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onsemi LM2574N-ADJG
- Part No.:
- LM2574N-ADJG
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574N-ADJG.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:261
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Product details
Overview
LM2574N-ADJG from Texas Instruments is a monolithic non-synchronous step-down (buck) DC-DC switching regulator IC delivering up to 0.5 A output current, with adjustable output voltage range of 1.23 V to 37 V (±4% tolerance), fixed 52-kHz internal oscillator frequency, and wide 40-V input voltage capability. It serves as an efficient replacement for linear regulators in industrial power supplies, embedded controllers, and on-card DC-DC conversion.
For engineers reviewing the LM2574N-ADJG datasheet, pinout, applications, or equivalent options, key selection considerations include feedback reference accuracy (1.23 V ±1.3%), ON/OFF shutdown control (50 μA standby), thermal shutdown protection, cycle-by-cycle current limiting (1.0 A typical peak), and PDIP-8 package compatibility with standard through-hole PCB assembly.
Technical Context
The LM2574N-ADJG implements a fixed-frequency, pulse-width modulation (PWM) buck topology with internal 52-kHz oscillator and integrated 0.5-A NPN power switch. Its error amplifier compares the resistive divider voltage at FB against a precision 1.23-V bandgap reference to regulate output voltage.
Operation includes TTL-compatible ON/OFF control (logic-low enables, logic-high disables), cycle-by-cycle current limiting (1.0 A typical), thermal shutdown (150°C junction limit), and internal frequency compensation - requiring only four external components (inductor, diode, input/output capacitors) for full functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.5 A DC maximum - supports mid-power loads without external pass devices |
| Input Voltage Range | 40 V max (LM2574 series) - suitable for 24-V/36-V industrial bus inputs |
| Output Voltage Range | 1.23 V to 37 V adjustable - set via external resistor divider on FB pin |
| Feedback Reference | 1.23 V ±4% over line/load/temp - determines output accuracy and stability margin |
| Oscillator Frequency | 52 kHz ±10% - fixed frequency enables predictable EMI filtering and inductor sizing |
| Standby Current | 50 μA typical - enables low-power shutdown mode for battery-backed systems |
| Current Limit | 1.0 A typical peak - protects switch during overload or short-circuit conditions |
| Thermal Shutdown | 150°C junction - prevents permanent damage under sustained overtemperature |
Pinout & Package
LM2574N-ADJG is housed in an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Thermal performance is optimized via PWR_GND and SIG_GND pins, with NC pins used for mechanical stability and heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback sense input | Connects to midpoint of R1–R2 divider; sets output voltage as VOUT = 1.23 × (1 + R2/R1) |
| 2 SIG_GND | Signal ground reference | Ground return for internal bandgap, error amp, and logic - must be tied to system ground |
| 3 ON/OFF | Enable/disable control | Logic-low (≤1.2 V) enables regulation; logic-high (≥2.2 V) forces 50-μA standby mode |
| 4 PWR_GND | Power ground | High-current return path for switch emitter and input/output capacitors - minimize trace inductance |
| 5 VIN | Input supply | DC input (up to 40 V); connect to ≥22-μF low-ESR capacitor with short, wide traces |
| 6–8 NC | No internal connection | Internally unconnected but soldered to PCB for mechanical integrity and thermal conduction |
| 7 OUTPUT | Switch emitter node | Drives external diode cathode and inductor - high dv/dt node requiring careful layout |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 52-kHz oscillator | Enables consistent EMI profile and simplifies filter design without external timing components |
| TTL-compatible ON/OFF | Allows microcontroller or logic-level sequencing with <10 μA input leakage and 50 μA standby draw |
| Internal current limiting | 1.0 A peak switch current protection eliminates need for external current-sense circuitry |
| Thermal shutdown | Automatically disables regulator at 150°C junction temperature to prevent irreversible failure |
| Requires only 4 external parts | Reduces BOM count and layout complexity: inductor, Schottky diode, CIN, COUT |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Generating 5 V/0.5 A from a 24-V rail for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable, efficient DC power with minimal heatsinking. Use Value: Replaces linear regulators to reduce board temperature rise by >60% at full load while maintaining ±4% output accuracy. | Use Scenario: On-board 3.3-V supply for MCU, FPGA, and communication peripherals in ruggedized edge devices. IC Role / Device Role / Timing Role: Compact, through-hole buck converter enabling single-rail input with programmable output voltage. Use Value: Adjustable output allows reuse across multiple board variants; PDIP-8 simplifies manual rework and prototyping. |
| Positive-to-Negative Converter | Preregulator for Linear Regulators |
Use Scenario: Generating –5 V from +12 V for op-amp biasing or analog signal conditioning circuits. IC Role / Device Role / Timing Role: Configured in buck-boost topology to invert polarity while regulating magnitude. Use Value: Leverages same IC and layout footprint as buck mode - only diode and capacitor orientation change required. | Use Scenario: Reducing 24-V input to 7-V intermediate rail before LDO for noise-sensitive analog subsystems. IC Role / Device Role / Timing Role: High-efficiency preregulator minimizing power dissipation upstream of low-noise linear regulators. Use Value: Achieves >77% efficiency at 0.5 A, cutting heat generation versus direct 24-V-to-3.3-V linear conversion. |
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-ADJ | Higher 1-A output current, 52-kHz frequency, wider 40-V input, but larger SOIC-16 or TO-220 packages | Supports higher load currents and improved thermal performance in space-constrained designs | Choose when >0.5 A output or better thermal derating is required; not pin-compatible with LM2574N-ADJG |
| MC33063AP | 3-A switch current, 100-kHz oscillator, requires external transistor; ±2% reference; no integrated switch | Suitable for higher-power or cost-sensitive designs where external switch selection is acceptable | Choose for scalability beyond 0.5 A or when custom switch optimization is needed; different pinout and external component count |
Compared with LM2575N-ADJ and MC33063AP, the LM2574N-ADJG offers the smallest BOM count (only 4 external parts), lowest layout complexity, and proven reliability in legacy industrial systems - making it optimal for cost-sensitive, medium-current, through-hole power designs where 0.5 A suffices.
Availability
LM2574N-ADJG is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, positive-to-negative converters, and preregulator applications requiring stable component supply, long-lifecycle support, and through-hole manufacturability.
Supply support for LM2574N-ADJG 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 ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.
The LM2574x SIMPLE SWITCHER® product line delivers easy-to-use, high-reliability DC-DC buck regulators targeting cost-sensitive, medium-power applications where minimal external components and robust thermal protection are essential.
FAQ
What is the maximum input voltage rating for LM2574N-ADJG?
The LM2574N-ADJG has an absolute maximum input voltage rating of 45 V, with recommended operating input voltage up to 40 V. Exceeding 40 V may reduce reliability or trigger internal protection circuits. This rating applies specifically to the standard LM2574 (non-HV) variant; the LM2574HV version supports up to 60 V. Always observe derating guidelines per the official TI SNVS104E datasheet for LM2574N-ADJG.
How is output voltage set on LM2574N-ADJG?
The LM2574N-ADJG uses its FB pin to sense a resistive voltage divider between VOUT and GND. Output voltage is calculated as VOUT = 1.23 V × (1 + R2/R1), where R1 connects FB to GND and R2 connects VOUT to FB. The 1.23-V internal reference has ±4% tolerance over temperature and load, directly determining output accuracy. This configuration is documented in Section 6.10 and Figure 22 of the LM2574N-ADJG datasheet.
Does LM2574N-ADJG include thermal protection?
Yes, LM2574N-ADJG incorporates thermal shutdown that disables the internal switch when junction temperature reaches approximately 150°C. Recovery occurs automatically once temperature falls below the hysteresis threshold (~135°C). This protection is fully integrated and requires no external components. Thermal metrics including RθJA = 60.4°C/W (PDIP-8) are specified in Section 6.4 of the LM2574N-ADJG datasheet.
What is the typical standby current of LM2574N-ADJG in shutdown mode?
The LM2574N-ADJG draws 50 μA typical standby current when the ON/OFF pin is held high (≥2.2 V), placing the device in low-power shutdown mode. Maximum specified value is 200 μA over temperature. This feature enables energy-efficient operation in battery-powered or always-on systems. Standby current is measured per Section 6.5 (ISTBY) of the LM2574N-ADJG datasheet under VIN = 12 V, TJ = 25°C.
Can LM2574N-ADJG be used in buck-boost topology?
Yes, LM2574N-ADJG can be configured as a positive-to-negative buck-boost converter, as shown in Figure 16 of the official datasheet. In this mode, the OUTPUT pin drives the inductor, the diode anode connects to ground, and the negative output is taken from the inductor–diode junction. Output magnitude remains regulated, but polarity is inverted. This application is explicitly supported and validated for LM2574N-ADJG in TI's SNVS104E documentation.
LM2574N-ADJG 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- 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-ADJG FAQ
1.How can I place an order for LM2574N-ADJG through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574N-ADJG 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-ADJG reliable?
The price and inventory of LM2574N-ADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574N-ADJG is usually 5 days.
3.What payment methods are accepted for LM2574N-ADJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574N-ADJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574N-ADJG?
LM2574N-ADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574N-ADJG 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-ADJG?
For technical support, including LM2574N-ADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574N-ADJG requirements.
6.How does Aetrix verify that LM2574N-ADJG is sourced from the original manufacturer or authorized distributors?
All LM2574N-ADJG 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-ADJG meets industry standards.
7.What is the process for return or replacement of LM2574N-ADJG?
All LM2574N-ADJG units undergo pre-shipment inspection (PSI). If there is an issue with LM2574N-ADJG, 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-ADJG part is unused and in its original packaging.
Return procedure for LM2574N-ADJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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