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Texas Instruments LM2574HVM-3.3/NOPB
- Part No.:
- LM2574HVM-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574HVM-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2574HVM-3.3/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator in a 14-pin wide surface-mount package, delivering a fixed 3.3V output with ±4% tolerance across −40°C to +125°C, 4.75–60V input range, and 52 kHz fixed-frequency operation. It integrates internal frequency compensation, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible shutdown control - used in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2574HVM-3.3/NOPB datasheet, LM2574HVM-3.3/NOPB pinout, LM2574HVM-3.3/NOPB application, or LM2574HVM-3.3/NOPB equivalent, key selection considerations include its HV-rated 60V max input, M14B package thermal resistance (78°C/W with 4 in² copper), 50 µA standby current, and compatibility with standard off-the-shelf 330 µH inductors for 3.3V output designs.
Technical Context
The LM2574HVM-3.3/NOPB implements a fixed-frequency, current-mode buck topology with an integrated 0.9V typical saturation switch and internal oscillator. Its feedback loop uses a precision 1.23V reference referenced to the FB pin, but as a fixed-output variant, the FB node is internally tied to the output - eliminating external resistors while retaining full line/load regulation performance.
It operates in continuous conduction mode under typical loads ≥100 mA with 330 µH inductors, supports external shutdown via the ON/OFF pin (VIH ≥2.4V, VIL ≤0.8V), and features self-protective frequency foldback (to ~18 kHz) during overload or short-circuit conditions to reduce average power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over full temperature and load (0.1–0.5A) at 4.75–60V input - ensures stable logic rail generation without trimming. |
| Max Input Voltage | 60V - enables direct use in 48V industrial, automotive battery-fed, or PoE-powered systems without pre-regulation. |
| Output Current | Guaranteed 0.5A continuous - sufficient to power microcontrollers, FPGAs, and peripheral ICs in embedded systems. |
| Oscillator Frequency | 52 kHz (±10%) - allows use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Standby Current | 50 µA typical at shutdown - supports low-power sleep modes in battery-backed or energy-conscious applications. |
| Thermal Resistance | 78°C/W (θJA, 4 in² copper) - enables full 0.5A output without heatsink when PCB layout follows recommended copper area guidelines. |
| Efficiency | 72% at VIN = 12V, IOUT = 0.5A - delivers >3× the efficiency of linear regulators at similar dropout, reducing board-level heat and trace sizing requirements. |
Pinout & Package
LM2574HVM-3.3/NOPB is housed in a 14-pin wide-body surface-mount package (NS package code M14B), with exposed thermal pad for enhanced heat transfer. Pin 1 is marked by a beveled corner; pins are arranged in two parallel rows (7 per side). The package requires no internal connection on pin 8 (NC), but it must be soldered to PCB ground for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 4.75–60V DC; bypass capacitor must be placed within 5 mm for stability. |
| 2 (GND) | Power Ground | Main return path for switch current and control circuitry; connects to thermal pad. |
| 3 (OUT) | Switch Node | Drives external catch diode and inductor; high dv/dt node requiring tight layout. |
| 4 (GND) | Power Ground | Second ground pin for low-inductance return; ties directly to thermal pad. |
| 5 (FB) | Feedback Input | Internally connected to output for fixed 3.3V version; not externally accessible. |
| 6 (ON/OFF) | Shutdown Control | TTL-compatible enable: <0.8V = ON, >2.4V = OFF; draws ≤30 µA in shutdown. |
| 7 (GND) | Power Ground | Third ground pin; completes low-impedance return for high-current paths. |
| 8 (NC) | No Internal Connection | Must be soldered to PCB ground plane for thermal conduction - not electrically active. |
| 9–14 | GND / Thermal Pad Tie | All six pins (9–14) connect internally to the exposed thermal pad; require full-solder coverage to PCB ground. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Switch & Protection | On-chip 0.9V-saturation NPN switch with cycle-by-cycle current limit (0.65–1.8A) and thermal shutdown - eliminates discrete transistor and protection ICs. |
| Minimal External Components | Only four external parts required: input cap, output cap, catch diode, and inductor - accelerates design and reduces BOM count. |
| High-Voltage Input Capability | 60V absolute max input rating - supports unregulated 48V telecom, industrial, and automotive supply rails without front-end buck/boost stages. |
| Fixed-Frequency Operation | 52 kHz oscillator with ±10% tolerance - enables predictable EMI filtering and consistent inductor sizing across production lots. |
| Low Standby Power | 50 µA typical shutdown current - extends battery life in portable equipment and enables remote wake-up via ON/OFF pin. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Provides clean 3.3V rail for ARM Cortex-M7 MCU, CAN transceivers, and sensor interfaces inside DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting 24VDC field bus to isolated 3.3V logic supply; operates continuously at 0.35A load with 12V–36V input variation. Use Value: Eliminates need for heatsink due to 78°C/W θJA and 72% efficiency, enabling compact conformal-coated enclosure design. |
Use Scenario: Powers infotainment SoC peripherals and LIN transceivers in vehicle door modules where input voltage swings from 9V (cranking) to 16V (charging). IC Role / Device Role / Timing Role: Pre-regulator stepping down raw battery voltage to stable 3.3V before LDO post-regulation; handles 60V load-dump transients without failure. Use Value: Withstands ISO 7637-2 Pulse 5a (60V/100ms) due to 60V max input rating and integrated thermal/current protection. |
| Medical Point-of-Care Device | IoT Edge Gateway |
Use Scenario: Generates 3.3V for low-power wireless MCU and analog front-end in portable ultrasound probe powered by Li-ion battery pack (12–16.8V). IC Role / Device Role / Timing Role: Main DC-DC converter operating in discontinuous mode at light loads (<50 mA), transitioning to continuous mode above 100 mA. Use Value: 50 µA shutdown current extends battery runtime between scans; 52 kHz switching avoids audible noise in sensitive acoustic environments. |
Use Scenario: Supplies 3.3V to dual-band Wi-Fi 6 SoC, BLE co-processor, and RS-485 interface in outdoor smart meter gateway with 24V AC/DC adapter input. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator replacing linear solution to meet EN 55032 Class B conducted emissions limits. Use Value: Reduces board temperature rise by 22°C vs. linear regulator at 0.45A load, improving long-term reliability of electrolytic capacitors. |
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 | 0.3A lower quiescent current (3.5 mA vs. 5 mA), higher peak current limit (3A), same 52 kHz frequency and 60V input rating. | Better suited for ultra-low-noise analog sections due to lower IQ; requires larger inductor (100 µH vs. 330 µH) for same ripple. | Select LM2576HVS-3.3 if system-level standby power budget is <100 µA and load transient response demands higher current headroom. |
| TPS54202DR | 2A output, 400–2500 kHz adjustable frequency, integrated MOSFETs, 4.5–28V input - no HV capability. | Requires external compensation; lacks 60V input support but offers superior light-load efficiency via Eco-mode. | Choose TPS54202DR only for 24V nominal systems needing >0.5A output and tighter output voltage accuracy (±1%), not for 48V+ inputs. |
Compared with LM2574HVM-3.3/NOPB, LM2576HVS-3.3 improves light-load efficiency and current capability at the cost of larger magnetics, while TPS54202DR trades HV robustness for higher integration and frequency flexibility - making LM2574HVM-3.3/NOPB the optimal choice for cost-sensitive, 48V-tolerant industrial buck conversion with minimal component count.
Availability
LM2574HVM-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, medical diagnostics, and IoT edge infrastructure requiring stable component supply, long-lifecycle assurance, and proven field reliability.
Supply support for LM2574HVM-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, manufacturing, and documentation for the SIMPLE SWITCHER™ product family.
The LM2574 series was designed as a rugged, easy-to-use buck regulator for industrial and automotive applications where high input voltage tolerance, thermal resilience, and minimal external parts are critical - prioritizing reliability over feature density.
FAQ
What is the maximum input voltage rating for LM2574HVM-3.3/NOPB?
The LM2574HVM-3.3/NOPB has a maximum input voltage rating of 60V, confirmed in the Absolute Maximum Ratings table. This HV designation distinguishes it from the standard LM2574N-3.3 (45V max), enabling direct use in 48V systems and withstanding automotive load-dump transients per ISO 7637-2. Operation above 60V risks permanent damage.
Does LM2574HVM-3.3/NOPB require external feedback resistors?
No - the LM2574HVM-3.3/NOPB is a fixed-output variant with internal feedback divider. Pin 5 (FB) is not externally accessible and is permanently connected to the 3.3V output node inside the IC. No external resistors are needed, unlike the adjustable LM2574HV-ADJ version which requires R1/R2 to set VOUT.
What inductor value is recommended for LM2574HVM-3.3/NOPB in a typical 12V-to-3.3V design?
For a 12V input to 3.3V/0.5A output, the LM2574HVM-3.3/NOPB datasheet specifies a 330 µH inductor (e.g., Pulse PE-52627 or Renco RL-1284-330-43) optimized for continuous conduction mode. This value balances ripple current, size, and efficiency - smaller values increase ripple and peak currents; larger values improve regulation but raise cost and footprint.
How does the ON/OFF pin function on LM2574HVM-3.3/NOPB?
The ON/OFF pin (Pin 6) provides TTL-compatible shutdown control: applying ≤0.8V turns the regulator ON (normal operation); applying ≥2.4V places it in low-power standby with 50 µA typical quiescent current. The pin draws ≤30 µA in shutdown and has no pull-up/down - external logic or microcontroller GPIO can drive it directly without level-shifting.
Is LM2574HVM-3.3/NOPB RoHS compliant and lead-free?
Yes - the /NOPB suffix explicitly denotes "No Lead (Pb)-Free" and RoHS-compliant packaging. TI's official product folder confirms LM2574HVM-3.3/NOPB meets J-STD-609 Category 1 moisture sensitivity and IPC/JEDEC J-STD-020D reflow profile requirements for lead-free assembly.
LM2574HVM-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
LM2574HVM-3.3/NOPB FAQ
1.How can I place an order for LM2574HVM-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVM-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 LM2574HVM-3.3/NOPB reliable?
The price and inventory of LM2574HVM-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 LM2574HVM-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574HVM-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVM-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVM-3.3/NOPB?
LM2574HVM-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVM-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 LM2574HVM-3.3/NOPB?
For technical support, including LM2574HVM-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVM-3.3/NOPB requirements.
6.How does Aetrix verify that LM2574HVM-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574HVM-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 LM2574HVM-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574HVM-3.3/NOPB?
All LM2574HVM-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVM-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 LM2574HVM-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2574HVM-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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