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Texas Instruments LM2574M-12/NOPB
- Part No.:
- LM2574M-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574M-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,148
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Product details
Overview
LM2574M-12/NOPB from Texas Instruments is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 12V output, 52 kHz internal oscillator, 40V maximum input voltage, ±4% output voltage tolerance over line and load, and thermal shutdown protection. It replaces linear regulators in industrial power supplies requiring efficient DC-DC conversion with minimal external components.
For engineers reviewing the LM2574M-12/NOPB datasheet, LM2574M-12/NOPB pinout, LM2574M-12/NOPB application, or LM2574M-12/NOPB equivalent, key selection criteria include guaranteed 0.5A output current, fixed 12V output, M14B SOIC-14 package thermal resistance (78°C/W with 4 in² copper), ON/OFF control with 50 µA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2574M-12/NOPB integrates a PWM controller, power switch, oscillator, error amplifier, and current-limit circuit in a single SOIC-14 package. Its fixed-frequency 52 kHz operation enables predictable EMI filtering and simplifies inductor selection using standardized 330 µH designs.
It operates in continuous conduction mode for loads ≥100 mA and transitions to discontinuous mode at lighter loads. Protection features include cycle-by-cycle current limiting (1.0 A peak), thermal shutdown, and TTL-compatible ON/OFF control with 1.4 V logic-high threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over 15–40 V input and 0.1–0.5 A load - ensures stable rail for microcontrollers and analog circuitry without external feedback resistors. |
| Max Output Current | 0.5 A - supports mid-power embedded systems such as PLC I/O modules and sensor signal conditioning stages. |
| Input Voltage Range | 40 V max (LM2574 series) - accommodates unregulated 24 V industrial bus inputs with margin for transients. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., Pulse PE-52627) and reduces core loss vs. higher-frequency alternatives. |
| Efficiency | 88% at VIN = 15 V, IOUT = 0.5 A - minimizes thermal load on PCB; copper traces serve as primary heatsink per design guidelines. |
| Standby Current | 50 µA typical at OFF pin = 5 V - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Resistance | 78 °C/W (θJA, 4 in² copper) - defines safe power dissipation limit (~1.2 W max at 125°C junction) without external heatsink. |
Pinout & Package
LM2574M-12/NOPB uses the M14B 14-pin wide-body SOIC package (JEDEC MS-013AC), optimized for thermal performance with exposed pad grounding and 4 in² PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply connection | Accepts 4–40 V DC; requires ≥22 µF aluminum electrolytic bypass capacitor placed adjacent to pin. |
| 2 (GND) | Power ground reference | Common return for input/output capacitors, inductor, and catch diode; must connect to large copper pour for thermal management. |
| 3 (OUT) | Switching node | Drives external catch diode anode and inductor; carries pulsed 0.5 A current; layout critical to minimize EMI and voltage spikes. |
| 4 (FEEDBACK) | Output voltage sense input | Not connected in fixed-output versions; internally tied to 12 V divider - eliminates external resistor network. |
| 5 (ON/OFF) | Enable/disable control | TTL-compatible; <1.2 V = ON, >1.4 V = OFF; draws only 50 µA in shutdown - ideal for microcontroller-controlled power sequencing. |
| 6–14 | No internal connection | Unused pins; recommended to solder to PCB ground plane for mechanical stability and improved thermal conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while ensuring ±4% regulation across temperature and load. |
| Internal 52 kHz oscillator | Removes need for external timing components; enables predictable EMI profile and simplifies compliance testing for industrial emissions standards. |
| Cycle-by-cycle current limit | Guarantees 1.0 A peak switch current limit - protects against short-circuit faults without external sensing or foldback circuitry. |
| TTL shutdown capability | Supports precise power-state control via microcontroller GPIO; 50 µA standby current extends battery life in portable instrumentation. |
| Thermal shutdown | Activates at ~150°C junction temperature - prevents permanent damage during overload or poor heatsinking conditions. |
Applications
| Industrial Power Supply | Microcontroller Core Rail |
|---|---|
Use Scenario: Providing regulated 12 V from noisy 24 V factory bus for programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, stable 12 V to isolated digital and analog signal conditioning circuits. Use Value: High efficiency (88%) avoids forced-air cooling; ±4% output tolerance ensures reliable ADC reference and relay driver operation across temperature. | Use Scenario: Generating local 12 V supply for ARM Cortex-M4-based motor control board with CAN interface. IC Role / Device Role / Timing Role: On-card DC-DC converter powering MCU peripherals, gate drivers, and communication transceivers. Use Value: 52 kHz switching frequency allows use of compact 330 µH inductors; ON/OFF pin enables synchronized power-down during sleep states. |
| Sensor Signal Conditioning | Legacy System Retrofit |
Use Scenario: Replacing aging 7812 linear regulator in vibration sensor node to reduce thermal stress on sealed enclosure. IC Role / Device Role / Timing Role: Efficient pre-regulator stepping down 24 V field power to 12 V for op-amp front-end and ADC biasing. Use Value: 0.5 A output supports multiple sensors; thermal shutdown prevents failure in confined spaces with limited airflow. | Use Scenario: Upgrading legacy test equipment power supply to improve efficiency and reliability without PCB redesign. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 7812 with identical 12 V output and compatible pinout footprint (SOIC-14 vs TO-220). Use Value: Requires only four external components (inductor, diode, input/output caps); no changes to existing layout needed beyond mounting pad adaptation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-12 | Higher 3 A output current, 52 kHz frequency, wider 40 V input range, but larger SOIC-16 package and higher quiescent current (10 mA vs 5 mA). | Better suited for higher-current loads (>0.5 A) or systems requiring greater fault margin; less optimal for space-constrained 0.5 A designs. | Select LM2576-12 only if load exceeds 0.5 A or additional headroom for future expansion is required. |
| TPS54202DR | 2 A synchronous buck, 4.5–28 V input, 570 kHz switching, integrated high/low-side FETs, but requires external compensation and lacks built-in thermal shutdown. | Enables smaller solution size and higher efficiency at light loads, but demands more complex design validation and layout expertise. | Choose TPS54202DR when board space is critical and engineering resources exist for loop compensation tuning. |
Compared with LM2576-12 and TPS54202DR, the LM2574M-12/NOPB delivers optimal simplicity for 0.5 A fixed 12 V applications - requiring only four passive components, offering proven thermal protection, and supporting direct retrofit into legacy linear regulator footprints with minimal layout impact.
Availability
LM2574M-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded sensor systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2574M-12/NOPB 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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for the SIMPLE SWITCHER™ product line.
The LM2574M-12/NOPB belongs to TI's SIMPLE SWITCHER™ family of integrated buck regulators, designed specifically for cost-sensitive, thermally constrained industrial and embedded applications where ease of design and robustness outweigh ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for the LM2574M-12/NOPB?
The LM2574M-12/NOPB has a maximum input voltage rating of 40 V, as specified in the Absolute Maximum Ratings table. This applies to the standard LM2574 series (non-HV variant); exceeding this voltage risks permanent device damage. For applications requiring >40 V input, the LM2574HV-12 variant (60 V max) must be used instead of the LM2574M-12/NOPB.
Does the LM2574M-12/NOPB require external feedback resistors to set its output voltage?
No, the LM2574M-12/NOPB does not require external feedback resistors. It is a fixed-output version with the 12 V regulation network internal to the IC. Pin 4 (FEEDBACK) is not connected internally and must remain unconnected in the LM2574M-12/NOPB - unlike the adjustable LM2574M-ADJ variant, which relies on external R1/R2 dividers.
What is the thermal resistance (θJA) of the LM2574M-12/NOPB in its M14B package?
The LM2574M-12/NOPB in the M14B SOIC-14 package has a junction-to-ambient thermal resistance (θJA) of 78 °C/W when mounted on a PCB with 4 square inches of 1 oz. copper. With only 1 square inch of copper, θJA rises to 102 °C/W. These values are measured under standardized JEDEC conditions and define the maximum power dissipation before thermal shutdown activates.
Can the LM2574M-12/NOPB be used in discontinuous conduction mode?
Yes, the LM2574M-12/NOPB operates reliably in both continuous and discontinuous conduction modes. At light loads (<100 mA), inductor current naturally drops to zero during part of the switching cycle. The IC's internal current limit and oscillator behavior remain fully functional, and no external modifications are needed - making it suitable for variable-load applications like intermittent sensor polling.
What type of catch diode is recommended for use with the LM2574M-12/NOPB?
A Schottky diode rated for ≥1 A average current and ≥50 V reverse voltage is recommended for the LM2574M-12/NOPB, such as the MBR150 or SR105. The diode must handle peak currents up to 1.0 A (cycle-by-cycle limit) and withstand input transients; Schottky construction minimizes forward voltage drop and improves efficiency compared to fast-recovery silicon diodes.
LM2574M-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 500mA
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LM2574M-12/NOPB FAQ
1.How can I place an order for LM2574M-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574M-12/NOPB 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 LM2574M-12/NOPB reliable?
The price and inventory of LM2574M-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574M-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574M-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574M-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574M-12/NOPB?
LM2574M-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574M-12/NOPB 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 LM2574M-12/NOPB?
For technical support, including LM2574M-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574M-12/NOPB requirements.
6.How does Aetrix verify that LM2574M-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574M-12/NOPB 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 LM2574M-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574M-12/NOPB?
All LM2574M-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574M-12/NOPB, 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 LM2574M-12/NOPB part is unused and in its original packaging.
Return procedure for LM2574M-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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