Renesas ISL9122A buck-boost switching regulator

Renesas Electronics has introduced the ISL9122A — a flexible buck-boost switching regulator with bypass mode that provides ultralow quiescent current (IQ) for powering sensors, microcontrollers (MCUs), wireless devices and other system components.

Operating with battery output from 1.8 to 5.5 V, the product is designed to extend the battery life of smart IoT devices powered by coin-cell, lithium and multiple series alkaline batteries. Target applications include wireless earbuds, fitness bands, smart watches, water and gas meters, portable medical devices and a wide range of battery-operated smart IoT devices.

The buck-boost switching regulator implements dynamic voltage scaling (DVS) in I²C programmable 25 mV steps to optimise system power consumption. The regulator’s power boost up to 5.375 V maximises RF capabilities of IoT devices across their battery range, while its PFM and PWM functionality maximises efficiency over the whole output current range. In forced PWM mode, the regulator always switches at 2.5 MHz frequency, which improves EMI performance of the system.

With the growth of IoT wireless connectivity applications, the buck-boost regulator’s fast transitions from no load to full load make it suitable for powering the latest generation of devices.