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Texas Instruments LM2574HVN-5.0
- Part No.:
- LM2574HVN-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574HVN-5.0.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,239
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Product details
Overview
LM2574HVN-5.0 from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator in an 8-pin DIP package, delivering a fixed 5.0V output with ±4% tolerance over line and load, 52 kHz fixed-frequency operation, and 77% efficiency at 12V input/0.5A load. It serves as a high-efficiency replacement for linear regulators in embedded power supplies.
For engineers reviewing the LM2574HVN-5.0 datasheet, LM2574HVN-5.0 pinout, LM2574HVN-5.0 application, or LM2574HVN-5.0 equivalent, key selection considerations include its 60V maximum input voltage (HV version), internal current limiting and thermal shutdown, TTL-compatible ON/OFF control with 50 µA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2574HVN-5.0 integrates a PWM controller, power switch, oscillator, and protection circuitry into a single IC. Its fixed-frequency 52 kHz architecture enables predictable EMI filtering and simplifies external component selection-particularly inductors optimized for this frequency.
It operates in continuous conduction mode across typical loads (0.1–0.5A) and transitions to discontinuous mode at light loads. Internal cycle-by-cycle current limiting (1.0A typical peak) and thermal shutdown ensure robust fault handling without external sensing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% over full operating range (7–60V input, 0.1–0.5A load) |
| Max Input Voltage | 60V - supports wide industrial input rails, including 48V systems with margin |
| Output Current | Guaranteed 0.5A DC - sufficient for microcontroller cores, sensors, and logic rails |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors (e.g., 330 µH) |
| Efficiency | 77% at VIN = 12V, IOUT = 0.5A - reduces thermal load vs. linear regulators; PCB copper suffices as heatsink |
| Standby Current | 50 µA typical - enables low-power shutdown via TTL-level ON/OFF pin |
| Thermal Resistance | 92°C/W (junction-to-ambient, N package, 1 in² copper) - defines thermal design baseline for layout |
Pinout & Package
LM2574HVN-5.0 is housed in an 8-pin plastic DIP (NS package N08A), with Pin 1 designated as Input (VIN), Pin 2 as Ground (GND), Pin 3 as Output (VOUT), Pin 4 as Feedback (FB - internally tied to 5.0V reference for fixed version), Pin 5 as ON/OFF (TTL-compatible enable), Pin 6 as Ground (GND), Pin 7 as Output Switch (SW), and Pin 8 as No Internal Connection (NC - soldered to PCB for thermal relief).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input Supply (VIN) | Accepts 7–60V DC; requires ≥22 µF input capacitor near pin for stability |
| 2 | Ground (GND) | Power ground return; connects to SW node through internal switch |
| 3 | Regulated Output (VOUT) | 5.0V fixed output; drives load and feedback network; decoupled with ≥220 µF capacitor |
| 4 | Feedback (FB) | Internally connected to 5.0V reference; not user-accessible in fixed-output versions |
| 5 | ON/OFF Control | TTL-compatible enable: <1.0V = ON, >2.2V = OFF; draws ≤30 µA in shutdown |
| 6 | Ground (GND) | Second ground pin for improved thermal and noise performance |
| 7 | Switch Node (SW) | Internal power MOSFET drain; connects externally to catch diode anode and inductor |
| 8 | No Connect (NC) | No internal bond; must be soldered to PCB copper pour for thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external resistor divider; ensures stable regulation without calibration |
| 60V input rating (HV version) | Supports unregulated 48V telecom, industrial, and automotive battery inputs with headroom |
| Internal current limit & thermal shutdown | Enables self-protecting operation without external fault monitoring circuitry |
| 52 kHz fixed-frequency oscillator | Permits use of low-cost, high-current inductors and simplifies EMI filter design |
| TTL shutdown with 50 µA standby | Allows system-level power sequencing and ultra-low quiescent power in sleep modes |
Applications
| Industrial PLC I/O Power | Embedded Microcontroller Core Supply |
|---|---|
Use Scenario: Providing isolated 5V rail for digital I/O modules in programmable logic controllers operating from 24V or 48V field buses. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated bus voltage to clean, regulated 5V for logic-level interfacing and optocoupler drivers. Use Value: High efficiency (77%) minimizes heat buildup in sealed enclosures; 60V input withstands transients on industrial buses. | Use Scenario: Generating local 5V supply for ARM Cortex-M or PIC microcontrollers in battery-backed sensor nodes. IC Role / Device Role / Timing Role: On-board switching regulator replacing inefficient linear regulators to extend battery life. Use Value: 50 µA standby current enables deep-sleep modes; fixed 5V output eliminates trimming during production. |
| Point-of-Load Converter for FPGA Peripherals | Legacy System Retrofit Power |
Use Scenario: Delivering 5V to FPGA I/O banks, ADC references, and level-shifters in compact test equipment. IC Role / Device Role / Timing Role: Compact, low-component-count buck stage placed adjacent to load to minimize voltage drop and noise coupling. Use Value: Requires only four external components (inductor, diode, two capacitors); DIP package allows manual rework and prototyping. | Use Scenario: Replacing obsolete 7805 linear regulators in aging medical or instrumentation equipment where board space is constrained. IC Role / Device Role / Timing Role: Drop-in efficiency upgrade maintaining same 5V output and footprint compatibility (DIP-8). Use Value: Eliminates need for heatsinks; same pinout as legacy linear regulators eases redesign and qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-5.0 | Standard-voltage version (max 40V input) vs. HV's 60V; identical pinout, package, and electrical specs otherwise | Suitable only for ≤40V input systems; not recommended for 48V industrial or automotive applications | Select LM2574N-5.0 only if input never exceeds 40V and cost sensitivity outweighs transient margin |
| LM2596-5.0 | Higher 3A output current, 150 kHz switching, and improved efficiency (up to 92%); different pinout and package (TO-220-5) | Requires PCB redesign due to TO-220 footprint and altered pin assignment; better for higher-current loads | Choose LM2596-5.0 when load exceeds 0.5A or higher efficiency is critical; not a drop-in replacement |
Compared with LM2574N-5.0, the LM2574HVN-5.0 provides essential 60V input capability for harsh environments; compared with LM2596-5.0, it offers proven DIP-8 simplicity and lower EMI at 52 kHz-but at reduced current and efficiency.
Availability
LM2574HVN-5.0 is available at Aetrix Electronics and suitable for industrial automation, embedded microcontroller power, point-of-load conversion, and legacy system retrofits requiring stable component supply and long-lifecycle support.
Supply support for LM2574HVN-5.0 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™ portfolio, known for rugged, easy-to-use DC/DC regulators targeting cost-sensitive and reliability-critical applications.
The LM2574HVN-5.0 belongs to the SIMPLE SWITCHER™ buck regulator family, designed specifically for engineers needing minimal-external-component, high-voltage-input switching solutions in industrial, telecom, and embedded systems.
FAQ
What is the maximum input voltage rating for LM2574HVN-5.0?
The LM2574HVN-5.0 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 (High Voltage) variant distinguishes it from the standard LM2574N-5.0 (40V max), making LM2574HVN-5.0 suitable for 48V industrial buses and automotive applications with load-dump transients. Exceeding 60V risks permanent damage.
Does LM2574HVN-5.0 require an external feedback resistor network?
No, LM2574HVN-5.0 does not require external feedback resistors. As a fixed-output version, its internal feedback node is factory-trimmed to 5.0V and internally connected-Pin 4 (FB) is not user-accessible. This eliminates resistor tolerance errors and simplifies design versus the adjustable LM2574HVN-ADJ, which requires two external resistors to set VOUT.
What is the typical efficiency of LM2574HVN-5.0 at full load?
The typical efficiency of LM2574HVN-5.0 is 77% at VIN = 12V and IOUT = 0.5A, per the Electrical Characteristics table. Efficiency varies with input voltage and load: it rises to ~88% at higher input voltages (e.g., 15V→12V conversion) and decreases at lighter loads or lower input voltages. The 77% value reflects real-world performance under common mid-range conditions.
Can LM2574HVN-5.0 be used in discontinuous conduction mode?
Yes, LM2574HVN-5.0 operates reliably in both continuous and discontinuous conduction modes. At light loads (<~100 mA), inductor current drops to zero each cycle-this is normal and supported by the internal control architecture. The datasheet confirms stable regulation down to 0.1A, and typical waveforms (DS011394-7) explicitly show discontinuous-mode operation with 100 mA load and 100 µH inductor.
What package type is used for LM2574HVN-5.0?
LM2574HVN-5.0 uses an 8-pin plastic dual in-line package (DIP), identified as NS package number N08A. This through-hole package features Pin 8 as a no-connect thermal pad, intended to be soldered to PCB copper for enhanced heat dissipation. It is distinct from surface-mount variants like LM2574HVM-5.0 (14-pin WM package).
LM2574HVN-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2574HVN-5.0 FAQ
1.How can I place an order for LM2574HVN-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVN-5.0 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 LM2574HVN-5.0 reliable?
The price and inventory of LM2574HVN-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVN-5.0 is usually 5 days.
3.What payment methods are accepted for LM2574HVN-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVN-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVN-5.0?
LM2574HVN-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVN-5.0 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 LM2574HVN-5.0?
For technical support, including LM2574HVN-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVN-5.0 requirements.
6.How does Aetrix verify that LM2574HVN-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2574HVN-5.0 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 LM2574HVN-5.0 meets industry standards.
7.What is the process for return or replacement of LM2574HVN-5.0?
All LM2574HVN-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVN-5.0, 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 LM2574HVN-5.0 part is unused and in its original packaging.
Return procedure for LM2574HVN-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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