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Texas Instruments LM2574MX-15
- Part No.:
- LM2574MX-15
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574MX-15.pdf
- Description:
- IC REG BUCK 15V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,677
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Product details
Overview
LM2574MX-15 from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 15V 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 15V rail generation from higher DC inputs.
For engineers reviewing the LM2574MX-15 datasheet, LM2574MX-15 pinout, LM2574MX-15 application, or LM2574MX-15 equivalent, key selection considerations include its 0.5A output capability, 52 kHz fixed-frequency operation, ON/OFF control interface, thermal protection behavior, and compatibility with standard off-the-shelf 330 µH inductors and Schottky catch diodes.
Technical Context
The LM2574MX-15 implements a current-mode buck topology with an integrated NPN power switch, fixed-frequency 52 kHz oscillator, and internal frequency compensation. Its feedback loop uses a precision 1.23V reference to regulate output via external resistor divider (not required for fixed versions).
It operates in continuous conduction mode at full load with typical efficiency of 88% at VIN = 18V and IOUT = 0.5A, and transitions to discontinuous mode under light loads. Protection includes thermal shutdown, peak current limiting (1.0A typical), and TTL-compatible ON/OFF control with 50 µA standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15V ±4% over line/load/temperature - ensures stable rail for analog/digital subsystems without external feedback components. |
| Max Output Current | 0.5A continuous - supports moderate-power microcontrollers, sensors, and interface ICs without external heatsinking. |
| Input Voltage Range | 4.75V to 40V - accommodates wide-input industrial DC sources including 12V, 24V, and 36V battery or bus systems. |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, high-saturation-current inductors (e.g., 330 µH) and simplifies EMI filtering vs. MHz-range converters. |
| Efficiency | 88% at VIN=18V, IOUT=0.5A - reduces power loss and PCB copper trace heating compared to linear regulators. |
| Standby Current | 50 µA typical with ON/OFF pin high - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Protections | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload, short-circuit, or inadequate heatsinking. |
Pinout & Package
LM2574MX-15 is supplied in a 14-lead plastic wide-body surface-mount package (NS M14B, JEDEC MO-153), thermally enhanced with exposed pad for PCB heat transfer. Pin 1 is marked with dot; pins are numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 4.75–40V DC; requires local 22 µF electrolytic bypass capacitor. |
| 2 (GND) | Power Ground | Common return for input/output capacitors, inductor, and catch diode; connects to thermal pad. |
| 3 (OUT) | Switch Node | Drives external inductor; carries pulsed 0.5A current at 52 kHz; connects to cathode of catch diode. |
| 4 (GND) | Power Ground | Second ground connection; ties to same plane as Pin 2 for low-inductance return path. |
| 5 (ON/OFF) | Enable Control Input | TTL-compatible logic input; <1.2V disables regulator (50 µA IQ), >2.2V enables operation. |
| 6 (GND) | Power Ground | Third ground terminal; improves thermal and EMI performance in high-current paths. |
| 7 (GND) | Power Ground | Fourth ground terminal; part of multi-pin ground array for thermal dissipation. |
| 8 (GND) | Power Ground | Fifth ground terminal; connects directly to exposed thermal pad on bottom of package. |
| 9 (GND) | Power Ground | Sixth ground terminal; ensures low-impedance grounding across full package footprint. |
| 10 (GND) | Power Ground | Seventh ground terminal; contributes to θJA = 78°C/W (4-in² copper). |
| 11 (GND) | Power Ground | Eighth ground terminal; critical for minimizing ground bounce in switching node transitions. |
| 12 (GND) | Power Ground | Ninth ground terminal; shares thermal pad connection for uniform heat spreading. |
| 13 (GND) | Power Ground | Tenth ground terminal; completes symmetric ground layout for EMI reduction. |
| 14 (GND) | Power Ground | Eleventh ground terminal; all GND pins must be soldered to large copper area for thermal compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity for dedicated 15V rail applications. |
| Internal 52 kHz oscillator | Removes need for external timing components and enables predictable EMI profile compatible with cost-optimized magnetics. |
| TTL ON/OFF control | Allows system-level power sequencing and low-quiescent-state sleep modes without external level-shifting circuitry. |
| Thermal shutdown + current limit | Provides autonomous fault recovery without external monitoring ICs, supporting robust operation in unattended equipment. |
| Requires only 4 external parts | Minimizes design time and board space: input cap, output cap, inductor, and Schottky catch diode. |
Applications
| Industrial PLC I/O Module Power | Test Equipment Auxiliary Rail |
|---|---|
Use Scenario: Generating isolated 15V supply for analog input conditioning circuits in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V field bus to clean 15V for op-amps and ADC references. Use Value: High efficiency avoids thermal derating in confined enclosures; ±4% tolerance ensures accurate sensor signal scaling. | Use Scenario: Providing stable 15V bias for DUT interface circuitry in automated test equipment with variable load profiles. IC Role / Device Role / Timing Role: On-board switching regulator delivering regulated 15V to relay drivers and signal multiplexers. Use Value: 52 kHz switching enables compact LC filter design; ON/OFF pin allows synchronized power-up/down with test sequence. |
| Medical Diagnostic Sensor Interface | Telecom Line Card Bias Supply |
Use Scenario: Powering low-noise amplifiers and precision DACs in portable ultrasound front-end modules. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding low-dropout linear stages to minimize ripple-induced artifacts. Use Value: 88% efficiency extends battery life; thermal shutdown protects sensitive analog signal chains during fault conditions. | Use Scenario: Delivering 15V to Ethernet PHY transceivers and isolation transformers on telecom line cards with strict thermal budgets. IC Role / Device Role / Timing Role: Compact, surface-mount buck converter replacing bulky linear solutions in space-constrained card layouts. Use Value: 14-pin wide-body package with 11 GND pins ensures low thermal resistance (78°C/W) on standard FR4 PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-15 | 1A output current, 52 kHz, wider input range (up to 40V), higher quiescent current (10 mA vs. 5 mA) | Better suited for higher-load applications; requires larger inductor (100 µH vs. 330 µH) due to higher peak current | Select LM2576-15 when load exceeds 0.5A or when tighter load regulation is required at full scale. |
| TPS54202DRCT | 2A output, 500 kHz switching, integrated MOSFETs, adjustable output, smaller 10-pin WSON package | Enables higher density designs and faster transient response but requires external feedback network and more complex compensation | Choose TPS54202DRCT for space-constrained, high-efficiency designs where adjustable output or higher current is needed. |
Compared with LM2574MX-15, LM2576-15 offers double the output current at identical frequency and footprint compatibility, while TPS54202DRCT delivers higher integration and frequency at the cost of design complexity and loss of fixed-output simplicity.
Availability
LM2574MX-15 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, medical diagnostics, and telecom infrastructure requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2574MX-15 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 legacy SIMPLE SWITCHER™ product lines with full technical documentation and long-term supply commitment.
The LM2574MX-15 belongs to the SIMPLE SWITCHER™ family of monolithic buck regulators designed for ease-of-use in cost-sensitive, medium-power industrial and embedded power conversion applications where reliability and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the LM2574MX-15?
The LM2574MX-15 has an absolute maximum input voltage of 45V and a recommended operating maximum of 40V. Exceeding 40V may reduce reliability or trigger overvoltage stress, especially at elevated temperatures. The device is not rated for the 60V input range supported by the HV variant (LM2574HV-15). Always observe derating guidelines in TI's official datasheet for LM2574MX-15.
Does the LM2574MX-15 require an external feedback resistor network?
No, the LM2574MX-15 does not require external feedback resistors because it is a fixed-output version with internally trimmed 15V regulation. Unlike the adjustable LM2574-ADJ, the LM2574MX-15 integrates the feedback divider, simplifying layout and eliminating resistor tolerance errors. This makes LM2574MX-15 ideal for applications where 15V output stability and design simplicity are priorities.
What inductor value is recommended for the LM2574MX-15 in standard operation?
A 330 µH inductor is the standard recommendation for LM2574MX-15 at 0.5A output and typical input voltages (e.g., 18V–24V). TI's datasheet specifies this value for continuous conduction mode with acceptable ripple and thermal performance. Compatible parts include Pulse Engineering PE-52627 and Renco RL-1284-330-43, both rated for 52 kHz operation and ≥0.75A saturation current.
Can the LM2574MX-15 be used in discontinuous conduction mode?
Yes, the LM2574MX-15 operates reliably in discontinuous conduction mode at light loads (<100 mA), as confirmed in TI's typical performance curves and application notes. In this mode, inductor current falls to zero each cycle, reducing RMS losses and enabling stable regulation down to near-zero load. No design changes are needed - the IC automatically adapts its duty cycle and switching behavior.
What is the thermal resistance (θJA) of the LM2574MX-15 package?
The LM2574MX-15 in its 14-lead wide-body surface-mount package (M14B) has a junction-to-ambient thermal resistance of 78°C/W when mounted on a PCB with 4 square inches of 1 oz. copper. With 1 square inch of copper, θJA rises to 102°C/W. Proper thermal pad soldering and copper pour design are essential to maintain safe junction temperature below 125°C under full 0.5A load.
LM2574MX-15 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:
- Obsolete
- 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):
- 15V
- 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-15 FAQ
1.How can I place an order for LM2574MX-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574MX-15 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-15 reliable?
The price and inventory of LM2574MX-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574MX-15 is usually 5 days.
3.What payment methods are accepted for LM2574MX-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574MX-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574MX-15?
LM2574MX-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574MX-15 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-15?
For technical support, including LM2574MX-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574MX-15 requirements.
6.How does Aetrix verify that LM2574MX-15 is sourced from the original manufacturer or authorized distributors?
All LM2574MX-15 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-15 meets industry standards.
7.What is the process for return or replacement of LM2574MX-15?
All LM2574MX-15 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574MX-15, 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-15 part is unused and in its original packaging.
Return procedure for LM2574MX-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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