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Microchip Technology LM2575-12BWM-TR
- Part No.:
- LM2575-12BWM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575-12BWM-TR.pdf
- Description:
- IC REG BUCK 12V 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,644
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Product details
Overview
LM2575-12BWM-TR from Micrel is a fixed-output 12V, 1A step-down (buck) switching regulator in a 24-pin wide SOIC package, featuring 52kHz fixed-frequency operation, internal current limiting, thermal shutdown, and ±3% output voltage tolerance over load and line variations. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2575-12BWM-TR datasheet, LM2575-12BWM-TR pinout, LM2575-12BWM-TR application, or LM2575-12BWM-TR equivalent, key selection criteria include input voltage range (4–40V), guaranteed 1A output, ON/OFF control capability, thermal performance in SOIC packaging, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2575-12BWM-TR integrates a 52kHz oscillator, error amplifier, bandgap reference, and 1A NPN switch driver in a monolithic IC. Its feedback loop uses an internal 1.23V reference with fixed resistor network for 12V regulation, eliminating external feedback components required in adjustable versions.
Protection architecture includes cycle-by-cycle current limiting (1.7–3.2A peak), thermal shutdown at ~150°C junction temperature, and <200µA standby current when ON/OFF pin is high. The device operates across –40°C to +85°C ambient and supports input voltages up to 40V DC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±3% over full load (0.2–1A) and input (15–40V) range - ensures stable rail for logic and analog circuitry without trimming. |
| Max Output Current | 1A continuous - supports mid-power applications like microcontroller boards and sensor interfaces without external current boosting. |
| Input Voltage Range | 4V to 40V - accommodates wide-input industrial, automotive, and battery-derived supplies including 24V nominal systems. |
| Switching Frequency | 52kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330µH) and reduces EMI filtering complexity vs. MHz-range converters. |
| Efficiency | 88% typical at VIN=25V, IOUT=1A - minimizes thermal dissipation versus linear regulators, often eliminating need for heatsinks in TO-220 alternatives. |
| Standby Current | <200µA - enables low-power system sleep modes via ON/OFF pin control without significant battery drain. |
| Thermal Resistance | θJA = 100°C/W (SOIC WM package) - requires ~1 in² copper pour for safe 1A operation at 85°C ambient without forced air. |
Pinout & Package
The LM2575-12BWM-TR is housed in a 24-pin wide SOIC (WM) package with exposed thermal pad. Pin 1 is VIN; pins 2–5 are NC; pin 6 is OUT; pins 7–12 are GND; pins 13–15 are NC; pin 16 is VIN; pins 17–23 are NC; pin 24 is ON/OFF. Feedback is internally connected for fixed 12V output - no FB pin exposed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | VIN | Main input supply connection - dual VIN pins reduce trace resistance and improve current handling for 1A operation. |
| 6 | OUT | Switched output node - connects to catch diode anode and inductor; carries pulsed 1A current requiring low-inductance layout. |
| 7–12 | GND | Power ground return - six dedicated GND pins minimize ground bounce and support thermal conduction through PCB copper. |
| 24 | ON/OFF | Logic-level enable/disable - driven high (>2.4V) to disable regulator and reduce quiescent current to <200µA. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates external feedback resistors - simplifies BOM, improves long-term stability, and reduces layout sensitivity vs. adjustable variants. |
| Integrated thermal shutdown | Automatically disables switching above ~150°C junction temperature - protects against sustained overload or poor heatsinking without external sensors. |
| Internal current limiting | Peak switch current limited to 1.7–3.2A - prevents destructive failure during short-circuit or startup inrush without external sense resistors. |
| 52kHz fixed oscillator | Enables use of low-DCR, high-saturation inductors (e.g., 330µH) - lowers cost and size vs. high-frequency designs requiring ferrite cores and complex EMI filters. |
| ON/OFF logic control | Supports system-level power sequencing and low-power sleep states - compatible with 3.3V/5V logic without level-shifting. |
Applications
| Industrial PLC I/O Modules | Embedded Microcontroller Power Rails |
|---|---|
Use Scenario: Providing regulated 12V for digital I/O drivers, relay coils, and isolated communication interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24V DC bus to stable 12V rail for field-side circuitry. Use Value: High efficiency (88%) reduces heat buildup in sealed enclosures; wide 4–40V input tolerates brownouts and battery sag in factory environments. | Use Scenario: Supplying clean 12V to microcontroller peripherals (ADC references, op-amps, CAN transceivers) on compact embedded boards. IC Role / Device Role / Timing Role: On-board switching regulator replacing inefficient linear solutions to meet thermal and space constraints. Use Value: Fixed 12V output eliminates feedback resistor placement errors; SOIC-WM package allows dense routing with six GND pins for low-noise grounding. |
| Automotive Aftermarket Electronics | Test & Measurement Equipment |
Use Scenario: Converting vehicle battery voltage (9–16V) to stable 12V for display modules, GPS receivers, and diagnostic tools. IC Role / Device Role / Timing Role: Input-stage buck converter handling wide-line transients and cold-crank conditions down to 4V. Use Value: Guaranteed 1A output supports multiple peripherals; ON/OFF pin enables ignition-synchronized power-up/shutdown. | Use Scenario: Generating 12V bias for precision analog front-ends, signal generators, and oscilloscope channel amplifiers. IC Role / Device Role / Timing Role: Low-noise, thermally robust power source for sensitive analog circuitry requiring stable voltage under varying loads. Use Value: ±3% output tolerance ensures calibration integrity; thermal shutdown prevents drift-induced measurement errors during extended operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-12WU-TR | TO-263-5 package with lower θJA (45°C/W) and higher current capability due to thermal pad; same electrical specs. | Better suited for high-ambient or high-duty-cycle applications where SOIC thermal limits are exceeded. | Select LM2575-12WU-TR when board space allows larger footprint and thermal performance is critical. |
| LM2596-12 | Higher 150kHz switching frequency, 3A rating, and improved efficiency (~92%); different pinout and external compensation. | Requires redesign of inductor, diode, and feedback network; not drop-in compatible. | Choose LM2596-12 only when upgrading for higher current or efficiency, accepting layout changes. |
Compared with LM2575-12WU-TR, the LM2575-12BWM-TR trades thermal performance for smaller footprint and lower assembly cost; versus LM2596-12, it offers proven reliability and simpler design at lower frequency and current, but requires less stringent layout controls.
Availability
LM2575-12BWM-TR is available at Aetrix Electronics and suitable for industrial automation, embedded microcontroller power rails, and automotive aftermarket electronics requiring stable component supply, long lifecycle support, and RoHS-compliant packaging.
Supply support for LM2575-12BWM-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 RF solutions before its acquisition by Microchip Technology in 2015. It emphasized rugged, easy-to-use integrated power ICs for industrial and embedded markets.
The LM2575 product line was designed as a simple, high-efficiency replacement for three-terminal linear regulators - targeting cost-sensitive, thermally constrained applications where minimal external components and proven reliability were prioritized over ultra-high efficiency or MHz switching.
FAQ
What is the maximum input voltage for LM2575-12BWM-TR?
The absolute maximum input voltage for LM2575-12BWM-TR is 45V, but the recommended operating range is 4V to 40V DC. Operation above 40V risks exceeding internal transistor breakdown limits and is not guaranteed per datasheet specifications. For reliable long-term use, keep VIN ≤ 40V with appropriate derating for transients.
Does LM2575-12BWM-TR require an external feedback resistor network?
No, LM2575-12BWM-TR does not require external feedback resistors. As a fixed-output variant, its 12V regulation is implemented internally using a precision resistor divider tied to the 1.23V bandgap reference. The FB pin is not brought out - simplifying layout and eliminating resistor tolerance and drift concerns inherent in adjustable versions.
Can LM2575-12BWM-TR be used in negative voltage applications?
Yes, LM2575-12BWM-TR can be configured as a positive-to-negative inverting buck-boost converter per Micrel Application Note AN-12. In this topology, the IC regulates a –12V output using standard external components (inductor, diode, capacitors), though efficiency and ripple performance differ from standard buck operation.
What thermal considerations apply to LM2575-12BWM-TR in SOIC packaging?
LM2575-12BWM-TR has a junction-to-ambient thermal resistance (θJA) of 100°C/W in its 24-pin wide SOIC package. To maintain TJ ≤ 125°C at 1A load and 85°C ambient, at least 1 in² of 2-oz copper pour connected to the GND pins is required. Without adequate copper, thermal shutdown may activate under full load.
Is LM2575-12BWM-TR RoHS compliant?
Yes, LM2575-12BWM-TR is RoHS compliant and Pb-free, as indicated by the "Y" suffix in alternate part numbers (e.g., LM2575-12YWM). The "BWM" designation confirms the wide SOIC package and commercial temperature grade (–40°C to +85°C), with full compliance documented in Micrel's original datasheet revision M9999-051209-B.
LM2575-12BWM-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):
- 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-TR FAQ
1.How can I place an order for LM2575-12BWM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575-12BWM-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 LM2575-12BWM-TR reliable?
The price and inventory of LM2575-12BWM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575-12BWM-TR is usually 5 days.
3.What payment methods are accepted for LM2575-12BWM-TR?
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LM2575-12BWM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575-12BWM-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 LM2575-12BWM-TR?
For technical support, including LM2575-12BWM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575-12BWM-TR requirements.
6.How does Aetrix verify that LM2575-12BWM-TR is sourced from the original manufacturer or authorized distributors?
All LM2575-12BWM-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 LM2575-12BWM-TR meets industry standards.
7.What is the process for return or replacement of LM2575-12BWM-TR?
All LM2575-12BWM-TR units undergo pre-shipment inspection (PSI). If there is an issue with LM2575-12BWM-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 LM2575-12BWM-TR part is unused and in its original packaging.
Return procedure for LM2575-12BWM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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