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onsemi NCV2574DW-ADJR2
- Part No.:
- NCV2574DW-ADJR2
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
NCV2574DW-ADJR2.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,621
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Product details
Overview
NCV2574DW-ADJR2 from ON Semiconductor is a monolithic non-synchronous step-down (buck) DC-DC switching regulator delivering 0.5 A output current with adjustable output voltage from 1.23 V to 37 V, ±4% output voltage tolerance over line and load, and 52 kHz fixed-frequency internal oscillator. It operates from 40 V input and integrates thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible shutdown control - used in industrial power supplies requiring compact, high-efficiency regulation.
For engineers reviewing the NCV2574DW-ADJR2 datasheet, pinout, applications, or equivalent options, key selection criteria include its 40 V max input rating, 0.5-A continuous output capability, feedback reference voltage of 1.23 V, SOIC-14 package thermal performance (RθJA = 77.1 °C/W), and compatibility with standard off-the-shelf inductors.
Technical Context
The NCV2574DW-ADJR2 implements a fixed-frequency PWM controller with internal 52-kHz oscillator, error amplifier referenced to 1.23 V, and integrated 0.5-A NPN power switch. Its non-synchronous architecture requires an external flyback diode and uses feedback voltage sensing at the FB pin to regulate output via resistor divider.
It features undervoltage lockout, thermal shutdown, and cycle-by-cycle current limiting for fault protection. The ON/OFF pin enables TTL-level shutdown with 50 μA standby current, and the device supports both continuous and discontinuous conduction modes depending on inductor value and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.5 A continuous - supports mid-power industrial loads without external current boosting |
| Input Voltage Range | Up to 40 V - suitable for 24-V and 36-V industrial bus rails with margin |
| Feedback Reference Voltage | 1.23 V ±1.4% - sets precise output via external resistor divider; enables 1.23–37 V adjustment range |
| Oscillator Frequency | 52 kHz ±10% - fixed frequency simplifies EMI filtering and inductor selection |
| Output Voltage Tolerance | ±4% over line/load/temp - ensures stable regulation across operating conditions without trimming |
| Standby Quiescent Current | 50 μA typical - enables low-power shutdown mode for energy-sensitive systems |
| Saturation Voltage | 1.2 V max at 0.5 A - defines minimum dropout and impacts efficiency at low VOUT |
| Thermal Resistance (RθJA) | 77.1 °C/W (SOIC-14) - determines maximum power dissipation before thermal shutdown under natural convection |
Pinout & Package
NCV2574DW-ADJR2 is housed in a 14-pin SOIC (NPA) package measuring 8.992 mm × 7.498 mm, optimized for thermal performance and PCB layout simplicity in industrial power designs.
| 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 reference |
| OUTPUT (Pin 12) | Power switch emitter | Switching node tied to inductor and diode cathode; carries pulsed 0.5-A current |
| ON/OFF (Pin 5) | Enable/disable control | TTL-compatible input: ≤1.2 V = active, ≥1.4 V = shutdown; 50 μA standby draw |
| VIN (Pin 10) | Input supply | High-side transistor collector; accepts up to 40 V; requires short, low-inductance path to CIN |
| PWR_GND (Pin 6) | Power ground | Return path for high-current switching loop; must be low-impedance connection to CIN/COUT grounds |
| SIG_GND (Pin 4) | Signal ground | Reference for internal bandgap, error amp, and logic; connect to PWR_GND at single point near IC |
| NC (Pins 1, 2, 7, 8, 9, 11, 13, 14) | No internal connection | Internally unconnected but soldered to PCB for mechanical stability and thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.5-A NPN switch | Eliminates need for external power transistor; reduces BOM count and layout complexity |
| Fixed 52-kHz oscillator | Enables predictable EMI profile and simplifies filter design using standard inductor values |
| ±4% output voltage accuracy | Meets tight regulation requirements for analog circuitry and microcontroller I/O without post-regulation |
| TTL shutdown with 50 μA standby | Supports low-power sleep modes in battery-backed or energy-harvesting systems |
| Thermal shutdown + current limit | Provides autonomous fault recovery without external protection circuitry |
| SOIC-14 thermal design | RθJA = 77.1 °C/W allows 1.2 W dissipation at 50°C ambient - sufficient for most 0.5-A buck applications |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24-V vehicle battery powers 5-V MCU, CAN transceiver, and sensors in door module. IC Role / Device Role / Timing Role: Primary buck regulator converting 12–28 V input to stable 5 V for digital subsystems. Use Value: 40 V input rating accommodates load dump transients; ±4% output tolerance ensures reliable MCU operation. |
Use Scenario: On-board diagnostics unit draws 0.4 A at 3.3 V from 12-V rail with intermittent operation. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 3.3 V with ON/OFF pin enabling duty-cycled operation. Use Value: 50 μA standby current minimizes quiescent drain during sleep; SOIC-14 footprint fits constrained PCB space. |
| Factory Automation I/O Module | Medical Sensor Interface |
|
Use Scenario: DIN-rail mounted PLC I/O card requires isolated 12 V and 5 V rails from 48-V DC supply. IC Role / Device Role / Timing Role: Pre-regulator stage stepping 48 V down to 12 V for downstream linear regulators and isolation circuits. Use Value: High efficiency (>88% at 12 V out) reduces heat buildup in sealed enclosures; 52 kHz frequency avoids audible noise. |
Use Scenario: Portable patient monitor powers analog front-end and ADC from rechargeable Li-ion battery (max 4.2 V). IC Role / Device Role / Timing Role: Buck-boost capable topology (via external configuration) maintains 3.3 V output as battery discharges from 4.2 V to 3.0 V. Use Value: Adjustable 1.23 V reference enables precise low-voltage setpoints; thermal shutdown prevents overheating in handheld enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-ADJ/NOPB | Same architecture, 8-pin PDIP package, RθJA = 60.4 °C/W, 45 V max input, no automotive qualification | Lower thermal resistance but larger footprint; lacks AEC-Q100 stress testing and extended temperature support | Prefer for cost-sensitive non-automotive prototypes where board space permits PDIP |
| MP1584EN-LF-Z | 40 V input, 3 A output, 1.5 MHz switching, synchronous rectification, 8-pin SOIC | Higher current and frequency enable smaller magnetics; lacks built-in current limit flag and has different shutdown polarity | Choose when scaling output current beyond 0.5 A or reducing solution size is critical; requires layout redesign |
Compared with LM2574N-ADJ/NOPB, NCV2574DW-ADJR2 offers automotive-grade reliability and SOIC-14 thermal performance; compared with MP1584EN-LF-Z, it trades higher current and frequency for simpler design, lower EMI, and proven robustness in harsh environments.
Availability
NCV2574DW-ADJR2 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical sensor interface applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for NCV2574DW-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
ON Semiconductor is a global semiconductor supplier focused on energy-efficient electronics, with leadership in automotive, industrial, and cloud power solutions.
The NCV2574DW-ADJR2 belongs to the NCV2574x automotive-grade SIMPLE SWITCHER® buck regulator family, designed specifically for robust, high-reliability power conversion in safety-critical vehicle subsystems and industrial controls.
FAQ
What is the maximum input voltage rating for the NCV2574DW-ADJR2?
NCV2574DW-ADJR2 has a maximum input voltage rating of 40 V, as specified in its absolute maximum ratings table. This rating applies across the full operating temperature range and supports use in 24-V and 36-V industrial and automotive systems with transient margin. Exceeding 40 V risks permanent damage, even briefly.
Does the NCV2574DW-ADJR2 require an external diode, and what type is recommended?
Yes, NCV2574DW-ADJR2 requires an external Schottky diode connected between the OUTPUT pin and VOUT. A 3-A, 40-V Schottky diode such as the SB340 or MBR340 is recommended to minimize forward voltage drop and switching losses. The diode must handle peak currents up to 1.6 A and be placed close to the IC to reduce parasitic inductance.
How is the output voltage set on the NCV2574DW-ADJR2?
The NCV2574DW-ADJR2 uses a resistor divider from VOUT to GND, with the FB pin connected to the divider midpoint. Output voltage is calculated as VOUT = 1.23 V × (1 + R1/R2), where R2 connects FB to GND. For example, R1 = 10 kΩ and R2 = 1.24 kΩ yields ~11.3 V. The 1.23 V reference has ±1.4% initial tolerance and ±0.02%/°C drift.
Can the NCV2574DW-ADJR2 be used in a buck-boost configuration?
Yes, NCV2574DW-ADJR2 can be configured as a buck-boost (inverting) regulator by connecting the OUTPUT pin to ground and taking output from the inductor-diode junction. This requires reversing diode polarity and adjusting feedback placement. The datasheet provides Figure 20 as a validated buck-boost schematic, supporting outputs from −1.23 V to −37 V with same 0.5-A capability.
What thermal derating applies to the NCV2574DW-ADJR2 in SOIC-14 package?
With RθJA = 77.1 °C/W, NCV2574DW-ADJR2 dissipates up to 1.2 W before reaching 125°C junction temperature at 50°C ambient. At 0.5-A load and 12-V output from 24-V input, typical dissipation is ~0.6 W - well within safe limits. For >1 W dissipation, add copper pour under exposed pad (if present) or use forced airflow per JEDEC JESD51-7 guidelines.
NCV2574DW-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
NCV2574DW-ADJR2 FAQ
1.How can I place an order for NCV2574DW-ADJR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV2574DW-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 NCV2574DW-ADJR2 reliable?
The price and inventory of NCV2574DW-ADJR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV2574DW-ADJR2 is usually 5 days.
3.What payment methods are accepted for NCV2574DW-ADJR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV2574DW-ADJR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV2574DW-ADJR2?
NCV2574DW-ADJR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV2574DW-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 NCV2574DW-ADJR2?
For technical support, including NCV2574DW-ADJR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV2574DW-ADJR2 requirements.
6.How does Aetrix verify that NCV2574DW-ADJR2 is sourced from the original manufacturer or authorized distributors?
All NCV2574DW-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 NCV2574DW-ADJR2 meets industry standards.
7.What is the process for return or replacement of NCV2574DW-ADJR2?
All NCV2574DW-ADJR2 units undergo pre-shipment inspection (PSI). If there is an issue with NCV2574DW-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 NCV2574DW-ADJR2 part is unused and in its original packaging.
Return procedure for NCV2574DW-ADJR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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