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onsemi LM2574N-12G
- Part No.:
- LM2574N-12G
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574N-12G.pdf
- Description:
- IC REG BUCK BST 12V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:419
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Product details
Overview
LM2574N-12G from Texas Instruments is a monolithic 0.5-A non-synchronous step-down (buck) DC-DC switching regulator with fixed 12-V output, 40-V maximum input voltage, 52-kHz fixed-frequency oscillator, and ±4% output voltage tolerance over line and load. It delivers stable power in on-card switching supplies and serves as an efficient preregulator for linear regulators.
For engineers reviewing the LM2574N-12G datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (up to 40 V), thermal shutdown protection, TTL-compatible ON/OFF control, and compatibility with standard off-the-shelf inductors for rapid buck converter design.
Technical Context
The LM2574N-12G integrates a PWM controller, power transistor, oscillator, error amplifier, and current-limit circuit in a single PDIP-8 package. Its fixed 12-V output is internally trimmed and requires no external feedback resistors-FB pin is connected directly to the output capacitor. The device operates in continuous or discontinuous conduction mode depending on load and inductor selection.
It features cycle-by-cycle current limiting (typical peak limit 1.0 A), thermal shutdown at ~150°C junction temperature, and a low-power standby mode with 50-μA typical quiescent current when the ON/OFF pin is pulled high. Oscillator frequency remains stable at 52 kHz ±10% across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail without feedback resistor network. |
| Max Input Voltage | 40 V - supports wide industrial input ranges including 24-V and 36-V systems with margin. |
| Output Current | 0.5 A DC - sufficient for powering microcontrollers, sensors, and analog circuitry in embedded systems. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI compared to MHz-range converters. |
| Efficiency | 88% at VIN = 15 V, IOUT = 0.5 A - minimizes heat generation; PCB copper traces suffice as primary heatsink. |
| Standby Current | 50 μA typical - enables low-power shutdown in battery-backed or energy-conscious applications. |
| Thermal Resistance | RθJA = 60.4°C/W (PDIP-8) - allows operation up to +125°C ambient with appropriate board layout. |
Pinout & Package
LM2574N-12G is housed in an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width. Thermal performance relies on short PWR_GND and VIN trace paths to minimize switching loop inductance and improve stability.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback sense input | Internally connected to output for fixed 12-V version; must be tied directly to output capacitor - no external divider required. |
| 2 SIG_GND | Signal ground reference | Ground for internal bandgap reference and error amplifier; separate from power ground to reduce noise coupling. |
| 3 ON/OFF | Enable control input | TTL-compatible: <1.2 V = active, >1.4 V = shutdown; 50-μA standby current enables simple microcontroller or logic-level control. |
| 4 PWR_GND | Power ground return | High-current return path for switch emitter and input/output capacitors; must be low-inductance connection to system ground. |
| 5 VIN | Main supply input | Accepts 4.75–40 V DC; requires ≥22-μF low-ESR electrolytic capacitor placed adjacent to pin with short leads. |
| 6–8 NC | No internal connection | Not bonded; 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 layout to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-output architecture | Eliminates external feedback resistors - simplifies BOM, improves long-term output accuracy, and reduces layout sensitivity. |
| Integrated thermal shutdown | Automatically disables switching above ~150°C junction temperature - protects IC and system during overload or poor heatsinking. |
| Current-limit protection | Peak-switch current limited to 0.7–1.6 A - prevents damage during short-circuit or startup into heavy capacitive loads. |
| Low-component-count design | Requires only four external components (inductor, diode, input cap, output cap) - accelerates prototyping and reduces bill-of-materials cost. |
| 52-kHz fixed-frequency operation | Enables predictable EMI filtering and compatibility with low-cost, high-current toroidal or drum-core inductors. |
Applications
| Industrial Power Supply | Embedded Controller Rail |
|---|---|
Use Scenario: Generating a clean 12-V rail from a 24-V industrial bus to power PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator delivering regulated 12-V DC with high efficiency and thermal robustness. Use Value: 88% efficiency at 0.5-A load reduces thermal stress on PCB; 40-V input rating accommodates 24-V bus transients per IEC 61000-4-5. | Use Scenario: Providing stable 12-V supply to an ARM-based MCU development board with mixed analog/digital peripherals. IC Role / Device Role / Timing Role: On-board switching regulator replacing linear regulators to avoid excessive power dissipation at higher input voltages. Use Value: Fixed 12-V output eliminates trimming; 52-kHz switching enables compact LC filter design while maintaining low EMI in mixed-signal environments. |
| Preregulator for Linear Regulators | Positive-to-Negative Converter |
Use Scenario: Pre-stepping down 36-V input to 15-V before feeding a low-noise LDO to generate 3.3-V for ADC reference circuits. IC Role / Device Role / Timing Role: High-efficiency buck stage reducing dropout voltage and heat generation upstream of precision linear regulation. Use Value: 0.5-A output supports multiple downstream LDOs; ±4% output tolerance ensures consistent headroom for following regulators. | Use Scenario: Configured in buck-boost topology to generate –12-V from a +12-V source for op-amp dual-rail applications. IC Role / Device Role / Timing Role: Switching controller repurposed as inverting regulator via modified external component connections. Use Value: Same 52-kHz oscillator and current-limit circuit enable reliable negative rail generation without additional ICs - validated in TI Application Note SLVA053. |
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-12 | Higher 1-A output current; 52-kHz oscillator; same PDIP-8 package and pinout. | Supports heavier loads without redesign; requires larger inductor and diode due to higher peak currents. | Select when >0.5-A output current is needed and board space allows upgraded magnetics. |
| LM2596T-12 | 1.5-A output; 150-kHz switching frequency; TO-220-5 package with exposed tab for better thermal performance. | Better suited for high-ambient-temperature or high-reliability industrial applications requiring lower junction rise. | Choose when thermal management is critical and through-hole mounting with heatsink attachment is acceptable. |
Compared with LM2574N-12G, LM2575N-12 offers higher current capacity in identical footprint, while LM2596T-12 trades lower frequency for greater output capability and superior thermal handling - both require validation of inductor saturation current and PCB thermal relief.
Availability
LM2574N-12G is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller rails, and preregulator designs requiring stable component supply, long-lifecycle support, and proven reliability in harsh environments.
Supply support for LM2574N-12G 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, specializing in analog, embedded processing, and power management technologies.
The LM2574x SIMPLE SWITCHER® series was designed to replace linear regulators in medium-power DC-DC conversion applications, emphasizing ease of use, minimal external components, and robust protection features for industrial and automotive subsystems.
FAQ
What is the maximum input voltage rating for the LM2574N-12G?
The LM2574N-12G has a maximum input voltage rating of 40 V, as specified in its Absolute Maximum Ratings table. This allows safe operation from common industrial 24-V and 36-V rails with transient margin. Exceeding 40 V risks permanent damage, and the HV variant (LM2574HV-12) is required for inputs up to 60 V. Always verify input transient profiles against this limit in the final design.
Does the LM2574N-12G require external feedback resistors to set its output voltage?
No, the LM2574N-12G does not require external feedback resistors. As a fixed-output variant, its 12-V regulation is achieved by internal trimming - the FB pin is connected directly to the output capacitor. This eliminates resistor tolerance errors and layout sensitivity, improving long-term output accuracy and simplifying design versus adjustable versions like the LM2574ADJ.
How does the ON/OFF pin function on the LM2574N-12G?
The ON/OFF pin on the LM2574N-12G provides TTL-compatible enable control: pulling it below 1.2 V activates regulation, while pulling it above 1.4 V places the device in low-power shutdown mode with 50-μA typical standby current. It must never be left floating. This feature enables precise power sequencing in multi-rail systems and battery-saving modes in portable equipment using the LM2574N-12G.
What thermal considerations apply to the LM2574N-12G in PDIP-8 package?
The LM2574N-12G in PDIP-8 has a junction-to-ambient thermal resistance (RθJA) of 60.4°C/W. To maintain TJ ≤125°C at maximum load, ambient temperature must stay below ~85°C with standard 4-layer PCB layout. Minimizing PWR_GND and VIN trace lengths, using wide copper pours under the package, and avoiding enclosed enclosures are essential. Derating is recommended above 70°C ambient.
Can the LM2574N-12G be used in a buck-boost (inverting) configuration?
Yes, the LM2574N-12G can be configured as a positive-to-negative buck-boost converter, as documented in TI Application Note SLVA053. In this topology, the OUTPUT pin drives an inductor to ground, the diode anodes connect to ground, and the output capacitor forms the negative rail. While the fixed 12-V internal reference no longer applies, the oscillator, switch, and protection circuits remain fully functional - enabling –12-V generation from a +12-V source using the same LM2574N-12G.
LM2574N-12G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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):
- 12V
- 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-12G FAQ
1.How can I place an order for LM2574N-12G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574N-12G 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-12G reliable?
The price and inventory of LM2574N-12G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574N-12G is usually 5 days.
3.What payment methods are accepted for LM2574N-12G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574N-12G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574N-12G?
LM2574N-12G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574N-12G 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-12G?
For technical support, including LM2574N-12G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574N-12G requirements.
6.How does Aetrix verify that LM2574N-12G is sourced from the original manufacturer or authorized distributors?
All LM2574N-12G 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-12G meets industry standards.
7.What is the process for return or replacement of LM2574N-12G?
All LM2574N-12G units undergo pre-shipment inspection (PSI). If there is an issue with LM2574N-12G, 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-12G part is unused and in its original packaging.
Return procedure for LM2574N-12G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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