Buck-boost DC/DC converter extends wireless devices’ battery life

Engineered with low quiescent current, the ISL9122A buck-boost DC/DC converter powers sensors, microcontrollers, wireless and IoT devices.

Renesas introduced the ISL9122A flexible buck-boost switching regulator with bypass mode that provides low quiescent current (IQ) of less than 1.3 microA and low shutdown mode current of 7nA to extend battery life. Operating battery output is from 1.8V to 5.5V,with an adjustable output voltage range from 1.8V to 5.375V in 25mV increments.

The ISL9122A extends the battery life of smart IoT devices powered by coin-cell, lithium and multiple series alkaline batteries. Target applications include wireless ear buds, fitness bands, smart watches, water and gas meters, portable medical devices, and a range of battery-operated smart IoT devices.

The ISL9122A buck-boost switching regulator implements dynamic voltage scaling (DVS) in I2C programmable 25mV steps to optimise system power consumption. The regulator’s power boost up to 5.375V maximises RF capabilities of IoT devices across the battery range. Its PFM and PWM functionality maximises efficiency over the whole output current range. In forced PWM mode, the regulator always switches at 2.5MHz frequency, which improves EMI performance of the system, adds Renesas.

Efficiency at light load is 84per cent at 10 microA and 97 per cent peak efficiency to reduce power drain and heat build up. There is an automatic and selectable forced bypass power saving mode to reduce IQ.

Features include over-current, short-circuit and overheating protection.

Max output current is up to 500mA (Vout = 3.3V, Vin = 3.6V).

The ISL9122A buck-boost switching regulator is supplied in a small footprint measuring 1.8 x 1.0mm WLCSP package or 3.0 x 2.0mm DFN package.

The regulator only requires three external components: an inductor, and input and output capacitors

The ISL9122A is available now from Renesas’ worldwide distributors.

There are also two ISL9122A evaluation boards that allow designers to evaluate device features and performance are also available: The ISL9122AIRN-EVZ with 3.3V default output (DFN) and ISL9122AIIN-EVZ with 3.3V default output (WLCSP).


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