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Microchip Technology LM2575-12BWM
- Part No.:
- LM2575-12BWM
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575-12BWM.pdf
- Description:
- IC REG BUCK 12V 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,411
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Product details
Overview
LM2575-12BWM from Texas Instruments is a monolithic 1-A step-down voltage regulator IC with fixed 12 V output, internal 52-kHz oscillator, and thermal shutdown protection. It operates from 4.75 V to 40 V input, delivers up to 1 A load current, and achieves typical efficiency of 88% at full load. It is used in industrial power supplies and embedded system DC-DC conversion.
For engineers reviewing the LM2575-12BWM datasheet, LM2575-12BWM pinout, LM2575-12BWM application, or LM2575-12BWM equivalent, key selection criteria include input voltage range, fixed output voltage accuracy (±4%), dropout behavior under transient load, thermal performance in TO-220 package, and compatibility with standard external diode and capacitor components.
Technical Context
The LM2575-12BWM integrates a PWM controller, power switch, and protection circuitry in a single TO-220-5 package. Its internal oscillator sets a nominal switching frequency of 52 kHz, enabling use of low-cost electrolytic output capacitors and minimizing EMI filtering complexity.
It employs a voltage-mode control architecture with internal reference (1.23 V), error amplifier, and current-limit sensing. Output regulation is maintained across line (4.75–40 V) and load (0–1 A) variations without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4%; eliminates need for external feedback resistors and simplifies layout. |
| Max Input Voltage | 40 V; supports wide-input industrial and automotive battery-supplied systems. |
| Output Current | 1 A continuous; sufficient for powering microcontrollers, sensors, and analog circuitry. |
| Switching Frequency | 52 kHz typical; enables use of low-ESR aluminum electrolytic capacitors and reduces filter size vs. higher-frequency regulators. |
| Efficiency | 88% typical at 1 A, VIN = 24 V; reduces thermal load and improves power budget in enclosed enclosures. |
| Thermal Shutdown | Activated at TJ ≥ 160°C; protects device during overload or poor heatsinking conditions. |
Pinout & Package
LM2575-12BWM is housed in a TO-220-5 package with exposed tab for thermal dissipation. The tab is electrically connected to Pin 2 (Ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VIN) | Input voltage supply | Accepts 4.75–40 V DC; requires local ceramic bypass capacitor for stability. |
| Pin 2 (GND) | Power and signal ground | Common return for input, output, and feedback; tab connection provides thermal path. |
| Pin 3 (OUT) | Switched output node | Drives external catch diode and output LC filter; high peak current capability. |
| Pin 4 (FEEDBACK) | Regulation sense input | Internally tied to 12 V output; not user-accessible-no external resistor network required. |
| Pin 5 (ON/OFF) | Enable/disable control | Logic-high (>2.5 V) enables operation; logic-low (<1.3 V) disables switching and reduces quiescent current to 50 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 1-A power switch | Eliminates need for external MOSFET or transistor, reducing BOM count and board area. |
| Fixed 12-V output | Removes external feedback divider, improving output accuracy and long-term stability. |
| 52-kHz oscillator | Enables cost-effective passive filtering using standard electrolytic capacitors and shielded inductors. |
| Thermal shutdown + current limit | Provides self-protection under fault conditions without requiring external monitoring circuitry. |
| ON/OFF logic control | Supports system-level power sequencing and standby mode with minimal external logic. |
Applications
| Industrial Power Supply | Embedded Control Module |
|---|---|
Use Scenario: 24-V rail conversion to stable 12-V supply for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator providing isolated, regulated 12-V bus. Use Value: Delivers 1 A with <1% load regulation and withstands 40-V transients common in factory environments. | Use Scenario: Powering MCU, CAN transceiver, and analog front-end in motor drive control boards. IC Role / Device Role / Timing Role: Main 12-V supply regulator with ON/OFF control synchronized to system sleep states. Use Value: Quiescent current drops to 50 µA in shutdown, extending battery-backed runtime during idle periods. |
| Test Equipment Power | Legacy System Retrofit |
Use Scenario: Replacing linear regulators in benchtop multimeters and signal generators to reduce heat and improve efficiency. IC Role / Device Role / Timing Role: Drop-in switching replacement for obsolete 7812-based designs. Use Value: Maintains same 12-V output while cutting power loss by >60% compared to linear solution at 500-mA load. | Use Scenario: Upgrading aging 12-V power rails in telecom shelf controllers where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator replacing discrete switcher designs. Use Value: TO-220-5 package allows direct mounting to chassis for conduction cooling, eliminating need for fan. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575H-12W | Same 12-V fixed output, but rated for -40°C to +125°C junction temperature (vs. -40°C to +125°C for LM2575-12BWM); identical pinout and electrical specs. | Designed for extended-temperature industrial and automotive under-hood use; same PCB footprint. | Select LM2575H-12W when operating ambient exceeds 85°C or qualification to AEC-Q100 is required. |
| LM2596-12 | Higher 3-A output rating, 150-kHz switching frequency, and improved line/load regulation (±1.5% vs. ±4%); requires different external LC values. | Better suited for higher-current or tighter-regulation applications; needs revised filter design and layout. | Choose LM2596-12 only if >1 A output or <2% output tolerance is mandatory; not a drop-in replacement. |
Compared with LM2575H-12W, the LM2575-12BWM offers identical functionality at standard temperature grade, while LM2596-12 provides higher current and precision at the cost of redesign effort and increased switching noise.
Availability
LM2575-12BWM is available at Aetrix Electronics and suitable for industrial power supplies, embedded control modules, and test equipment requiring stable component supply and long-term manufacturability.
Supply support for LM2575-12BWM 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2575 series was designed as a cost-effective, easy-to-use buck regulator family targeting replacement of linear regulators in medium-power DC-DC applications where simplicity and reliability are prioritized over ultra-high efficiency or ultra-small size.
FAQ
What is the maximum input voltage rating for the LM2575-12BWM?
The LM2575-12BWM has an absolute maximum input voltage rating of 45 V, with recommended continuous operation up to 40 V. Exceeding 40 V may reduce reliability or trigger overvoltage protection in some units. Always observe derating guidelines in TI's official datasheet for LM2575-12BWM when designing for transient-heavy environments like automotive jump-start scenarios.
Does the LM2575-12BWM require external feedback resistors?
No - the LM2575-12BWM features an internally trimmed 12-V output, so the FEEDBACK pin (Pin 4) is pre-connected and not accessible for external adjustment. This eliminates resistor tolerance errors and drift, ensuring consistent 12-V output across temperature and time without calibration. The LM2575-12BWM is functionally distinct from adjustable versions like LM2575-ADJ.
Can the LM2575-12BWM be used in a synchronous rectifier configuration?
No - the LM2575-12BWM uses an internal NPN bipolar power switch and requires an external catch diode (e.g., SB560). It does not support synchronous rectification, nor does it provide gate drive signals for an external MOSFET. For synchronous operation, consider TI's LM2596 or TPS5430 families instead of the LM2575-12BWM.
What thermal considerations apply to the LM2575-12BWM in TO-220-5 package?
The LM2575-12BWM's TO-220-5 package exposes the ground tab as a thermal path. With no heatsink, its junction-to-ambient thermal resistance is ~65°C/W. At 1 A output and 24-V input, power dissipation reaches ~12 W - requiring a minimum 25 cm² aluminum heatsink or forced airflow. Thermal shutdown activates at 160°C junction temperature, making heatsink sizing critical for continuous operation.
Is the LM2575-12BWM RoHS compliant and lead-free?
Yes - the LM2575-12BWM is manufactured in a RoHS-compliant, lead-free process per TI's packaging standards. The TO-220-5 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3. Full compliance documentation, including material declarations and test reports, is available through TI's official product page for LM2575-12BWM.
LM2575-12BWM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- 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):
- 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:
- 24-SOIC
LM2575-12BWM FAQ
1.How can I place an order for LM2575-12BWM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-12BWM 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 LM2575-12BWM reliable?
The price and inventory of LM2575-12BWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-12BWM is usually 5 days.
3.What payment methods are accepted for LM2575-12BWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575-12BWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575-12BWM?
LM2575-12BWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-12BWM 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 LM2575-12BWM?
For technical support, including LM2575-12BWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-12BWM requirements.
6.How does Aetrix verify that LM2575-12BWM is sourced from the original manufacturer or authorized distributors?
All LM2575-12BWM 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 LM2575-12BWM meets industry standards.
7.What is the process for return or replacement of LM2575-12BWM?
All LM2575-12BWM units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-12BWM, 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 LM2575-12BWM part is unused and in its original packaging.
Return procedure for LM2575-12BWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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