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Texas Instruments LM2574HVMX-3.3/NOPB
- Part No.:
- LM2574HVMX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVMX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:940
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Product details
Overview
LM2574HVMX-3.3/NOPB from Texas Instruments is a monolithic 0.5A step-down (buck) switching voltage regulator in SOIC-14 package, delivering fixed 3.3V output with ±4% tolerance over line and load, 52 kHz fixed-frequency operation, and 60V maximum input voltage. It integrates oscillator, PWM controller, and power switch for high-efficiency DC/DC conversion in industrial power supplies.
For engineers reviewing the LM2574HVMX-3.3/NOPB datasheet, LM2574HVMX-3.3/NOPB pinout, LM2574HVMX-3.3/NOPB application, or LM2574HVMX-3.3/NOPB equivalent, key selection considerations include its HV-rated input range (up to 60V), thermal shutdown protection, TTL-compatible shutdown pin, cycle-by-cycle current limiting, and requirement for only four external components (inductor, diode, input/output capacitors).
Technical Context
The LM2574HVMX-3.3/NOPB implements a fixed-frequency, current-mode buck topology with internal 52 kHz oscillator and integrated NPN power switch. Its control loop uses internal frequency compensation and relies on external feedback via a single resistor divider only in adjustable versions - not applicable here, as this is a fixed 3.3V variant.
It features cycle-by-cycle peak current limiting (1.0 A typical), thermal shutdown activation at ~150°C junction temperature, and a dedicated ON/OFF pin enabling 50 µA standby current. The device operates across −40°C to +125°C junction temperature and supports continuous-mode operation with standard off-the-shelf inductors (e.g., 330 µH for 12VIN/3.3VOUT @ 0.5A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over 4.75–60 V input and 0.1–0.5 A load - ensures stable logic rail generation without external feedback resistors. |
| Max Input Voltage | 60 V - enables direct regulation from unregulated 48V telecom or industrial bus rails without pre-regulation. |
| Output Current | Guaranteed 0.5 A - sufficient to power microcontrollers, FPGAs, and peripheral ICs in embedded systems. |
| Switching Frequency | 52 kHz fixed - simplifies EMI filtering design and allows use of low-cost, high-saturation-current inductors. |
| Efficiency | 72% at 12 VIN, 0.5 A load - reduces thermal load versus linear regulators, eliminating need for heatsinks in most PCB layouts. |
| Standby Current | 50 µA typical at shutdown - supports low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Protection | Internal thermal shutdown - prevents damage during overload or poor heatsinking; auto-recovery upon cooldown. |
Pinout & Package
LM2574HVMX-3.3/NOPB is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, designated NS package code M14B, with exposed pad for enhanced thermal dissipation. Thermal resistance is 78°C/W (junction-to-ambient, 4 in² copper) - requires minimum 1 cm² copper pour under exposed pad for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 4.75–60 V DC; must be bypassed with ≥22 µF electrolytic capacitor near pin. |
| 2 (GND) | Power Ground | Common return for input cap, output cap, and catch diode cathode; single-point grounding recommended. |
| 3 (OUT) | Switch Node | Drives external catch diode anode and inductor; carries pulsed 0.5 A current; layout critical for EMI control. |
| 4 (GND) | Power Ground | Second ground pin for improved current return path; must connect directly to main ground plane. |
| 5 (ON/OFF) | Shutdown Control | TTL-compatible enable pin; <1.0 V = ON, >2.2 V = OFF; draws ≤30 µA in shutdown. |
| 6 (GND) | Power Ground | Third ground pin; ties internal substrate to PCB ground for noise immunity. |
| 7 (GND) | Power Ground | Fourth ground pin; enhances thermal conduction and reduces ground impedance. |
| 8 (GND) | Power Ground | Fifth ground pin; connects to exposed thermal pad; soldering required for thermal performance. |
| 9–14 (NC) | No Connection | Not internally bonded; left unconnected per TI datasheet DS011394 - no routing or stitching required. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Support | 60 V max input enables direct interface with 48V industrial, automotive, or PoE-derived rails without front-end buck or LDO pre-regulation. |
| Integrated Power Switch | Internal NPN transistor eliminates need for external MOSFET or driver, reducing BOM count and layout complexity. |
| Fixed-Frequency Operation | 52 kHz oscillator provides predictable EMI spectrum and simplifies filter design versus variable-frequency alternatives. |
| Robust Fault Protection | Cycle-by-cycle current limit (1.0 A typ) plus thermal shutdown prevent catastrophic failure during short-circuit or overtemperature events. |
| Low-Component Count Design | Only four external parts required - inductor, Schottky catch diode, input capacitor, output capacitor - accelerates prototyping. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit |
|---|---|
Use Scenario: Powers 3.3V microcontroller, CAN transceiver, and analog sensor interfaces within DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V DC field bus to clean 3.3V logic supply; provides regulated rail independent of input ripple or load transients. Use Value: Delivers 0.5A at 72% efficiency with no heatsink needed, meeting EN 61000-6-4 emission limits when laid out per TI layout guidelines. | Use Scenario: Supplies 3.3V rail to body control module MCU and LIN transceivers in 12V/24V vehicle architectures. IC Role / Device Role / Timing Role: High-input-voltage buck converter handling cold-crank (up to 60V transient) and load-dump conditions while maintaining regulation. Use Value: Withstands 60V absolute max input and includes thermal shutdown, ensuring reliability in under-hood temperature extremes (−40°C to +125°C). |
| Medical Point-of-Care Instrument | Telecom Remote Radio Unit |
Use Scenario: Generates isolated 3.3V supply for FPGA-based signal processing in portable ultrasound or patient monitor subsystems. IC Role / Device Role / Timing Role: Efficient pre-regulator stepping down 12V intermediate rail to 3.3V before low-noise LDO post-regulation. Use Value: Reduces heat generation vs. linear solution, extending battery life and easing thermal management in compact enclosures. | Use Scenario: Provides 3.3V bias for RF front-end ICs and digital baseband in outdoor small-cell radio units powered from 48V DC plant feed. IC Role / Device Role / Timing Role: Primary DC/DC converter operating from telecom-grade −48V nominal (rectified to +48V) with wide input tolerance. Use Value: Supports 60V max input and delivers 0.5A with minimal external components - ideal for space-constrained RRUs requiring high reliability. |
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 | 1.25A output current, 52 kHz frequency, same 60V input rating but larger SOIC-15 package with different pinout. | Higher current capability suits designs scaling beyond 0.5A; requires PCB redesign due to non-pin-compatible footprint. | Select when future-proofing for higher load or needing margin for derating; verify thermal layout for increased power dissipation. |
| TPS5430DDAR | 3A output, 500 kHz switching, integrated high-side MOSFET, requires external compensation; 36V max input (not HV). | Better efficiency and smaller magnetics at higher frequency; unsuitable for >36V inputs like 48V telecom buses. | Choose for compact, high-efficiency designs with ≤36V input and >1A loads; avoid where 60V transient immunity is mandatory. |
Compared with LM2574HVMX-3.3/NOPB, LM2576HVS-3.3 offers 2.5× higher current in a mechanically incompatible package, while TPS5430DDAR trades HV input capability for higher frequency and integration - making LM2574HVMX-3.3/NOPB optimal for cost-sensitive, 0.5A, 60V-tolerant industrial applications requiring minimal external parts.
Availability
LM2574HVMX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LM2574HVMX-3.3/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 full technical support, documentation, and manufacturing continuity for the SIMPLE SWITCHER™ product family.
The LM2574HVMX-3.3/NOPB belongs to TI's SIMPLE SWITCHER™ buck regulator series, designed specifically for engineers needing robust, low-component-count DC/DC solutions for harsh industrial and automotive environments.
FAQ
What is the maximum input voltage rating for LM2574HVMX-3.3/NOPB?
The LM2574HVMX-3.3/NOPB has a maximum input voltage rating of 60 V, confirmed in the Absolute Maximum Ratings table of TI's official datasheet DS011394. This HV rating distinguishes it from the standard LM2574 (45 V max) and enables direct regulation from 48 V telecom or industrial bus rails, including transient surges up to 60 V.
Does LM2574HVMX-3.3/NOPB require external feedback resistors to set output voltage?
No, LM2574HVMX-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its 3.3 V regulation is implemented internally - unlike the adjustable LM2574HV-ADJ version. The feedback pin (FB) is not brought out; output voltage accuracy is maintained at ±4% over line, load, and temperature without user configuration.
What package type and thermal characteristics apply to LM2574HVMX-3.3/NOPB?
LM2574HVMX-3.3/NOPB uses a 14-pin SOIC package (NS M14B) with an exposed thermal pad. Its junction-to-ambient thermal resistance is 78°C/W with 4 in² of 1 oz. copper - significantly lower than the 102°C/W for minimal copper. Soldering the exposed pad is mandatory to achieve rated 0.5 A output current and thermal shutdown threshold.
Can LM2574HVMX-3.3/NOPB be used in discontinuous conduction mode (DCM)?
Yes, LM2574HVMX-3.3/NOPB supports both continuous and discontinuous conduction modes. DCM occurs naturally at light loads (<~50 mA) and is fully characterized in TI's datasheet. No design changes are needed - the IC maintains regulation, though output ripple increases slightly and efficiency drops modestly below 10% load.
What is the recommended catch diode for LM2574HVMX-3.3/NOPB in a 12V-to-3.3V application?
TI recommends a Schottky diode with ≥1 A average current rating and ≥20 V reverse voltage, such as the 1N5817 or SR102, for LM2574HVMX-3.3/NOPB in 12V-to-3.3V designs. These minimize forward voltage drop and switching losses, directly improving efficiency - especially critical given the LM2574HVMX-3.3/NOPB's 72% typical efficiency at 0.5 A.
LM2574HVMX-3.3/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:
- 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
LM2574HVMX-3.3/NOPB FAQ
1.How can I place an order for LM2574HVMX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVMX-3.3/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-3.3/NOPB reliable?
The price and inventory of LM2574HVMX-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574HVMX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVMX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVMX-3.3/NOPB?
LM2574HVMX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVMX-3.3/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-3.3/NOPB?
For technical support, including LM2574HVMX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVMX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2574HVMX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574HVMX-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574HVMX-3.3/NOPB?
All LM2574HVMX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVMX-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2574HVMX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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