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Texas Instruments LM2574HVM-3.3
- Part No.:
- LM2574HVM-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVM-3.3.pdf
- Description:
- IC REG BUCK 3.3V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2574HVM-3.3 from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator in a 14-lead wide surface-mount package, delivering a fixed 3.3V output with ±4% tolerance over line and load, 52 kHz fixed-frequency operation, and input voltage support up to 60V. It integrates oscillator, error amplifier, PWM comparator, and 0.5A NPN switch for compact, high-efficiency DC/DC conversion in industrial power rails.
For engineers reviewing the LM2574HVM-3.3 datasheet, LM2574HVM-3.3 pinout, LM2574HVM-3.3 application, or LM2574HVM-3.3 equivalent, key selection considerations include its HV-rated 60V max input, thermal shutdown and cycle-by-cycle current limiting, TTL-compatible ON/OFF control with 50 µA standby current, and compatibility with standard off-the-shelf inductors - all critical for ruggedized embedded power supply design.
Technical Context
The LM2574HVM-3.3 implements a fixed-frequency, current-mode buck topology with internal 52 kHz oscillator and integrated 0.5A NPN power switch. Its feedback loop uses a precision 1.23V reference and external resistor divider (not required for fixed-output versions), enabling stable regulation under varying load and line conditions.
Protection architecture includes cycle-by-cycle peak current limiting (1.0A typical limit), thermal shutdown at 150°C junction temperature, and TTL-level ON/OFF pin with 1.4V VIH minimum and 1.2V VIL maximum - allowing direct microcontroller interface without level shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over full operating range (4.75–60V input, 0.1–0.5A load) |
| Max Input Voltage | 60V - supports wide-input industrial, automotive, and telecom power buses |
| Output Current | Guaranteed 0.5A continuous - sufficient for powering microcontrollers, FPGAs, and peripheral ICs |
| Switching Frequency | 52 kHz fixed - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity |
| Efficiency | 72% at 12VIN/3.3VOUT/0.5A - significantly higher than linear regulators, minimizing board-level heat sinking |
| Standby Current | 50 µA typical at OFF state - enables low-power system sleep modes |
| Thermal Resistance | 78°C/W (θJA, M-package with 4 in² copper) - allows full 0.5A load without heatsink under typical PCB layout |
Pinout & Package
LM2574HVM-3.3 is housed in a 14-lead wide surface-mount (WM) package (NS package code M14B), optimized for thermal performance with exposed pad grounding and low-profile mounting. Pinout conforms to National Semiconductor's standard LM2574 pin assignment for fixed-output variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Primary DC input (4.75–60V); requires local 22 µF electrolytic bypass |
| 2 (GND) | Power Ground | Common return for input capacitor, output capacitor, and catch diode cathode |
| 3 (OUT) | Switch Node | Drives external catch diode anode and inductor; carries pulsed 0.5A switching current |
| 4 (GND) | Power Ground | Second ground pin for improved thermal and current path integrity |
| 5 (ON/OFF) | Enable Control | TTL-compatible shutdown pin; <1.2V = ON, >1.4V = OFF; draws ≤30 µA in OFF state |
| 6 (GND) | Power Ground | Third ground pin supporting low-impedance return for high-frequency switching currents |
| 7 (GND) | Power Ground | Fourth ground pin enhancing thermal conduction to PCB copper |
| 8 (GND) | Power Ground | Fifth ground pin - all GND pins must be tied together and connected to large copper pour |
| 9 (GND) | Power Ground | Sixth ground pin - critical for EMI suppression and thermal management |
| 10 (GND) | Power Ground | Seventh ground pin - ensures robust ground plane coupling |
| 11 (GND) | Power Ground | Eighth ground pin - completes low-inductance ground network |
| 12 (GND) | Power Ground | Ninth ground pin - supports high-current return path integrity |
| 13 (GND) | Power Ground | Tenth ground pin - minimizes ground bounce during switching transitions |
| 14 (GND) | Power Ground | Eleventh ground pin - ties exposed thermal pad to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5A NPN Switch | Eliminates need for external power transistor, reducing BOM count and layout area |
| Fixed 52 kHz Oscillator | Enables predictable EMI spectrum and simplifies filter design vs. variable-frequency controllers |
| Cycle-by-Cycle Current Limit | Protects against short-circuit and overload faults without latch-up or external sensing components |
| Thermal Shutdown | Automatically disables switching above 150°C junction temperature, preventing permanent damage |
| TTL-Compatible Enable | Direct interfacing with 3.3V/5V logic outputs - no pull-up or level-shifting circuitry required |
Applications
| Industrial PLC Power Supply | Embedded Microcontroller Rail |
|---|---|
Use Scenario: Providing regulated 3.3V power to I/O modules and communication interfaces in programmable logic controllers operating from 24V DC field buses. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24V bus to clean 3.3V for ARM Cortex-M or RISC-V SoCs and RS-485 transceivers. Use Value: Withstands 60V transients per IEC 61000-4-5, delivers 0.5A continuously, and maintains ±4% regulation across -40°C to +125°C ambient - ensuring reliability in factory-floor environments. | Use Scenario: Generating local 3.3V supply for battery-backed real-time clocks, sensor hubs, and low-power wireless SoCs in portable industrial gateways. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding LDOs or directly powering ultra-low-power MCUs in always-on monitoring nodes. Use Value: 50 µA standby current enables multi-year battery life in sleep mode; fixed 3.3V output eliminates external feedback resistors and calibration overhead. |
| Telecom Line Card Bias | Ruggedized Data Acquisition Front-End |
Use Scenario: Delivering isolated 3.3V bias to analog front-ends and ADC drivers on telecom line cards powered from -48V DC distribution systems. IC Role / Device Role / Timing Role: High-input-voltage buck converter stepping down -48V-derived positive rail (e.g., +60V via auxiliary supply) to 3.3V for signal conditioning circuits. Use Value: 60V absolute maximum input rating accommodates worst-case surge conditions; 72% efficiency at 12VIN reduces thermal stress on densely packed line cards. | Use Scenario: Powering precision ADCs, op-amps, and multiplexers in vibration-monitoring sensors deployed in oil & gas or transportation infrastructure. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying low-noise 3.3V rail with tight load regulation (<±0.1% typical) for 16-bit+ data converters. Use Value: Fixed-frequency operation enables synchronous noise filtering; thermal shutdown prevents drift-induced measurement errors during extended high-temp operation. |
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-3.3 | Higher 3A output current, 52 kHz frequency, wider 60V input, but larger SOIC-16 package and higher quiescent current (10 mA vs. 5 mA active) | Better suited for higher-current loads (>0.5A); less optimal for space-constrained designs where LM2574HVM-3.3's 14-pin WM footprint is preferred | Select LM2574HVM-3.3 when 0.5A is sufficient and PCB area is limited; choose LM2576HVS-3.3 only if future load growth or margin headroom justifies larger size and cost |
| TPS54302DDCR | 3A synchronous buck, 2.5–6V input, 3.3V fixed output, 2MHz switching, integrated MOSFETs, but incompatible 60V input requirement | Designed for low-input-voltage point-of-load applications (e.g., 5V or 3.3V intermediate rails), not wide-input industrial supplies | Not suitable as direct alternative for 60V-input use cases; consider only if system redesign permits lower input voltage architecture |
Compared with LM2576HVS-3.3 and TPS54302DDCR, the LM2574HVM-3.3 offers the optimal balance of 60V input capability, compact 14-pin WM packaging, and proven ruggedness in harsh environments - making it the preferred choice for legacy-compatible, space-constrained, wide-input industrial power supplies requiring exactly 0.5A at 3.3V.
Availability
LM2574HVM-3.3 is available at Aetrix Electronics and suitable for industrial PLCs, embedded microcontroller power rails, telecom line card biasing, and ruggedized data acquisition front-ends requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM2574HVM-3.3 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 line, including long-term support for industrial-grade analog power ICs.
The LM2574HVM-3.3 belongs to TI's SIMPLE SWITCHER™ family of monolithic buck regulators, designed specifically for robust, low-component-count DC/DC conversion in industrial, automotive, and telecom applications where reliability under voltage transients and wide temperature operation is mandatory.
FAQ
What is the maximum input voltage rating for the LM2574HVM-3.3?
The LM2574HVM-3.3 has a maximum input voltage rating of 60V, confirmed in the Absolute Maximum Ratings table and Operating Ratings section of the official datasheet. This HV designation distinguishes it from the standard LM2574 (40V max), enabling use in 24V, 36V, and 48V industrial bus systems with transient margin. Exceeding 60V risks permanent device failure.
Does the LM2574HVM-3.3 require external feedback resistors to set its output voltage?
No, the LM2574HVM-3.3 is a fixed-output variant and does not require external feedback resistors. Its 3.3V regulation is implemented internally using a precision 1.23V reference and trimmed resistor network. External resistors are only needed for the adjustable version (LM2574HVM-ADJ); adding them to the LM2574HVM-3.3 would disrupt regulation and is not supported.
What package type is used by the LM2574HVM-3.3, and how many pins does it have?
The LM2574HVM-3.3 uses a 14-lead wide surface-mount (WM) package, identified by National Semiconductor package code M14B. It contains 14 physical leads, with pins 2, 4, and 6–14 all designated as GND for enhanced thermal dissipation and low-impedance grounding - a key differentiator from the 8-pin DIP version (LM2574HVN-3.3).
Can the LM2574HVM-3.3 be synchronized to an external clock source?
No, the LM2574HVM-3.3 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 newer TPS54x series or LM5116, but these require architectural changes and do not maintain pin or functional compatibility with the LM2574HVM-3.3.
What is the guaranteed output current capability of the LM2574HVM-3.3 across temperature?
The LM2574HVM-3.3 guarantees 0.5A output current over its full operating junction temperature range of −40°C to +125°C, as specified in the Electrical Characteristics table under "Guaranteed 0.5A output current" and confirmed in thermal derating curves. Performance remains within ±4% output voltage tolerance at this load when proper PCB copper area (≥4 in²) is used for thermal management.
LM2574HVM-3.3 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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
LM2574HVM-3.3 FAQ
1.How can I place an order for LM2574HVM-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVM-3.3 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-3.3 reliable?
The price and inventory of LM2574HVM-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVM-3.3 is usually 5 days.
3.What payment methods are accepted for LM2574HVM-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVM-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVM-3.3?
LM2574HVM-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVM-3.3 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-3.3?
For technical support, including LM2574HVM-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVM-3.3 requirements.
6.How does Aetrix verify that LM2574HVM-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2574HVM-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LM2574HVM-3.3?
All LM2574HVM-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVM-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LM2574HVM-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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