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Texas Instruments LM2574MX-12/NOPB
- Part No.:
- LM2574MX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574MX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,441
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Product details
Overview
LM2574MX-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, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring efficient 12V rail generation from unregulated DC sources.
For engineers reviewing the LM2574MX-12/NOPB datasheet, LM2574MX-12/NOPB pinout, LM2574MX-12/NOPB application, or LM2574MX-12/NOPB equivalent, this page delivers verified technical context, package-specific pin functions, real-world application constraints, and validated alternative options for board-level power design.
Technical Context
The LM2574MX-12/NOPB implements a fixed-frequency, current-mode buck topology with an integrated NPN switch, internal frequency compensation, and TTL-compatible ON/OFF control. Its 52 kHz oscillator enables use of low-cost, standard inductors while maintaining stable regulation across 0.1–0.5A load range.
It operates in continuous conduction mode under typical loads, delivering 12V ±4% over input voltages from 15V to 40V and junction temperatures from −40°C to +125°C. Protection includes thermal shutdown, peak current limiting (1.0A typical), and 50 µA standby current during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% over full temperature and load range - ensures stable logic or analog supply without external feedback resistors. |
| Max Input Voltage | 40V - supports wide-input industrial or automotive-derived DC rails without external pre-regulation. |
| Output Current | Guaranteed 0.5A - sufficient for powering microcontrollers, sensors, and peripheral ICs directly from the regulator. |
| Oscillator Frequency | 52 kHz ±10% - enables use of off-the-shelf, low-DCR inductors (e.g., 330 µH) and simplifies EMI filtering. |
| Efficiency | 88% at VIN = 15V, IOUT = 0.5A - reduces thermal load on PCB; copper traces serve as primary heatsink. |
| Standby Current | 50 µA typical at shutdown - enables low-power sleep modes in battery-backed or energy-sensitive systems. |
| Thermal Resistance | 78 °C/W (θJA, M package with 4 in² copper) - defines PCB copper area needed to maintain TJ ≤ 125°C at full load. |
Pinout & Package
LM2574MX-12/NOPB uses the 14-lead wide-body surface-mount (WM) package (NS package code M14B), optimized for thermal performance and high-voltage isolation. The exposed pad is internally connected to GND and must be soldered to a large PCB copper area for effective heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 15–40V DC; requires ≥22 µF input capacitor placed adjacent to pin for stability. |
| 2 (GND) | Power Ground | Primary return path for switch current; connects to exposed thermal pad and system ground plane. |
| 3 (OUT) | Switch Node | Drives external catch diode and inductor; carries high di/dt switching current - routing must minimize loop area. |
| 4 (GND) | Power Ground | Second ground connection to reduce impedance; ties to same ground plane as Pin 2 and thermal pad. |
| 5 (FEEDBACK) | Not connected | Internally tied to 12V output; no external resistor network required for fixed-output operation. |
| 6 (ON/OFF) | Shutdown Control | TTL-compatible enable input; <1.2V disables regulator (50 µA IQ), >2.2V enables normal operation. |
| 7–14 | NC / Thermal Pad | Pins 7–13 are no-connect; Pin 14 is GND-connected thermal pad - must be soldered to ≥1 in² copper for θJA = 78 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates external feedback resistors and layout sensitivity - reduces BOM count and improves long-term output stability. |
| Internal 52 kHz oscillator | Enables use of standardized, low-cost inductors (e.g., Pulse PE-52627) without external timing components. |
| TTL shutdown interface | Allows direct connection to microcontroller GPIO without level-shifting; achieves 50 µA quiescent current in OFF state. |
| Cycle-by-cycle current limit | Protects against short-circuit or overload by limiting peak switch current to ~1.0A - prevents inductor saturation and MOSFET failure. |
| Thermal shutdown | Automatically disables regulator if junction temperature exceeds ~150°C - prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Industrial PLC I/O Power | Embedded Controller Core Supply |
|---|---|
Use Scenario: Providing isolated 12V power to digital I/O modules in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V bus to clean, regulated 12V for optocoupler drivers and level translators. Use Value: 88% efficiency minimizes heat buildup in sealed enclosures; 40V max input accommodates bus transients up to ±20%. |
Use Scenario: Generating 12V supply for ARM Cortex-M7 microcontrollers and associated peripherals in edge gateway devices. IC Role / Device Role / Timing Role: Main DC/DC converter feeding LDOs that supply core and I/O domains; enabled via MCU GPIO during boot sequence. Use Value: 50 µA shutdown current extends battery backup runtime; fixed output eliminates calibration drift over temperature and life. |
| On-Card Buck Pre-Regulator | Positive-to-Negative Converter (Buck-Boost) |
Use Scenario: Local 12V rail generation on high-density PCBs where centralized 12V distribution causes excessive IR drop. IC Role / Device Role / Timing Role: Point-of-load regulator placed near power-hungry FPGAs or ADCs to maintain tight voltage tolerance under dynamic load steps. Use Value: 0.5A output supports burst-mode loads; 52 kHz switching allows compact LC filter design with minimal footprint impact. |
Use Scenario: Generating −12V rail from +24V input for op-amp biasing in precision analog front-ends. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using external diode and inductor to produce negative output. Use Value: Fixed 12V internal reference enables accurate −12V output when combined with matched external components; thermal protection prevents latch-up during polarity reversal faults. |
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 | 0.3A higher output current (3A vs. 0.5A), 52 kHz frequency, wider input range (40V vs. 40V), but larger SOIC-16 package and higher quiescent current (10 mA vs. 5 mA). | Supports higher-power loads (e.g., motor drivers, multiple peripherals); less suitable for space-constrained or ultra-low-quiescent designs. | Select LM2576-12 only when >0.5A output is required and PCB area permits SOIC-16 footprint. |
| TPS54202DRCT | 2A synchronous buck, 4.5–28V input, 500 kHz switching, integrated high/low-side FETs, 25 µA shutdown current - but requires external compensation and has no fixed 12V variant. | Delivers higher efficiency at light loads and smaller solution size; demands careful loop compensation and layout for EMI control. | Choose TPS54202DRCT for new designs needing >0.5A, better light-load efficiency, or smaller total footprint - not for drop-in replacement. |
Compared with LM2574MX-12/NOPB, LM2576-12 offers higher current headroom at the cost of larger size and higher idle consumption, while TPS54202DRCT provides modern synchronous efficiency and integration but requires redesign effort and lacks fixed 12V simplicity.
Availability
LM2574MX-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded controller power, and on-card DC/DC conversion requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2574MX-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 support, documentation, and manufacturing continuity for the SIMPLE SWITCHER™ product line.
The LM2574MX-12/NOPB belongs to TI's SIMPLE SWITCHER™ family of easy-to-use, robust switching regulators designed for cost-sensitive, reliability-critical industrial and embedded power applications where minimal external components and proven thermal behavior are essential.
FAQ
What is the maximum input voltage rating for LM2574MX-12/NOPB?
The absolute maximum input voltage for LM2574MX-12/NOPB is 45V, but the recommended maximum operating input voltage is 40V. Exceeding 40V risks violating the guaranteed output voltage tolerance and thermal limits, especially at high ambient temperatures. The LM2574MX-12/NOPB datasheet specifies 40V as the upper bound for guaranteed performance across the full −40°C to +125°C junction temperature range.
Does LM2574MX-12/NOPB require external feedback resistors?
No, LM2574MX-12/NOPB does not require external feedback resistors. It is a fixed-output version with the feedback node internally connected to the 12V output. Pin 5 (FEEDBACK) is a no-connect terminal in this variant - unlike the adjustable LM2574-ADJ, which requires two external resistors to set VOUT. This simplifies layout and eliminates resistor tolerance and drift effects on the LM2574MX-12/NOPB output accuracy.
What package type is used by LM2574MX-12/NOPB?
LM2574MX-12/NOPB uses the 14-lead wide-body surface-mount (WM) package, designated NS package code M14B. It features an exposed thermal pad (Pin 14) connected to GND, which must be soldered to a minimum 1 in² copper area on the PCB to achieve the specified 78 °C/W junction-to-ambient thermal resistance. This package differs from the 8-pin DIP (N08A) and SOIC-8 variants used by other LM2574 versions.
Can LM2574MX-12/NOPB be used in buck-boost (inverting) configuration?
Yes, LM2574MX-12/NOPB can be configured as a positive-to-negative buck-boost converter by re-routing the inductor and diode per standard inverting topology. The internal switch and fixed 12V reference allow precise −12V output when paired with matched external components. However, output ripple and transient response differ from buck mode, and the LM2574MX-12/NOPB datasheet confirms this application in its "Applications" section - no modification to the LM2574MX-12/NOPB itself is required.
What is the typical efficiency of LM2574MX-12/NOPB at full load?
The typical efficiency of LM2574MX-12/NOPB is 88% at VIN = 15V, VOUT = 12V, and IOUT = 0.5A - as measured in the official LM2574 datasheet (DS011394, page 3). Efficiency varies with input voltage and load: it drops to ~77% at VIN = 25V/0.5A and rises slightly at lower loads. This 88% value reflects real silicon performance under defined test conditions, not a theoretical maximum.
LM2574MX-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM2574MX-12/NOPB FAQ
1.How can I place an order for LM2574MX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574MX-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 LM2574MX-12/NOPB reliable?
The price and inventory of LM2574MX-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 LM2574MX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574MX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574MX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574MX-12/NOPB?
LM2574MX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574MX-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 LM2574MX-12/NOPB?
For technical support, including LM2574MX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574MX-12/NOPB requirements.
6.How does Aetrix verify that LM2574MX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574MX-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 LM2574MX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574MX-12/NOPB?
All LM2574MX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574MX-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 LM2574MX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2574MX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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