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onsemi LM2574N-005
- Part No.:
- LM2574N-005
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574N-005.pdf
- Description:
- IC REG BUCK BOOST 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,333
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Product details
Overview
LM2574N-005 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 5-V output with ±4% tolerance over line and load, operating from 7 V to 40 V input, and featuring 52-kHz fixed-frequency operation and TTL-compatible ON/OFF control. It serves as a high-efficiency replacement for linear regulators in embedded power supplies.
For engineers reviewing the LM2574N-005 datasheet, pinout, applications, or equivalent options, key selection considerations include its 0.5-A output capability, 52-kHz oscillator frequency, thermal shutdown protection, 50-μA standby current in shutdown mode, and compatibility with standard off-the-shelf inductors - all critical for cost-sensitive, board-space-constrained buck converter designs.
Technical Context
The LM2574N-005 integrates a PWM controller, power switch, error amplifier, fixed-frequency oscillator, and protection circuitry into a single IC. Its non-synchronous architecture uses an external diode for freewheeling, and regulation is achieved via feedback sensing at the FB pin - shorted to output for fixed 5-V versions. The internal 1.23-V reference enables precise output voltage setting without external resistors in fixed-output variants.
It operates in continuous or discontinuous conduction mode depending on load and inductor value, with cycle-by-cycle current limiting (typ. 1.0 A peak) and thermal shutdown ensuring robust fault handling. The ON/OFF pin provides TTL-level enable/disable control, placing the device in low-power standby (50 μA typical) when pulled high above 1.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V ±4% over full line/load/temperature range - eliminates need for external feedback divider. |
| Max Output Current | 0.5 A DC - supports moderate-power microcontroller, sensor, or logic rails without external pass devices. |
| Input Voltage Range | 7 V to 40 V - suitable for 12-V or 24-V industrial bus inputs with margin for transients. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to MHz-range converters. |
| Standby Current | 50 μA typical - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Saturation Voltage | 1.2 V max at 0.5 A - defines minimum dropout and impacts efficiency at low VIN; requires careful thermal design under full load. |
| Current Limit | 0.7–1.6 A peak - provides overload protection while allowing inrush current for capacitive loads. |
Pinout & Package
LM2574N-005 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 performance is optimized via PWR_GND and SIG_GND pins tied to PCB ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback sense input | Internally connected to output for fixed 5-V version; no external resistor network required. |
| 2 SIG_GND | Signal ground reference | Ground return for internal bandgap reference and error amplifier; must be routed separately from power ground to minimize noise coupling. |
| 3 ON/OFF | Enable/disable control input | TTL-compatible: <1.2 V = active, >1.4 V = shutdown; floating is undefined - must be pulled to GND or VIN via resistor. |
| 4 PWR_GND | Power ground | High-current return path for switch emitter and input/output capacitors; requires low-impedance connection to system ground. |
| 5 VIN | Input supply | Collector connection of internal NPN switch; accepts 7–40 V; requires local 22-μF electrolytic + ceramic bypass near pin. |
| 6–8 NC | No internal connection | Not bonded; may be left unconnected or grounded for mechanical stability and thermal conduction. |
| 7 OUTPUT | Switch emitter output | Drives external inductor and catch diode; high dv/dt node - layout must minimize loop area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity for standard logic rail generation. |
| 52-kHz fixed-frequency oscillator | Enables predictable EMI filtering and simplifies inductor selection using widely available off-the-shelf parts. |
| TTL shutdown with 50-μA standby | Supports system-level power sequencing and ultra-low-quiescent power states without external circuitry. |
| Internal thermal shutdown & current limit | Provides autonomous fault recovery without external monitoring, enhancing reliability in unattended applications. |
| Requires only 4 external components | Minimizes bill-of-materials and PCB footprint: input cap, output cap, inductor, and catch diode - ideal for space-constrained designs. |
Applications
| Industrial Sensor Node Power | Embedded Microcontroller Supply |
|---|---|
Use Scenario: Powering a 32-bit ARM Cortex-M MCU, RS-485 transceiver, and analog temperature/humidity sensor from a 24-V factory bus. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 5-V rail; handles input transients up to 40 V and load steps up to 0.5 A. Use Value: Delivers 77% efficiency at 12-V input/0.5-A load, eliminating need for heatsinking and enabling compact enclosure design. | Use Scenario: On-board 5-V supply for FPGA I/O banks and peripheral interfaces in a programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Pre-regulator feeding low-dropout linear regulators; provides ripple-reduced intermediate rail before final LDO stage. Use Value: Reduces thermal load on downstream LDOs by lowering input-to-output differential, improving overall system efficiency and reliability. |
| Positive-to-Negative Converter | Legacy Equipment Retrofit |
Use Scenario: Generating –5 V from a 12-V source for op-amp biasing in test instrumentation. IC Role / Device Role / Timing Role: Configured in buck-boost topology; OUTPUT pin drives inductor to ground, feedback referenced to negative rail. Use Value: Leverages same IC and external component set as buck mode - avoids dedicated inverting controller, cutting redesign effort. | Use Scenario: Replacing obsolete 7805 linear regulators in aging medical diagnostic equipment with higher-efficiency switching solution. IC Role / Device Role / Timing Role: Drop-in compatible 5-V regulator with identical pinout (VIN, GND, VOUT), requiring only minimal layout changes for inductor/diode addition. Use Value: Reduces board temperature rise by >60% versus linear regulator at 0.4-A load, extending capacitor lifetime and system MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575N-005 | Higher 1-A output rating, 52-kHz frequency, improved line/load regulation (±2%), but larger SOIC-16 or TO-220 packages. | Preferred where higher current headroom or tighter regulation is required; not pin-compatible with PDIP-8 LM2574N-005. | Select LM2575N-005 if future load growth or tighter output tolerance is anticipated; verify PCB pad compatibility and thermal management. |
| MP1584EN-LF-Z | 3-A synchronous buck, 1.5-MHz switching, smaller SOIC-8 package, but requires external compensation and lacks integrated catch diode. | Better suited for compact, high-efficiency designs with >0.5-A loads; incompatible pinout and control interface (EN vs ON/OFF). | Choose MP1584EN-LF-Z for new designs prioritizing size and efficiency; avoid for drop-in LM2574N-005 replacements due to functional and layout differences. |
Compared with LM2575N-005 and MP1584EN-LF-Z, the LM2574N-005 offers the simplest implementation for 0.5-A fixed 5-V conversion with minimal external parts and proven thermal behavior in legacy PDIP layouts - making it optimal for cost-sensitive, reliability-critical, or retrofit applications where design change minimization is essential.
Availability
LM2574N-005 is available at Aetrix Electronics and suitable for industrial sensor nodes, embedded microcontroller supplies, positive-to-negative converters, and legacy equipment retrofits requiring stable component supply and long-term manufacturability.
Supply support for LM2574N-005 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, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.
The LM2574x SIMPLE SWITCHER® product line was designed to simplify DC-DC buck converter design for engineers without power electronics expertise - emphasizing ease of use, minimal external components, and robust protection features for reliable operation in harsh environments.
FAQ
What is the maximum input voltage rating for the LM2574N-005?
The LM2574N-005 has an absolute maximum input voltage rating of 45 V, with recommended operating input voltage ranging from 7 V to 40 V. Exceeding 40 V during normal operation risks reduced reliability and thermal stress; the HV variant (LM2574HV) supports up to 60 V input for higher-voltage applications. Always observe derating guidelines per the datasheet's thermal information table.
Does the LM2574N-005 require an external feedback resistor network?
No, the LM2574N-005 does not require an external feedback resistor network. As a fixed 5-V output version, the FB pin is internally connected to the OUTPUT pin, eliminating the need for external resistors. This simplifies design, improves accuracy by removing resistor tolerance effects, and reduces component count - a key advantage over adjustable variants like the LM2574N-ADJ.
How does the ON/OFF pin function on the LM2574N-005?
The ON/OFF pin on the LM2574N-005 provides TTL-compatible enable/disable control: pulling the pin below 1.2 V (typically to GND) enables regulation, while pulling it above 1.4 V (e.g., to VIN) places the device in shutdown mode with 50-μA typical standby current. The pin must never be left floating - a pull-down resistor to GND ensures default-on behavior, critical for deterministic power-up sequencing in the LM2574N-005.
What thermal considerations apply to the LM2574N-005 in PDIP-8 package?
The LM2574N-005 in PDIP-8 has a junction-to-ambient thermal resistance (RθJA) of 60.4°C/W. At 0.5-A load and 12-V input, power dissipation reaches ~0.6 W, resulting in ~36°C junction rise above ambient - typically manageable with standard copper pours. However, operation near 40-V input or at elevated ambient temperatures requires attention to PWR_GND/SIG_GND grounding and airflow; thermal shutdown activates at 150°C junction temperature.
Can the LM2574N-005 be used in a buck-boost configuration to generate negative output voltages?
Yes, the LM2574N-005 can be configured as a buck-boost converter to generate negative output voltages such as –5 V. In this topology, the OUTPUT pin drives the inductor to ground, the diode anode connects to ground, and feedback is referenced to the negative rail. The LM2574N-005's non-synchronous architecture and robust current limiting make it suitable for this application, though output ripple and efficiency differ from standard buck operation - confirmed in TI's application note SNVA262.
LM2574N-005 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):
- 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
LM2574N-005 FAQ
1.How can I place an order for LM2574N-005 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574N-005 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-005 reliable?
The price and inventory of LM2574N-005 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574N-005 is usually 5 days.
3.What payment methods are accepted for LM2574N-005?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574N-005 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574N-005?
LM2574N-005 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574N-005 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-005?
For technical support, including LM2574N-005 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574N-005 requirements.
6.How does Aetrix verify that LM2574N-005 is sourced from the original manufacturer or authorized distributors?
All LM2574N-005 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-005 meets industry standards.
7.What is the process for return or replacement of LM2574N-005?
All LM2574N-005 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574N-005, 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-005 part is unused and in its original packaging.
Return procedure for LM2574N-005:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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