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onsemi LM2574DW-ADJ
- Part No.:
- LM2574DW-ADJ
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574DW-ADJ.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,685
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Product details
Overview
LM2574DW-ADJ from Texas Instruments is a monolithic non-synchronous step-down (buck) DC-DC switching regulator delivering up to 0.5 A output current with ±4% output voltage accuracy, 52-kHz fixed-frequency operation, and adjustable output range from 1.23 V to 37 V. It serves as an efficient replacement for linear regulators in industrial power supplies, embedded controllers, and on-card voltage conversion.
For engineers reviewing the LM2574DW-ADJ datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (up to 40 V), feedback reference voltage (1.23 V), thermal shutdown protection, ON/OFF control interface, and SOIC-14 package compatibility with standard PCB layout practices.
Technical Context
The LM2574DW-ADJ integrates a 0.5-A NPN power switch, fixed 52-kHz oscillator, internal frequency compensation, and error amplifier with 1.23-V precision bandgap reference. Its feedback loop uses external resistor dividers to set output voltage, enabling flexible regulation across 1.23–37 V while maintaining ±4% tolerance over line and load conditions.
It operates in discontinuous or continuous conduction mode depending on load and inductor selection, supports TTL-compatible ON/OFF control with 50-μA standby current, and includes cycle-by-cycle current limiting plus thermal shutdown for fault protection - all without requiring external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.5 A maximum DC load current - sufficient for powering microcontrollers, sensors, and analog circuitry without external current boosting. |
| Input Voltage Range | 4 V to 40 V - supports wide-input industrial and automotive-derived supplies, including unregulated 24-V rails. |
| Output Voltage Range | 1.23 V to 37 V (adjustable) - set via external resistive divider; enables single-part reuse across multiple system voltage domains. |
| Feedback Reference | 1.23 V ±1.3% - high-precision bandgap reference enabling accurate output regulation independent of temperature and supply variation. |
| Switching Frequency | 52 kHz ±10% - fixed internal oscillator simplifies EMI filtering and allows use of low-cost, high-saturation-current inductors. |
| Efficiency | Up to 77% at 5 V/0.5 A - significantly reduces heat generation versus linear regulators, eliminating need for heatsinks in most applications. |
| Standby Current | 50 μA typical - enables low-power shutdown mode via ON/OFF pin, critical for battery-backed or energy-conscious systems. |
Pinout & Package
LM2574DW-ADJ is housed in a 14-pin SOIC (NPA) package measuring 8.992 mm × 7.498 mm, optimized for thermal performance and manufacturability on standard PCBs. The package features exposed pad-compatible layout and requires no external compensation network.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback sense input | Connects to midpoint of R1/R2 divider; sets output voltage via VOUT = 1.23 × (1 + R2/R1); high-impedance (≤100 nA bias) minimizes divider current loss. |
| SIG_GND (Pin 4) | Signal ground reference | Ground return for internal bandgap, error amp, and logic; must be routed separately from power ground to avoid noise coupling into regulation loop. |
| ON/OFF (Pin 5) | Enable/disable control | TTL-compatible input: <1.2 V = active, >1.4 V = shutdown; 50-μA standby current enables simple microcontroller GPIO control. |
| OUTPUT (Pin 12) | Power switch emitter | Switching node connected to inductor and diode cathode; carries pulsed 0.5-A current; requires short, low-inductance PCB trace. |
| PWR_GND (Pin 6) | Power ground | High-current return path for input capacitor, output capacitor, and diode; must be tied to SIG_GND at single point near IC for stability. |
| VIN (Pin 10) | Input supply | Collector connection of internal NPN switch; accepts 4–40 V; requires local 22-μF electrolytic + ceramic bypass capacitor within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5-A NPN switch | Eliminates need for external MOSFET and driver; saturation voltage ≤1.2 V at 0.5 A reduces conduction loss and thermal stress. |
| Fixed 52-kHz oscillator | Enables predictable EMI profile and simplifies filter design; no external timing components required. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating; cycle-by-cycle current limiting (0.7–1.6 A peak) prevents switch destruction during short-circuit events. |
| Internal frequency compensation | Allows stable operation with only four external components (inductor, diode, input/output caps, feedback resistors), reducing BOM count and layout complexity. |
| Adjustable output via resistor divider | Supports custom output voltages without redesign; feedback pin draws only 100 nA, enabling high-resistance dividers to minimize quiescent current. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Converting 24-V factory bus to 3.3-V or 5-V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC rail with high efficiency and minimal thermal rise on dense PCBs. Use Value: Replaces linear regulators to cut power dissipation by >70%, enabling fanless enclosure designs and extending component lifetime. | Use Scenario: Generating clean 5-V and 3.3-V supplies for ARM Cortex-M microcontrollers and peripheral ICs on compact evaluation boards. IC Role / Device Role / Timing Role: On-board switching regulator delivering stable, low-noise supply with programmable enable control for sleep/wake sequencing. Use Value: Enables precise power sequencing via ON/OFF pin and eliminates need for external compensation, accelerating board bring-up. |
| Automotive Subsystem | Test & Measurement Equipment |
Use Scenario: Regulating 12-V vehicle battery (with transient spikes up to 40 V) to 5-V for infotainment display logic and CAN transceivers. IC Role / Device Role / Timing Role: Input-tolerant buck converter with built-in overvoltage and thermal protection for harsh environments. Use Value: Withstands load-dump transients up to 40 V and maintains regulation across –40°C to +125°C junction temperature range. | Use Scenario: Providing variable 1.23–15-V output for benchtop power sources and calibration fixtures requiring user-adjustable voltage rails. IC Role / Device Role / Timing Role: Adjustable-output DC-DC stage enabling precise, ripple-controlled voltage generation without potentiometer-based linear solutions. Use Value: Achieves <1% output error over temperature and load using only two external resistors, improving test repeatability and reducing calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575-ADJ | Higher output current (1 A), same 52-kHz frequency, but larger SOIC-16 package and higher quiescent current (10 mA vs 5 mA active). | Better suited for higher-load applications where 0.5-A limit of LM2574DW-ADJ is insufficient; requires PCB footprint change. | Select when >0.5-A output or improved thermal margin is required; verify layout compatibility with SOIC-16. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller solution size, but requires external compensation and lacks integrated thermal shutdown flag. | Ideal for space-constrained designs needing compact inductors; less robust for unattended industrial use due to missing fault reporting. | Choose for portable or consumer-grade products where size outweighs safety-critical protection requirements. |
Compared with LM2575-ADJ and MP1584EN-LF-Z, the LM2574DW-ADJ offers the best balance of simplicity (no compensation needed), proven ruggedness (thermal + current protection), and SOIC-14 footprint compatibility - making it optimal for cost-sensitive, reliability-focused industrial and embedded power designs.
Availability
LM2574DW-ADJ is available at Aetrix Electronics and suitable for industrial automation, embedded controller power, and test equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2574DW-ADJ 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 experience in high-reliability power conversion ICs.
The LM2574x SIMPLE SWITCHER® product line was designed specifically for engineers seeking easy-to-use, robust, and cost-effective DC-DC buck regulators that replace linear solutions without complex design overhead.
FAQ
What is the maximum input voltage rating for the LM2574DW-ADJ?
The LM2574DW-ADJ has an absolute maximum input voltage rating of 45 V, with recommended operating range up to 40 V. This allows safe operation from nominal 24-V or 36-V industrial supplies, including transient spikes common in automotive and factory environments. Exceeding 45 V risks permanent damage per the Absolute Maximum Ratings table in the TI datasheet SNVS104E.
How do I calculate the output voltage for the LM2574DW-ADJ?
The output voltage of the LM2574DW-ADJ is set by a resistive divider between VOUT and GND, connected to the FB pin. Use the formula VOUT = 1.23 V × (1 + R2/R1), where R1 connects FB to GND and R2 connects VOUT to FB. For example, R1 = 1.0 kΩ and R2 = 3.1 kΩ yields 5.0 V. The FB pin draws only ≤100 nA, so high-value resistors minimize idle current without affecting accuracy.
Does the LM2574DW-ADJ require external compensation components?
No, the LM2574DW-ADJ does not require external compensation components. It integrates internal frequency compensation optimized for stability with standard external components: one inductor, one Schottky diode, one input capacitor (≥22 μF), and one output capacitor (≥100 μF). This simplifies design, reduces BOM count, and eliminates tuning effort - a core advantage of the SIMPLE SWITCHER® architecture.
What protection features are built into the LM2574DW-ADJ?
The LM2574DW-ADJ includes cycle-by-cycle current limiting (peak switch current 0.7–1.6 A), thermal shutdown (activates above 150°C junction temperature), and undervoltage lockout (prevents startup below ~4 V). These features protect the IC and external components during overload, short-circuit, or overheating events - ensuring reliable operation without additional discrete protection circuitry.
Can the LM2574DW-ADJ be used in a buck-boost configuration?
Yes, the LM2574DW-ADJ can be configured as a positive-to-negative buck-boost converter, as documented in TI's LM2574 datasheet Section 2 (Applications) and Figure 18. In this topology, the OUTPUT pin drives the inductor, and the feedback network references the negative output rail. Output voltage magnitude remains adjustable from 1.23 V to 37 V, but polarity is inverted; careful attention to grounding and diode orientation is required for stable operation.
LM2574DW-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
LM2574DW-ADJ FAQ
1.How can I place an order for LM2574DW-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574DW-ADJ 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 LM2574DW-ADJ reliable?
The price and inventory of LM2574DW-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574DW-ADJ is usually 5 days.
3.What payment methods are accepted for LM2574DW-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574DW-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574DW-ADJ?
LM2574DW-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574DW-ADJ 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 LM2574DW-ADJ?
For technical support, including LM2574DW-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574DW-ADJ requirements.
6.How does Aetrix verify that LM2574DW-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2574DW-ADJ 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 LM2574DW-ADJ meets industry standards.
7.What is the process for return or replacement of LM2574DW-ADJ?
All LM2574DW-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2574DW-ADJ, 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 LM2574DW-ADJ part is unused and in its original packaging.
Return procedure for LM2574DW-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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