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onsemi LM2574DW-ADJR2G
- Part No.:
- LM2574DW-ADJR2G
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574DW-ADJR2G.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,206
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Product details
Overview
LM2574DW-ADJR2G 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 ±4% output voltage accuracy, 52 kHz fixed-frequency operation, and adjustable output voltage range of 1.23 V to 37 V. It serves as a high-efficiency replacement for linear regulators in industrial power supplies, embedded controllers, and distributed power architectures.
For engineers reviewing the LM2574DW-ADJR2G 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, feedback reference voltage (1.23 V), and SOIC-14 package compatibility with standard PCB layout practices.
Technical Context
The LM2574DW-ADJR2G implements a fixed-frequency PWM controller with internal oscillator (47–58 kHz), cycle-by-cycle current limiting, and thermal shutdown. Its error amplifier compares the FB pin voltage against a 1.23 V internal bandgap reference to regulate output via external resistor divider.
It operates in discontinuous or continuous conduction mode depending on load and inductor selection, supports delayed start-up via RC network on ON/OFF pin, and features separate signal ground (SIG_GND) and power ground (PWR_GND) pins to minimize noise coupling into the feedback path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.5 A maximum DC load - sufficient for powering microcontrollers, sensors, and interface ICs without external pass devices. |
| Input Voltage Range | 4.75 V to 40 V - enables direct regulation from 12 V, 24 V, or 36 V industrial rails without pre-regulation. |
| Feedback Reference | 1.23 V ±1.3% - sets precise output voltage using two external resistors; tolerance directly impacts output accuracy. |
| Oscillator Frequency | 52 kHz nominal (42–63 kHz over temperature) - determines inductor size and EMI profile; fixed frequency simplifies filter design. |
| Standby Current | 50 μA typical at ON/OFF = 5 V - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal Protection | Junction temperature limit 150°C with automatic shutdown - prevents damage during overload or poor heatsinking; resumes operation after cooldown. |
| Output Saturation Voltage | 1.2 V max at 0.5 A - defines minimum dropout and impacts efficiency at low output voltages. |
Pinout & Package
LM2574DW-ADJR2G is housed in a 14-pin SOIC (NPA) package measuring 8.992 mm × 7.498 mm, with exposed pad not electrically connected. Thermal resistance RθJA is 77.1°C/W on JEDEC 4-layer board, requiring minimal copper area for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback input | Senses output voltage via resistor divider; open-loop connection disables regulation; 100 nA bias current minimizes divider error. |
| OUTPUT (Pin 12) | Switch emitter node | Drives external inductor and diode; high dv/dt node requiring short trace routing and local decoupling. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible: <1.2 V = active, >1.4 V = shutdown; 12 μA max input current allows simple logic-level drive. |
| SIG_GND (Pin 4) | Signal reference ground | Return for internal reference and error amplifier; must be tied to system ground but kept separate from noisy PWR_GND paths. |
| PWR_GND (Pin 6) | Power return path | High-current return for switch and input/output capacitors; requires low-inductance connection to minimize voltage spikes. |
| VIN (Pin 10) | Main supply input | Connects to input capacitor (≥22 μF); high dv/dt node demanding short, wide traces to CIN and PWR_GND. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 52-kHz oscillator | Enables predictable EMI spectrum and consistent inductor sizing across designs without external timing components. |
| Internal current limit | 1.0 A peak switch current limit protects against short-circuit faults while allowing transient load surges up to 0.5 A DC. |
| Separate SIG_GND / PWR_GND | Reduces noise coupling into feedback loop, improving output voltage stability under dynamic load conditions. |
| TTL shutdown capability | Supports system-level power sequencing and low-quiescent standby states without external level-shifting circuitry. |
| Thermal shutdown | Automatically disables switching when junction exceeds 150°C, preventing irreversible damage during sustained overload or ambient rise. |
Applications
| Industrial PLC Power Supply | Embedded Microcontroller Core Rail |
|---|---|
Use Scenario: Provides stable 3.3 V or 5 V rail from 24 V DC field bus in programmable logic controller backplane. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24 V to clean microcontroller core voltage with line/load regulation ≤±4%. Use Value: Eliminates need for heat sinks due to 77%+ efficiency at 0.5 A, reducing board space and enabling conformal coating in harsh environments. | Use Scenario: Powers ARM Cortex-M or RISC-V SoC in edge sensor node with battery backup and wake-on-event capability. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 1.8 V or 3.3 V; enabled/disabled via MCU GPIO on ON/OFF pin. Use Value: 50 μA standby current extends battery life; fixed frequency allows predictable sleep/wake timing and EMI filtering. |
| Positive-to-Negative Converter | Preregulator for Linear Regulator |
Use Scenario: Generates –5 V rail from +12 V input in analog front-end for op-amp biasing and ADC reference. IC Role / Device Role / Timing Role: Buck-boost topology using LM2574DW-ADJR2G with inverted inductor/diode configuration per Figure 20. Use Value: Leverages same IC footprint and control logic as buck design, minimizing BOM count and qualification effort. | Use Scenario: Steps down 24 V industrial supply to 7 V before LDO for noise-sensitive RF transceiver module. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing LDO power dissipation by >60% versus direct 24 V → 3.3 V conversion. Use Value: Enables use of smaller, lower-cost LDOs and eliminates thermal derating concerns in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575T-ADJ | TO-220-5 package; 1-A output; 52 kHz oscillator; higher quiescent current (11 mA vs 5 mA active). | Requires heatsink above ~0.3 A; better suited for higher-current, lower-density layouts where thermal mass is available. | Select when >0.5 A output or through-hole assembly is required; not pin-compatible with SOIC-14 footprint. |
| MP1584EN-LF-Z | 3-A output; 1.5 MHz switching; synchronous rectification; 8-pin SOIC; no separate SIG_GND/PWR_GND. | Higher efficiency at light loads; smaller magnetics; unsuitable for noise-sensitive analog circuits due to lack of ground separation. | Choose for compact, high-efficiency designs where EMI filtering and analog integrity are secondary to size/cost. |
Compared with LM2575T-ADJ, LM2574DW-ADJR2G offers surface-mount integration and lower thermal overhead at 0.5 A; versus MP1584EN-LF-Z, it provides superior analog noise immunity via dedicated ground pins and proven industrial reliability, albeit at lower frequency and current rating.
Availability
LM2574DW-ADJR2G is available at Aetrix Electronics and suitable for industrial automation, embedded control, and distributed power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2574DW-ADJR2G 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 industrial-grade power solutions.
The LM2574x SIMPLE SWITCHER® series was designed specifically for cost-sensitive, high-reliability DC-DC conversion in industrial, automotive, and telecom infrastructure-emphasizing ease of use, minimal external components, and robust fault protection.
FAQ
What is the maximum input voltage rating for LM2574DW-ADJR2G?
The absolute maximum supply voltage for LM2574DW-ADJR2G is 45 V, with recommended operating range up to 40 V. Exceeding 45 V risks permanent damage. The HV variant (LM2574HV) supports up to 63 V absolute maximum, but LM2574DW-ADJR2G is the standard-voltage version and must not be operated beyond its 40 V recommended limit for reliable long-term performance.
How does the FB pin function in LM2574DW-ADJR2G?
The FB pin on LM2574DW-ADJR2G senses the output voltage via an external resistor divider and compares it to an internal 1.23 V reference. When the FB voltage drops below 1.23 V, the regulator increases duty cycle; when it rises above, duty cycle decreases. For the adjustable version, this pin must be connected to the midpoint of R1–R2; bias current is only 100 nA typical, minimizing divider error in LM2574DW-ADJR2G designs.
Can LM2574DW-ADJR2G be used in buck-boost configuration?
Yes, LM2574DW-ADJR2G supports positive-to-negative (buck-boost) conversion per TI's Figure 20 in the datasheet. In this configuration, the OUTPUT pin drives the inductor, the diode is reversed, and the output is taken from the junction of inductor and diode cathode referenced to VIN. Output polarity is inverted, and regulation accuracy remains within ±4%, making LM2574DW-ADJR2G suitable for generating dual-rail supplies from single inputs.
What is the purpose of having separate SIG_GND and PWR_GND pins on LM2574DW-ADJR2G?
SIG_GND and PWR_GND on LM2574DW-ADJR2G isolate low-noise analog reference paths from high-current switching return currents. SIG_GND serves the internal bandgap, error amplifier, and feedback comparator; PWR_GND carries switch and capacitor ripple currents. Connecting them together only at a single point near the input capacitor prevents ground bounce from modulating the feedback signal - a critical design requirement for maintaining LM2574DW-ADJR2G output stability under dynamic loads.
Does LM2574DW-ADJR2G require an external diode, and what type is recommended?
Yes, LM2574DW-ADJR2G requires an external fast-recovery or Schottky diode connected between OUTPUT and VOUT. TI recommends a 1-A, 60-V Schottky diode such as MBR0520L or SB120 for optimal efficiency and reverse recovery performance. The diode must handle peak currents up to 1.6 A and withstand reverse voltage equal to VIN; using a slow diode causes excessive power loss and potential thermal failure in LM2574DW-ADJR2G applications.
LM2574DW-ADJR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
LM2574DW-ADJR2G FAQ
1.How can I place an order for LM2574DW-ADJR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574DW-ADJR2G 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-ADJR2G reliable?
The price and inventory of LM2574DW-ADJR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574DW-ADJR2G is usually 5 days.
3.What payment methods are accepted for LM2574DW-ADJR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574DW-ADJR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574DW-ADJR2G?
LM2574DW-ADJR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574DW-ADJR2G 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-ADJR2G?
For technical support, including LM2574DW-ADJR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574DW-ADJR2G requirements.
6.How does Aetrix verify that LM2574DW-ADJR2G is sourced from the original manufacturer or authorized distributors?
All LM2574DW-ADJR2G 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-ADJR2G meets industry standards.
7.What is the process for return or replacement of LM2574DW-ADJR2G?
All LM2574DW-ADJR2G units undergo pre-shipment inspection (PSI). If there is an issue with LM2574DW-ADJR2G, 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-ADJR2G part is unused and in its original packaging.
Return procedure for LM2574DW-ADJR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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