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onsemi NCV2574DW-ADJR2G
- Part No.:
- NCV2574DW-ADJR2G
- Manufacturer:
- onsemi
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
NCV2574DW-ADJR2G.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,775
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Product details
Overview
NCV2574DW-ADJR2G from ON Semiconductor is a monolithic 0.5-A non-synchronous step-down (buck) DC-DC switching regulator with adjustable output (1.23 V to 37 V), 52-kHz fixed-frequency oscillator, and wide 40-V input voltage range. It integrates internal frequency compensation, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - used in industrial power supplies for distributed 5 V/12 V rail generation.
For engineers reviewing the NCV2574DW-ADJR2G datasheet, pinout, applications, or equivalent options, key selection criteria include feedback reference accuracy (±4% over line/load), standby current (50 μA typ), saturation voltage (1.2 V max at 0.5 A), thermal resistance (77.1 °C/W in SOIC-14), and compatibility with standard off-the-shelf inductors.
Technical Context
The NCV2574DW-ADJR2G implements a fixed-frequency PWM architecture with an internal 52-kHz oscillator and built-in error amplifier referenced to a 1.23-V bandgap. Its non-synchronous topology uses an integrated NPN transistor switch and requires an external catch diode and inductor.
Control logic includes TTL-level ON/OFF pin (1.2 V threshold for activation), internal current-limit protection (0.7–1.6 A peak), and thermal shutdown triggered at 150 °C junction temperature. The device operates across –40 °C to +125 °C ambient and supports input voltages up to 40 V with no external components needed for frequency compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 0.5 A DC continuous - sufficient for powering microcontrollers, sensors, and interface ICs without external current boosting. |
| Feedback voltage | 1.23 V ±2.3% - sets output via external resistor divider; enables precise programmable regulation from 1.23 V to 37 V. |
| Oscillator frequency | 52 kHz ±10% - fixed frequency simplifies EMI filtering and allows use of low-cost, high-saturation inductors. |
| Saturation voltage | 1.2 V max at 0.5 A - limits conduction loss and impacts minimum dropout and efficiency at high load. |
| Standby current | 50 μA typical - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Thermal resistance | 77.1 °C/W (SOIC-14) - determines required PCB copper area for passive heatsinking at full load. |
| Input voltage range | 40 V max - supports 24-V and 36-V industrial bus rails with margin for transients. |
Pinout & Package
NCV2574DW-ADJR2G is housed in a 14-pin SOIC (NPA) package measuring 8.992 mm × 7.498 mm, optimized for thermal performance and layout simplicity in industrial PCBs.
| 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 catch diode; high dv/dt switching node requiring careful routing and ground return. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible; <1.2 V enables regulation, >1.4 V disables with 50-μA standby current - supports system-level power sequencing. |
| VIN (Pin 10) | Power input | Connects to bulk input capacitor; path to CIN and PWR_GND must be short to minimize switching noise and voltage spikes. |
| PWR_GND (Pin 6) | Power ground | High-current return for switch and input/output capacitors; separate from SIG_GND to avoid noise coupling into control circuitry. |
| SIG_GND (Pin 4) | Signal ground | Reference for internal bandgap, error amp, and logic; ties to system ground but kept isolated from noisy power return paths. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated current limit | 0.7–1.6 A peak - protects against short-circuit and overload without external sensing resistors. |
| Thermal shutdown | 150 °C junction trip - prevents permanent damage during sustained overload or poor heatsinking. |
| Fixed-frequency oscillator | 52 kHz ±10% - enables predictable EMI spectrum and eliminates need for external timing components. |
| Internal frequency compensation | Single-pole compensation - reduces external component count and ensures stability with standard inductor/capacitor combinations. |
| Low-quiescent standby mode | 50 μA typical - extends hold-up time in backup power applications and reduces system idle power. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
Use Scenario: Generating stable 5 V or 12 V from a 24-V vehicle battery or 36-V industrial bus under load transients and temperature extremes. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated DC power to MCU, CAN transceivers, and sensor interfaces. Use Value: 40-V input rating accommodates load-dump transients; ±4% output tolerance ensures reliable digital logic operation across –40 °C to +125 °C. | Use Scenario: Powering microcontroller subsystems in body electronics where space and BOM count are constrained. IC Role / Device Role / Timing Role: Compact, self-contained step-down converter eliminating need for external compensation or timing networks. Use Value: SOIC-14 footprint and 4-component design reduce board area and assembly cost versus discrete solutions. |
| Point-of-Load Converters | Legacy Equipment Retrofit Supplies |
Use Scenario: Replacing linear regulators on aging equipment to improve efficiency and reduce thermal stress on PCBs. IC Role / Device Role / Timing Role: High-efficiency buck replacement for 78xx-style linear regulators, driving up to 0.5 A with minimal heatsink. Use Value: 77%–88% efficiency at full load cuts copper trace heating and eliminates dedicated heatsinks in enclosed enclosures. | Use Scenario: Adding regulated auxiliary power to legacy instrumentation using existing 24-V or 48-V supply rails. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured for custom voltages (e.g., 3.3 V, 9 V) without redesigning power stage. Use Value: 1.23-V feedback reference enables precise output setting via two resistors - no trimming or calibration required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574ADJ/NOPB | Same architecture and pinout; TI version rated for 0°C to +70°C commercial temp range only. | Not qualified for automotive or extended industrial environments; lacks AEC-Q100 qualification. | Select NCV2574DW-ADJR2G when operating above 70°C ambient or requiring automotive-grade reliability. |
| MP1584EN-LF-Z | Higher 3-A output, 1.5-MHz switching, synchronous rectification; different pinout and control scheme. | Requires PCB redesign; better suited for compact, high-efficiency designs where size and ripple matter more than cost. | Choose MP1584EN-LF-Z only if upgrading to higher current or lower ripple is required - not a drop-in replacement. |
Compared with LM2574ADJ/NOPB, NCV2574DW-ADJR2G adds extended temperature support and automotive qualification; compared with MP1584EN-LF-Z, it trades higher current and frequency for simpler layout, lower EMI, and proven robustness in harsh environments - making it optimal for cost-sensitive, thermally demanding industrial buck conversion.
Availability
NCV2574DW-ADJR2G is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and legacy equipment power supply upgrades requiring stable component supply, long lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for NCV2574DW-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
ON Semiconductor is a global semiconductor supplier focused on energy-efficient electronics, delivering power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The NCV2574DW-ADJR2G belongs to ON Semiconductor's NCV-series automotive-grade power management portfolio, designed specifically for ruggedized DC-DC conversion in safety-critical and thermally demanding environments.
FAQ
What is the maximum input voltage rating for the NCV2574DW-ADJR2G?
The NCV2574DW-ADJR2G 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 allows safe operation with 24-V and 36-V industrial or automotive supply rails, including transient overvoltage conditions. Exceeding 40 V may cause permanent damage. The NCV2574DW-ADJR2G is not rated for the 60-V HV variant - that capability belongs to the NCV2574HV family members.
Does the NCV2574DW-ADJR2G require external compensation components?
No, the NCV2574DW-ADJR2G integrates internal frequency compensation and does not require external compensation components. Its design uses a single-pole compensation network built into the error amplifier, enabling stable operation with standard external inductors and capacitors. This simplifies layout and reduces BOM count - a key advantage over controllers requiring external Type II or Type III compensation networks. The NCV2574DW-ADJR2G achieves this while maintaining ±4% output regulation across line and load.
What is the function of the ON/OFF pin on the NCV2574DW-ADJR2G?
On the NCV2574DW-ADJR2G, the ON/OFF pin (Pin 5) provides TTL-compatible enable/disable control: pulling the pin below 1.2 V activates regulation, while raising it above 1.4 V places the device in low-power standby mode with 50 μA typical quiescent current. This pin supports system-level power sequencing, remote shutdown, and energy-saving sleep states. It must never be left floating - tie to GND for always-on operation or drive actively for controlled startup/shutdown. The NCV2574DW-ADJR2G's ON/OFF logic is inverted relative to many modern regulators.
Can the NCV2574DW-ADJR2G be used to generate negative output voltages?
Yes, the NCV2574DW-ADJR2G can be configured as a buck-boost converter to generate negative output voltages, as documented in TI's LM2574 application notes (e.g., Figure 20). In this topology, the OUTPUT pin becomes the switching node connected to an inductor and diode, while the FB pin references the negative rail. Output polarity reversal requires careful attention to grounding, component stress ratings, and feedback loop stability. While functional, this is a secondary application - the NCV2574DW-ADJR2G is primarily intended for positive step-down conversion.
What thermal considerations apply to the NCV2574DW-ADJR2G in SOIC-14 packaging?
The NCV2574DW-ADJR2G in SOIC-14 has a junction-to-ambient thermal resistance (RθJA) of 77.1 °C/W. At 0.5-A load and 1.2-V saturation, power dissipation reaches ~0.6 W - resulting in ~46 °C junction rise above ambient. To maintain TJ ≤125 °C, ambient must stay below 79 °C unless additional PCB copper or airflow is provided. Thermal relief vias under the PWR_GND pad and ≥2 cm² of 2-oz copper connected to Pin 6 significantly improve heat transfer. The NCV2574DW-ADJR2G's thermal shutdown triggers at 150 °C to prevent damage.
NCV2574DW-ADJR2G 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-ADJR2G FAQ
1.How can I place an order for NCV2574DW-ADJR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV2574DW-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 NCV2574DW-ADJR2G reliable?
The price and inventory of NCV2574DW-ADJR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV2574DW-ADJR2G is usually 5 days.
3.What payment methods are accepted for NCV2574DW-ADJR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV2574DW-ADJR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV2574DW-ADJR2G?
NCV2574DW-ADJR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV2574DW-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 NCV2574DW-ADJR2G?
For technical support, including NCV2574DW-ADJR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV2574DW-ADJR2G requirements.
6.How does Aetrix verify that NCV2574DW-ADJR2G is sourced from the original manufacturer or authorized distributors?
All NCV2574DW-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 NCV2574DW-ADJR2G meets industry standards.
7.What is the process for return or replacement of NCV2574DW-ADJR2G?
All NCV2574DW-ADJR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV2574DW-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 NCV2574DW-ADJR2G part is unused and in its original packaging.
Return procedure for NCV2574DW-ADJR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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