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Texas Instruments LM2574HVM-ADJ/NOPB
- Part No.:
- LM2574HVM-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVM-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,217
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Product details
Overview
LM2574HVM-ADJ/NOPB from Texas Instruments is a monolithic 0.5A step-down (buck) switching voltage regulator in a 14-pin wide surface-mount package, featuring adjustable output (1.23V–37V), 52 kHz fixed-frequency operation, 60V 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 high efficiency and minimal external components.
For engineers reviewing the LM2574HVM-ADJ/NOPB datasheet, LM2574HVM-ADJ/NOPB pinout, LM2574HVM-ADJ/NOPB application, or LM2574HVM-ADJ/NOPB equivalent, key selection considerations include its HV input rating (60V), feedback voltage reference (1.23V), ON/OFF control interface, thermal resistance (78°C/W), and compatibility with standard off-the-shelf inductors for rapid buck converter design.
Technical Context
The LM2574HVM-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 DMOS transistor with 1.2 V saturation voltage at 0.5A, enabling continuous-mode operation with external catch diode, inductor, and capacitors.
Feedback is implemented via a precision 1.23V reference applied to the FB pin, allowing output voltage programming using two external resistors. The ON/OFF pin supports TTL-compatible shutdown with 50 µA standby current, while cycle-by-cycle current limiting (0.65–1.8A) and thermal shutdown ensure fault robustness under overload or short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 0.5A DC load capability - sufficient for powering microcontrollers, sensors, and analog circuitry without external current boosting. |
| Input Voltage Range | 4.75V to 60V - supports wide-input industrial, automotive, and telecom power rails including unregulated 48V systems. |
| Output Voltage Range | 1.23V to 37V (adjustable via external resistor divider) - enables flexible rail generation from single supply, including 3.3V, 5V, 12V, 15V, and custom values. |
| Oscillator Frequency | 52 kHz (±10%) - low-frequency switching reduces EMI and allows use of low-cost, high-saturation-current inductors. |
| Feedback Reference | 1.230V ±1.3% (min/max over temp and load) - sets output accuracy baseline; combined with resistor tolerance determines final VOUT error. |
| Thermal Resistance | 78°C/W (junction-to-ambient, 4-in² copper) - enables full 0.5A operation without heatsink when PCB layout includes adequate copper area. |
| Standby Current | 50 µA typical (ON/OFF pin = 5V) - supports low-power sleep modes in battery-backed or energy-sensitive systems. |
Pinout & Package
LM2574HVM-ADJ/NOPB uses the 14-pin wide surface-mount (WM) package (NS package code M14B), optimized for thermal performance and board space efficiency. The exposed pad is electrically connected to GND and must be soldered to a thermal pad on the PCB for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7 | GND | Power and signal ground reference; pins 1–7 are internally bonded together and must be connected to a common low-impedance ground plane. |
| 8 | FB | Feedback input - connects to resistor divider midpoint; senses output voltage and regulates to 1.23V reference. |
| 9 | VIN | Main input supply - accepts 4.75V–60V; requires local 22 µF electrolytic bypass capacitor. |
| 10 | ON/OFF | Logic-level enable/disable - driven high (>2.4V) for operation, low (<0.8V) for shutdown (50 µA quiescent). |
| 11 | OUT | Switching output - drives external catch diode and inductor; peak current up to 1.8A during current limiting. |
| 12, 13, 14 | GND | Additional ground terminals - reinforce thermal and electrical connection to PCB ground plane; must be soldered. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Protection | Thermal shutdown + cycle-by-cycle current limiting - prevents damage during sustained overload or output short without external sensing components. |
| Low External Part Count | Only four external components required (inductor, catch diode, input/output capacitors) - accelerates design and reduces BOM cost and footprint. |
| High-Voltage Input Support | 60V max input rating - eliminates need for pre-regulation in 48V industrial or PoE-powered systems. |
| Fixed-Frequency Operation | 52 kHz internal oscillator - simplifies EMI filtering and avoids audible noise; enables predictable ripple and transient response. |
| Efficiency Optimization | Up to 88% efficiency (e.g., 12V→5V @ 0.5A) - reduces thermal load vs. linear regulators and minimizes copper trace heating. |
Applications
| Industrial Power Supply | Automotive Subsystem |
|---|---|
Use Scenario: On-board 24V-to-5V conversion for PLC I/O modules operating in harsh factory environments with wide temperature and input voltage variation. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5V to microcontroller, CAN transceiver, and analog front-end. Use Value: 60V input rating tolerates load-dump transients; thermal shutdown ensures reliability during ambient temperature spikes up to +125°C. | Use Scenario: Powering infotainment display logic from vehicle battery (9V–16V nominal, up to 40V during cold-crank or alternator surge). IC Role / Device Role / Timing Role: Pre-regulator stepping down battery voltage to 3.3V/5V for digital subsystems before LDO post-regulation. Use Value: 52 kHz switching avoids AM-band interference; ±4% output tolerance meets automotive MCU supply requirements without closed-loop trimming. |
| Telecom Equipment | Test & Measurement Instrument |
Use Scenario: Generating isolated 12V and 15V rails from 48V backplane in modular base station cards. IC Role / Device Role / Timing Role: High-efficiency buck converter feeding downstream DC/DC modules or op-amp supplies. Use Value: Adjustable output supports multiple rail configurations from one BOM; 0.5A output sustains burst loads during RF transmission cycles. | Use Scenario: Portable oscilloscope main power stage converting Li-ion battery (3.0–4.2V) to regulated 3.3V for FPGA and ADC subsystems. IC Role / Device Role / Timing Role: Primary switching regulator enabling >10-hour runtime by minimizing quiescent loss. Use Value: 50 µA shutdown current extends battery life in sleep mode; 1.23V feedback reference allows precise low-voltage rail calibration. |
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/NOPB | 1.25A output current, 63V max input, 52 kHz frequency, same pinout but larger thermal pad requirement. | Higher current delivery for multi-rail systems; requires larger inductor and diode due to increased peak currents. | Select when >0.5A load current or higher efficiency at light loads is required; verify PCB thermal relief for larger package. |
| TPS54202DRCT | 2A output, 2.9–17V input, 500 kHz switching, integrated MOSFETs, smaller 10-pin WSON package. | Not suitable for >17V input or 60V transients; higher frequency demands tighter layout and lower-ESR capacitors. | Prefer for compact, high-density designs with <17V input; avoid where 60V surge immunity or legacy inductor compatibility is critical. |
Compared with LM2574HVM-ADJ/NOPB, LM2576HVS-ADJ/NOPB offers higher current headroom and identical HV capability but demands greater board area, while TPS54202DRCT delivers superior integration and density at the expense of input voltage range and transient robustness.
Availability
LM2574HVM-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive subsystems, and telecom equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM2574HVM-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 the SIMPLE SWITCHER™ product line as a portfolio of easy-to-use, highly reliable DC/DC converters.
The LM2574 series was designed specifically for cost-sensitive, high-reliability buck converter applications where simplicity, thermal robustness, and wide input voltage range outweigh the need for ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage supported by the LM2574HVM-ADJ/NOPB?
The LM2574HVM-ADJ/NOPB supports a maximum input voltage of 60V, as specified in its Absolute Maximum Ratings and Operating Ratings. This HV version is distinct from the standard LM2574 (40V max), making it suitable for industrial 48V systems and automotive load-dump scenarios. Exceeding 60V may cause permanent device failure.
How is the output voltage set on the LM2574HVM-ADJ/NOPB?
The LM2574HVM-ADJ/NOPB uses a resistor divider between VOUT and GND, with the midpoint connected to the FB pin. Output voltage is calculated as VOUT = 1.23V × (1 + R1/R2), where R1 connects FB to VOUT and R2 connects FB to GND. Standard 1% metal-film resistors are recommended for stability across temperature and time.
Does the LM2574HVM-ADJ/NOPB require an external catch diode, and what type is recommended?
Yes, the LM2574HVM-ADJ/NOPB requires an external Schottky or fast-recovery catch diode. For 0.5A operation, TI recommends diodes such as MBR150 (50V, 1A) or 11DQ05 (50V, 1A). The diode's reverse voltage rating must exceed 1.25× the maximum input voltage (e.g., ≥75V for 60V VIN), and its forward current rating should be ≥1.5× the load current.
What is the thermal performance of the LM2574HVM-ADJ/NOPB in its 14-pin WM package?
The LM2574HVM-ADJ/NOPB has a junction-to-ambient thermal resistance (θJA) of 78°C/W when mounted on a PCB with 4 square inches of 1 oz. copper. With proper thermal pad soldering and copper pour, it can deliver full 0.5A output continuously at +125°C ambient. Derating is required above 100°C ambient or with less copper area.
Can the LM2574HVM-ADJ/NOPB be synchronized to an external clock?
No, the LM2574HVM-ADJ/NOPB does not support external clock synchronization. Its 52 kHz oscillator is fully internal and fixed-frequency. For synchronizable alternatives, consider newer TI parts like the LM5115 or TPS54x02 series, which offer external sync inputs but differ in voltage range, current capability, and package.
LM2574HVM-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
LM2574HVM-ADJ/NOPB FAQ
1.How can I place an order for LM2574HVM-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVM-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 LM2574HVM-ADJ/NOPB reliable?
The price and inventory of LM2574HVM-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 LM2574HVM-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574HVM-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVM-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVM-ADJ/NOPB?
LM2574HVM-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVM-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 LM2574HVM-ADJ/NOPB?
For technical support, including LM2574HVM-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVM-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2574HVM-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574HVM-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 LM2574HVM-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574HVM-ADJ/NOPB?
All LM2574HVM-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVM-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 LM2574HVM-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2574HVM-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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