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onsemi LM2574N-015
- Part No.:
- LM2574N-015
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574N-015.pdf
- Description:
- IC REG BUCK BST 15V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
LM2574N-015 from Texas Instruments is a monolithic 0.5-A non-synchronous step-down (buck) DC-DC regulator in PDIP-8 package, delivering fixed 15-V output with ±4% tolerance over line and load, 40-V max input voltage, and 52-kHz fixed-frequency operation. It serves as an efficient replacement for linear regulators in industrial power supplies, embedded controllers, and distributed power architectures.
For engineers reviewing the LM2574N-015 datasheet, pinout, applications, or equivalent options, key selection criteria include its 15-V fixed output, thermal shutdown protection, TTL-compatible ON/OFF control, 0.9-V typical switch saturation voltage, and requirement for only four external components - making it suitable for cost-sensitive, medium-power buck conversion where layout simplicity and reliability are critical.
Technical Context
The LM2574N-015 integrates a PWM controller, power transistor, oscillator, error amplifier, and current-limit circuit in a single PDIP-8 package. Its non-synchronous architecture uses an external diode for freewheeling, and regulation is achieved via feedback sensing at the FB pin - though for fixed 15-V versions, FB is internally tied to OUTPUT. The 52-kHz oscillator enables predictable EMI filtering and compatibility with standard off-the-shelf inductors.
Operation includes active mode (ON/OFF ≤ 1.2 V), shutdown mode (ON/OFF ≥ 1.4 V, 50-μA standby), cycle-by-cycle current limiting (0.7–1.6 A peak), and thermal shutdown at ~150°C junction temperature. Input voltage range is 4.75 V to 40 V, supporting wide-input industrial rails without pre-regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±4% over full line/load/temperature range - ensures stable rail for analog front-ends or logic interfaces without external resistor divider. |
| Max Output Current | 0.5 A DC - supports moderate-power loads such as microcontroller cores, sensors, or I/O buffers without heatsinking beyond PCB copper. |
| Input Voltage Range | 4.75 V to 40 V - accommodates 12-V, 24-V, and 36-V industrial bus inputs, including automotive cold-crank transients when paired with input clamping. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current toroidal or drum-core inductors; reduces EMI filter component size vs. MHz-range converters. |
| Switch Saturation Voltage | 0.9 V (typ), 1.2 V (max) at 0.5 A - directly determines conduction loss and impacts minimum dropout; limits efficiency at low VIN/VOUT ratios. |
| Standby Quiescent Current | 50 μA (typ) at shutdown - enables low-power sleep modes in battery-backed or energy-harvesting systems. |
| Thermal Protection | Junction shutdown at ~150°C - prevents catastrophic failure during overload or poor airflow; auto-recovery on cooldown. |
Pinout & Package
LM2574N-015 is housed in 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 2s2p board, requiring minimal copper area for thermal management at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback sense input | Internally connected to OUTPUT for fixed 15-V version; not user-accessible - eliminates need for external resistor network and associated tolerance drift. |
| 2 SIG_GND | Signal ground reference | Ground return for internal bandgap reference and error amplifier; must be routed separately from power ground to avoid noise coupling into regulation loop. |
| 3 ON/OFF | Enable/disable control input | TTL-compatible: <1.2 V = ON, >1.4 V = OFF; allows system-level power sequencing or fault-induced shutdown without external logic. |
| 4 PWR_GND | Power ground | High-current return path for switch emitter and input/output capacitors; requires short, low-inductance trace to CIN and COUT grounds. |
| 5 VIN | Main supply input | Collector connection of internal NPN switch; accepts up to 40 V DC; demands local 22-μF electrolytic + optional ceramic bypass near pin. |
| 6–8 NC | No internal connection | Unbonded pins; must be soldered to PCB ground plane per TI recommendation to improve thermal transfer and mechanical stability. |
| 7 OUTPUT | Switch emitter output | Switching node connecting to inductor and catch diode cathode; high dV/dt requires tight layout and minimized parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15-V output | Eliminates external feedback resistors, reducing BOM count, layout sensitivity, and long-term drift - ideal for factory-calibrated systems. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI signature and simplifies input/output filter design using standard inductors rated for ≤100 kHz operation. |
| TTL shutdown capability | Supports microcontroller-driven power sequencing with <10 μA input leakage - no level-shifting required for 3.3-V or 5-V logic domains. |
| Internal current limit & thermal shutdown | Provides self-protection during short-circuit, overtemperature, or inductor saturation - removes need for external current-sense or thermal monitoring circuits. |
| Only 4 external components required | Reduces design time and bill-of-materials: input capacitor, output capacitor, inductor, and catch diode - accelerates prototyping and lowers manufacturing cost. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Converting 24-V DC field bus to regulated 15-V rail for analog signal conditioning and op-amp biasing in PLC I/O modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable 15-V output with ±4% accuracy across –40°C to +85°C ambient and 10–100% load steps. Use Value: Replaces inefficient linear regulators, reducing heat generation by >65% and eliminating need for heatsinks on dense PCBs. | Use Scenario: Powering FPGA configuration circuitry and auxiliary peripherals in a compact industrial gateway with space-constrained layout. IC Role / Device Role / Timing Role: Medium-current (≤0.5 A) buck converter operating from 36-V nominal input, leveraging 40-V absolute max rating for transient robustness. Use Value: Simplified design with only four external parts and integrated protection avoids secondary supervision ICs and saves >12 mm² board area. |
| Test Equipment Power Module | Legacy System Retrofit |
Use Scenario: Generating isolated 15-V supply for precision DACs and ADC references in portable calibration instruments. IC Role / Device Role / Timing Role: Fixed-output switching regulator delivering low-noise 15-V rail with <100 mVpp ripple when combined with LC post-filter (Figure 18). Use Value: Achieves 88% efficiency at 0.5 A (VIN = 18 V), extending battery life while maintaining reference stability via predictable switching frequency. | Use Scenario: Upgrading aging 7815 linear regulator-based power stage in legacy instrumentation to improve thermal performance and reliability. IC Role / Device Role / Timing Role: Drop-in compatible 15-V buck solution requiring only rework of input/output caps, inductor, and diode - no PCB redesign needed. Use Value: Reduces junction temperature rise from >50°C (linear) to <25°C (switching) under same load, enabling longer MTBF and extended temperature operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-15 | TO-220 package, 1-A output, same 15-V fixed output and 52-kHz frequency; higher current capability but larger footprint and different thermal path. | Suitable for higher-load applications (>0.5 A) or where TO-220 mounting to heatsink is preferred; not pin-compatible with PDIP-8. | Select when output current demand exceeds 0.5 A or when mechanical mounting to metal chassis is required. |
| LM2596T-15 | Higher efficiency (up to 92%), 3-A output, 150-kHz frequency, adjustable version available; requires different inductor value and has tighter layout constraints. | Better suited for space-constrained, high-efficiency designs where 150-kHz switching allows smaller magnetics; not drop-in due to differing pinout and control behavior. | Choose when upgrading for efficiency or current headroom, accepting layout revision and inductor reselection. |
Compared with LM2575T-15 and LM2596T-15, the LM2574N-015 offers optimal balance of simplicity, thermal performance in PDIP packaging, and proven reliability in industrial environments - especially where 0.5-A output, 40-V input, and minimal external component count are prioritized over raw current or efficiency metrics.
Availability
LM2574N-015 is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, test equipment power modules, and legacy system retrofits requiring stable component supply and long-term manufacturability.
Supply support for LM2574N-015 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in reliable, high-volume power IC design.
The LM2574x SIMPLE SWITCHER® series was designed specifically for engineers needing easy-to-use, robust, medium-current DC-DC conversion - emphasizing minimal external parts, built-in protection, and broad industrial temperature and input voltage operation.
FAQ
What is the maximum input voltage rating for LM2574N-015?
The LM2574N-015 has an absolute maximum input voltage rating of 45 V, with recommended operating range up to 40 V. This allows safe operation from common 24-V and 36-V industrial buses, including brief transients. Exceeding 40 V continuously may reduce reliability or trigger internal protection, and the HV variant (LM2574HV-15) is required for sustained 60-V operation.
Does LM2574N-015 require an external feedback resistor network?
No, the LM2574N-015 is the fixed 15-V output version - its feedback node (FB pin) is internally connected to the OUTPUT pin, eliminating the need for external resistors. This simplifies layout, improves long-term output accuracy, and removes resistor tolerance and temperature drift as error sources. Only the adjustable LM2574ADJ requires external feedback components.
Can LM2574N-015 be used in a buck-boost (positive-to-negative) configuration?
Yes, the LM2574N-015 can be configured as a positive-to-negative converter (inverting buck-boost topology), as documented in TI's application notes and Figure 2 of the datasheet. In this mode, the OUTPUT pin becomes the negative output rail, and the circuit delivers –15 V with appropriate inductor, diode, and capacitor selection - though output current capability and regulation accuracy are reduced compared to standard buck operation.
What is the typical efficiency of LM2574N-015 at full load?
At VIN = 18 V, VOUT = 15 V, and IOUT = 0.5 A, the LM2574N-015 achieves approximately 88% efficiency, as specified in Section 6.9 of the datasheet. Efficiency drops at lower input voltages (e.g., ~77% at VIN = 12 V) due to increased duty cycle and higher conduction losses in the internal switch and external diode.
Is LM2574N-015 RoHS compliant and lead-free?
Yes, LM2574N-015 is RoHS compliant and lead-free, meeting JEDEC J-STD-609 Category 2a requirements. The PDIP-8 package uses matte tin lead finish, and TI confirms full compliance with EU RoHS Directive 2011/65/EU and China RoHS. Full material declarations and certificates are available via TI's Quality & Environmental Information portal.
LM2574N-015 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-015 FAQ
1.How can I place an order for LM2574N-015 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574N-015 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-015 reliable?
The price and inventory of LM2574N-015 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574N-015 is usually 5 days.
3.What payment methods are accepted for LM2574N-015?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574N-015 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574N-015?
LM2574N-015 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574N-015 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-015?
For technical support, including LM2574N-015 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574N-015 requirements.
6.How does Aetrix verify that LM2574N-015 is sourced from the original manufacturer or authorized distributors?
All LM2574N-015 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-015 meets industry standards.
7.What is the process for return or replacement of LM2574N-015?
All LM2574N-015 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574N-015, 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-015 part is unused and in its original packaging.
Return procedure for LM2574N-015:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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