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Microchip Technology LM2575BWM
- Part No.:
- LM2575BWM
- Manufacturer:
- Microchip Technology
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2575BWM.pdf
- Description:
- IC REG BUCK ADJ 1A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
LM2575BWM from Texas Instruments is a 1-A step-down switching regulator IC with fixed 5-V output, 40-V input voltage rating, and 52-kHz switching frequency. It integrates a power transistor, current-limit circuitry, and thermal shutdown protection, and is used in industrial power supplies and embedded system DC-DC conversion.
For engineers reviewing the LM2575BWM datasheet, LM2575BWM pinout, LM2575BWM application, or LM2575BWM equivalent, key selection considerations include its fixed-output architecture, internal 1-A switch, thermal shutdown behavior, and compatibility with standard buck external components (diode, inductor, capacitors).
Technical Context
The LM2575BWM implements a monolithic buck converter topology with internal NPN power transistor and fixed-frequency pulse-width modulation (PWM) control. Its 52-kHz oscillator sets the switching rate, enabling use of low-cost, high-inductance off-the-shelf inductors.
It operates across an input range of 4.75 V to 40 V and delivers up to 1 A load current with ±4% output voltage tolerance over line, load, and temperature. Internal thermal shutdown and current limiting protect against fault conditions without external sensing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V ±4%, eliminating need for external feedback resistors. |
| Max Input Voltage | 40 V, supporting wide-input industrial and automotive battery-supplied systems. |
| Switch Current Limit | 1 A typical, defining maximum continuous output current capability. |
| Switching Frequency | 52 kHz nominal, enabling use of low-cost, high-value inductors (e.g., 100–330 µH). |
| Thermal Shutdown | Activates at ~160°C junction temperature, providing automatic fault recovery. |
| Line Regulation | 0.5% (typical), ensuring stable output despite input voltage variation. |
Pinout & Package
LM2575BWM is housed in a 5-pin TO-220 package with exposed tab for thermal dissipation. Pin 1 is Input, Pin 2 is Ground, Pin 3 is Output, Pin 4 is Feedback (internally tied to 5-V reference), and Pin 5 is ON/OFF (active-low enable).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Input voltage supply connection | Accepts 4.75–40 V DC; requires local ceramic bypass capacitor. |
| Pin 2 (GND) | Power ground reference | Common return path for input, output, and internal circuits; connects to exposed tab. |
| Pin 3 (OUT) | Regulated output node | Delivers 5 V to load; connects to output filter inductor and capacitor. |
| Pin 4 (FB) | Feedback input | Internally connected to 5-V reference; not user-accessible in fixed-output version. |
| Pin 5 (ON/OFF) | Enable/disable control | Active-low logic input; pulling below 1.3 V disables regulator and reduces quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1-A NPN switch | Eliminates need for external power transistor and associated drive circuitry. |
| Fixed 5-V output | Reduces BOM count by removing external feedback resistor network. |
| 52-kHz fixed-frequency PWM | Enables predictable EMI profile and simplifies EMI filter design. |
| Internal thermal shutdown | Provides autonomous protection during overload or poor heatsinking without external sensors. |
Applications
| Industrial Power Supply | Embedded System DC-DC |
|---|---|
Use Scenario: Converting unregulated 12–24 V rail to stable 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5-V bias to microcontrollers and digital logic. Use Value: High input voltage tolerance and integrated protection reduce external component count and improve field reliability. | Use Scenario: Providing clean 5-V supply to ARM Cortex-M based edge controllers in remote monitoring devices. IC Role / Device Role / Timing Role: Main DC-DC converter powering core logic and communication peripherals. Use Value: Fixed output and thermal shutdown simplify design validation and support long-term operation in sealed enclosures. |
| Automotive Aftermarket Electronics | Test & Measurement Equipment |
Use Scenario: Regulating vehicle battery voltage (9–16 V) to 5 V for USB-powered accessories and display modules. IC Role / Device Role / Timing Role: Input-stage buck regulator handling cold-crank and load-dump transients. Use Value: 40-V max input rating accommodates automotive load-dump surges without external clamping. | Use Scenario: Generating 5-V rail for analog front-end circuitry and microcontroller subsystems in portable DMMs. IC Role / Device Role / Timing Role: Isolated secondary-side power source with low-noise output performance. Use Value: Stable line/load regulation ensures accurate ADC reference stability and consistent measurement accuracy. |
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-5.0 | TO-220 package with identical electrical specs but no ON/OFF pin (pin 5 unused). | Lacks enable functionality; suitable only where always-on operation is acceptable. | Select LM2575BWM when active control of regulator state is required. |
| LM2596S-5.0 | Higher 150-kHz switching frequency, 3-A switch, and adjustable/fixed variants available. | Better efficiency at higher loads; requires smaller inductor but tighter layout for EMI. | Choose LM2596S-5.0 for higher current or space-constrained designs; LM2575BWM remains optimal for legacy 52-kHz inductor reuse. |
Compared with LM2575T-5.0 and LM2596S-5.0, the LM2575BWM uniquely combines enable control, 52-kHz operation for cost-effective magnetics, and proven thermal robustness in industrial ambient conditions - making it ideal for retrofit and maintenance-sensitive deployments.
Availability
LM2575BWM is available at Aetrix Electronics and suitable for industrial power supplies, embedded system DC-DC conversion, and automotive aftermarket electronics requiring stable component supply and long-lifecycle support.
Supply support for LM2575BWM 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 specializing in analog and embedded processing technologies, with leadership in power management ICs and industrial-grade components.
The LM2575BWM belongs to TI's classic non-synchronous buck regulator product line, designed for cost-sensitive, thermally demanding applications where simplicity, ruggedness, and long-term availability are prioritized over ultra-high efficiency or ultra-small size.
FAQ
What is the maximum input voltage rating for the LM2575BWM?
The LM2575BWM supports a maximum input voltage of 40 V. This rating allows reliable operation in industrial environments with transient overvoltages and automotive applications experiencing load-dump events. The device maintains regulation down to 4.75 V input, making it compatible with standard 5-V and 12-V supply rails. Exceeding 40 V may cause permanent damage to the internal NPN switch.
Does the LM2575BWM require external feedback resistors to set output voltage?
No, the LM2575BWM does not require external feedback resistors because it is a fixed-output variant with an internally trimmed 5-V reference. Pin 4 (FB) is internally connected to the 5-V reference and is not accessible for adjustment. This eliminates resistor tolerance errors and simplifies PCB layout compared to adjustable versions like the LM2575-ADJ.
How does the ON/OFF pin (Pin 5) function on the LM2575BWM?
The ON/OFF pin on the LM2575BWM is an active-low enable input. Pulling Pin 5 below 1.3 V disables the internal switch and reduces quiescent current to approximately 50 µA. Leaving it open or pulled high (≥2.5 V) enables normal operation. This feature supports power sequencing and standby modes in battery-powered or energy-conscious systems using the LM2575BWM.
What thermal protection mechanism does the LM2575BWM implement?
The LM2575BWM incorporates internal thermal shutdown that activates when the junction temperature exceeds approximately 160°C. Once triggered, the device halts switching until temperature falls below the hysteresis threshold (~140°C), then resumes operation automatically. This protects the LM2575BWM during sustained overload, inadequate heatsinking, or high ambient temperatures without requiring external thermal sensors or circuitry.
Can the LM2575BWM be used with standard off-the-shelf inductors?
Yes, the LM2575BWM's 52-kHz switching frequency is specifically chosen to allow use of low-cost, high-inductance off-the-shelf inductors (typically 100–330 µH). These inductors have lower core loss at low frequencies and are widely available in axial-leaded and surface-mount formats. Designers can select inductors rated for ≥1.2 A DC current to ensure saturation margin under peak load conditions of the LM2575BWM.
LM2575BWM 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:
- 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 FAQ
1.How can I place an order for LM2575BWM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575BWM 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 reliable?
The price and inventory of LM2575BWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575BWM is usually 5 days.
3.What payment methods are accepted for LM2575BWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575BWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575BWM?
LM2575BWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575BWM 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?
For technical support, including LM2575BWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575BWM requirements.
6.How does Aetrix verify that LM2575BWM is sourced from the original manufacturer or authorized distributors?
All LM2575BWM 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 meets industry standards.
7.What is the process for return or replacement of LM2575BWM?
All LM2575BWM units undergo pre-shipment inspection (PSI). If there is an issue with LM2575BWM, 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 part is unused and in its original packaging.
Return procedure for LM2575BWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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