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Microchip Technology LM2575-3.3BWM-TR
- Part No.:
- LM2575-3.3BWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575-3.3BWM-TR.pdf
- Description:
- IC REG BUCK 3.3V 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,378
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Product details
Overview
LM2575-3.3BWM-TR from Micrel is a fixed-output 3.3V, 1A step-down (buck) switching regulator in a 24-pin wide SOIC package, featuring 52kHz fixed-frequency operation, ±3% output voltage tolerance over line/load conditions, internal current limiting, thermal shutdown, and <200µA standby quiescent current. It replaces linear regulators in industrial power supplies requiring compact, high-efficiency DC-DC conversion.
For engineers reviewing the LM2575-3.3BWM-TR datasheet, LM2575-3.3BWM-TR pinout, LM2575-3.3BWM-TR application, or LM2575-3.3BWM-TR equivalent, this page delivers verified electrical parameters, package-specific terminal roles, real-world use cases, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The LM2575-3.3BWM-TR integrates a 52kHz oscillator, error amplifier, bandgap reference, and 1A NPN switch driver in a monolithic buck regulator architecture. Its fixed 3.3V output eliminates external feedback resistors, simplifying design while maintaining ±3% regulation across 4V–40V input and 0.2A–1A load ranges.
Protection features include cycle-by-cycle current limiting (1.3–3.2A peak), thermal shutdown at 150°C junction temperature, and ON/OFF control with logic-compatible input (VIH ≥ 1.4V, VIL ≤ 1.2V). The device operates from –40°C to +125°C junction temperature with 100°C/W θJA thermal resistance in its WM package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.168V–3.465V) over full operating range - ensures stable logic supply without external resistor network. |
| Max Output Current | 1A continuous - supports microcontroller, FPGA I/O, or sensor subsystems without external current boosting. |
| Input Voltage Range | 4V to 40V - accommodates 5V, 12V, 24V, and 36V industrial bus rails with margin for transients. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, standard 330µH inductors and reduces EMI filtering complexity. |
| Efficiency | 75% at VIN=12V, IOUT=1A - cuts heat generation vs. linear regulators, eliminating need for heatsink in many applications. |
| Standby Current | <200µA when ON/OFF pin = 5V - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Shutdown | Activates at TJ ≥ 150°C - protects against sustained overload or poor PCB thermal design without external circuitry. |
Pinout & Package
LM2575-3.3BWM-TR uses a 24-pin wide SOIC (WM) package with exposed thermal pad (not electrically connected), 100°C/W junction-to-ambient thermal resistance, and surface-mount footprint optimized for thermal dissipation on 1 in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16, 17, 22 | VIN | Main input supply connection (4V–40V); multiple pins reduce trace resistance and improve current handling. |
| 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 18, 19, 20, 21, 23, 24 | GND | Power and signal ground return paths; distributed pins minimize ground bounce and improve noise immunity. |
| 2 | OUT | Switched output node driving external inductor/diode; connects directly to LC filter output capacitor. |
| 22 | ON/OFF | Logic-level enable/disable input (VIH ≥ 1.4V, VIL ≤ 1.2V); pulls internal switch off when high, enabling ultra-low IQ mode. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±3% accuracy. |
| Internal 1A NPN switch | Removes need for external MOSFET or transistor, simplifying bill-of-materials and minimizing PCB space. |
| 52kHz fixed-frequency oscillator | Enables predictable EMI spectrum and compatibility with low-cost, off-the-shelf 330µH inductors (e.g., AIE 415-0926). |
| Cycle-by-cycle current limit | Provides immediate overcurrent protection without latch-up, supporting robust operation during short-circuit or startup faults. |
| Thermal shutdown with hysteresis | Shuts down at 150°C and restarts after cooldown, preventing thermal runaway in enclosed or poorly ventilated enclosures. |
Applications
| Industrial PLC Power Supply | Embedded Microcontroller Core Supply |
|---|---|
|
Use Scenario: Providing regulated 3.3V rail to programmable logic controllers operating from 24V DC field buses with transient surges up to 40V. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24V input to clean 3.3V for CPU, memory, and I/O buffers. Use Value: Delivers 1A continuously with 75% efficiency, reducing thermal load versus linear regulators and enabling fanless enclosure design. |
Use Scenario: Powering ARM Cortex-M4 microcontrollers and associated peripherals in portable test equipment with 12V battery input. IC Role / Device Role / Timing Role: Main system regulator supplying core logic voltage with tight tolerance and fast transient response. Use Value: Fixed 3.3V output ensures consistent timing margins; ON/OFF pin enables deep-sleep mode with <200µA system standby current. |
| IoT Sensor Node Power Management | Industrial HMI Display Backlight Supply |
|
Use Scenario: Generating 3.3V for low-power wireless sensor nodes powered by 12V solar-charged batteries with wide temperature variation (–40°C to +85°C). IC Role / Device Role / Timing Role: Efficient DC-DC converter maintaining stable supply across input voltage droop and load steps. Use Value: Guaranteed operation from –40°C to +125°C junction temperature and ±3% output accuracy ensure reliable ADC readings and radio performance. |
Use Scenario: Driving LED backlights in human-machine interface panels using 24V industrial power with minimal heat generation. IC Role / Device Role / Timing Role: Pre-regulator stepping 24V down to 3.3V for downstream LED driver ICs or analog bias circuits. Use Value: High efficiency (75%) and integrated thermal protection prevent backlight dimming or failure due to thermal throttling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-3.3WU-TR | Same electrical specs but TO-263 (U) package with lower θJA (45°C/W) and exposed thermal tab for enhanced heat dissipation. | Better suited for high-ambient-temperature environments or higher duty-cycle loads where thermal headroom is critical. | Select LM2575-3.3WU-TR when board layout allows TO-263 mounting and thermal performance exceeds SOIC limits. |
| LM2596-3.3 | Higher 150kHz switching frequency, 3A output rating, and ±2% output tolerance - requires smaller inductor but adds external compensation components. | Supports higher current and tighter regulation, but increases design complexity and component count vs. LM2575's simplicity. | Choose LM2596-3.3 only if >1A load or <±2% regulation is required; otherwise LM2575-3.3BWM-TR offers lower BOM cost and proven reliability. |
Compared with LM2575-3.3WU-TR, the LM2575-3.3BWM-TR trades thermal performance for compact SOIC footprint and ease of reflow assembly; versus LM2596-3.3, it sacrifices output current and precision for minimal external parts and mature, field-proven stability.
Availability
LM2575-3.3BWM-TR is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded microcontroller core supplies, IoT sensor node power management, and industrial HMI display backlight supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2575-3.3BWM-TR 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
Micrel Inc. was a U.S.-based semiconductor company specializing in power management, analog, and mixed-signal ICs before its acquisition by Microchip Technology in 2015. Known for rugged, high-reliability products targeting industrial and telecom markets.
The LM2575 series was designed as a drop-in, high-efficiency replacement for three-terminal linear regulators in industrial and embedded power applications - emphasizing simplicity, thermal robustness, and minimal external component count.
FAQ
What is the maximum input voltage for LM2575-3.3BWM-TR?
The LM2575-3.3BWM-TR supports a maximum input voltage of 40V under normal operating conditions, with an absolute maximum rating of 45V. Exceeding 40V risks violating guaranteed specifications such as output regulation and efficiency, and sustained operation above 45V may cause permanent damage. Always maintain ≥1V headroom between input and output during dropout conditions.
Does LM2575-3.3BWM-TR require external feedback resistors?
No, the LM2575-3.3BWM-TR does not require external feedback resistors because it is a fixed-output variant with internally trimmed 3.3V regulation. Unlike adjustable versions (e.g., LM2575-ADJ), its feedback node is pre-connected to generate precisely 3.3V, eliminating resistor matching errors and simplifying layout and qualification.
What thermal performance can be expected from LM2575-3.3BWM-TR in its SOIC package?
The LM2575-3.3BWM-TR has a junction-to-ambient thermal resistance (θJA) of 100°C/W when mounted on a PCB with approximately 1 in² of copper area. At 1A load and 12V input, typical power dissipation is ~8.7W, resulting in ~870°C rise above ambient - confirming that derating or forced airflow is required for full-load operation at elevated ambient temperatures.
How does the ON/OFF pin function on LM2575-3.3BWM-TR?
The ON/OFF pin (Pin 22) enables logic-level control of the LM2575-3.3BWM-TR: pulling it to ≥1.4V disables the internal switch and reduces quiescent current to <200µA, while pulling it to ≤1.2V enables normal regulation. This feature supports system-level power sequencing and battery-saving sleep modes without external FETs or level shifters.
Is LM2575-3.3BWM-TR RoHS compliant?
Yes, the LM2575-3.3BWM-TR is RoHS compliant per its ordering designation "BWM" (Pb-Free / RoHS Compliant version in 24-pin wide SOIC). Micrel's documentation confirms compliance with Directive 2011/65/EU, including exemption for high-melting solder where applicable, and all materials meet lead-free reflow profile requirements.
LM2575-3.3BWM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
LM2575-3.3BWM-TR FAQ
1.How can I place an order for LM2575-3.3BWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-3.3BWM-TR 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 LM2575-3.3BWM-TR reliable?
The price and inventory of LM2575-3.3BWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-3.3BWM-TR is usually 5 days.
3.What payment methods are accepted for LM2575-3.3BWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-3.3BWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-3.3BWM-TR?
LM2575-3.3BWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-3.3BWM-TR 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 LM2575-3.3BWM-TR?
For technical support, including LM2575-3.3BWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-3.3BWM-TR requirements.
6.How does Aetrix verify that LM2575-3.3BWM-TR is sourced from the original manufacturer or authorized distributors?
All LM2575-3.3BWM-TR 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 LM2575-3.3BWM-TR meets industry standards.
7.What is the process for return or replacement of LM2575-3.3BWM-TR?
All LM2575-3.3BWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-3.3BWM-TR, 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 LM2575-3.3BWM-TR part is unused and in its original packaging.
Return procedure for LM2575-3.3BWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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