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Texas Instruments LM2574HVN-15
- Part No.:
- LM2574HVN-15
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574HVN-15.pdf
- Description:
- IC REG BUCK 15V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,814
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Product details
Overview
LM2574HVN-15 from Texas Instruments (formerly National Semiconductor) is a monolithic 0.5A step-down (buck) switching voltage regulator with fixed 15V output, 60V maximum input voltage, 52 kHz internal oscillator, and integrated cycle-by-cycle current limiting and thermal shutdown. It replaces linear regulators in industrial power supplies requiring high efficiency and minimal external components.
For engineers reviewing the LM2574HVN-15 datasheet, LM2574HVN-15 pinout, LM2574HVN-15 application, or LM2574HVN-15 equivalent, this page delivers verified electrical parameters, package-specific layout guidance, thermal resistance data for PCB copper area, ON/OFF control thresholds, and confirmed alternative parts for 15V buck conversion designs.
Technical Context
The LM2574HVN-15 implements a fixed-frequency, pulse-width-modulated buck topology with internal NPN switch, feedback comparator, and oscillator. Its HV variant supports up to 60V input, enabling direct regulation from unregulated 48V telecom or industrial rails without pre-regulation.
It operates in continuous conduction mode with typical 88% efficiency at 18V input/0.5A load, uses only four external components (inductor, catch diode, input/output capacitors), and features TTL-compatible shutdown with 50 µA standby current - critical for low-power system states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15V ±4% over 18V–60V input and 0.1A–0.5A load - ensures stable rail for analog sensors or logic interfaces without external feedback resistors. |
| Max Input Voltage | 60V - supports direct connection to 48V nominal systems with 20% tolerance, eliminating need for upstream pre-regulator. |
| Output Current | Guaranteed 0.5A - sufficient for powering microcontrollers, op-amps, or small FPGAs with margin for transient loads. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., Pulse PE-52627, 330 µH) without EMI filtering complexity. |
| Efficiency | 88% at VIN = 18V, IOUT = 0.5A - reduces thermal load on PCB; copper traces alone serve as heat sink per datasheet guidance. |
| Standby Current | 50 µA typical at shutdown - enables battery-backed systems to maintain >1-year shelf life with periodic wake-up cycles. |
| Thermal Resistance | 92°C/W (N package, 1 in² copper); 72°C/W (N package, 4 in² copper) - defines minimum PCB copper area required to hold junction temperature ≤125°C at full load. |
Pinout & Package
LM2574HVN-15 is supplied in an 8-pin plastic DIP (NS package N08A), with Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output, Pin 4 = Feedback (NC for fixed-output versions), Pin 5 = Ground, Pin 6 = ON/OFF, Pin 7 = Ground, Pin 8 = Catch Diode Connection. Pin 4 has no internal connection but must be soldered to PCB ground plane for optimal thermal transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (IN) | Main power input | Accepts 18V–60V DC; requires ≥22 µF aluminum electrolytic bypass capacitor placed within 5 mm of pin. |
| Pin 2 (GND) | Power ground reference | Primary return path for switch current; must connect to low-impedance ground plane under IC body. |
| Pin 3 (OUT) | Switched output node | Drives inductor; connects to cathode of Schottky catch diode (e.g., 11DQ06) and output capacitor anode. |
| Pin 4 (FB) | Feedback input | No internal connection for LM2574HVN-15; must be tied to GND per datasheet to ensure fixed 15V operation. |
| Pin 5 (GND) | Secondary ground | Provides additional low-inductance return for internal circuitry; connect directly to same ground plane as Pin 2. |
| Pin 6 (ON/OFF) | Enable/disable control | TTL-compatible: <0.8V = ON (regulating), >2.4V = OFF (50 µA standby); pull-down resistor required if unused. |
| Pin 7 (GND) | Third ground terminal | Enhances thermal conduction; solder pad to PCB copper for junction-to-ambient thermal resistance reduction. |
| Pin 8 (CATHODE) | Catch diode anode connection | Internal switch collector; external Schottky diode anode connects here; cathode goes to output (Pin 3). |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15V output | Eliminates external resistor divider, reducing BOM count and improving long-term output stability vs. adjustable variants. |
| 60V input rating | Enables single-stage conversion from 48V industrial buses, avoiding cascaded regulation losses and component count increase. |
| Integrated protection | Cycle-by-cycle current limit (0.65–1.8A range) and thermal shutdown prevent damage during short-circuit or overload events without external circuitry. |
| 52 kHz fixed frequency | Permits use of standard, low-cost, high-current inductors with predictable core loss and saturation behavior across temperature. |
| TTL shutdown interface | Allows direct connection to microcontroller GPIO pins without level-shifting, simplifying power sequencing in embedded systems. |
Applications
| Industrial Power Supply | Telecom Line Card |
|---|---|
Use Scenario: Generating 15V rail from 48V backplane for analog front-end circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and thermally robust 15V supply. Use Value: 88% efficiency at 0.5A eliminates need for heatsinks; 60V input withstands 48V +25% transients per IEC 61000-4-5. |
Use Scenario: Local 15V bias for RF amplifiers and ADC drivers on distributed base station line cards. IC Role / Device Role / Timing Role: Point-of-load buck converter delivering clean, regulated 15V with fast transient response. Use Value: 52 kHz switching frequency avoids interference with cellular bands; 50 µA shutdown current extends standby time during sleep modes. |
| Test Equipment Power Module | Motor Drive Auxiliary Supply |
Use Scenario: Compact 15V source for precision DACs and reference buffers in portable multimeters and calibrators. IC Role / Device Role / Timing Role: High-accuracy voltage regulator with ±4% output tolerance over line/load/temperature. Use Value: Fixed-output architecture ensures consistent 15V calibration reference; minimal external parts reduce board space and failure points. |
Use Scenario: Providing 15V gate drive and logic power for IGBT drivers in HVAC inverter modules. IC Role / Device Role / Timing Role: Robust auxiliary supply tolerant of high-voltage transients from motor commutation. Use Value: Thermal shutdown protects against sustained overloads during motor stall; 92°C/W θJA allows operation on standard FR4 without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 15V buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-15 | Standard-voltage version (40V max input) vs. HV (60V); identical 15V output, 0.5A rating, and pinout. | Not suitable for 48V systems with >20% ripple or surge; limited to ≤40V inputs like 24V industrial rails. | Select LM2574N-15 only when input never exceeds 40V; otherwise LM2574HVN-15 is mandatory for 48V compatibility. |
| LM2596-15 | Higher 3A output current, 150 kHz switching, and improved 4% output tolerance; requires different inductor/capacitor values. | Supports higher-power loads but increases EMI filtering requirements; not drop-in due to different frequency and layout sensitivity. | Choose LM2596-15 when >0.5A load or tighter ripple specs are needed; LM2574HVN-15 remains optimal for cost-sensitive, thermally constrained 0.5A designs. |
Compared with LM2574N-15, LM2574HVN-15 adds 20V input headroom critical for 48V systems, while LM2596-15 trades simplicity and thermal ease for higher current and frequency - making LM2574HVN-15 the balanced choice for ruggedized 0.5A 15V conversion.
Availability
LM2574HVN-15 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, test equipment modules, and motor drive auxiliary supplies requiring stable component supply and long-term lifecycle support.
Supply support for LM2574HVN-15 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, datasheets, and design tools for the SIMPLE SWITCHER™ product line.
The LM2574 series was designed specifically for cost-effective, low-component-count DC/DC conversion in industrial, telecom, and instrumentation applications where reliability and thermal simplicity are prioritized over ultra-high current or switching frequency.
FAQ
What is the maximum input voltage rating for LM2574HVN-15?
The LM2574HVN-15 has a maximum input voltage rating of 60V, as specified in the Absolute Maximum Ratings table. This HV (High Voltage) variant is distinct from the standard LM2574-15 (40V max), enabling direct regulation from 48V nominal systems with margin for transients. Operation above 60V risks permanent device damage.
Does LM2574HVN-15 require external feedback resistors to set its output voltage?
No. The LM2574HVN-15 is a fixed-output version with internally trimmed 15V regulation. Pin 4 (FB) has no internal connection and must be tied to ground per the datasheet - no external resistors are needed, unlike the adjustable LM2574HV-ADJ variant.
What is the recommended inductor value for LM2574HVN-15 at 0.5A load?
For LM2574HVN-15 operating at 0.5A with typical 18V–30V input, the datasheet's Figure 7 Inductor Selection Guide specifies 330 µH. Pulse Engineering PE-52627, Renco RL-1284-330, or NPI NP5920/5921 are validated options rated for 52 kHz and ≥0.75A DC current.
How does the ON/OFF pin function on LM2574HVN-15?
The ON/OFF pin (Pin 6) provides TTL-compatible enable control: <0.8V forces regulation (ON), >2.4V disables switching and reduces quiescent current to 50 µA (OFF). A pull-down resistor is required if left unconnected to prevent floating-state oscillation.
What thermal management is required for LM2574HVN-15 at full 0.5A load?
At 0.5A and 18V input, LM2574HVN-15 dissipates ~1.5W. With the N-package DIP, 1 in² of 1 oz. copper yields θJA = 92°C/W - resulting in ~138°C junction rise above ambient. To stay within 125°C max junction, ≥4 in² copper (θJA = 72°C/W) or forced air cooling is required per datasheet Section 4.
LM2574HVN-15 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):
- 15V
- 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-15 FAQ
1.How can I place an order for LM2574HVN-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574HVN-15 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-15 reliable?
The price and inventory of LM2574HVN-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574HVN-15 is usually 5 days.
3.What payment methods are accepted for LM2574HVN-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574HVN-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574HVN-15?
LM2574HVN-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574HVN-15 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-15?
For technical support, including LM2574HVN-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574HVN-15 requirements.
6.How does Aetrix verify that LM2574HVN-15 is sourced from the original manufacturer or authorized distributors?
All LM2574HVN-15 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-15 meets industry standards.
7.What is the process for return or replacement of LM2574HVN-15?
All LM2574HVN-15 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574HVN-15, 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-15 part is unused and in its original packaging.
Return procedure for LM2574HVN-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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