Boost switching regulator with low ripple mode & low quiescent current

Featuring a low quiescent current of 70nA, 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 ‘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 0.6V to 5.5V, with a startup capability as low as 0.8V, making it highly versatile across various application contexts. The regulator is available with fixed output voltages internally configured between 1.8V and 5.0V, 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 VIN-VOUT disconnect options, catering to diverse system-level requirements.

The NC4650 is delivered in an ultra-compact WLCSP-6-ZA1 package, ideal for space-constrained, miniaturised electronic applications, including IoT sensors, Edge-computing devices, battery-operated alarms and security sensors, wearable healthcare technology, and smartwatches. For rapid prototyping and development, evaluation boards featuring the device are available, ensuring seamless integration into your projects.

NC4650 specifications:

• Input voltage range (maximum rating): 0.6V to 5.5V (6.5V)
• Startup voltage: typ. 0.8V
• Output voltage range: 1.8V to 5.0V (internally fixed)
• Quiescent current (VOUT): normal / low ripple mode: typ. 70nA / typ. 90μA
• Shutdown current: typ. 50nA
• Efficiency (VIN=1.5V, VOUT = 3.3V, IOUT=1 μA): typ. 85%
• Switch current limit: typ. 1A (VSET ≥ 2.5 V), typ. 0.65A (VSET < 2.5V)
• Thermal shutdown function: detection / release: typ. 150°C / typ. 100°C
• Soft start function
• Buck operation or pass-through when VIN > VOUT
• Manual switching between normal mode & low ripple mode via MODE Pin
• Multiple versions for shutdown behaviour
• Package NC4650ZA1: WLCSP-6-ZA1
• Dimensions: 1.3 x 0.92mm typ., t = 0.4mm Max
• Datasheet NC4650: consumer version