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Texas Instruments LM2574HVMX-12/NOPB
- Part No.:
- LM2574HVMX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVMX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,276
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Product details
Overview
LM2574HVMX-12/NOPB from Texas Instruments is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 12V output, 60V maximum input voltage, 52 kHz fixed-frequency oscillator, ±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 wide-input sources.
For engineers reviewing the LM2574HVMX-12/NOPB datasheet, LM2574HVMX-12/NOPB pinout, LM2574HVMX-12/NOPB application, or LM2574HVMX-12/NOPB equivalent, key selection criteria include input voltage range up to 60V, guaranteed 0.5A output current, minimal external component count (4 parts), TTL-compatible shutdown, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2574HVMX-12/NOPB implements a fixed-frequency PWM buck topology with internal oscillator, error amplifier, and NPN power switch. Its control loop uses voltage-mode feedback referenced to an internal 1.23V bandgap, with no external compensation required due to built-in frequency compensation.
It operates in continuous conduction mode under typical loads ≥100 mA and transitions to discontinuous mode at light loads. Protection features include thermal shutdown triggered at 150°C junction temperature and peak current limiting set at 0.65–1.8 A depending on operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for microcontrollers and analog circuitry without trimming. |
| Max Input Voltage | 60 V - supports direct connection to unregulated 48V telecom or industrial bus rails without pre-regulation. |
| Output Current | Guaranteed 0.5 A - sufficient to power multiple ICs or small peripherals without derating at 125°C ambient. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current toroidal or bobbin-core inductors with minimal EMI filtering. |
| Efficiency | 88% at VIN = 15 V, IOUT = 0.5 A - reduces thermal load on PCB; copper traces serve as sole heatsink in most layouts. |
| Shutdown Current | 50 µA typical - allows low-power standby operation in battery-backed or energy-sensitive systems. |
| Thermal Resistance | 78 °C/W (θJA, M package with 4 in² copper) - defines safe power dissipation limit of ~1.3 W at 125°C junction. |
Pinout & Package
LM2574HVMX-12/NOPB is housed in a 14-pin Wide SOIC (WM) package (NS package code M14B), with exposed pad for enhanced thermal performance. Pin 1 is marked by notch or dot; pins are numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply | Accepts 4.75–60 V DC; requires local 22 µF electrolytic bypass capacitor. |
| 2 (GND) | Power ground | Common return for input cap, output cap, and catch diode; must connect to thermal pad. |
| 3 (OUT) | Switch node | Drives external catch diode anode and inductor; carries pulsed 0.5A current with fast edges. |
| 4 (FEEDBACK) | Voltage sense | Not connected for fixed-output version; internally tied to 12V divider - no external resistors needed. |
| 5 (ON/OFF) | Enable control | TTL-compatible shutdown: <0.8 V = ON, >2.4 V = OFF; draws ≤30 µA in shutdown. |
| 6–14 | No internal connection | Unused pins; recommended to solder to PCB ground plane for thermal and EMI improvement. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12V output | Eliminates external feedback resistor network - reduces BOM count and layout sensitivity. |
| 60V input rating | Enables single-stage conversion from 48V industrial or PoE-derived supplies without front-end buck or Zener clamp. |
| 52 kHz switching | Permits use of low-DCR, high-current inductors with minimal core loss - avoids audible noise and simplifies EMI filter design. |
| Internal compensation | Removes need for external compensation components - accelerates design cycle and improves stability across manufacturing variance. |
| TTL shutdown | Allows clean system-level power sequencing via microcontroller GPIO without level-shifting circuitry. |
Applications
| Industrial Sensor Node Power | 48V-to-12V Telecom Pre-regulator |
|---|---|
Use Scenario: Powering 12V analog sensors, signal conditioners, and RS-485 transceivers in remote field devices powered from 24–60V DC distribution lines. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC converter providing regulated 12V rail with high line regulation (±0.2%) and low output ripple (<100 mVpp). Use Value: Enables compact, fanless enclosure design with only PCB copper as heatsink - eliminates need for heatsinks or forced air. | Use Scenario: Generating stable 12V intermediate bus from nominal 48V telecom supply before LDO post-regulation to 3.3V/1.8V logic rails. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing thermal stress on downstream LDOs and improving overall system efficiency by >35% vs. linear solution. Use Value: Achieves 88% efficiency at 0.5A load - cuts power loss from 2.4W (linear) to 0.3W, enabling higher density board layouts. |
| Ruggedized Embedded Controller Supply | Positive-to-Negative Buck-Boost Converter |
Use Scenario: Providing 12V power to ARM Cortex-M based controllers in automotive body electronics exposed to load dump transients up to 60V. IC Role / Device Role / Timing Role: Input-robust primary regulator with built-in thermal and overcurrent protection - survives ISO 7637-2 Pulse 5a without external TVS. Use Value: Guarantees operation across −40°C to +125°C junction temperature - eliminates cold-start failures and thermal shutdown during sustained load. | Use Scenario: Generating −12V rail from +12V source for op-amp biasing or analog front-end circuits using inverting buck-boost topology. IC Role / Device Role / Timing Role: Reconfigured as inverting regulator via standard application circuit (Figure 2, DS011394); maintains same 52 kHz switching and protection features. Use Value: Delivers −12V @ 0.3A with <5% regulation error - avoids need for dedicated inverting IC or transformer-based solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVS-12 | 1A output current, 52 kHz, wider input range (60V), but larger SOIC-16 package and higher quiescent current (10 mA vs. 5 mA). | Preferred where higher output current or tighter load regulation is required; less suitable for space-constrained 14-pin footprints. | Select when >0.5A load margin is needed; verify PCB layout accommodates larger thermal pad and pin spacing. |
| TPS54202DR | 2A synchronous buck, 4.5–28V input, 500 kHz switching, integrated MOSFETs - no external diode required; lower efficiency at 60V input due to max VIN limit. | Better for low-input-voltage, high-density designs; incompatible with >28V inputs - cannot replace LM2574HVMX-12/NOPB in 48V+ systems. | Choose for new designs below 28V input; avoid for legacy 48V/60V industrial upgrades requiring drop-in compatibility. |
Compared with LM2576HVS-12 and TPS54202DR, the LM2574HVMX-12/NOPB offers optimal balance of 60V input capability, 14-pin SOIC footprint, and proven reliability in harsh environments - making it preferred for retrofitting or cost-sensitive industrial power stages where 0.5A suffices.
Availability
LM2574HVMX-12/NOPB is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and embedded controller applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2574HVMX-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 LM2574HVMX-12/NOPB belongs to TI's SIMPLE SWITCHER™ family of integrated buck regulators, designed specifically for ease-of-use, minimal external component count, and robust operation in industrial and automotive power systems.
FAQ
What is the maximum input voltage rating for the LM2574HVMX-12/NOPB?
The LM2574HVMX-12/NOPB has a maximum input voltage rating of 60 V, as specified in its Absolute Maximum Ratings table. This HV (High Voltage) variant is distinct from the standard LM2574 series (max 45 V). The 60 V rating allows direct operation from 48 V telecom buses or industrial 24–60 V DC lines without input clamping or pre-regulation. Exceeding 60 V risks permanent damage per datasheet Note 1.
Does the LM2574HVMX-12/NOPB require external feedback resistors?
No, the LM2574HVMX-12/NOPB does not require external feedback resistors. As a fixed-output version, its internal resistor divider is factory-trimmed to deliver 12 V ±4% across temperature and load. Pin 4 (FEEDBACK) is internally connected and must remain unconnected on the PCB - unlike the adjustable LM2574HV-ADJ variant which requires external R1/R2.
What package type is used for the LM2574HVMX-12/NOPB?
The LM2574HVMX-12/NOPB uses a 14-pin Wide SOIC (WM) package, also designated NS package code M14B. It features an exposed thermal pad on the underside for improved heat transfer to the PCB. This differs from the 8-pin DIP (N08A) and 16-pin SOIC (M16A) variants - correct footprint selection is critical for thermal performance and manufacturability.
Can the LM2574HVMX-12/NOPB be used in a negative-output configuration?
Yes, the LM2574HVMX-12/NOPB can be configured as a negative-output (buck-boost) converter per Figure 2 in the official datasheet (DS011394). In this topology, the IC generates −12 V from a positive input by repositioning the inductor and diode. Output current capability drops to ~0.3 A due to duty-cycle and diode losses, and regulation accuracy degrades slightly versus the standard buck configuration.
What is the typical efficiency of the LM2574HVMX-12/NOPB at full load?
The LM2574HVMX-12/NOPB achieves 88% typical efficiency at VIN = 15 V, VOUT = 12 V, and IOUT = 0.5 A, as measured per the "LM2574-12, LM2574HV-12" Electrical Characteristics table. Efficiency varies with input voltage - e.g., 77% at VIN = 25 V - due to increased switching and conduction losses. Full-load efficiency remains ≥85% across the recommended 15–40 V input range.
LM2574HVMX-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):
- 60V
- 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
LM2574HVMX-12/NOPB FAQ
1.How can I place an order for LM2574HVMX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVMX-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 LM2574HVMX-12/NOPB reliable?
The price and inventory of LM2574HVMX-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 LM2574HVMX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574HVMX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVMX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVMX-12/NOPB?
LM2574HVMX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVMX-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 LM2574HVMX-12/NOPB?
For technical support, including LM2574HVMX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVMX-12/NOPB requirements.
6.How does Aetrix verify that LM2574HVMX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574HVMX-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 LM2574HVMX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574HVMX-12/NOPB?
All LM2574HVMX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVMX-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 LM2574HVMX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2574HVMX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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