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onsemi LM2574DW-ADJR2
- Part No.:
- LM2574DW-ADJR2
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2574DW-ADJR2.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,971
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Product details
Overview
LM2574DW-ADJR2 from Texas Instruments is a monolithic non-synchronous step-down (buck) DC-DC switching regulator IC delivering up to 0.5 A output current, featuring adjustable output voltage from 1.23 V to 37 V (±4% tolerance), fixed 52-kHz internal oscillator frequency, and wide 40-V input voltage range. 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-ADJR2 datasheet, pinout, applications, or equivalent options, key selection considerations include feedback voltage accuracy (1.23 V ±1.3%), ON/OFF shutdown control with 50-μA standby current, thermal shutdown protection, and SOIC-14 package compatibility with standard PCB layout practices.
Technical Context
The LM2574DW-ADJR2 implements a fixed-frequency PWM architecture with internal error amplifier, 1.23-V bandgap reference, and cycle-by-cycle current limiting. Its non-synchronous design uses an external diode for freewheeling, and regulation is achieved via feedback voltage comparison at the FB pin against the internal 1.23-V reference.
It operates in continuous conduction mode under typical loads but transitions to discontinuous mode at light loads. Shutdown is TTL-compatible: logic-high (>1.4 V) disables switching and reduces quiescent current to 50 μA typical; logic-low (<1.2 V) enables regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.5 A maximum DC load - supports mid-power embedded systems without external current boosting. |
| Feedback Voltage | 1.23 V ±1.3% - sets output via resistor divider; enables precise 1.23–37 V adjustment with <±4% total output error. |
| Oscillator Frequency | 52 kHz ±10% - fixed internal timing enables predictable EMI profile and simplifies filter design. |
| Input Voltage Range | 40 V max (LM2574 variant) - suitable for 24-V and 36-V industrial rails with margin; not rated for HV (60-V) operation. |
| Standby Current | 50 μA typical - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Saturation Voltage | 1.2 V max at 0.5 A - defines minimum dropout and impacts efficiency at low VOUT/VIN ratios. |
| Thermal Resistance | RθJA = 77.1 °C/W (SOIC-14) - requires minimal copper area for thermal management at full load. |
Pinout & Package
LM2574DW-ADJR2 is housed in a 14-pin SOIC (NPA) package measuring 8.992 mm × 7.498 mm, optimized for thermal performance and board-level reliability in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback sense input | Connects to resistor divider midpoint; regulates output by comparing divided VOUT to 1.23-V internal reference. |
| OUTPUT (Pin 12) | Switch emitter node | Drives external inductor and diode; high-current switching node requiring short, low-inductance PCB routing. |
| ON/OFF (Pin 5) | Enable/disable control | TTL-compatible input: <1.2 V = active regulation; >1.4 V = shutdown with 50-μA quiescent current. |
| VIN (Pin 10) | Main power input | Accepts up to 40 V; must be bypassed with ≥22-μF electrolytic capacitor placed near pin with short PWR_GND return path. |
| PWR_GND (Pin 6) | Power ground | High-current return for switch and input/output capacitors; separate from SIG_GND to minimize noise coupling. |
| SIG_GND (Pin 4) | Signal ground | Reference for internal bandgap, error amp, and logic; connects to system ground but routed separately from PWR_GND. |
| NC (Pins 1, 2, 7, 8, 9, 11, 13, 14) | No internal connection | Internally unconnected; must be soldered to PCB for mechanical stability and thermal conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage range | 1.23 V to 37 V set by external resistor divider - eliminates need for multiple fixed-output SKUs in BOM. |
| Internal frequency compensation | Eliminates external compensation network - reduces component count and design iteration time. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overtemperature without external circuitry. |
| Low-component-count design | Requires only 4 external parts (inductor, diode, input cap, output cap) - accelerates prototyping and lowers BoM cost. |
| High-efficiency buck topology | Up to 88% efficiency (e.g., 12-VIN/12-VOUT @ 0.5 A) - reduces heat generation vs. linear regulators. |
Applications
| Industrial PLC Power Supply | Embedded Controller Core Rail |
|---|---|
Use Scenario: Generating stable 5-V or 3.3-V rail from 24-V field bus in programmable logic controller backplane. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated core voltage for microcontroller and I/O drivers. Use Value: Delivers 0.5-A output with ±4% regulation across line/load/temperature; eliminates need for heatsink due to high efficiency and SOIC thermal design. |
Use Scenario: On-board 3.3-V supply for ARM Cortex-M or RISC-V SoC in edge gateway device. IC Role / Device Role / Timing Role: Non-synchronous buck converter enabling compact, low-cost power architecture with minimal external components. Use Value: Fixed 52-kHz switching frequency allows predictable EMI filtering; 50-μA shutdown current extends battery backup runtime during deep sleep. |
| Test Equipment Auxiliary Supply | Motor Drive Logic Power |
Use Scenario: Deriving clean ±15-V analog rails from single 40-V supply in bench multimeter or signal generator. IC Role / Device Role / Timing Role: Adjustable-output buck stage feeding inverting charge-pump or linear post-regulator for precision analog subsystems. Use Value: 1.23-V feedback reference enables accurate multi-rail generation; ±4% output tolerance meets metrology-grade stability requirements. |
Use Scenario: Providing isolated 12-V gate drive and 5-V logic power from main DC bus in BLDC motor driver module. IC Role / Device Role / Timing Role: Pre-regulator stepping down high-voltage bus to intermediate rail before LDO or isolated DC-DC conversion. Use Value: 40-V input rating accommodates 36-V nominal bus with transient margin; thermal shutdown prevents latch-up during MOSFET short-circuit events. |
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; higher 1-A output current; same 52-kHz frequency and 1.23-V feedback reference. | Better suited for higher-current, thermally unconstrained designs; lacks SOIC footprint compatibility. | Select when >0.5-A load or through-hole assembly is required; not drop-in for LM2574DW-ADJR2 PCBs. |
| TPS54202DR | 2-A synchronous buck; 4.5–28-V input; 500-kHz switching; integrated high-side/low-side FETs; 0.8-V reference. | Enables smaller magnetics and higher efficiency at light loads; requires different compensation and layout. | Choose for space-constrained, high-efficiency designs where synchronous operation and wider input range justify redesign effort. |
Compared with LM2574DW-ADJR2, LM2575T-ADJ offers higher current in a larger package, while TPS54202DR delivers double the current, synchronous operation, and modern integration-but both require layout changes and do not share pinout or thermal behavior.
Availability
LM2574DW-ADJR2 is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded controller core rails, test equipment auxiliary supplies, and motor drive logic power requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM2574DW-ADJR2 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 with broad industrial and automotive reach.
The LM2574x SIMPLE SWITCHER® product line was designed to simplify mid-power DC-DC conversion for industrial, instrumentation, and embedded applications-emphasizing ease of use, minimal external components, and robust protection features.
FAQ
What is the maximum input voltage rating for LM2574DW-ADJR2?
The LM2574DW-ADJR2 is rated for a maximum input voltage of 40 V, consistent with the standard LM2574 (non-HV) family specification. It is not rated for the 60-V maximum of the LM2574HV variants. Exceeding 40 V may cause permanent damage, as confirmed in Section 6.1 Absolute Maximum Ratings of the SNVS104E datasheet.
Does LM2574DW-ADJR2 support synchronous rectification?
No, LM2574DW-ADJR2 is a non-synchronous buck regulator and requires an external Schottky diode for freewheeling. The OUTPUT pin drives only the emitter of an internal NPN transistor; no integrated low-side FET or synchronous control logic is present. This is explicitly stated in the Functional Block Diagram and Description sections of the datasheet.
What is the feedback voltage accuracy of LM2574DW-ADJR2 over temperature?
The LM2574DW-ADJR2 has a feedback voltage (VFB) of 1.23 V with ±1.3% initial tolerance at 25°C, and ±2.5% variation over the full –40°C to +125°C junction temperature range, as specified in Section 6.10 Electrical Characteristics – Adjustable Version of the SNVS104E datasheet.
Can LM2574DW-ADJR2 be used in a buck-boost configuration?
Yes - the LM2574DW-ADJR2 can be configured as a positive-to-negative buck-boost converter, as documented in Section 2 Applications and Figure 16 of the SNVS104E datasheet. This requires reconfiguring the inductor and diode connections per the recommended topology; output polarity is inverted, and regulation accuracy remains within ±4% under specified conditions.
What is the thermal resistance (RθJA) of LM2574DW-ADJR2 in its SOIC-14 package?
The junction-to-ambient thermal resistance (RθJA) for LM2574DW-ADJR2 in the NPA (14-pin SOIC) package is 77.1 °C/W, measured on a standard 4-layer JEDEC board per Section 6.4 Thermal Information in the SNVS104E datasheet. This value assumes proper PCB copper area and grounding per Layout Guidelines in Section 10.
LM2574DW-ADJR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-ADJR2 FAQ
1.How can I place an order for LM2574DW-ADJR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574DW-ADJR2 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-ADJR2 reliable?
The price and inventory of LM2574DW-ADJR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574DW-ADJR2 is usually 5 days.
3.What payment methods are accepted for LM2574DW-ADJR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574DW-ADJR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574DW-ADJR2?
LM2574DW-ADJR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574DW-ADJR2 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-ADJR2?
For technical support, including LM2574DW-ADJR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574DW-ADJR2 requirements.
6.How does Aetrix verify that LM2574DW-ADJR2 is sourced from the original manufacturer or authorized distributors?
All LM2574DW-ADJR2 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-ADJR2 meets industry standards.
7.What is the process for return or replacement of LM2574DW-ADJR2?
All LM2574DW-ADJR2 units undergo pre-shipment inspection (PSI). If there is an issue with LM2574DW-ADJR2, 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-ADJR2 part is unused and in its original packaging.
Return procedure for LM2574DW-ADJR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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