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Texas Instruments LM2574HVM-ADJ
- Part No.:
- LM2574HVM-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVM-ADJ.pdf
- Description:
- IC REG BUCK ADJ 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
LM2574HVM-ADJ from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching regulator IC with adjustable output voltage (1.23V to 37V), 52 kHz fixed-frequency oscillator, and wide 4–60V input range. It integrates internal current limiting, thermal shutdown, and TTL-compatible shutdown control, and is used in on-card DC/DC conversion for industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2574HVM-ADJ datasheet, LM2574HVM-ADJ pinout, LM2574HVM-ADJ application, or LM2574HVM-ADJ equivalent, key selection considerations include its HV-rated 60V max input, ±4% feedback voltage tolerance, 50 µA standby current, 0.5A guaranteed output, and compatibility with standard off-the-shelf inductors - all critical for robust buck converter design in space-constrained embedded systems.
Technical Context
The LM2574HVM-ADJ implements a fixed-frequency, current-mode buck topology with an integrated NPN switch, cycle-by-cycle peak current limiting, and internal frequency compensation. Its feedback pin monitors a resistor-divider network to regulate output voltage precisely via a 1.23V reference.
It operates across −40°C to +125°C junction temperature, supports discontinuous and continuous conduction modes, and features a dedicated ON/OFF pin enabling logic-level shutdown with 50 µA typical quiescent current - making it suitable for battery-backed or low-power standby applications where thermal management and supply sequencing matter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 0.5A continuous load capability - sufficient for powering microcontrollers, sensors, and interface ICs without external current boosting. |
| Input Voltage Range | 4V to 60V - enables direct operation from unregulated 24V/48V industrial rails or automotive battery inputs with transient headroom. |
| Output Voltage Range | Adjustable from 1.23V to 37V using external resistors - supports custom rail generation (e.g., 3.3V, 5V, 12V, 24V) without changing IC. |
| Feedback Reference | 1.23V ±4% over line/load/temperature - defines regulation accuracy and sets minimum output voltage in adjustable configuration. |
| Switching Frequency | 52 kHz fixed (±10%) - balances EMI, inductor size, and efficiency; allows use of low-cost, high-saturation-current toroidal or bobbin-core inductors. |
| Standby Current | 50 µA typical at shutdown - minimizes system-level leakage during sleep mode in portable or energy-sensitive designs. |
| Thermal Resistance | 78 °C/W (junction-to-ambient, M package with 4 in² copper) - enables full 0.5A output without heatsink under typical PCB layout conditions. |
Pinout & Package
LM2574HVM-ADJ is supplied in a 14-lead wide surface-mount (WM) package (NS package code M14B), thermally enhanced for high-power density mounting on standard FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 4–60V unregulated DC; requires local 22 µF electrolytic bypass capacitor for stability. |
| 2 (GND) | Power Ground | Primary return path for input capacitor, catch diode, and inductor; must be connected to low-impedance ground plane. |
| 3 (OUT) | Switch Node | Drives external inductor and catch diode; carries high di/dt switching current - trace routing critical for EMI control. |
| 4 (FEEDBACK) | Voltage Sense Input | Monitors resistor divider from output; 50 nA bias current enables high-impedance programming (e.g., R1 = 1 kΩ, R2 = 18.7 kΩ for 24V). |
| 5 (ON/OFF) | Shutdown Control | TTL-compatible enable pin: <1.0 V = ON, >2.2 V = OFF; draws only 12 µA when active, 50 µA in shutdown. |
| 6–14 | No Internal Connection | Thermal pads (pins 6–14) are electrically isolated but soldered to PCB copper for heat dissipation - required for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload, short-circuit, or ambient temperature rise. |
| High Efficiency | Up to 88% efficiency (e.g., 15V→12V @ 0.5A) reduces heat generation and eliminates need for external heatsinks in most applications. |
| Minimal External Parts | Only four components required: inductor, catch diode, input capacitor, output capacitor - accelerates design and lowers BOM cost. |
| HV Input Rating | 60V absolute maximum input supports 48V industrial systems and automotive cold-crank (up to 65V transients with margin). |
| Standard Inductor Compatibility | Optimized for widely available 52 kHz-rated inductors (e.g., Pulse PE-52627, Renco RL-1284-330) - avoids custom magnetics procurement delays. |
Applications
| Industrial Power Supplies | Embedded System Pre-regulation |
|---|---|
Use Scenario: Generating stable 5V or 12V rails from noisy 24V factory bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC power with built-in fault protection. Use Value: Eliminates linear pre-regulator losses while maintaining ±4% output accuracy across 40–60V input variation and 0–0.5A load range. | Use Scenario: Supplying clean 3.3V to ARM Cortex-M microcontrollers and SPI peripherals in space-constrained edge devices. IC Role / Device Role / Timing Role: Efficient intermediate-stage converter stepping down 12V board rail before LDO post-regulation. Use Value: Reduces thermal load on downstream LDOs and extends battery life in always-on monitoring nodes via 50 µA shutdown current. |
| On-Card DC/DC Conversion | Positive-to-Negative Buck-Boost |
Use Scenario: Local 15V generation on motor drive control boards where centralized 48V distribution is used. IC Role / Device Role / Timing Role: Standalone switching regulator mounted directly adjacent to load to minimize IR drop and noise coupling. Use Value: Achieves <100 mVpp output ripple with standard 220 µF aluminum electrolytic capacitor - meets MCU ADC reference stability requirements. | Use Scenario: Creating −12V bias for op-amp signal conditioning stages from existing +24V supply in test equipment. IC Role / Device Role / Timing Role: Configured in inverting buck-boost topology using same external components as buck mode. Use Value: Leverages identical IC and inductor footprint to generate negative rails without adding dedicated inverting controller ICs or transformers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVS-ADJ | Higher 3A output current, 52 kHz frequency, wider 4–60V input, but larger SOIC-16 package and higher quiescent current (10 mA vs. 5 mA active). | Better suited for higher-power loads (>0.5A); less optimal for ultra-low-quiescent or space-constrained layouts. | Select LM2576HVS-ADJ only if ≥1.5A output or improved transient response under heavy load is required. |
| MP1584EN-LF-Z | 3A output, 1.5 MHz switching, smaller SOT-23-8 package, but lower 28V max input and no HV rating - not suitable for 48V+ systems. | Preferred for compact consumer electronics with ≤24V inputs; lacks the 60V ruggedness needed for industrial environments. | Choose MP1584EN-LF-Z for cost-sensitive, high-density 12V-input applications where size outweighs input voltage range. |
Compared with LM2576HVS-ADJ and MP1584EN-LF-Z, the LM2574HVM-ADJ uniquely balances 60V HV operation, 0.5A capability, thermal efficiency, and proven reliability in harsh environments - making it the optimal choice for industrial buck conversion where input voltage margin and long-term stability are prioritized over raw current or switching speed.
Availability
LM2574HVM-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulation, on-card DC/DC conversion, and positive-to-negative buck-boost applications requiring stable component supply, long-lifecycle support, and consistent electrical performance across temperature extremes.
Supply support for LM2574HVM-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 and manufacturing continuity for the SIMPLE SWITCHER™ product family.
The LM2574HVM-ADJ belongs to TI's SIMPLE SWITCHER™ buck regulator series, designed specifically for engineers needing robust, easy-to-use, high-voltage DC/DC conversion with minimal external components and proven field reliability in industrial and automotive environments.
FAQ
What is the maximum input voltage rating for the LM2574HVM-ADJ?
The LM2574HVM-ADJ has an absolute maximum input voltage rating of 63V and a recommended operating maximum of 60V. This HV rating distinguishes it from the standard LM2574 (40V max) and enables reliable operation in 48V industrial systems, automotive battery-connected circuits, and applications subject to load-dump transients - provided external components (e.g., input capacitor, catch diode) are similarly rated.
How do I set the output voltage for the LM2574HVM-ADJ?
The LM2574HVM-ADJ output voltage is set using two external resistors (R1 and R2) connected between output, feedback (pin 4), and ground. The formula is VOUT = 1.23V × (1 + R2/R1), with R1 typically 1–5 kΩ. For example, R1 = 1 kΩ and R2 = 18.7 kΩ yields 24V output. The LM2574HVM-ADJ feedback pin draws only 50 nA, allowing high-value resistors to minimize divider current without affecting accuracy.
Does the LM2574HVM-ADJ require an external diode, and what type is recommended?
Yes, the LM2574HVM-ADJ requires an external Schottky catch diode connected from the OUT pin (pin 3) to GND. Recommended parts include MBR150 (50V, 1A), 11DQ05, or SR105 - selected for low forward voltage (<0.55V), fast recovery, and ≥1.25× VIN(max) reverse voltage rating. A 1A diode suffices for the LM2574HVM-ADJ's 0.5A output, but higher current ratings improve reliability under surge conditions.
What is the purpose of pins 6 through 14 on the LM2574HVM-ADJ package?
Pins 6 through 14 on the LM2574HVM-ADJ are thermal pads with no internal electrical connection. They must be soldered to a large copper area on the PCB to provide effective heat transfer from the die to the board. This thermal anchoring is essential to achieve the specified 78 °C/W junction-to-ambient thermal resistance and sustain 0.5A output current without exceeding 125°C junction temperature.
Can the LM2574HVM-ADJ be used in discontinuous conduction mode (DCM)?
Yes, the LM2574HVM-ADJ operates reliably in both continuous and discontinuous conduction modes. DCM occurs naturally at light loads (e.g., <100 mA) and is fully supported - the IC maintains regulation, reduces switching losses, and exhibits predictable transient behavior. Designers may intentionally select smaller inductors (e.g., 68 µH instead of 330 µH) to force DCM for size reduction, though output ripple and light-load efficiency trade-offs must be verified per application.
LM2574HVM-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
LM2574HVM-ADJ FAQ
1.How can I place an order for LM2574HVM-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVM-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 LM2574HVM-ADJ reliable?
The price and inventory of LM2574HVM-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVM-ADJ is usually 5 days.
3.What payment methods are accepted for LM2574HVM-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVM-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVM-ADJ?
LM2574HVM-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVM-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 LM2574HVM-ADJ?
For technical support, including LM2574HVM-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVM-ADJ requirements.
6.How does Aetrix verify that LM2574HVM-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2574HVM-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 LM2574HVM-ADJ meets industry standards.
7.What is the process for return or replacement of LM2574HVM-ADJ?
All LM2574HVM-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVM-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 LM2574HVM-ADJ part is unused and in its original packaging.
Return procedure for LM2574HVM-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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