at 5V with line/load regulation <±1%. Use Value: Eliminates large linear regulator heatsinks, reduces board area by 40%, and maintains regulation during 24V ±15% input variation. |
Use Scenario: Local 5V rail generation on a microcontroller carrier board with space-constrained layout. IC Role / Device Role / Timing Role: Compact, self-contained DC-DC converter replacing discrete switcher designs or inefficient LDOs. Use Value: Achieves 77% efficiency at 1A, enabling operation without airflow while meeting EN55022 Class B conducted EMI limits. |
| Test Equipment Front-End | Legacy System Retrofit |
Use Scenario: Powering analog front-end circuitry (ADCs, op-amps) in portable test meters with 9–36V battery input. IC Role / Device Role / Timing Role: High PSRR, low-noise buck stage preceding LDO post-regulation for sensitive analog rails. Use Value: Delivers 5V ±4% with <100 mVpp ripple using standard 330 μH inductor and Schottky diode - no ferrite beads required. |
Use Scenario: Replacing obsolete 7805 linear regulators in aging industrial controllers to reduce thermal stress and improve reliability. IC Role / Device Role / Timing Role: Drop-in functional upgrade path leveraging existing 5V output routing and minimal component changes. Use Value: Cuts power dissipation by >70% at 500 mA load, extending system lifetime and enabling higher ambient operating temperatures. |
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 | TO-220 through-hole package; θJA = 65°C/W (no heatsink); same electrical specs. | Better suited for prototyping, manual assembly, or legacy through-hole boards. | Select when mechanical mounting flexibility or hand-soldering is prioritized over thermal density. |
| MP1584EN-LF-Z | 3A output, 1.5 MHz switching, adjustable output; requires external feedback resistors and compensation. | Higher power and smaller solution size, but increased design complexity and cost. | Choose when >1A load, tighter size constraints, or programmable output are required - not a drop-in replacement. |
Compared with LM2575T-5.0, the LM2575SX-5.0 offers superior thermal performance in surface-mount layouts; compared with MP1584EN-LF-Z, it trades higher current and frequency for simplicity, proven reliability, and zero-compensation design.
Availability
LM2575SX-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, test equipment front-ends, and legacy system retrofits requiring stable component supply and long-term manufacturability.
Supply support for LM2575SX-5.0 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 reliable, high-volume power IC design.
The LM2575 series was engineered as a robust, easy-to-use replacement for three-terminal linear regulators in medium-power DC-DC conversion, targeting industrial, automotive, and general-purpose embedded applications where efficiency, thermal manageability, and design simplicity are critical.
FAQ
What is the maximum input voltage rating for the LM2575SX-5.0?
The LM2575SX-5.0 has a maximum input voltage rating of 40V, as specified in the Absolute Maximum Ratings table. This allows reliable operation from common 24V industrial buses and accommodates transient overvoltages up to 36V without derating. Exceeding 40V risks permanent damage to the internal NPN switch.
Does the LM2575SX-5.0 require external compensation components?
No, the LM2575SX-5.0 does not require external compensation components. Its control loop incorporates internal frequency compensation optimized for standard 330 μH inductors and typical output capacitor values. This eliminates tuning effort and improves design repeatability across production batches.
Can the LM2575SX-5.0 be used with a 12V input to deliver 5V at 1A?
Yes, the LM2575SX-5.0 is fully specified for 12V input operation at 1A output, delivering 5.0V ±4% with 77% typical efficiency. The device maintains stable regulation across the full 8V–40V input range and 0.2A–1A load range per the Electrical Characteristics table.
What is the purpose of the ON/OFF pin on the LM2575SX-5.0?
Pin 5 (ON/OFF) provides TTL-compatible digital enable/disable control for the LM2575SX-5.0. Driving it below 1.0V (max) enables regulation; pulling it above 2.2V (min) places the device in low-power standby mode with ≤50 μA quiescent current - enabling system-level power sequencing and battery conservation.
Which package type does the LM2575SX-5.0 use, and how does it affect thermal performance?
The LM2575SX-5.0 uses the 5-lead DDPAK/TO-263 surface-mount package (KTT0005B) with an exposed thermal pad. With 1 in² of PCB copper connected to the pad, its junction-to-ambient thermal resistance is 37°C/W - enabling 1A continuous operation at ambient temperatures up to 75°C without a heatsink or forced airflow.
LM2575SX-5.0 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):
- 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)
LM2575SX-5.0 FAQ
1.How can I place an order for LM2575SX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575SX-5.0 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-5.0 reliable?
The price and inventory of LM2575SX-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575SX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2575SX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575SX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575SX-5.0?
LM2575SX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575SX-5.0 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-5.0?
For technical support, including LM2575SX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575SX-5.0 requirements.
6.How does Aetrix verify that LM2575SX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2575SX-5.0 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-5.0 meets industry standards.
7.What is the process for return or replacement of LM2575SX-5.0?
All LM2575SX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2575SX-5.0, 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-5.0 part is unused and in its original packaging.
Return procedure for LM2575SX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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