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Texas Instruments LM2574M-5.0/NOPB
- Part No.:
- LM2574M-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574M-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,868
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Product details
Overview
LM2574M-5.0/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 5.0V output, 52 kHz internal oscillator, 40V maximum input voltage, and integrated cycle-by-cycle current limiting and thermal shutdown. It replaces linear regulators in medium-power DC-DC conversion applications such as industrial control power supplies and embedded system rails.
For engineers reviewing the LM2574M-5.0/NOPB datasheet, LM2574M-5.0/NOPB pinout, LM2574M-5.0/NOPB application, or LM2574M-5.0/NOPB equivalent, key selection considerations include guaranteed ±4% output voltage tolerance over line/load/temperature, 77% typical efficiency at 12VIN/0.5A, TTL-compatible shutdown with 50 µA standby current, and compatibility with standard off-the-shelf 330 µH inductors.
Technical Context
The LM2574M-5.0/NOPB implements a fixed-frequency, current-mode buck topology with an internal NPN switch, feedback comparator, and oscillator. Its 52 kHz switching frequency enables use of low-cost, high-saturation-current inductors while maintaining manageable EMI and PCB layout constraints.
Control is achieved via internal voltage feedback referencing the 5.0V output directly-no external resistors required-and shutdown is asserted by pulling the ON/OFF pin below 1.2V (max), enabling precise power sequencing and low-quiescent-power sleep states without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over −40°C to +125°C, 7V–40V input, 0.1A–0.5A load - ensures stable microcontroller core rail under varying conditions. |
| Max Output Current | 0.5A continuous - supports moderate-power peripherals like sensors, UART transceivers, and small displays. |
| Input Voltage Range | 4V to 40V - accommodates 5V, 12V, and 24V industrial bus inputs without pre-regulation. |
| Switching Frequency | 52 kHz (±10%) - enables use of low-ESR aluminum electrolytic capacitors and standard 330 µH inductors (e.g., Pulse PE-52627). |
| Efficiency | 77% typical at VIN = 12V, IOUT = 0.5A - reduces thermal load vs. linear regulators; PCB copper acts as sole heatsink. |
| Shutdown Current | 50 µA typical - allows battery-backed systems to maintain >1-year shelf life with active power gating. |
| Thermal Protection | Internal thermal shutdown - prevents damage during sustained overload or poor airflow; auto-recovery on cooldown. |
Pinout & Package
LM2574M-5.0/NOPB is housed in a 14-pin wide-body surface-mount package (NS M14B, JEDEC MS-013AC), optimized for thermal performance with exposed pad soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 4–40V unregulated DC; requires ≥22 µF local aluminum electrolytic bypass. |
| 2 (GND) | Power Ground | Main return path for switch current and feedback; must connect to large copper pour for thermal conduction. |
| 3 (OUT) | Switch Node | Drives external catch diode and inductor; high dI/dt node requiring short, low-inductance routing. |
| 4 (GND) | Power Ground | Dedicated ground pin adjacent to OUT to minimize switching loop area and EMI. |
| 5 (ON/OFF) | Enable Control | TTL-compatible shutdown: <1.2V = OFF (50 µA IQ), >2.2V = ON; open-circuit defaults to ON. |
| 6 (GND) | Power Ground | Third ground pin for improved grounding integrity in high-noise environments. |
| 7 (FEEDBACK) | Output Sense | Internally tied to 5.0V output; not accessible - no external resistor network required. |
| 8 (GND) | Power Ground | Fourth ground pin supporting low-impedance return for internal bias circuitry. |
| 9–14 (GND) | Power Ground / Thermal Pad | All remaining pins are internally connected to GND and thermally linked to exposed pad for enhanced heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V Output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% regulation across temperature and load. |
| Integrated Current Limit | Cycle-by-cycle peak current limiting at ~1.0A protects against short-circuit faults without external sensing components. |
| Thermal Shutdown | Automatically disables switching when junction temperature exceeds ~150°C, preventing permanent damage during thermal overload. |
| Low Standby Current | 50 µA typical shutdown current enables long-term battery operation in always-on monitoring systems. |
| Simple External Design | Requires only four components: input cap, output cap, inductor, and Schottky catch diode - accelerates prototyping and reduces layout risk. |
Applications
| Industrial Sensor Node Power | Embedded Controller Pre-regulator |
|---|---|
Use Scenario: Powering a 32-bit ARM Cortex-M4 microcontroller, RS-485 transceiver, and analog sensor front-end from a 24V factory bus. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering regulated rail to MCU VDD, peripheral I/O, and ADC reference. Use Value: Delivers 0.5A at 77% efficiency, eliminating need for heatsinks and enabling compact 2-layer PCB design with minimal thermal derating. | Use Scenario: Generating 5V intermediate rail to feed a low-noise LDO (e.g., TPS7A47) powering precision analog circuitry. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping 12V down to 5V before final linear regulation. Use Value: Reduces LDO power dissipation by >60% vs. direct 12V-to-3.3V linear conversion, improving overall system thermal margin. |
| On-Board DC-DC Conversion | Positive-to-Negative Buck-Boost |
Use Scenario: Replacing 7805 linear regulators on legacy industrial PCBs where board space and thermal management are constrained. IC Role / Device Role / Timing Role: Drop-in buck replacement providing same 5V output but with 3× higher efficiency and lower operating temperature. Use Value: Enables reuse of existing 5V footprint and connector while cutting board-level power loss from ~2.5W to <1W at 0.5A load. | Use Scenario: Generating −5V rail from a 12V supply for op-amp biasing in signal conditioning circuits. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using same external components as standard buck. Use Value: Achieves regulated −5V output without dedicated inverting IC, leveraging existing LM2574M-5.0/NOPB inventory and layout patterns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-5.0 | 0.5A output, 52 kHz, but uses PNP switch → higher dropout and lower efficiency (~72% at 12V/0.5A). | Limited to ≤35V input; less suitable for 24V industrial bus with ripple margin. | Prefer LM2574M-5.0/NOPB for higher input voltage range and NPN-switch efficiency. |
| TPS54202DR | 2A synchronous buck, 4.5–28V input, 500 kHz, integrated FETs - no external diode required. | Higher cost and complexity; requires careful layout for EMI control at higher frequency. | Select TPS54202DR only when >0.5A output or tighter size constraints justify redesign effort. |
Compared with LM2575-5.0, LM2574M-5.0/NOPB offers superior efficiency and 40V input rating; compared with TPS54202DR, it trades higher integration for lower BOM cost, simpler layout, and proven reliability in legacy industrial designs.
Availability
LM2574M-5.0/NOPB is available at Aetrix Electronics and suitable for industrial automation power supplies, embedded controller auxiliary rails, and sensor node DC-DC conversion requiring stable component supply across extended product lifecycles.
Supply support for LM2574M-5.0/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 and manufacturing continuity for the SIMPLE SWITCHER™ portfolio.
The LM2574 series was designed specifically for cost-sensitive, medium-power industrial and embedded applications where simplicity, reliability, and thermal robustness outweigh the need for ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2574M-5.0/NOPB?
The LM2574M-5.0/NOPB has an absolute maximum input voltage of 45V and a recommended maximum operating input voltage of 40V. Exceeding 40V may trigger internal protection or reduce long-term reliability, especially at elevated temperatures. Always observe the 40V limit in continuous operation per the datasheet's Operating Ratings table.
Does LM2574M-5.0/NOPB require external feedback resistors to set the output voltage?
No. The LM2574M-5.0/NOPB is a fixed-output variant with internal feedback network configured for 5.0V. Pin 7 (FEEDBACK) is internally connected to the regulated output and is not accessible for external adjustment - no resistors are needed, simplifying layout and improving stability.
Can LM2574M-5.0/NOPB be used in an inverting buck-boost configuration?
Yes. The LM2574M-5.0/NOPB supports inverting buck-boost topology to generate negative output voltages. When configured per Figure 11 in the datasheet, it delivers a well-regulated −5V output from a positive input, using the same inductor and capacitor values as the standard buck circuit.
What thermal performance can be expected from LM2574M-5.0/NOPB in a standard PCB layout?
In a standard 2-layer PCB with 1 in² of 1 oz. copper connected to the exposed thermal pad, LM2574M-5.0/NOPB exhibits θJA = 102°C/W. At 0.5A output and 12V input, junction temperature rise is ~39°C above ambient - well within the −40°C to +125°C operating range without forced air or additional heatsinking.
Is LM2574M-5.0/NOPB RoHS compliant and lead-free?
Yes. The /NOPB suffix explicitly denotes "No Lead (Pb)-Free" and RoHS-compliant packaging. LM2574M-5.0/NOPB meets EU RoHS Directive 2011/65/EU and is manufactured with lead-free terminations and halogen-free molding compound.
LM2574M-5.0/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):
- 5V
- 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-5.0/NOPB FAQ
1.How can I place an order for LM2574M-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574M-5.0/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-5.0/NOPB reliable?
The price and inventory of LM2574M-5.0/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-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574M-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574M-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574M-5.0/NOPB?
LM2574M-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574M-5.0/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-5.0/NOPB?
For technical support, including LM2574M-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574M-5.0/NOPB requirements.
6.How does Aetrix verify that LM2574M-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574M-5.0/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-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574M-5.0/NOPB?
All LM2574M-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574M-5.0/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-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2574M-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2574M-5.0/NOPB Tags
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