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Texas Instruments LM2575S-3.3/NOPB
- Part No.:
- LM2575S-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575S-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:449
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Product details
Overview
LM2575S-3.3/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 3.3V output, 40V maximum input voltage, 52 kHz internal oscillator, and integrated thermal shutdown and cycle-by-cycle current limiting. It delivers stable power to embedded microcontrollers, industrial sensors, and point-of-load DC/DC conversion stages requiring high efficiency and minimal external components.
For engineers reviewing the LM2575S-3.3/NOPB datasheet, LM2575S-3.3/NOPB pinout, LM2575S-3.3/NOPB application, or LM2575S-3.3/NOPB equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for industrial power supply design and legacy system replacement.
Technical Context
The LM2575S-3.3/NOPB 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 minimizes EMI concerns in space-constrained designs.
It operates in continuous conduction mode across 4.75V–40V input range while maintaining ±4% output voltage accuracy over load (0.2A–1A) and temperature (−40°C to +125°C). Standby current is 50 μA typical when TTL-level shutdown is asserted via the ON/OFF pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over full operating range - ensures compatibility with 3.3V logic rails without external feedback resistors. |
| Max Input Voltage | 40V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Output Current | 1A continuous - sufficient to power ARM Cortex-M microcontrollers, CAN transceivers, and sensor signal chains. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 100–330 μH) and simplifies EMI filtering. |
| Efficiency | 75% at VIN = 12V, IOUT = 1A - reduces thermal load vs. linear regulators, often eliminating need for heatsinks. |
| Shutdown Current | 50 μA typical - enables low-power sleep modes in battery-backed or energy-harvesting applications. |
| Thermal Protection | Internal thermal shutdown with automatic recovery - prevents latch-up during overload or poor PCB thermal design. |
Pinout & Package
LM2575S-3.3/NOPB uses the 5-lead surface-mount DDPAK/TO-263 package (package code KTT0005B), featuring an exposed thermal pad for enhanced heat dissipation. Junction-to-ambient thermal resistance is 37°C/W with ≥1 in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | VIN supply connection | Accepts 4.75V–40V DC; requires local 100 μF aluminum electrolytic bypass capacitor. |
| 2 - Output | Switched output node | Drives external catch diode and output inductor; connects to LC filter network for ripple reduction. |
| 3 - Ground | Power and signal reference | Must be connected to low-impedance ground plane; shares return path with input/output capacitors. |
| 4 - Feedback | Regulation sense input | Internally tied to 3.3V reference; not accessible on fixed-output variants - no external resistor required. |
| 5 - ON/OFF | TTL-compatible enable control | Logic-high (>2.2V) enables regulation; logic-low (<0.8V) disables output and reduces quiescent current to 50 μA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NPN switch | Eliminates need for external MOSFET driver and gate resistor - reduces BOM count and layout complexity. |
| Fixed 52 kHz oscillator | Enables predictable EMI profile and eliminates external timing components - accelerates design validation. |
| Cycle-by-cycle current limit | Protects against short-circuit and overload without external sensing - maintains reliability under fault conditions. |
| Thermal shutdown with auto-recovery | Prevents permanent damage during sustained overtemperature events - avoids system lockup in unventilated enclosures. |
| Only 4 external components required | Input cap, output cap, inductor, and catch diode - enables compact, cost-effective power stage implementation. |
Applications
| Industrial PLC I/O Modules | Embedded Microcontroller Power |
|---|---|
|
Use Scenario: Powering isolated digital I/O channels in programmable logic controllers with 24V DC field bus input. IC Role / Device Role / Timing Role: Primary buck converter generating clean 3.3V rail for FPGA configuration memory, ADC drivers, and optocoupler biasing. Use Value: Delivers 1A at 75% efficiency with no heatsink required - reduces module footprint and thermal management overhead. |
Use Scenario: Supplying core voltage to ARM Cortex-M4 microcontrollers in motor control edge devices. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V intermediate rail to stable 3.3V for MCU VDD and peripheral interfaces. Use Value: Maintains ±4% output accuracy across −40°C to +125°C ambient - ensures reliable boot and real-time operation in harsh environments. |
| Medical Sensor Signal Conditioning | Telecom Line Card Pre-Regulation |
|
Use Scenario: Providing low-noise 3.3V supply to precision analog front-ends in portable patient monitors. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding low-dropout linear regulators that supply ultra-low-noise analog circuits. Use Value: 52 kHz switching frequency allows effective LC filtering to achieve <10 mVpp ripple - meets medical-grade signal integrity requirements. |
Use Scenario: Converting 48V telecom battery backup to 3.3V for digital logic on line interface cards. IC Role / Device Role / Timing Role: High-input-voltage buck stage preceding downstream DC/DC converters and level translators. Use Value: Withstands up to 40V input and includes TTL shutdown - enables graceful power sequencing and brownout response during battery switchover. |
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-3.3 | TO-220 through-hole package; higher θJA (65°C/W) without heatsink; identical electrical specs. | Suitable for prototyping or low-volume board assembly where manual soldering is preferred. | Select LM2575T-3.3 only if through-hole mounting and simplified thermal testing are required. |
| MP1584EN-LF-Z | 3A output, 1.5 MHz switching, adjustable output; requires external feedback resistors and has different pinout. | Better suited for space-constrained, high-efficiency designs needing >1A or variable output voltage. | Choose MP1584EN-LF-Z only when higher current, smaller inductors, or output adjustability are mandatory. |
Compared with LM2575T-3.3, the LM2575S-3.3/NOPB offers superior thermal performance in surface-mount layouts; compared with MP1584EN-LF-Z, it provides drop-in compatibility for legacy LM2575 designs but lacks adjustable output and higher switching frequency benefits.
Availability
LM2575S-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and medical instrumentation requiring stable component supply and long-term manufacturability.
Supply support for LM2575S-3.3/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 ICs, with decades of expertise in switching regulator design and manufacturing.
The LM2575 series was engineered as a high-efficiency, easy-to-use replacement for linear regulators in medium-power DC/DC conversion, targeting cost-sensitive industrial, automotive, and consumer applications where thermal and board-space constraints matter.
FAQ
What is the maximum input voltage rating for LM2575S-3.3/NOPB?
The LM2575S-3.3/NOPB has a maximum input voltage rating of 40V, as specified in the Absolute Maximum Ratings table. This allows direct operation from 24V industrial buses or 36V battery systems without external pre-regulation. Exceeding 40V risks permanent damage, even momentarily - the device does not include overvoltage clamping.
Does LM2575S-3.3/NOPB require external feedback resistors?
No, LM2575S-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its 3.3V regulation is implemented internally using a precision voltage reference and trimmed feedback network. Pin 4 (Feedback) is not user-accessible and must remain unconnected in standard operation.
What package type is used by LM2575S-3.3/NOPB?
LM2575S-3.3/NOPB uses the 5-lead DDPAK/TO-263 surface-mount package (TI package code KTT0005B), featuring an exposed thermal pad on the underside. This package provides significantly lower thermal resistance (θJA = 37°C/W with ≥1 in² copper) than the TO-220 variant, enabling higher power density in compact layouts.
Can LM2575S-3.3/NOPB be used in automotive applications?
LM2575S-3.3/NOPB is rated for −40°C to +125°C junction temperature and supports 40V input, making it suitable for under-hood and infotainment subsystems. However, it is not AEC-Q100 qualified; for safety-critical automotive applications, TI recommends the pin-compatible LM2575QML-SP or automotive-grade alternatives with formal qualification.
What is the typical efficiency of LM2575S-3.3/NOPB at full load?
LM2575S-3.3/NOPB achieves 75% typical efficiency at VIN = 12V and IOUT = 1A, per the Electrical Characteristics table. Efficiency rises to ~88% at higher input voltages (e.g., 25V → 12V conversion), but drops below 70% when stepping down from low input voltages (e.g., 5.5V → 3.3V) due to fixed dropout and switching losses.
LM2575S-3.3/NOPB 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:
- 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):
- 3.3V
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2575S-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575S-3.3/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 LM2575S-3.3/NOPB reliable?
The price and inventory of LM2575S-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575S-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575S-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575S-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575S-3.3/NOPB?
LM2575S-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575S-3.3/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 LM2575S-3.3/NOPB?
For technical support, including LM2575S-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575S-3.3/NOPB requirements.
6.How does Aetrix verify that LM2575S-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575S-3.3/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 LM2575S-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575S-3.3/NOPB?
All LM2575S-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575S-3.3/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 LM2575S-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2575S-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2575S-3.3/NOPB Tags
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