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Texas Instruments LM2574HVN-5.0/NOPB
- Part No.:
- LM2574HVN-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574HVN-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:811
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Product details
Overview
LM2574HVN-5.0/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 5.0V output, 52 kHz internal oscillator, 60V maximum input voltage, ±4% output voltage tolerance over line and load, and integrated thermal shutdown and cycle-by-cycle current limiting. It replaces linear regulators in industrial power supplies requiring efficient 5V rail generation from unregulated DC sources such as battery or rectified AC.
For engineers reviewing the LM2574HVN-5.0/NOPB datasheet, LM2574HVN-5.0/NOPB pinout, LM2574HVN-5.0/NOPB application, or LM2574HVN-5.0/NOPB equivalent, key selection criteria include input voltage range (7–60V), guaranteed 0.5A output current, DIP-8 package thermal performance (θJA = 72°C/W with 4 in² copper), TTL-compatible shutdown control, and compatibility with standard off-the-shelf 330 µH inductors.
Technical Context
The LM2574HVN-5.0/NOPB implements a fixed-frequency, current-mode buck topology with an integrated NPN power switch, internal frequency compensation, and a dedicated feedback comparator referenced to a stable 1.23V bandgap. Its 52 kHz oscillator enables use of low-cost, high-saturation-current inductors while maintaining manageable EMI and PCB layout simplicity.
Operation requires only four external components: input capacitor, output capacitor, catch diode, and power inductor. The device enters low-power standby mode (<200 µA) when the ON/OFF pin is pulled high, and features built-in protection including thermal shutdown and peak current limiting at 0.65–1.8 A depending on junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full operating temperature (−40°C to +125°C) and load (0.1–0.5 A), enabling direct replacement of 7805 linear regulators without feedback network. |
| Input Voltage Range | 7 V to 60 V - supports wide-input industrial, automotive, and telecom applications where input may vary significantly (e.g., 24V nominal systems with load dump). |
| Output Current | Guaranteed 0.5 A continuous - sufficient for powering microcontrollers, sensors, and logic circuits without external pass transistors. |
| Oscillator Frequency | 52 kHz ±10% - fixed internal frequency simplifies EMI filtering and allows use of low-cost, high-current inductors optimized for this range. |
| Efficiency | 77% at VIN = 12 V, IOUT = 0.5 A - reduces heat dissipation vs. linear regulators, eliminating need for heatsinks in most PCB layouts. |
| Shutdown Current | 50 µA typical (≤200 µA max) - enables ultra-low-power system sleep modes via TTL-level ON/OFF pin control. |
| Thermal Resistance | θJA = 72°C/W with 4 in² copper - defines maximum power dissipation (≈1.1 W at TJ = 125°C ambient) and guides PCB copper area design. |
Pinout & Package
LM2574HVN-5.0/NOPB is housed in an 8-pin plastic DIP (NS package N08A) with exposed pad soldered to PCB for thermal enhancement. Pin 1 is marked by notch or dot; Pin 5 is internally unconnected but must be soldered to ground plane for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 7–60 V DC; requires ≥22 µF electrolytic bypass capacitor placed adjacent to pin. |
| 2 (GND) | Power Ground | Main return path for input, output, and internal switch; must connect to low-impedance ground plane. |
| 3 (OUT) | Switch Node | Drives external inductor; connects to cathode of Schottky catch diode (e.g., SR102 or MBR150). |
| 4 (GND) | Power Ground | Second ground pin - electrically tied internally to Pin 2; improves thermal conduction and reduces ground loop inductance. |
| 5 (NC) | No Internal Connection | Must be soldered to PCB ground plane to enhance thermal performance; not electrically active. |
| 6 (FEEDBACK) | Feedback Input | Not used in fixed-output versions; left open or grounded per datasheet guidance for stability. |
| 7 (ON/OFF) | Shutdown Control | TTL-compatible input: ≤0.8 V = ON, ≥2.4 V = OFF; draws ≤30 µA in shutdown state. |
| 8 (GND) | Power Ground | Third ground pin - completes low-inductance ground return for internal circuitry and switch node. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V Output | Eliminates external resistor divider, reducing BOM count and improving long-term output accuracy (±4% over temp/load). |
| High-Voltage Input Support | 60 V max input enables direct operation from 48V telecom rails or 36V industrial buses without pre-regulation. |
| Integrated Protection | Thermal shutdown and cycle-by-cycle current limiting prevent damage during overload, short-circuit, or high-temperature operation. |
| Low External Component Count | Only four required components (CIN, L, DCATCH, COUT) simplify layout, reduce cost, and improve reliability vs. controller-based solutions. |
| Standard Inductor Compatibility | Optimized for widely available 330 µH inductors (e.g., Pulse PE-52627, Renco RL-1284-330), accelerating design cycle. |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Generating stable 5V for PLC I/O modules powered from 24V DC bus with transient spikes up to 60V. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5V to microcontroller, CAN transceivers, and analog front-ends. Use Value: Withstands automotive load-dump transients (ISO 7637-2 Pulse 5a) due to 60V input rating and internal current limiting. |
Use Scenario: Powering door lock actuators, window lift controllers, and interior lighting drivers in 12V vehicle architecture. IC Role / Device Role / Timing Role: Efficient 5V supply for MCU and sensor interface ICs, replacing less efficient linear regulators. Use Value: 77% efficiency at 12V→5V/0.5A reduces board heating and eliminates need for heatsinks in confined enclosures. |
| Telecom Remote Terminal Units | Embedded Instrumentation Systems |
|
Use Scenario: Providing isolated 5V rail in remote base station equipment powered from −48V DC supply via external DC/DC converter. IC Role / Device Role / Timing Role: Secondary buck regulator converting intermediate 12V or 24V to clean 5V for digital logic and FPGA configuration. Use Value: Fixed 5V output ensures consistent logic-level compatibility across multiple RTU variants without calibration. |
Use Scenario: On-card power conversion for portable test equipment using Li-ion battery (8–12.6V) to power 5V ADCs, op-amps, and display controllers. IC Role / Device Role / Timing Role: Main DC/DC converter enabling extended battery life through high-efficiency regulation. Use Value: 50 µA shutdown current extends battery runtime in sleep mode; DIP-8 package facilitates manual prototyping and rework. |
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 variant's 60V rating; identical pinout, package, and 5V output spec. | Suitable only where input never exceeds 40V; cannot replace LM2574HVN-5.0/NOPB in 48V or load-dump-prone systems. | Select LM2574N-5.0 only if input is strictly limited to ≤40V and cost sensitivity outweighs robustness requirements. |
| LM2596-5.0 | Higher 3A output current, 150 kHz switching frequency, and improved efficiency (≥85%); requires different inductor value and layout. | Better suited for higher-current loads or space-constrained designs needing smaller magnetics; not drop-in compatible. | Choose LM2596-5.0 when >0.5A output or higher efficiency is required; redesign inductor, diode, and capacitors accordingly. |
Compared with LM2574N-5.0, LM2574HVN-5.0/NOPB provides critical 60V input headroom for harsh environments, while LM2596-5.0 offers superior current capability and efficiency at the cost of layout redesign and component substitution.
Availability
LM2574HVN-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom remote terminal units requiring stable component supply with long lifecycle support.
Supply support for LM2574HVN-5.0/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 LM2574HVN-5.0/NOPB belongs to TI's SIMPLE SWITCHER™ buck regulator series, designed specifically for engineers seeking easy-to-use, high-reliability DC/DC conversion with minimal external components and robust protection features.
FAQ
What is the maximum input voltage rating for LM2574HVN-5.0/NOPB?
The LM2574HVN-5.0/NOPB has a maximum input voltage rating of 60 V, as specified in its Absolute Maximum Ratings table. This HV designation distinguishes it from the standard LM2574-5.0 (40 V max), making LM2574HVN-5.0/NOPB suitable for 48V systems and applications subject to transient overvoltages such as automotive load dump. Operation above 60 V risks permanent device damage.
Can LM2574HVN-5.0/NOPB be used in place of a 7805 linear regulator?
Yes, LM2574HVN-5.0/NOPB can replace a 7805 in many applications, delivering the same 5V output but with significantly higher efficiency (77% vs. ~42% at 12V input) and no heatsink requirement. However, unlike the 7805, LM2574HVN-5.0/NOPB requires four external components (inductor, diode, input/output capacitors) and generates switching noise - careful PCB layout and filtering are essential.
What inductor value is recommended for LM2574HVN-5.0/NOPB at 0.5A output?
For LM2574HVN-5.0/NOPB delivering 0.5A at 5V output with typical 12V input, the recommended inductor value is 330 µH - as confirmed by TI's LM2574HV-5.0 inductor selection guide (Figure 5). Validated part numbers include Pulse Engineering PE-52627, Renco RL-1284-330, and NPI NP5920/5921, all rated for ≥1.5×0.5A DC current and 52 kHz operation.
Does LM2574HVN-5.0/NOPB require an external feedback resistor network?
No, LM2574HVN-5.0/NOPB is a fixed-output version and does not require an external feedback resistor network. The 5.0V regulation is implemented internally; the FEEDBACK pin (Pin 6) is unused and should be left open or grounded per TI's application guidance to ensure stability. Only adjustable versions (e.g., LM2574HVN-ADJ) require external resistors.
What is the thermal performance of LM2574HVN-5.0/NOPB in its DIP-8 package?
LM2574HVN-5.0/NOPB in the N08A DIP-8 package has a junction-to-ambient thermal resistance (θJA) of 72°C/W when mounted on a PCB with 4 in² of 1 oz. copper. This allows approximately 1.1 W of power dissipation before reaching the 125°C maximum junction temperature at 25°C ambient - sufficient for typical 0.5A operation at moderate input-output differentials without additional heatsinking.
LM2574HVN-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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):
- 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/NOPB FAQ
1.How can I place an order for LM2574HVN-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVN-5.0/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 LM2574HVN-5.0/NOPB reliable?
The price and inventory of LM2574HVN-5.0/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2574HVN-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVN-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVN-5.0/NOPB?
LM2574HVN-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVN-5.0/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 LM2574HVN-5.0/NOPB?
For technical support, including LM2574HVN-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVN-5.0/NOPB requirements.
6.How does Aetrix verify that LM2574HVN-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2574HVN-5.0/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 LM2574HVN-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2574HVN-5.0/NOPB?
All LM2574HVN-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVN-5.0/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 LM2574HVN-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2574HVN-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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