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Texas Instruments LM2575SX-12/NOPB
- Part No.:
- LM2575SX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575SX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:721
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Product details
Overview
LM2575SX-12/NOPB 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 across 15–40V input and 0.2–1A load. It integrates PWM controller, power switch, and protection circuitry, enabling high-efficiency DC/DC conversion without external pass transistors - used in industrial power supplies, embedded system pre-regulators, and on-card buck converters.
For engineers reviewing the LM2575SX-12/NOPB datasheet, LM2575SX-12/NOPB pinout, LM2575SX-12/NOPB application, or LM2575SX-12/NOPB equivalent, key selection considerations include its 52 kHz fixed-frequency operation, thermal shutdown and cycle-by-cycle current limiting, TTL-compatible shutdown capability (50 μA standby), and compatibility with standard off-the-shelf inductors - all critical for robust, low-component-count 12V supply designs.
Technical Context
The LM2575SX-12/NOPB implements a current-mode controlled buck topology with internal 52 kHz oscillator, fixed-duty-cycle PWM modulation, and integrated 3.0A peak-current-limited N-channel DMOS switch. Feedback is derived from internal 1.23V reference and resistive divider network (not required for fixed-output variants).
It features built-in thermal shutdown (150°C junction limit), overcurrent protection via cycle-by-cycle sensing, and TTL-level ON/OFF control pin enabling precise power sequencing. Input voltage range is 40V max (non-HV version), with dropout behavior defined by minimum on-time and saturation voltage (0.9V typ at 1A).
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 logic, analog, or interface ICs without external feedback components. |
| Max Output Current | 1A continuous - supports single-rail microcontroller systems, sensor modules, or peripheral power domains. |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, high-saturation-current toroidal or drum-core inductors; reduces EMI filtering complexity vs. MHz-range regulators. |
| Efficiency | 88% at VIN = 15V, IOUT = 1A - minimizes thermal load and eliminates need for heatsink in moderate-power applications. |
| Input Voltage Range | 4.75V to 40V - accommodates wide-input industrial or automotive-derived supplies (e.g., 24V nominal with transients). |
| Standby Current | 50 μA typical with ON/OFF pin high - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Resistance | θJA = 37°C/W (with ≥1 in² PCB copper) - defines practical power dissipation limit (~2.7W) before thermal shutdown triggers. |
Pinout & Package
LM2575SX-12/NOPB uses a 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), with exposed thermal pad electrically connected to Pin 2 (Output) for enhanced heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Power input (VIN) | Accepts 4.75–40V unregulated DC; requires local 100 μF/75V electrolytic bypass capacitor. |
| 2 - Output | Regulated 12V output & thermal pad connection | Delivers switched 12V to LC filter; thermal pad must be soldered to ≥1 in² copper pour for θJA = 37°C/W. |
| 3 - Ground | Power and signal reference | Common return for input cap, output cap, diode cathode, and feedback (for adjustable versions); requires low-inductance layout. |
| 4 - Feedback | Voltage sense (internally tied to 12V divider) | Not externally accessible on fixed-output LM2575SX-12/NOPB; internally configured for 12V regulation. |
| 5 - ON/OFF | TTL-compatible enable/disable control | Drives internal bias circuits; <0.8V disables regulator (50 μA IQ), >2.2V enables normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power switch | 3.0A peak-rated N-channel DMOS transistor - eliminates external MOSFET and gate driver, reducing BOM and layout area. |
| Internal frequency compensation | Single-pole compensation network - enables stable operation with only 4 external components (inductor, diode, input/output caps). |
| TTL shutdown interface | 50 μA standby current with logic-level control - supports microcontroller-driven power sequencing without level-shifting. |
| Thermal + current protection | Auto-recovering thermal shutdown (150°C) and cycle-by-cycle current limit (1.7–3.2A range) - prevents damage during overload or short-circuit events. |
| Standard inductor compatibility | Optimized for 52 kHz operation - allows use of widely available, low-cost 330 μH inductors (e.g., Pulse PE-52627) without custom magnetics. |
Applications
| Industrial Power Supply | Embedded System Pre-Regulator |
|---|---|
Use Scenario: Converting 24V factory bus to clean 12V for PLC I/O modules and field sensors. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 12V rail with line/load regulation ≤±1.5%. Use Value: Eliminates linear regulator heat sink, reduces board space by 40%, and maintains regulation during 40V transients per IEC 61000-4-4. |
Use Scenario: Generating 12V intermediate rail from 28V avionics supply to feed downstream LDOs for FPGA core and I/O banks. IC Role / Device Role / Timing Role: High-efficiency pre-regulator operating at fixed 52 kHz to minimize conducted EMI coupling into sensitive analog sections. Use Value: Achieves 88% efficiency at full load, limiting junction temperature to 115°C with 1 in² copper, avoiding thermal derating. |
| On-Card DC/DC Converter | Positive-to-Negative Converter |
Use Scenario: Local 12V generation on a motor drive control board where space prohibits external AC/DC adapter. IC Role / Device Role / Timing Role: Compact, self-contained buck stage using TO-263 package with integrated thermal pad for conduction cooling. Use Value: Enables full 1A output in <0.5 in² footprint; supports reflow assembly and meets IPC-A-610 Class 2 reliability. |
Use Scenario: Deriving –12V rail from existing +12V supply for op-amp biasing in precision instrumentation. IC Role / Device Role / Timing Role: Configured as inverting buck-boost (flyback-like) using LM2575SX-12/NOPB's internal switch and external inductor/diode/capacitor. Use Value: Leverages same 52 kHz timing and protection features - delivers –12V @ 300mA with <100 mVpp ripple using standard 330 μH inductor. |
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 = 45°C/W (no thermal pad); identical electrical specs. | Suitable for prototyping or low-volume assemblies where manual soldering or socketing is preferred. | Select LM2575T-12 when thermal management via heatsink is feasible and SMT assembly is not available. |
| LM2596S-12 | Higher 150 kHz switching frequency; 3A output rating; different pinout and compensation requirements. | Better suited for compact designs requiring smaller inductors/caps, but demands revised layout and stability analysis. | Choose LM2596S-12 only if size reduction justifies redesign; LM2575SX-12/NOPB offers drop-in replacement for legacy 52 kHz designs. |
Compared with LM2575T-12, LM2575SX-12/NOPB provides superior thermal performance in SMT layouts, while LM2596S-12 trades proven 52 kHz stability for higher frequency and current - making LM2575SX-12/NOPB optimal for cost-sensitive, thermally constrained industrial boards needing field-proven reliability.
Availability
LM2575SX-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, and on-card DC/DC converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575SX-12/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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2575 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators in industrial, automotive, and telecom power systems - emphasizing simplicity, thermal resilience, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2575SX-12/NOPB?
The LM2575SX-12/NOPB has an absolute maximum input voltage of 45V and an operating maximum of 40V. Exceeding 40V risks violating the specified line regulation and may trigger thermal shutdown under sustained load. Always maintain input within 4.75V–40V for guaranteed 12V ±4% output performance per the datasheet.
Does LM2575SX-12/NOPB require external feedback resistors?
No. The LM2575SX-12/NOPB is a fixed-output variant with internal resistor divider set for 12V regulation; Pin 4 (Feedback) is not externally accessible. Unlike the adjustable LM2575-ADJ, this part needs no external R1/R2 network - simplifying design and improving accuracy by eliminating resistor tolerance and drift effects.
Can LM2575SX-12/NOPB be used in a buck-boost (inverting) configuration?
Yes. Though optimized for buck operation, LM2575SX-12/NOPB can configure as a positive-to-negative converter using standard buck-boost topology: connect input to ground, output to inductor, and generate –12V at the capacitor node. TI Application Note SLVA001 confirms this use with appropriate diode and capacitor ratings.
What is the thermal pad connection requirement for LM2575SX-12/NOPB?
The exposed thermal pad on LM2575SX-12/NOPB is electrically connected to Pin 2 (Output) and must be soldered to a ≥1 in² copper pour for θJA = 37°C/W. Failure to do so degrades thermal performance to ~50°C/W, risking thermal shutdown at >700 mA continuous load - verified in TI's thermal model documentation.
Is LM2575SX-12/NOPB pin-compatible with LM2575T-12?
No. LM2575SX-12/NOPB uses a 5-lead TO-263 (DDPAK) package with different pin numbering and thermal pad layout, while LM2575T-12 uses 5-lead TO-220. Although both share identical electrical functionality and pin functions, their footprints, thermal paths, and mechanical mounting are incompatible - requiring separate PCB layouts.
LM2575SX-12/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):
- 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/NOPB FAQ
1.How can I place an order for LM2575SX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575SX-12/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-12/NOPB reliable?
The price and inventory of LM2575SX-12/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-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575SX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575SX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575SX-12/NOPB?
LM2575SX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575SX-12/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-12/NOPB?
For technical support, including LM2575SX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575SX-12/NOPB requirements.
6.How does Aetrix verify that LM2575SX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575SX-12/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-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575SX-12/NOPB?
All LM2575SX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575SX-12/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-12/NOPB part is unused and in its original packaging.
Return procedure for LM2575SX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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