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onsemi LM2574N-005G
- Part No.:
- LM2574N-005G
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574N-005G.pdf
- Description:
- IC REG BUCK BOOST 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,881
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Product details
Overview
LM2574N-005G 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 internal oscillator and TTL-compatible ON/OFF control. It serves as an efficient replacement for linear regulators in industrial power supplies, embedded controllers, and on-card voltage conversion.
For engineers reviewing the LM2574N-005G datasheet, pinout, applications, or equivalent options, key selection considerations include its 0.5-A output capability, thermal shutdown and cycle-by-cycle current limiting, 77% efficiency at 12-V input/0.5-A load, and minimal external component count (only 4 required).
Technical Context
The LM2574N-005G implements a fixed-frequency PWM buck topology with internal oscillator, error amplifier, and 0.5-A NPN switch. Its feedback loop uses the FB pin tied directly to output for fixed 5-V regulation, eliminating external resistors. The ON/OFF pin enables TTL-level shutdown with 50-μA standby current.
It integrates undervoltage lockout, thermal shutdown, and peak-current limiting-each independently active during fault conditions. The device operates in continuous conduction mode under typical loads but transitions to discontinuous mode at light loads without instability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V ±4% over full temperature and load range-ensures stable logic supply without trimming. |
| Max Output Current | 0.5 A DC-supports microcontroller cores, sensors, and interface ICs without external boost stages. |
| Input Voltage Range | 7 V to 40 V-enables direct operation from unregulated 12-V or 24-V rails, including automotive battery inputs. |
| Oscillator Frequency | 52 kHz ±10%-low EMI profile compatible with standard off-the-shelf inductors and reduces filter size vs. MHz-class converters. |
| Efficiency | 77% at VIN = 12 V, IOUT = 0.5 A-reduces thermal load; PCB copper traces suffice as heat sink under typical conditions. |
| Standby Current | 50 μA typical at ON/OFF = high-enables low-power sleep modes in battery-backed systems. |
| Thermal Protection | Internal thermal shutdown-prevents damage during sustained overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
LM2574N-005G is housed in an 8-pin PDIP (Plastic Dual In-line Package) with body size 6.35 mm × 9.81 mm, optimized for through-hole prototyping and industrial PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback sense input | Internally connected to output for fixed 5-V version-no external divider required; simplifies layout and improves regulation accuracy. |
| 2 SIG_GND | Signal ground reference | Ground return for internal bandgap reference and error amplifier-must be tied to system ground with low-impedance path. |
| 3 ON/OFF | Enable/disable control input | TTL-compatible: <1.2 V = ON, >1.4 V = OFF; allows microcontroller-driven power sequencing or fault-initiated shutdown. |
| 4 PWR_GND | Power ground | High-current return path for switch emitter and input/output capacitors-requires short, wide trace to minimize noise and voltage drop. |
| 5 VIN | Main power input | Accepts 7–40 V DC; must be bypassed with ≥22-μF electrolytic capacitor placed adjacent to pin to suppress switching transients. |
| 6–8 NC | No internal connection | Not bonded internally; may be left unconnected or grounded for mechanical stability-no electrical function. |
| 7 OUTPUT | Switch emitter node | Drives external inductor and catch diode; high dv/dt node requiring careful routing away from sensitive analog traces. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output | Eliminates external feedback resistors-reduces BOM count, layout area, and calibration drift over temperature. |
| 52-kHz fixed oscillator | Enables use of low-cost, high-saturation-current toroidal or drum-core inductors-avoids expensive RF-grade magnetics. |
| TTL shutdown | Supports precise power-state control with microcontroller GPIO-no level-shifting needed for 3.3-V or 5-V logic domains. |
| Thermal + current protection | Independent dual-fault coverage prevents latch-up or destruction during short-circuit, overtemperature, or startup surge events. |
| 4-component solution | Requires only input cap, output cap, inductor, and catch diode-accelerates design cycle and reduces sourcing complexity. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Converting unregulated 24-V factory bus to clean 5-V rail for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated 5-V supply with ripple <100 mVpp under 0.4-A load. Use Value: Replaces inefficient 7805 linear regulator-cuts board-level heat by >70% and eliminates need for heatsink. | Use Scenario: On-board power for ARM Cortex-M4 MCU, SPI flash, and CAN transceiver in compact edge-node hardware. IC Role / Device Role / Timing Role: Single-chip buck converter delivering 5-V at up to 0.5-A with integrated enable control for firmware-managed power states. Use Value: Enables deep-sleep mode via ON/OFF pin-reducing system standby power to <100 μW while retaining fast wake-up. |
| Automotive Body Control | Test & Measurement Equipment |
Use Scenario: Powering door-lock actuators and interior lighting controllers from 12-V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Input-stage buck regulator accepting 7–40 V input range-including 6-V cranking dips and 16-V alternator surges. Use Value: Maintains regulation down to 7-V input-avoids brownout resets during engine start without auxiliary LDO staging. | Use Scenario: Lab-grade bench power module generating stable 5-V output for calibrating DMMs and signal generators. IC Role / Device Role / Timing Role: Fixed-output switching regulator with <±4% output tolerance and <0.5% load regulation-meets Class II metrology requirements. Use Value: Delivers 77% efficiency at full load-minimizes self-heating-induced voltage drift during extended calibration runs. |
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-5.0 | Higher 1-A output rating, 52-kHz frequency, same PDIP-8 package-but requires larger inductor and has higher quiescent current (11 mA vs. 10 mA). | Preferred where >0.5-A load margin or future scalability is needed; less optimal for space-constrained 0.5-A designs. | Select LM2575N-5.0 only if peak load exceeds 0.55 A or long-term design headroom is critical. |
| MP1584EN-LF-Z | 2-A synchronous buck, 1.5-MHz switching, SOIC-8-higher efficiency (>85%) and smaller external components, but no built-in thermal/current protection. | Suitable for compact, high-efficiency consumer devices; not recommended for safety-critical or unattended industrial use without added fault monitoring. | Choose MP1584EN-LF-Z when board area and efficiency outweigh robustness requirements-and external protection circuitry is acceptable. |
Compared with LM2575N-5.0, LM2574N-005G offers tighter thermal management and lower BOM cost for 0.5-A applications; versus MP1584EN-LF-Z, it trades higher efficiency for integrated fault protection and simpler qualification in industrial environments.
Availability
LM2574N-005G is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, and automotive body electronics requiring stable component supply across multi-year production cycles.
Supply support for LM2574N-005G 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 designing analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM2574x SIMPLE SWITCHER® series was developed to simplify DC-DC power design for engineers needing reliable, low-component-count buck regulators in cost-sensitive industrial and embedded applications.
FAQ
What is the maximum input voltage rating for the LM2574N-005G?
The LM2574N-005G has an absolute maximum input voltage of 45 V, with recommended operating range from 7 V to 40 V. Exceeding 40 V continuously risks reduced reliability and thermal stress; the HV variant (LM2574HV) supports up to 60 V input for higher-voltage applications.
Does the LM2574N-005G require external feedback resistors to set its output voltage?
No. The LM2574N-005G is the fixed 5-V version-its FB pin is internally connected to the output stage, so no external resistor divider is needed. This differs from the adjustable LM2574N-ADJ, which requires two external resistors to program VOUT between 1.23 V and 37 V.
How does the ON/OFF pin function on the LM2574N-005G?
The ON/OFF pin provides TTL-compatible enable control: pulling it below 1.2 V (typically to GND) enables regulation, while raising it above 1.4 V disables the switcher and reduces quiescent current to 50 μA typical. The pin must never be left floating-it should be actively driven or pulled down with a resistor.
What is the typical efficiency of the LM2574N-005G at full load?
At VIN = 12 V and IOUT = 0.5 A, the LM2574N-005G achieves 77% typical efficiency. Efficiency rises with higher input-to-output voltage ratios (e.g., 88% at 15-V input/12-V output) and falls at light loads due to fixed switching losses dominating conduction losses.
Can the LM2574N-005G be used in a buck-boost configuration?
Yes-the LM2574N-005G can be configured as a positive-to-negative converter (inverting buck-boost) per TI's Application Note SNVA243. In this topology, the OUTPUT pin becomes the negative output node, and the circuit delivers regulated -5 V with similar efficiency and protection features-but requires repositioning of the inductor and diode.
LM2574N-005G 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-005G FAQ
1.How can I place an order for LM2574N-005G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574N-005G 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-005G reliable?
The price and inventory of LM2574N-005G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574N-005G is usually 5 days.
3.What payment methods are accepted for LM2574N-005G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574N-005G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574N-005G?
LM2574N-005G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574N-005G 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-005G?
For technical support, including LM2574N-005G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574N-005G requirements.
6.How does Aetrix verify that LM2574N-005G is sourced from the original manufacturer or authorized distributors?
All LM2574N-005G 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-005G meets industry standards.
7.What is the process for return or replacement of LM2574N-005G?
All LM2574N-005G units undergo pre-shipment inspection (PSI). If there is an issue with LM2574N-005G, 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-005G part is unused and in its original packaging.
Return procedure for LM2574N-005G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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