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Texas Instruments LM2574HVMX-ADJ/NOPB
- Part No.:
- LM2574HVMX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVMX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,491
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Product details
Overview
LM2574HVMX-ADJ/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with adjustable output, wide 4–60V input range, 52 kHz fixed-frequency oscillator, internal current limiting, and thermal shutdown. It delivers stable DC power in space-constrained industrial power supplies requiring high efficiency over linear regulators.
For engineers reviewing the LM2574HVMX-ADJ/NOPB datasheet, LM2574HVMX-ADJ/NOPB pinout, LM2574HVMX-ADJ/NOPB application, or LM2574HVMX-ADJ/NOPB equivalent, key selection considerations include feedback voltage tolerance (±4%), ON/OFF control interface compatibility, thermal resistance (78 °C/W for M-package), minimum external component count (4), and HV-series input voltage capability up to 60V.
Technical Context
The LM2574HVMX-ADJ/NOPB integrates a PWM controller, power switch, oscillator, and protection circuitry into a single IC. Its internal 52 kHz oscillator drives a N-channel MOSFET switch with cycle-by-cycle current limiting and thermal shutdown-enabling self-protected operation without external sensing components.
Feedback is implemented via a precision 1.23 V reference at the FB pin, allowing output voltage programming from 1.23 V to 57 V using two external resistors. The ON/OFF pin supports TTL-compatible shutdown with 50 µA typical standby current, making it suitable for power sequencing and low-power sleep modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 0.5 A continuous load current-supports mid-power embedded rails without external boost stages. |
| Input Voltage Range | 4 V to 60 V-enables direct regulation from 24 V, 48 V, or automotive battery inputs without pre-regulation. |
| Feedback Voltage | 1.23 V ±4% - sets output accuracy baseline; determines resistor divider ratio for precise programmable outputs. |
| Oscillator Frequency | 52 kHz ±10% - fixed frequency simplifies EMI filtering and inductor selection; avoids audible noise. |
| Efficiency | Up to 88% at 12 VIN/5 VOUT/0.5 A - reduces thermal load vs. linear regulators; PCB copper traces suffice as heatsink. |
| Standby Current | 50 µA typical - enables ultra-low-power shutdown mode for battery-backed or energy-sensitive systems. |
| Thermal Resistance | 78 °C/W (M-package, 4 in² copper) - defines junction-to-ambient rise under full load; guides PCB layout for thermal reliability. |
Pinout & Package
LM2574HVMX-ADJ/NOPB is housed in a 14-pin Wide SOIC (WM) package (NS package code M14B), optimized for surface-mount assembly and thermal performance with exposed pad grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 4–60 V DC; requires local 22 µF electrolytic bypass capacitor near pin for stability. |
| 2 (GND) | Power Ground | Main return path for switch current and control logic; must connect to low-impedance ground plane. |
| 3 (OUT) | Switch Node | Drives external catch diode and inductor; carries high di/dt switching current-requires short, wide trace routing. |
| 4 (FB) | Feedback Input | Senses output voltage via resistor divider; high-impedance (50 nA bias) node sensitive to noise-keep traces short and shielded. |
| 5 (ON/OFF) | Shutdown Control | TTL-compatible enable/disable; <1.0 V = ON, >2.2 V = OFF; draws only 50 µA in shutdown state. |
| 6–14 | No Internal Connection | Thermal pad and unused pins-must be soldered to PCB ground plane for optimal heat dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 1.23 V to 57 V-supports custom rail generation (e.g., 3.3 V, 12 V, 24 V, 48 V) with two precision resistors. |
| Internal Protection | Cycle-by-cycle current limit + thermal shutdown-eliminates need for external fault-handling circuitry in harsh environments. |
| Minimal External Parts | Only 4 components required (inductor, diode, input/output capacitors)-reduces BOM cost and board area vs. controller-based solutions. |
| High-Voltage Input Support | 60 V max input-enables use in industrial 48 V systems, telecom, and automotive applications without external transients suppression. |
| Fixed-Frequency Operation | 52 kHz oscillator-simplifies EMI filter design and avoids interference with audio or communication bands. |
Applications
| Industrial Sensor Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Powering analog sensor front-ends (e.g., pressure, temperature) in factory automation cabinets with 24 V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 3.3 V or 5 V rail from unregulated 24 V supply. Use Value: High efficiency minimizes self-heating in sealed enclosures; 60 V input withstands load-dump transients per ISO 7637-2. | Use Scenario: Providing regulated 5 V for microcontrollers and CAN transceivers in vehicle door modules. IC Role / Device Role / Timing Role: On-board switching regulator replacing inefficient linear LDOs in 12 V battery-fed subsystems. Use Value: 50 µA standby current extends battery life during vehicle sleep mode; thermal shutdown prevents failure during hot-cranking conditions. |
| Programmable Lab Power Supply | POS Terminal DC-DC Conversion |
Use Scenario: Adjustable output stage in benchtop power supplies where users set output between 1.23 V and 30 V. IC Role / Device Role / Timing Role: Core voltage regulation element controlled by digital potentiometer or DAC-driven feedback network. Use Value: Precise 1.23 V reference enables ±4% output accuracy across full adjustment range-critical for calibration-grade instruments. | Use Scenario: Converting 12 V vehicle or wall-adapter input to 5 V/0.5 A for payment terminal logic boards. IC Role / Device Role / Timing Role: Compact, integrated buck converter eliminating need for discrete controller + MOSFET + gate driver. Use Value: 14-pin SOIC package fits tight PCB layouts; fixed 52 kHz frequency allows predictable EMI compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ | 3 A output current, 150 kHz switching frequency, higher quiescent current (5 mA active, 80 µA standby) | Better suited for higher-current loads (>0.5 A); faster switching increases EMI risk and requires tighter layout control | Select when >0.5 A output or smaller inductor size is required; verify thermal margin at full load. |
| MP1584EN-LF-Z | 3 A output, 1.5 MHz switching, integrated high-side MOSFET, no external diode needed | Enables smaller magnetics and lower-profile designs but lacks HV input rating (max 40 V) | Prefer for compact consumer electronics; avoid in 48 V or automotive systems due to 40 V VIN limit. |
Compared with LM2574HVMX-ADJ/NOPB, LM2596S-ADJ offers higher current capacity at the cost of increased complexity and EMI sensitivity, while MP1584EN-LF-Z enables miniaturization but sacrifices high-input-voltage robustness-making LM2574HVMX-ADJ/NOPB optimal for ruggedized 24–48 V industrial conversion where simplicity and fault resilience are prioritized.
Availability
LM2574HVMX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial sensor power supplies, automotive body control modules, programmable lab power supplies, and POS terminal DC-DC conversion requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM2574HVMX-ADJ/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 its legacy analog portfolio, including the SIMPLE SWITCHER™ family. TI is a global leader in analog and embedded processing, serving industrial, automotive, and communications markets.
LM2574HVMX-ADJ/NOPB belongs to the SIMPLE SWITCHER™ buck regulator product line, designed specifically for engineers seeking easy-to-use, highly reliable, and thermally robust DC-DC conversion in cost-sensitive industrial and automotive applications.
FAQ
What is the maximum input voltage supported by LM2574HVMX-ADJ/NOPB?
The LM2574HVMX-ADJ/NOPB supports a maximum input voltage of 60 V, as specified in its Absolute Maximum Ratings and Operating Ratings. This HV designation distinguishes it from the standard LM2574 series (40 V max), enabling direct use with 48 V industrial buses and automotive load-dump tolerant designs. Exceeding 60 V risks permanent damage.
How do I calculate the output voltage for LM2574HVMX-ADJ/NOPB?
The output voltage of LM2574HVMX-ADJ/NOPB is set by a resistor divider between VOUT and GND, connected to the FB pin. Use the formula VOUT = 1.23 V × (1 + R1/R2), where R2 connects FB to GND and R1 connects VOUT to FB. For best accuracy and stability, use 1% metal-film resistors with R1 between 1 kΩ and 5 kΩ.
Does LM2574HVMX-ADJ/NOPB require an external catch diode?
Yes, LM2574HVMX-ADJ/NOPB requires an external Schottky or fast-recovery diode (e.g., MBR150, 11DQ05) connected from the OUT pin to output ground. The diode provides the freewheeling path for inductor current during the switch-off phase. Omitting it will cause catastrophic failure due to voltage spikes and lack of current continuity.
What is the thermal resistance (θJA) of LM2574HVMX-ADJ/NOPB in its actual package?
LM2574HVMX-ADJ/NOPB uses the 14-pin Wide SOIC (M14B) package. Its junction-to-ambient thermal resistance is 78 °C/W when mounted on a PCB with 4 in² of 1 oz. copper surrounding the leads. With only ~1 in² copper, θJA rises to 102 °C/W-so adequate copper pour is essential for reliable 0.5 A operation at elevated ambient temperatures.
Can LM2574HVMX-ADJ/NOPB be synchronized to an external clock?
No, LM2574HVMX-ADJ/NOPB does not support external clock synchronization. Its 52 kHz oscillator is fully internal and fixed-frequency. There is no SYNC pin or frequency-adjust capability. For synchronizable alternatives, consider TI's TPS5430 or newer SIMPLE SWITCHER™ devices like LM5116.
LM2574HVMX-ADJ/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:
- 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/NOPB FAQ
1.How can I place an order for LM2574HVMX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVMX-ADJ/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-ADJ/NOPB reliable?
The price and inventory of LM2574HVMX-ADJ/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-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574HVMX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVMX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVMX-ADJ/NOPB?
LM2574HVMX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVMX-ADJ/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-ADJ/NOPB?
For technical support, including LM2574HVMX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVMX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2574HVMX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574HVMX-ADJ/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-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574HVMX-ADJ/NOPB?
All LM2574HVMX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVMX-ADJ/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-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2574HVMX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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