Item specifics
Description
The NCP3170ADR2G is a flexible synchronous PWM step-down switching regulator from onsemi, featuring a current-mode control architecture with an integrated high-side PMOS switch and low-side NMOS switch. It operates from a 4.5V to 18V input voltage range with an adjustable output voltage from 0.8V to 17.28V, delivering up to 3A continuous output load current at a fixed 500kHz switching frequency. Available in a SOIC-8 package, the NCP3170ADR2G integrates soft-start, power good detection, and switching frequency setting internally, requiring a minimum number of external components for a complete buck power supply design. It is widely used in set-top boxes, LCD monitors/TVs, telecom/networking equipment, PCIe graphics cards, and point-of-load (POL) DC/DC converters.
| Model | NCP3170ADR2G |
| Device Type | Synchronous PWM Buck Regulator |
| Topology | Buck |
| Control Mode | Current Mode |
| Input Voltage Range | 4.5V ~ 18V |
| Output Voltage Range | 0.8V ~ 17.28V (Adjustable) |
| Output Current | 3.0 A (Continuous) |
| Switching Frequency | 500 kHz (Fixed) |
| High-Side MOSFET RDS(on) | 90 mΩ |
| Low-Side MOSFET RDS(on) | 25 mΩ |
| Efficiency (Typical) | 92% |
| Duty Ratio Range | 8% ~ 92% |
| Output Voltage Accuracy | 1.5% (Initial) |
| Quiescent Current | 1.7 mA |
| Soft-Start | 4 ms (Internal Fixed) |
| Synchronous Rectifier | Yes |
| Number of Outputs | 1 |
| Output Type | Adjustable |
| Switch | Built-in |
| Protections | Cycle-by-Cycle Current Limit, Short Circuit, OVP, Thermal Shutdown, UVLO |
| Other Features | Power Good Indication, Enable Control, POR, Light Load Efficiency Mode |
| Operating Temp (TA) | -40℃ ~ +85℃ |
| Package | SOIC-8 |
NCP3170ADR2G Typical Applications
Point of Load (POL) DC/DC Regulator
Set-Top-Box (STB)
LCD-TV / DTV Power
PCIe Graphics Cards
Cable Modems
DVD/Blu-ray Drives and Hard Disks
Telecom / Datacom / Networking Equipment
FAQs:
Q: What are the efficiency and switching frequency?
A: Typical conversion efficiency reaches 92% with a fixed 500kHz switching frequency. The device integrates 90mΩ high-side PMOS and 25mΩ low-side NMOS switches for reduced conduction losses.
Q: What protection features are integrated?
A: Cycle-by-cycle current limiting, short circuit protection, overvoltage protection, thermal shutdown, and input undervoltage lockout (UVLO). The UVLO threshold is typically 4.13V, preventing improper operation from insufficient input voltage.
Q: How is the output voltage set?
A: The NCP3170ADR2G is the adjustable output version with 0.8V to 17.28V range, set via external feedback resistor divider (FB pin). Internal 1.5% precision reference and current-mode compensation simplify loop design.
Q: Does it support light-load efficiency mode?
A: Yes. The device features Light Load Efficiency mode, automatically optimizing efficiency under light-load conditions for standby-power-sensitive applications.
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