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Texas Instruments LM2574MX-5.0/NOPB
- Part No.:
- LM2574MX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574MX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,035
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Product details
Overview
LM2574MX-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, ±4% output voltage tolerance over line and load, and integrated thermal shutdown and cycle-by-cycle current limiting. It serves as a high-efficiency replacement for linear regulators in embedded power supplies.
For engineers reviewing the LM2574MX-5.0/NOPB datasheet, LM2574MX-5.0/NOPB pinout, LM2574MX-5.0/NOPB application, or LM2574MX-5.0/NOPB equivalent, this page delivers verified technical context, package-specific pin functions, real-world application constraints, and validated alternative options - all grounded in TI's official LM2574 datasheet (DS011394) and packaging documentation for the SOIC-8 (M package).
Technical Context
The LM2574MX-5.0/NOPB implements a fixed-frequency, current-mode buck topology with an internal NPN switch, feedback comparator, oscillator, and protection circuitry. Its 52 kHz switching frequency enables use of standard off-the-shelf inductors and minimizes EMI compared to higher-frequency alternatives.
It operates in continuous conduction mode (CCM) under typical loads ≥100 mA and transitions to discontinuous conduction mode (DCM) at light loads. Output regulation relies on a resistive feedback network internal to the IC - no external resistor divider is required for the fixed 5.0V version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over −40°C to +125°C, 7V–40V input, 0.1–0.5A load - ensures stable logic rail generation without external adjustment. |
| Max Input Voltage | 40V - supports wide-input industrial and automotive pre-regulation applications without HV variant. |
| Output Current | Guaranteed 0.5A DC - sufficient for powering microcontrollers, sensors, and peripheral ICs directly. |
| Switching Frequency | 52 kHz (±10%) - enables use of low-cost, high-saturation-current inductors (e.g., Pulse PE-52627) and reduces filter component size vs. 25–30 kHz linear regulators. |
| Efficiency | 77% at VIN = 12V, IOUT = 0.5A - significantly reduces thermal load vs. linear regulators; PCB copper acts as primary heatsink. |
| Standby Current | 50 µA typical with ON/OFF pin pulled high - enables low-power system sleep modes without external enable circuitry. |
| Protections | Cycle-by-cycle current limit (1.0A peak), thermal shutdown, and output short-circuit robustness - eliminates need for external fault-handling circuitry. |
Pinout & Package
LM2574MX-5.0/NOPB uses an 8-pin SOIC (Small Outline Integrated Circuit) package, designated by Texas Instruments as package code "M", with 1.27 mm lead pitch and exposed pad not present. Thermal resistance is θJA = 102°C/W (1 in² copper) or 78°C/W (4 in² copper), confirming reliance on PCB copper for heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 7–40V DC; requires ≥22 µF aluminum electrolytic bypass capacitor placed within 5 mm. |
| 2 (GND) | Power Ground | Common return for input capacitor, output capacitor, and catch diode cathode; must connect to single-point ground plane. |
| 3 (OUT) | Switch Node | Drives external catch diode anode and inductor; carries pulsed 0.5A current; layout critical to minimize ringing. |
| 4 (GND) | Power Ground (redundant) | Second ground pin for improved thermal and current handling; must be tied to same ground plane as Pin 2. |
| 5 (ON/OFF) | Enable/Shutdown Control | TTL-compatible; <1.2V disables regulator (50 µA standby); >2.2V enables; open-circuit defaults to ON. |
| 6 (GND) | Power Ground (redundant) | Third ground pin; enhances thermal conduction and reduces ground impedance in high-current paths. |
| 7 (FEEDBACK) | Internal Reference Connection | No connection required for fixed-output versions; internally tied to 5.0V output; must not be externally loaded. |
| 8 (GND) | Power Ground (redundant) | Fourth ground pin; completes low-inductance ground loop for switch node return path. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external resistor divider, reducing BOM count and layout sensitivity while maintaining ±4% accuracy across temperature and load. |
| Integrated current limit & thermal shutdown | Enables self-protecting operation under overload or short-circuit without external sensing or latch circuitry. |
| 52 kHz fixed-frequency oscillator | Allows predictable EMI filtering design and compatibility with low-cost, high-current inductors optimized for this frequency. |
| TTL-compatible ON/OFF control | Supports direct interfacing with microcontroller GPIO pins for power sequencing and system-level energy management. |
| Only 4 external components required | Reduces design time and failure points: input cap, output cap, inductor, and Schottky catch diode (e.g., SR102 or MBR150). |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
|
Use Scenario: Providing regulated 5V rail for digital isolators, CAN transceivers, and microcontrollers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V vehicle or factory bus to clean 5V logic supply. Use Value: 77% efficiency at 0.5A avoids forced-air cooling; 40V max input withstands load-dump transients up to ISO 7637-2 Pulse 1 (−100V/100 ms). |
Use Scenario: Generating 5V for microcontroller, EEPROM, and sensor interface circuits in door modules or lighting controllers. IC Role / Device Role / Timing Role: On-board switching regulator replacing linear LDOs to meet automotive quiescent current requirements. Use Value: 50 µA standby current enables compliance with SAE J1939 sleep-mode limits; SOIC-8 footprint simplifies rework on dense automotive PCBs. |
| Medical Patient Monitor Auxiliary Rail | Point-of-Sale (POS) Terminal Power |
|
Use Scenario: Delivering isolated 5V for display backlight drivers and touch controller ASICs in battery-backed portable monitors. IC Role / Device Role / Timing Role: Secondary-stage buck converter following a 24V-to-12V intermediate rail. Use Value: Thermal shutdown prevents overheating during extended operation in enclosed enclosures; ±4% output tolerance ensures ADC reference stability. |
Use Scenario: Powering 5V USB peripherals, thermal printers, and secure element ICs in retail terminals operating from 12V wall adapters. IC Role / Device Role / Timing Role: High-reliability DC-DC stage ensuring consistent 5V delivery despite adapter ripple and brownout events. Use Value: Cycle-by-cycle current limiting protects against printer motor surge currents; 0.5A rating supports simultaneous USB + printer + display loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-5.0 | DIP-8 package (N package), θJA = 92°C/W (1 in²), no surface-mount footprint; identical electrical specs. | Suitable for prototyping or through-hole production; not compatible with automated SMT assembly. | Select LM2574N-5.0 only when manual soldering or breadboarding is required; LM2574MX-5.0/NOPB is preferred for volume SMT manufacturing. |
| LM2596SX-5.0/NOPB | Higher 3A output current, 150 kHz switching, wider 40V input, but requires different inductor/capacitor values and layout. | Better suited for higher-power applications (>0.5A); introduces higher EMI and more stringent layout rules. | Choose LM2596SX-5.0/NOPB only if future load growth beyond 0.5A is certain; LM2574MX-5.0/NOPB offers optimal cost, size, and simplicity for 0.5A designs. |
Compared with LM2574N-5.0, the LM2574MX-5.0/NOPB provides superior thermal performance in SMT layouts and eliminates through-hole assembly steps; versus LM2596SX-5.0/NOPB, it delivers proven reliability at lower cost and complexity for sub-0.5A applications without sacrificing regulation accuracy or protection features.
Availability
LM2574MX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LM2574MX-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, datasheets, and simulation models for the SIMPLE SWITCHER™ product line.
The LM2574MX-5.0/NOPB belongs to TI's SIMPLE SWITCHER™ family of integrated buck regulators, designed specifically for cost-sensitive, thermally constrained applications where ease of design and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the LM2574MX-5.0/NOPB?
The LM2574MX-5.0/NOPB has an absolute maximum input voltage of 45V, but its recommended operating input voltage range is 7V to 40V. Exceeding 40V may trigger internal protection or reduce reliability; for inputs above 40V, the LM2574HV-5.0 variant (60V max) should be used instead of the standard LM2574MX-5.0/NOPB.
Does the LM2574MX-5.0/NOPB require an external feedback resistor network?
No. The LM2574MX-5.0/NOPB is a fixed-output version with internal feedback circuitry set to 5.0V. The FEEDBACK pin (Pin 7) is internally connected and must remain unconnected - adding external resistors will disrupt regulation and is incompatible with the LM2574MX-5.0/NOPB design.
Can the LM2574MX-5.0/NOPB be used in discontinuous conduction mode (DCM)?
Yes. The LM2574MX-5.0/NOPB naturally transitions into DCM at light loads (<100 mA). Its 52 kHz oscillator and current-mode control ensure stable operation in both continuous and discontinuous modes, making it suitable for variable-load applications like sleep-wake systems without requiring mode-change circuitry.
What type of catch diode is recommended for use with the LM2574MX-5.0/NOPB?
A Schottky diode rated for ≥1A average current and ≥20V reverse voltage is recommended - such as the SR102, MBR150, or 1N5819. These minimize forward voltage drop and switching losses, directly improving efficiency and thermal performance of the LM2574MX-5.0/NOPB circuit.
Is the LM2574MX-5.0/NOPB RoHS compliant and lead-free?
Yes. The /NOPB suffix explicitly indicates "No Lead (Pb)-Free" and RoHS-compliant packaging. The LM2574MX-5.0/NOPB meets EU Directive 2011/65/EU and is manufactured using lead-free solderable terminations and halogen-free molding compound.
LM2574MX-5.0/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):
- 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
LM2574MX-5.0/NOPB FAQ
1.How can I place an order for LM2574MX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574MX-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 LM2574MX-5.0/NOPB reliable?
The price and inventory of LM2574MX-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 LM2574MX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574MX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574MX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574MX-5.0/NOPB?
LM2574MX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574MX-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 LM2574MX-5.0/NOPB?
For technical support, including LM2574MX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574MX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2574MX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574MX-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 LM2574MX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574MX-5.0/NOPB?
All LM2574MX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574MX-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 LM2574MX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2574MX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2574MX-5.0/NOPB Tags
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