Nisshinbo Micro Devices NC4650

The NC4650 is an innovative boost switching regulator specifically designed for IoT edge devices, wearable technology, and compact battery-powered systems. Featuring an exceptionally low quiescent current of just 70 nA, delivering unprecedented efficiency and battery longevity and significantly reducing the operating cost and environmental impact of battery-operated products. In particular, the device excels in intermittent operation scenarios, whereby the application frequently enters sleep mode for long periods of time. Its unique “Low Ripple Mode” significantly reduces output ripple noise and enhances dynamic response under low-load conditions, while seamlessly switching between this mode and its standard, highly efficient operating mode as needed. The NC4650 accommodates a wide input voltage range from 0.6 V to 5.5 V, with a startup capability as low as 0.8 V, making it highly versatile across various application contexts. The regulator is available with fixed output voltages internally configured between 1.8 V and 5.0 V, supporting numerous system designs and requirements. In practical scenarios, such as IoT edge devices and wearable technology, the NC4650 achieves an outstanding typical efficiency of 85%, even under very low current load conditions. Furthermore, this regulator integrates essential protective features such as thermal shutdown functionality, as well as current limit capabilities, ensuring safe and reliable operation under varying environmental and operational stresses. The regulator's versatile design supports multiple functional configurations, including seamless pass-through mode, automatic output discharge, and complete V_IN-V_OUT disconnect options, catering to diverse system-level requirements.

Key features

• Input voltage range (maximum rating): 0.6 V to 5.5 V (6.5 V)
• Startup voltage: Typ. 0.8 V
• Output voltage range: 1.8 V to 5.0 V (internally fixed)
• Quiescent current (V_OUT): Normal / Low ripple mode: Typ. 70 nA / Typ. 90 μA
• Shutdown current: Typ. 50 nA
• Efficiency (V_IN=1.5 V, V_OUT = 3.3 V, I_OUT=10 μA): Typ. 85%
• Switch current limit: Typ. 1 A (V_SET ≥ 2.5 V), Typ. 0.65 A (VSET < 2.5 V)
• Thermal shutdown function: Detection / Release: Typ. 150 °C / Typ. 100 °C
• Soft start function
• Buck operation or pass-through when V_IN > V_OUT
• Manual switching between normal mode & low ripple mode via MODE Pin
• Multiple versions for shutdown behaviour

Applications

• Miniaturized electronic applications
• IoT sensors
• Edge-computing devices
• Smoke / Security detector
• Wearable healthcare technology
• Smartwatches