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Microchip Technology LM2575BWM-TR
- Part No.:
- LM2575BWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575BWM-TR.pdf
- Description:
- IC REG BUCK ADJ 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,674
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Product details
Overview
LM2575BWM-TR from Micrel is a fixed-output 5V, 1A step-down (buck) switching regulator in 24-pin wide SOIC package, featuring 52kHz fixed-frequency operation, ±3% output voltage tolerance at full load, internal current limiting, thermal shutdown, and <200µA standby current. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575BWM-TR datasheet, LM2575BWM-TR pinout, LM2575BWM-TR application, or LM2575BWM-TR equivalent, key selection criteria include input voltage range (4–40V), guaranteed 1A output, TO-220-compatible pinout in SOIC, thermal performance (θJA = 100°C/W), and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575BWM-TR integrates a 52kHz oscillator, error amplifier with 1.23V bandgap reference, PWM comparator, and 1A NPN switch driver. Its feedback loop uses external resistive divider for adjustable versions or internal resistor network for fixed outputs like the 5V variant.
Protection functions include cycle-by-cycle current limiting (1.7–3.2A 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 across –40°C to +125°C junction temperature range with no minimum load requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over 0.2–1A load and 8–40V input ensures stable rail for microcontrollers and logic circuits. |
| Max Output Current | Guaranteed 1A continuous output enables direct powering of FPGA I/O banks or sensor modules without external boost stages. |
| Input Voltage Range | 4V to 40V DC supports wide-input industrial systems including 12V/24V battery and unregulated rectified AC supplies. |
| Switching Frequency | 52kHz ±10% fixed frequency simplifies EMI filtering design and avoids audible noise while enabling use of low-cost standard inductors. |
| Efficiency | 82% typical at 12VIN/5VOUT/1A reduces thermal load versus linear regulators, often eliminating need for heatsinks. |
| Standby Current | <200µA when ON/OFF pin pulled high enables low-power sleep modes in battery-backed systems. |
| Thermal Resistance | θJA = 100°C/W (24-pin SOIC) defines PCB copper area requirements for safe 1A operation at 85°C ambient. |
Pinout & Package
LM2575BWM-TR uses a 24-pin wide SOIC package (package code WM) with exposed thermal pad. Pin numbering follows standard SOIC layout; pins 1–24 are assigned as per Micrel's official pin configuration diagram (page 4 of datasheet M9999-051209-B).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16, 22 | VIN | Main input supply connection; accepts 4–40V DC; requires local 100µF input capacitor for stability. |
| 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 23, 24 | GND | Power and signal ground return paths; multiple pins reduce impedance and improve thermal conduction to PCB. |
| 2 | OUT | Switched output node driving external inductor; connects to catch diode anode and output capacitor positive terminal. |
| 8 | FB | Feedback input for adjustable versions; internally connected to 5V divider in LM2575BWM-TR - not user-accessible. |
| 9 | ON/OFF | Logic-level enable/disable control; >1.4V enables regulation, <1.2V disables output and reduces quiescent current to <200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A NPN switch | Eliminates need for external MOSFET or transistor, reducing BOM count and layout complexity in compact designs. |
| Fixed 5V output with ±3% tolerance | Meets tight regulation requirements for 5V logic rails without trimming or calibration during production. |
| Internal frequency compensation | Enables stable operation with only four external components: input cap, output cap, inductor, and catch diode. |
| Thermal shutdown + current limit | Provides autonomous fault protection under overload, short-circuit, or inadequate heatsinking conditions. |
| Standard inductor compatibility | Works with widely available 330µH shielded inductors (e.g., AIE 415-0926), accelerating power stage prototyping. |
Applications
| Industrial PLC I/O Power | Embedded Controller Core Supply |
|---|---|
Use Scenario: Providing isolated 5V rail for digital input/output modules in programmable logic controllers operating from 24VDC field buses. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24V bus to clean 5V for optocoupler drivers and level translators. Use Value: High efficiency (>80%) minimizes heat buildup in sealed enclosures; 40V max input withstands 24V bus transients per IEC 61000-4-5. | Use Scenario: Generating 5V core supply for ARM Cortex-M4 microcontrollers in edge IoT gateways powered by 12V PoE injectors. IC Role / Device Role / Timing Role: Main system regulator delivering 1A to MCU, USB PHY, and SPI peripherals with low ripple and fast transient response. Use Value: 52kHz switching allows small LC filter size; ON/OFF pin enables synchronized deep-sleep entry with <200µA system standby current. |
| On-Board DC-DC Conversion | Pre-Regulator for Linear LDOs |
Use Scenario: Local 5V generation on dense PCBs where space prohibits through-hole TO-220 regulators. IC Role / Device Role / Timing Role: Surface-mount buck converter replacing LM7805 in space-constrained applications using 24-pin SOIC footprint. Use Value: Wide SOIC package offers better thermal performance than DIP while maintaining compatibility with automated SMT assembly lines. | Use Scenario: Reducing dropout voltage and heat dissipation before low-noise LDOs powering analog sensors or ADC references. IC Role / Device Role / Timing Role: Efficient pre-regulator stepping 24V down to 5.5V, feeding low-dropout linear regulator for ultra-low-noise 5V output. Use Value: 82% efficiency at 1A cuts pre-regulator power loss by >75% vs. linear solution, enabling single-layer thermal relief design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-5.0 | Same 5V fixed output, but in 5-pin TO-220 package with θJA = 65°C/W; higher thermal performance but through-hole mounting required. | Preferred for high-ambient-temperature environments (>70°C) where heatsink attachment is feasible and SMT is not mandatory. | Select LM2575T-5.0 when board-level thermal management prioritizes heatsink integration over surface-mount automation. |
| LM2596S-5.0 | Higher 3A rating, 150kHz switching, and improved efficiency (up to 92%), but different pinout and external compensation requirements. | Suitable for higher-current upgrades or designs needing smaller magnetics; not drop-in compatible due to differing FB/COMP architecture. | Choose LM2596S-5.0 only when redesigning for >1A loads or tighter size constraints - not as direct replacement for LM2575BWM-TR. |
Compared with LM2575T-5.0, LM2575BWM-TR trades thermal margin for SMT manufacturability and board space savings; versus LM2596S-5.0, it offers simpler design with fewer external components but lower current capability and efficiency.
Availability
LM2575BWM-TR is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded controller core rails, on-board DC-DC conversion, and pre-regulator applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2575BWM-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 analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. Its products targeted industrial, communications, and embedded markets.
The LM2575 series was designed as a monolithic, easy-to-use buck regulator family to replace inefficient linear regulators in cost-sensitive, medium-power applications - emphasizing minimal external parts, robust protection, and broad input voltage support.
FAQ
What is the maximum input voltage rating for LM2575BWM-TR?
The absolute maximum input voltage for LM2575BWM-TR is 45V DC, with recommended continuous operation up to 40V. Exceeding 40V may trigger internal protection or reduce reliability. This rating enables use with 24V industrial buses and rectified 30VAC supplies while maintaining safety margin.
Does LM2575BWM-TR require an external feedback resistor network?
No, LM2575BWM-TR is a fixed 5V output version - its feedback divider is fully internal. Pin 8 (FB) is not accessible for adjustment and must remain unconnected. Only adjustable variants (e.g., LM2575BWM) use external resistors to set output voltage between 1.23V and 37V.
Can LM2575BWM-TR be used in negative-output configurations?
Yes, LM2575BWM-TR supports inverting buck-boost topology to generate negative voltages. When configured as a positive-to-negative converter, it delivers regulated negative output (e.g., –5V) using standard external components - as documented in Micrel's typical applications section (page 1 of datasheet).
What is the thermal resistance (θJA) of LM2575BWM-TR in its SOIC package?
The junction-to-ambient thermal resistance (θJA) for LM2575BWM-TR in the 24-pin wide SOIC package is 100°C/W under standard PCB conditions (≈1 in² copper area). This value assumes no external heatsink and defines the maximum power dissipation allowable for safe operation at specified ambient temperatures.
Is LM2575BWM-TR RoHS compliant?
Yes, LM2575BWM-TR is Pb-free and RoHS compliant per Micrel's ordering information (page 3 of datasheet), designated with "Y" suffix in alternate part numbers (e.g., LM2575YWM-*). The "B" prefix indicates commercial-grade temperature range (–40°C to +85°C) and standard packaging.
LM2575BWM-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- 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
LM2575BWM-TR FAQ
1.How can I place an order for LM2575BWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575BWM-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 LM2575BWM-TR reliable?
The price and inventory of LM2575BWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575BWM-TR is usually 5 days.
3.What payment methods are accepted for LM2575BWM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575BWM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575BWM-TR?
LM2575BWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575BWM-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 LM2575BWM-TR?
For technical support, including LM2575BWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575BWM-TR requirements.
6.How does Aetrix verify that LM2575BWM-TR is sourced from the original manufacturer or authorized distributors?
All LM2575BWM-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 LM2575BWM-TR meets industry standards.
7.What is the process for return or replacement of LM2575BWM-TR?
All LM2575BWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2575BWM-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 LM2575BWM-TR part is unused and in its original packaging.
Return procedure for LM2575BWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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