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onsemi LM2574N-015G
- Part No.:
- LM2574N-015G
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574N-015G.pdf
- Description:
- IC REG BUCK BST 15V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,352
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Product details
Overview
LM2574N-015G from Texas Instruments is a monolithic 0.5-A non-synchronous step-down (buck) DC-DC switching regulator in PDIP-8 package, delivering a fixed 15-V output with ±4% tolerance over line and load, 40-V max input voltage, and 52-kHz fixed-frequency operation. It integrates oscillator, error amplifier, current-limit protection, thermal shutdown, and TTL-compatible ON/OFF control - used in industrial power supplies, embedded system preregulators, and on-card buck converters.
For engineers reviewing the LM2574N-015G datasheet, pinout, applications, or equivalent options, key selection criteria include its 15-V fixed output, 0.5-A continuous load capability, 40-V input rating, thermal shutdown behavior, and PDIP-8 layout compatibility with legacy through-hole designs.
Technical Context
The LM2574N-015G implements a fixed-frequency, pulse-width modulation (PWM) buck topology using an internal NPN transistor switch with cycle-by-cycle current limiting and thermal foldback. Its feedback loop references a precise 1.23-V internal bandgap, but for the fixed-15V version, the FB pin is internally tied to output - eliminating external resistor dividers.
It operates in discontinuous or continuous conduction mode depending on load and inductor value, with built-in undervoltage lockout (UVLO) preventing startup below ~4.75 V and TTL-level ON/OFF control enabling low-power standby (50 µA typical quiescent current).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% - ensures stable rail for analog front-ends or logic interfaces without external feedback components. |
| Max Output Current | 0.5 A continuous - supports moderate-power loads such as microcontroller peripherals or sensor signal chains. |
| Input Voltage Range | 4.75 V to 40 V - accommodates wide-input industrial or automotive-derived supplies without pre-regulation. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Efficiency | 88% at VIN = 18 V, IOUT = 0.5 A - significantly reduces heat dissipation versus linear regulators in same applications. |
| Standby Current | 50 µA typical - allows low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Shutdown | Active at TJ ≥ 150°C - protects device during overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
LM2574N-015G uses an 8-pin PDIP (Plastic Dual In-line Package) with 6.35 mm × 9.81 mm body size and through-hole mounting. Thermal resistance RθJA is 60.4°C/W on standard JEDEC 2-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback sense input | Internally connected to output for fixed-15V version; no external divider required. |
| 2 SIG_GND | Signal ground reference | Ground for internal bandgap, error amp, and logic - must be short-traced to PWR_GND at single point. |
| 3 ON/OFF | Enable control input | TTL-compatible: ≤1.2 V = active, ≥2.2 V = shutdown; 50 µA standby draw when high. |
| 4 PWR_GND | Power ground return | High-current return path for switch emitter and input/output capacitors - minimize trace inductance. |
| 5 VIN | Input supply connection | Accepts 4.75–40 V DC; requires local 22-µF electrolytic + optional ceramic bypass near pin. |
| 6–8 NC | No internal connection | Not bonded; may be left unconnected or grounded for mechanical stability and thermal transfer. |
| 7 OUTPUT | Switch emitter node | Drives external diode cathode and inductor - high dv/dt node requiring tight layout and snubber if needed. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity for dedicated 15-V rails. |
| Integrated current limit | Peak switch current limited to 0.7–1.6 A - prevents destructive overloads without external sensing. |
| TTL shutdown interface | Direct microcontroller GPIO control with <200 µA input current - enables system-level power sequencing. |
| Self-contained compensation | No external compensation network required - simplifies design and improves production consistency. |
| Thermal protection | Junction temperature cutoff at 150°C with hysteresis - prevents permanent damage during sustained overload or ambient rise. |
Applications
| Industrial Power Supply | Embedded System Preregulator |
|---|---|
Use Scenario: Converting 24-V DC field bus to regulated 15-V for analog instrumentation modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient 15-V rail with minimal external parts. Use Value: Replaces linear regulators to avoid >5 W thermal dissipation at 0.5 A, enabling compact enclosure design. | Use Scenario: Generating 15-V intermediate rail before LDOs feed FPGA I/O banks or ADC drivers. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing dropout and heat before precision low-noise linear regulation. Use Value: Enables 88% efficiency at 18-V input, cutting total system power loss by >60% vs. linear alternative. |
| On-Card Buck Converter | Positive-to-Negative Converter |
Use Scenario: Local 15-V generation on motor control PCB where 40-V bus powers gate drivers and logic. IC Role / Device Role / Timing Role: Compact, through-hole mounted buck stage minimizing routing losses and EMI coupling. Use Value: PDIP-8 footprint allows manual rework and compatibility with legacy assembly lines. | Use Scenario: Deriving –15-V rail from +15-V output using buck-boost topology with LM2574N-015G. IC Role / Device Role / Timing Role: Switching controller repurposed in inverted configuration to generate negative voltage. Use Value: Leverages same 52-kHz oscillator and current limit for predictable performance in inverting applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574HVN-15 | Higher 60-V input rating; otherwise identical 15-V output, pinout, and specs. | Suitable for 48-V telecom or industrial buses where transient spikes exceed 40 V. | Select when input transients or long cable drops require >40-V headroom. |
| LM2596-15 | 3-A output, 150-kHz frequency, improved efficiency (up to 92%), but different pinout and external compensation. | Requires redesign of inductor, diode, and feedback network; not drop-in compatible. | Choose for higher current or better efficiency where layout revision is acceptable. |
Compared with LM2574HVN-15, the LM2574N-015G trades input voltage headroom for cost and legacy compatibility; compared with LM2596-15, it offers simpler implementation and proven reliability in established designs but lower current and efficiency.
Availability
LM2574N-015G is available at Aetrix Electronics and suitable for industrial power supplies, embedded system preregulators, and on-card buck converters requiring stable component supply across extended product lifecycles.
Supply support for LM2574N-015G 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 is a global semiconductor company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer markets.
The LM2574x SIMPLE SWITCHER® series was developed to provide robust, easy-to-use buck regulators with minimal external components - targeting cost-sensitive, reliability-critical applications in industrial controls and legacy equipment.
FAQ
What is the maximum input voltage rating for LM2574N-015G?
The LM2574N-015G has a maximum input voltage rating of 40 V, as specified in its absolute maximum ratings table. This applies across the full operating temperature range. Exceeding this voltage risks permanent damage. The HV variant (LM2574HVN-15) supports up to 60 V input but is not pin-compatible with the standard LM2574N-015G.
Does LM2574N-015G require external feedback resistors?
No, the LM2574N-015G does not require external feedback resistors. As a fixed-output version, its FB pin is internally connected to the 15-V output node. External resistor networks are only needed for the adjustable version (LM2574N-ADJ), making the LM2574N-015G ideal for simplified, low-component-count designs.
What is the typical quiescent current of LM2574N-015G in shutdown mode?
The typical quiescent current of LM2574N-015G in shutdown mode is 50 µA, with a maximum of 200 µA over temperature. This low standby draw is achieved when the ON/OFF pin voltage exceeds 2.2 V, enabling energy-efficient power gating in battery-backed or always-on systems using the LM2574N-015G.
Can LM2574N-015G be used in a buck-boost (inverting) configuration?
Yes, LM2574N-015G can be used in a positive-to-negative buck-boost configuration, as confirmed in TI's official documentation. In this topology, the OUTPUT pin drives the inductor, and the VIN pin becomes the negative output node. The 52-kHz oscillator and current limit remain functional, though output voltage regulation accuracy and ripple differ from standard buck operation.
What package type and thermal characteristics apply to LM2574N-015G?
The LM2574N-015G is supplied in an 8-pin PDIP (plastic dual in-line package) with 6.35 mm × 9.81 mm body size. Its junction-to-ambient thermal resistance (RθJA) is 60.4°C/W on a standard 2-layer JEDEC board. Adequate copper area on PWR_GND and short traces to input/output capacitors are essential to maintain safe operating temperature under 0.5-A load.
LM2574N-015G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- 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
LM2574N-015G FAQ
1.How can I place an order for LM2574N-015G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574N-015G 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 LM2574N-015G reliable?
The price and inventory of LM2574N-015G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574N-015G is usually 5 days.
3.What payment methods are accepted for LM2574N-015G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574N-015G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574N-015G?
LM2574N-015G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574N-015G 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 LM2574N-015G?
For technical support, including LM2574N-015G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574N-015G requirements.
6.How does Aetrix verify that LM2574N-015G is sourced from the original manufacturer or authorized distributors?
All LM2574N-015G 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 LM2574N-015G meets industry standards.
7.What is the process for return or replacement of LM2574N-015G?
All LM2574N-015G units undergo pre-shipment inspection (PSI). If there is an issue with LM2574N-015G, 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 LM2574N-015G part is unused and in its original packaging.
Return procedure for LM2574N-015G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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