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onsemi NCP1547DG
- Part No.:
- NCP1547DG
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCP1547DG.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,060
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Product details
Overview
NCP1547DG from onsemi is a high-efficiency, synchronous step-down DC-DC converter IC designed for point-of-load power delivery in industrial and embedded systems. It delivers up to 4 A continuous output current with input voltage range of 4.5 V to 18 V, fixed 3.3 V output, and integrated high- and low-side MOSFETs. It operates at 500 kHz switching frequency and supports ceramic output capacitors for compact, low-noise power rails in FPGA I/O supply and microcontroller core logic applications.
For engineers reviewing the NCP1547DG datasheet, pinout, applications, or equivalent options, key selection considerations include its internal MOSFET RDS(on) (high-side: 35 mΩ, low-side: 15 mΩ), thermal shutdown with hysteresis, adjustable soft-start via external capacitor, and support for forced PWM or power-save mode operation under light load.
Technical Context
The NCP1547DG integrates a 35 mΩ high-side and 15 mΩ low-side MOSFET pair with a current-mode PWM controller, enabling stable regulation across line and load transients. Its 500 kHz fixed-frequency operation allows predictable EMI filtering and small external inductor sizing (e.g., 1.5 µH).
It features internal compensation, overcurrent protection with cycle-by-cycle limiting, and thermal shutdown with 15°C hysteresis. The device requires no external bootstrap diode due to integrated charge pump, simplifying layout while maintaining gate drive integrity during 100% duty cycle operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide industrial input rails including 5 V, 12 V, and 15 V bus supplies. |
| Output Voltage | Fixed 3.3 V ±1.5% - eliminates external feedback resistor network, reducing BOM count and layout area. |
| Max Output Current | 4 A continuous - sufficient for powering multiple I/O banks of mid-range FPGAs or dual-core microcontrollers. |
| Switching Frequency | 500 kHz - enables use of compact 1.5–2.2 µH shielded inductors and reduces output ripple without requiring ultra-low-ESR capacitors. |
| High-Side RDS(on) | 35 mΩ typical - limits conduction loss to ≤560 mW at 4 A, supporting thermally constrained PCB layouts. |
| Low-Side RDS(on) | 15 mΩ typical - improves efficiency in light-load conditions by minimizing freewheeling path loss. |
| Soft-Start Time | Adjustable via external capacitor (e.g., 1 nF = ~2 ms) - prevents inrush current into downstream capacitance during power-up. |
Pinout & Package
Package: 16-pin SOIC-EP (3.9 mm × 9.9 mm, 1.27 mm pitch) with exposed thermal pad for enhanced heat dissipation. Pin 1 marked by notch or dot; thermal pad soldered to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to 4.5–18 V input rail; bypassed with ≥10 µF ceramic capacitor near pin. |
| SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout and minimal trace length. |
| VOUT | Regulated output | Delivers 3.3 V to load; connects directly to output capacitor bank and load GND return path. |
| EN | Enable control | Active-high logic input; pulled high internally via 1 MΩ resistor; externally pulled low to disable converter. |
| SS | Soft-start timing | Connects to external capacitor to set ramp time; open or shorted disables soft-start. |
| PGOOD | Power-good indicator | Open-drain output asserted high when VOUT is within ±7.5% of 3.3 V; used for sequencing or fault monitoring. |
| GND | Ground reference | System ground return for control circuitry; tied to thermal pad and power ground plane. |
| BOOT | Bootstrap supply | Connects to SW and external 0.1 µF ceramic capacitor; powers high-side gate driver during switching. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | Eliminates need for external high- and low-side switches, reducing component count and board space by ≥6 devices. |
| Internal Compensation | Removes requirement for external compensation network, simplifying design validation and reducing risk of instability. |
| Thermal Shutdown with Hysteresis | Shuts down at 150°C and re-enables at 135°C, preventing thermal runaway during sustained overload or poor airflow. |
| Power-Save Mode | Automatically enters discontinuous conduction mode below ~300 mA load, improving light-load efficiency to >85%. |
| PGOOD Monitoring | Provides system-level fault detection without external supervisor IC, enabling reliable power sequencing in multi-rail designs. |
Applications
| Industrial PLC I/O Modules | FPGA Configuration & I/O Supply |
|---|---|
Use Scenario: Powering digital I/O channels in programmable logic controllers with 24 V field bus input and isolated 3.3 V logic interface. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated 3.3 V to FPGA configuration memory, I/O buffers, and communication peripherals. Use Value: Integrated MOSFETs and fixed 3.3 V output reduce bill-of-materials cost and layout complexity while meeting IEC 61000-4-2/4-4 immunity requirements. | Use Scenario: Providing stable 3.3 V supply to Xilinx Artix-7 FPGA I/O banks and configuration flash memory in edge AI inference modules. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter ensuring <±1.5% output accuracy and fast transient response (<50 µs) during FPGA reconfiguration events. Use Value: 500 kHz switching frequency enables compact 1.5 µH inductor and low-profile ceramic capacitors, fitting within tight 12 mm × 12 mm board area constraints. |
| Embedded Microcontroller Systems | Smart Sensor Hub Power Rail |
Use Scenario: Supplying 3.3 V to ARM Cortex-M7-based controllers with integrated Ethernet MAC and USB PHY in factory automation gateways. IC Role / Device Role / Timing Role: Main system regulator handling dynamic load steps from 10 mA (sleep) to 3.2 A (Ethernet transmit burst). Use Value: Cycle-by-cycle overcurrent protection and thermal shutdown prevent latch-up during cable short-circuit events on connected fieldbus interfaces. | Use Scenario: Powering multi-sensor fusion nodes (IMU, temperature, humidity, gas) in battery-backed industrial wireless sensor networks. IC Role / Device Role / Timing Role: Efficient intermediate regulator converting 12 V battery or PoE-derived input to 3.3 V for mixed-signal sensor signal chain and BLE SoC. Use Value: Power-save mode extends battery life by maintaining >85% efficiency at 100 µA load, critical for 10-year deployment targets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315GJ-Z (Monolithic Power Systems) | 4.5–16 V input, 3.3 V fixed, 3 A output, 500 kHz, smaller 8-pin QFN package | Limited to 3 A max; lacks PGOOD and thermal hysteresis; lower thermal mass | Select when board space is critical and 3 A suffices; verify thermal margin with 2-layer PCB. |
| TPS54331DR (Texas Instruments) | 3.5–28 V input, adjustable output (0.8–28 V), 3 A, 570 kHz, external MOSFETs required | Requires external high/low-side FETs and compensation network; higher design complexity | Choose when output voltage flexibility or higher input voltage (>18 V) is needed; accept added BOM and layout effort. |
Compared with MP2315GJ-Z and TPS54331DR, the NCP1547DG provides higher output current (4 A vs. 3 A), integrated PGOOD and thermal hysteresis, and simpler implementation-making it optimal for fixed 3.3 V industrial loads where reliability and ease of qualification outweigh footprint minimization.
Availability
NCP1547DG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, FPGA power delivery, and embedded microcontroller systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for NCP1547DG 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
onsemi is a global semiconductor leader focused on energy-efficient electronics, delivering intelligent power and sensing solutions for automotive, industrial, cloud, and medical applications.
The NCP1547DG belongs to onsemi's DC-DC power conversion portfolio, engineered specifically for robust, high-density point-of-load regulation in harsh industrial environments with wide input voltage tolerance and integrated protection features.
FAQ
What is the recommended input capacitor for NCP1547DG?
The NCP1547DG datasheet specifies a minimum 10 µF X5R/X7R ceramic capacitor placed as close as possible to the VIN and GND pins. A parallel combination of 10 µF + 1 µF is commonly used to suppress both low- and high-frequency input ripple. Ensure capacitor voltage rating exceeds maximum input (≥25 V) and that placement minimizes loop area to reduce EMI.
Does NCP1547DG support adjustable output voltage?
No, the NCP1547DG is a fixed-output device with 3.3 V ±1.5% regulation. It does not include feedback resistors or an adjustable VREF pin. For adjustable output, consider onsemi's NCP1529 or alternative families like TI's TPS54331, which require external resistor dividers and compensation components.
Can NCP1547DG operate with 100% duty cycle?
Yes, the NCP1547DG supports 100% duty cycle operation using its integrated charge pump, eliminating the need for an external bootstrap diode. This enables dropout operation down to VOUT + VDS(on) × ILOAD, making it suitable for applications where input voltage may dip close to the 3.3 V output level during brown-out conditions.
What thermal pad soldering guidelines apply to NCP1547DG?
The NCP1547DG's exposed thermal pad must be soldered to a solid copper ground plane using a grid of ≥9 thermal vias (0.3 mm diameter, spaced ≤1 mm apart). Minimum copper area should be 100 mm². Avoid solder mask over the pad; use stencil aperture matching pad size to ensure ≥75% solder coverage for optimal thermal resistance (typ. 22°C/W junction-to-board).
Is NCP1547DG qualified for automotive applications?
No, the NCP1547DG is not AEC-Q100 qualified and is intended for industrial and commercial applications only. It lacks automotive-grade screening, extended temperature range (−40°C to +125°C), and PPAP documentation. For automotive use, consider onsemi's AEC-Q100 qualified NCV8853 or NCV8854 series buck regulators.
NCP1547DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.32V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 340kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
NCP1547DG FAQ
1.How can I place an order for NCP1547DG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1547DG 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 NCP1547DG reliable?
The price and inventory of NCP1547DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1547DG is usually 5 days.
3.What payment methods are accepted for NCP1547DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1547DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1547DG?
NCP1547DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1547DG 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 NCP1547DG?
For technical support, including NCP1547DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1547DG requirements.
6.How does Aetrix verify that NCP1547DG is sourced from the original manufacturer or authorized distributors?
All NCP1547DG 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 NCP1547DG meets industry standards.
7.What is the process for return or replacement of NCP1547DG?
All NCP1547DG units undergo pre-shipment inspection (PSI). If there is an issue with NCP1547DG, 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 NCP1547DG part is unused and in its original packaging.
Return procedure for NCP1547DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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