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Texas Instruments LM2575M-3.3/NOPB
- Part No.:
- LM2575M-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575M-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,788
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Product details
Overview
LM2575M-3.3/NOPB from Texas Instruments is a monolithic 1A step-down (buck) switching voltage regulator with fixed 3.3V output, 52 kHz internal oscillator, ±4% output voltage tolerance over line/load/temperature, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring efficient 3.3V rail generation from 4.75–40V inputs.
For engineers reviewing the LM2575M-3.3/NOPB datasheet, LM2575M-3.3/NOPB pinout, LM2575M-3.3/NOPB application, or LM2575M-3.3/NOPB equivalent, key selection factors include its TO-263-5 (DDPAK) package thermal performance (θJA = 37°C/W with 1 in² copper), 1.2A peak switch current limit, 50 μA standby current under TTL shutdown, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575M-3.3/NOPB implements a fixed-frequency pulse-width modulation (PWM) buck topology with internal 52 kHz oscillator and built-in error amplifier, current-sense circuitry, and Darlington output switch. 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 input voltages up to 40V, and delivers regulated 3.3V output at up to 1A continuous load with typical 75% efficiency at 12VIN/1A. Protection features include thermal shutdown, cycle-by-cycle current limiting, and safe operation under short-circuit conditions via frequency foldback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over 4.75–40V input and 0.2–1A load, ensuring reliable logic-level supply for microcontrollers and FPGAs. |
| Max Output Current | 1A continuous DC load capability, sufficient for powering multiple digital ICs or small embedded systems. |
| Switching Frequency | 52 kHz fixed internal oscillator, enabling use of low-cost, high-saturation-current inductors and minimizing EMI filtering complexity. |
| Efficiency | 75% typical at 12VIN/1A/3.3VOUT, reducing heat dissipation versus linear regulators and eliminating need for large heatsinks. |
| Standby Current | 50 μA typical during TTL shutdown (ON/OFF pin high), supporting low-power sleep modes in battery-backed systems. |
| Thermal Resistance | θJA = 37°C/W with 1 in² PCB copper area, enabling 1A operation without external heatsink in compact layouts. |
| Protection Features | Integrated thermal shutdown and cycle-by-cycle current limiting (1.7–3.0A peak), providing robust fault recovery without external circuitry. |
Pinout & Package
LM2575M-3.3/NOPB uses the 5-lead DDPAK/TO-263 surface-mount package (package code KTT0005B), featuring an exposed thermal pad for enhanced heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Voltage supply input | Accepts 4.75–40V DC; requires local 100 μF aluminum electrolytic bypass capacitor. |
| 2 - Ground | Power and signal reference | Common return for input, output, and feedback paths; must connect directly to thermal pad. |
| 3 - Output | Regulated 3.3V switching node | Drives external catch diode and output inductor; high dI/dt node requiring short PCB traces. |
| 4 - Feedback | Output voltage sensing | Internally tied to 3.3V output; not user-accessible in fixed-version devices. |
| 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 |
|---|---|
| Fixed-output architecture | Eliminates external feedback resistors, reducing BOM count and layout sensitivity for 3.3V applications. |
| Internal frequency compensation | Enables stable operation with only four external components: input cap, output cap, inductor, and catch diode. |
| Standard inductor compatibility | Optimized for widely available 330 μH inductors (e.g., Pulse PE-52627), simplifying design and sourcing. |
| TTL shutdown interface | Allows seamless integration with microcontroller GPIOs for power sequencing and system-level energy management. |
| Thermal-enhanced DDPAK package | Exposed thermal pad and low θJA (37°C/W) support 1A operation on standard FR-4 PCBs without heatsinks. |
Applications
| Industrial PLC I/O Module Power | Embedded Microcontroller Core Supply |
|---|---|
Use Scenario: Providing clean, efficient 3.3V power to digital I/O banks and communication interfaces in programmable logic controllers operating from 24V DC rails. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V field power to isolated 3.3V logic supply with ripple <50 mVPP. Use Value: Delivers 1A at 75%+ efficiency, reducing thermal load in sealed enclosures and extending mean time between failures. | Use Scenario: Generating core voltage for ARM Cortex-M or RISC-V microcontrollers in battery-powered edge sensors with duty-cycled operation. IC Role / Device Role / Timing Role: Main power converter enabling low-quiescent 50 μA shutdown mode during sensor sleep cycles. Use Value: Maintains regulation across wide input range (6–36V) while supporting rapid wake-up from deep sleep without external LDO post-regulation. |
| Medical Diagnostic Instrument Auxiliary Rail | Automotive Body Control Module Pre-regulator |
Use Scenario: Supplying 3.3V to ADC front-ends and precision op-amps in portable ultrasound or ECG units powered by Li-ion batteries. IC Role / Device Role / Timing Role: High-PSRR pre-regulator feeding low-noise LDOs, with tight ±4% output tolerance preserving measurement accuracy. Use Value: Stable 3.3V output across battery discharge (3.0–4.2V) when paired with boost stage, ensuring consistent analog performance. | Use Scenario: Generating 3.3V for CAN transceivers and microcontrollers in automotive BCMs operating from 9–16V vehicle battery with load-dump transients. IC Role / Device Role / Timing Role: Robust primary DC/DC stage with thermal shutdown and current limiting surviving 40V load-dump events. Use Value: Withstands 40V absolute max input and provides fault recovery without latch-off, meeting ISO 7637-2 pulse 5a requirements. |
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-220-5 through-hole package; higher θJA (65°C/W); same electrical specs and pinout. | Preferred for prototyping, manual assembly, or legacy through-hole designs requiring no rework. | Select when mechanical mounting constraints favor leaded packages or thermal mass of TO-220 suffices. |
| MP1584EN-LF-Z | 3A rated, 1.5 MHz switching, adjustable output; requires external feedback resistors and compensation. | Suitable for space-constrained designs needing higher current or smaller magnetics, but increases design complexity. | Choose when >1A output or compact size justifies added component count and layout effort. |
Compared with LM2575T-3.3, the LM2575M-3.3/NOPB offers superior thermal performance in surface-mount layouts; compared with MP1584EN-LF-Z, it trades higher current and frequency for plug-and-play simplicity and lower EMI sensitivity in industrial environments.
Availability
LM2575M-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, embedded microcontroller systems, medical diagnostic instruments, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for LM2575M-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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM2575 series was designed as a drop-in replacement for linear regulators in medium-power DC/DC conversion, emphasizing ease of use, thermal robustness, and compatibility with standard passive components.
FAQ
What is the maximum input voltage rating for the LM2575M-3.3/NOPB?
The LM2575M-3.3/NOPB has an absolute maximum input voltage of 45V, with recommended operating input range of 4.75V to 40V. Exceeding 40V risks violating the specified output voltage tolerance and may trigger internal protection circuits. For applications requiring >40V input, the LM2575HV-3.3 variant (60V max operating input) should be used instead of the LM2575M-3.3/NOPB.
Does the LM2575M-3.3/NOPB require external compensation components?
No, the LM2575M-3.3/NOPB integrates full frequency compensation and does not require external compensation components. Its fixed-frequency PWM architecture and internal error amplifier are optimized for stability with only four external parts: input capacitor, output capacitor, power inductor, and catch diode. This eliminates tuning effort and makes the LM2575M-3.3/NOPB significantly simpler to implement than adjustable or current-mode controllers.
What is the thermal performance of the LM2575M-3.3/NOPB in its DDPAK package?
The LM2575M-3.3/NOPB in the DDPAK/TO-263 package achieves θJA = 37°C/W when mounted on a PCB with 1 square inch of copper area thermally connected to the exposed pad. This allows full 1A output current at ambient temperatures up to +85°C without an external heatsink. Performance degrades to θJA = 50°C/W with only 0.5 in² copper, requiring derating above 70°C ambient.
Can the LM2575M-3.3/NOPB be used in battery-powered applications with low standby power requirements?
Yes, the LM2575M-3.3/NOPB supports ultra-low-power operation via its TTL-compatible ON/OFF pin: asserting logic-low disables regulation and reduces quiescent current to 50 μA typical. This enables extended battery life in intermittently active systems such as wireless sensors or portable test equipment, where the LM2575M-3.3/NOPB remains powered but inactive between measurement cycles.
Is the LM2575M-3.3/NOPB pin-compatible with other members of the LM2575 family?
Yes, the LM2575M-3.3/NOPB shares identical pinout and footprint with all LM2575xx variants in the DDPAK/TO-263 package (e.g., LM2575M-5.0/NOPB, LM2575M-ADJ/NOPB), enabling single PCB design reuse across multiple output voltages. However, fixed-output and adjustable versions differ internally-feedback pin (pin 4) is internally connected to output in fixed versions like the LM2575M-3.3/NOPB and must not be externally loaded.
LM2575M-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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):
- 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:
- 24-SOIC
LM2575M-3.3/NOPB FAQ
1.How can I place an order for LM2575M-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575M-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 LM2575M-3.3/NOPB reliable?
The price and inventory of LM2575M-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 LM2575M-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2575M-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575M-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575M-3.3/NOPB?
LM2575M-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575M-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 LM2575M-3.3/NOPB?
For technical support, including LM2575M-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575M-3.3/NOPB requirements.
6.How does Aetrix verify that LM2575M-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2575M-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 LM2575M-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2575M-3.3/NOPB?
All LM2575M-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2575M-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 LM2575M-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2575M-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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