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Texas Instruments LM2574HVMX-ADJ
- Part No.:
- LM2574HVMX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVMX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,650
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Product details
Overview
LM2574HVMX-ADJ from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with adjustable output, designed for high-efficiency DC-DC conversion in industrial and embedded power supplies. It delivers ±4% output voltage accuracy over line/load/temperature, supports 4.75–60V input, features internal 52 kHz oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible shutdown with 50 µA standby current - enabling compact, thermally efficient designs in on-card or pre-regulator applications.
For engineers reviewing the LM2574HVMX-ADJ datasheet, LM2574HVMX-ADJ pinout, LM2574HVMX-ADJ application, or LM2574HVMX-ADJ equivalent, key selection criteria include its HV input range (up to 60V), adjustable output (1.23–37V), fixed-frequency operation, minimal external component count (4 parts), and compatibility with standard off-the-shelf inductors - critical for robust, cost-sensitive buck converter implementations.
Technical Context
The LM2574HVMX-ADJ integrates a PWM controller, power switch, oscillator, error amplifier, and protection circuitry into a single IC. Its architecture uses voltage-mode control with internal frequency compensation and a fixed 52 kHz oscillator, eliminating need for external timing components. Feedback is taken from the VFB pin referenced to 1.23V nominal, enabling precise output programming via resistor divider.
It operates in continuous conduction mode by default but transitions gracefully to discontinuous mode at light loads. Protection includes cycle-by-cycle peak current limiting (1.0A typical), thermal shutdown, and under-voltage lockout - all implemented without external sensing elements. The ON/OFF pin provides logic-level enable/disable with 50 µA standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 0.5A DC load capability - sufficient for powering microcontrollers, sensors, and analog front-ends without external boost stages. |
| Input Voltage Range | 4.75V to 60V - supports wide-range industrial inputs (e.g., 24V/48V rails) and automotive battery-supplied systems with transient tolerance. |
| Output Voltage Range | 1.23V to 37V (programmable via external resistors) - enables flexible rail generation including 3.3V, 5V, 12V, 15V, 24V, and custom values. |
| Feedback Reference | 1.230V ±1.3% (min/max over temp) at VFB pin - defines output accuracy baseline; sets output as VOUT = 1.23 × (1 + R2/R1). |
| Switching Frequency | 52 kHz ±10% - fixed internal oscillator enables predictable EMI filtering and eliminates external timing capacitor. |
| Efficiency | Up to 88% (at 12V→5V, 0.5A) - reduces thermal stress and PCB copper area requirements vs. linear regulators. |
| Standby Current | 50 µA typical (ON/OFF pin high) - enables low-power sleep modes in battery-backed or energy-conscious systems. |
Pinout & Package
LM2574HVMX-ADJ is housed in a 14-lead wide-body surface-mount (WM) package (NS package code M14B), optimized for thermal performance with exposed pad for PCB heat sinking. Pin layout matches industry-standard footprint for drop-in compatibility with other Simple Switcher regulators.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power Input | Primary DC input supply connection (4.75–60V); requires local 22 µF bypass capacitor. |
| 2 (GND) | Ground Reference | Power and signal ground return; must be connected to large copper pour for thermal dissipation. |
| 3 (OUT) | Switch Node | Internal NPN switch collector output; connects to inductor and catch diode anode. |
| 4 (FEEDBACK) | Voltage Sense Input | High-impedance (50 nA bias) input for resistor divider; regulates output to 1.23V reference. |
| 5 (ON/OFF) | Enable Control | TTL-compatible digital input; <1.0V disables regulator (50 µA standby), >2.2V enables operation. |
| 6–14 | No Internal Connection / Thermal Pad | Exposed thermal pad (pins 6–14 tied internally) - must be soldered to PCB copper for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switch | Internal 0.9V saturation NPN transistor - eliminates need for external MOSFET driver and reduces BOM count. |
| Fixed-Frequency Oscillator | 52 kHz internal clock - simplifies EMI filter design and avoids audible noise in sensitive audio/power systems. |
| Thermal Shutdown Protection | Activates at ~150°C junction temperature - prevents permanent damage during overload or poor heatsinking. |
| Cycle-by-Cycle Current Limit | 1.0A peak switch current limit - protects against short-circuit and inductor saturation without latch-up. |
| Adjustable Output Architecture | 1.23V precision reference with 50 nA feedback bias - enables stable, accurate outputs from 1.23V to 37V using two resistors. |
Applications
| Industrial Power Supply | Automotive Pre-Regulator |
|---|---|
Use Scenario: On-board 24V-to-5V conversion for PLC I/O modules operating in harsh environments with wide ambient temperature swings (−40°C to +85°C). IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 5V rail for microcontroller, ADC, and communication interfaces. Use Value: High efficiency (77% at 12V→5V/0.5A) minimizes self-heating; 60V max input withstands load-dump transients up to 58V per ISO 7637-2. |
Use Scenario: Pre-regulation stage converting unfiltered 12V vehicle battery (6–16V) to stable 5V before LDO for infotainment MCU. IC Role / Device Role / Timing Role: Efficient intermediate-stage buck converter reducing thermal load on downstream linear regulator. Use Value: 0.5A output supports burst-mode MCU operation; 52 kHz switching avoids AM radio band interference; 50 µA shutdown enables ultra-low quiescent current in sleep mode. |
| Medical Sensor Interface | Telecom Line Card |
Use Scenario: Compact 12V-to-3.3V supply for portable patient monitoring sensor nodes requiring low EMI and long battery life. IC Role / Device Role / Timing Role: Main DC-DC converter powering analog front-end, low-power MCU, and BLE radio subsystem. Use Value: Adjustable output allows precise 3.3V setting; ±4% output tolerance ensures ADC reference stability; minimal external parts reduce board area and assembly cost. |
Use Scenario: Distributed 48V-to-12V conversion on telecom line cards where space and thermal density are constrained. IC Role / Device Role / Timing Role: High-input-voltage buck regulator delivering 12V to FPGAs, PHYs, and interface ICs. Use Value: 60V absolute max input rating accommodates 48V system surges; 14-pin WM package offers better thermal resistance (θJA = 78°C/W with 4 in² copper) than DIP alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HV-ADJ | Higher 3A output current, 52 kHz frequency, wider 4–60V input, but larger SO-8 package and higher quiescent current (10 mA active). | Supports higher-power loads (e.g., motor drivers, multi-rail systems); less suitable for space-constrained 0.5A designs. | Select LM2576HV-ADJ only when >0.5A output or higher thermal margin is required; LM2574HVMX-ADJ remains optimal for cost- and size-sensitive 0.5A applications. |
| MP1584EN-LF-Z | 40V max input, 3A output, 1.5 MHz switching, smaller SO-8 package, but requires external compensation and lacks integrated thermal shutdown. | Better for compact, high-frequency designs needing low output ripple; unsuitable for 48V+ inputs or designs requiring guaranteed fault protection. | Choose MP1584EN-LF-Z for high-density boards with tight EMI filters; LM2574HVMX-ADJ preferred where 60V input, integrated protection, and proven reliability are mandatory. |
Compared with LM2576HV-ADJ and MP1584EN-LF-Z, LM2574HVMX-ADJ uniquely balances 60V input capability, integrated protection, minimal external parts, and thermal robustness in a 14-pin WM package - making it the most suitable choice for industrial and automotive 0.5A buck applications demanding simplicity and field reliability.
Availability
LM2574HVMX-ADJ is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LM2574HVMX-ADJ 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 family.
The LM2574HVMX-ADJ belongs to TI's SIMPLE SWITCHER™ buck regulator series, engineered specifically for ease-of-use, high reliability, and minimal external component count in industrial and automotive power conversion applications.
FAQ
What is the maximum input voltage rating for LM2574HVMX-ADJ?
The LM2574HVMX-ADJ has an absolute maximum input voltage of 63V and a recommended operating maximum of 60V. This high-voltage rating enables use in 48V industrial systems and automotive applications where load-dump transients occur. Operation above 60V risks permanent damage, and the device includes internal overvoltage protection that clamps at approximately 63V.
How do I calculate the output voltage for LM2574HVMX-ADJ?
The output voltage of LM2574HVMX-ADJ is set by a resistor divider between VOUT and GND, with the midpoint connected to the FEEDBACK (FB) pin. Use the formula VOUT = 1.23 × (1 + R2/R1), where R1 connects FB to GND and R2 connects VOUT to FB. For example, R1 = 1.0 kΩ and R2 = 18.7 kΩ yields VOUT ≈ 24.2V. The FB pin draws only 50 nA, minimizing divider current error.
Does LM2574HVMX-ADJ require an external diode, and what type is recommended?
Yes, LM2574HVMX-ADJ requires an external Schottky catch diode connected from the OUT pin to GND. Recommended parts include MBR150 (50V, 1A), 11DQ05 (50V, 1A), or SR105 (50V, 1A). The diode must withstand ≥1.25× maximum input voltage and carry ≥1.5× maximum load current (0.75A min for 0.5A output) to ensure reliability during overload or short-circuit conditions.
What is the thermal performance of LM2574HVMX-ADJ in its 14-pin WM package?
In the 14-pin wide-body surface-mount (WM) package, LM2574HVMX-ADJ achieves θJA = 78°C/W with 4 in² of 1 oz. copper on the PCB - significantly better than the 102°C/W of the same package with minimal copper. The exposed thermal pad (pins 6–14) must be soldered to a solid copper pour. Junction temperature must remain ≤125°C for continuous operation, and thermal shutdown activates at ~150°C.
Can LM2574HVMX-ADJ be used in discontinuous conduction mode (DCM)?
Yes, LM2574HVMX-ADJ operates naturally in both continuous and discontinuous conduction modes. At light loads (<~100 mA), inductor current falls to zero each cycle, entering DCM - which is fully supported and does not affect regulation or reliability. DCM reduces switching losses and improves light-load efficiency, though output ripple may increase slightly. No external circuit changes are needed to accommodate DCM operation.
LM2574HVMX-ADJ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- 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-ADJ FAQ
1.How can I place an order for LM2574HVMX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVMX-ADJ 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-ADJ reliable?
The price and inventory of LM2574HVMX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVMX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2574HVMX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVMX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVMX-ADJ?
LM2574HVMX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVMX-ADJ 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-ADJ?
For technical support, including LM2574HVMX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVMX-ADJ requirements.
6.How does Aetrix verify that LM2574HVMX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2574HVMX-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LM2574HVMX-ADJ?
All LM2574HVMX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVMX-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LM2574HVMX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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