Last week, Dialog Semiconductor released their newest PMIC (power management IC) designed to manage power for IoT devices that need to extend their battery life (presumably most of them).
The DA9070 is a nano-powered PMIC designed to power, IoT equipment. One of the major focuses of this product is wearables such as fitness trackers, but IoT here could also mean building automation or smart home applications or even key fobs.
The aim is to extend the life of small batteries, especially in those applications where there’s some kind of always-on functionality (say, a clock for a wearable or a sensor for home automation).
This IC consumes very low quiescent current while maintaining voltage regulation required by the components in the system.
To accomplish this, the DA9070 IC features the following components:
- Charger for rechargeable battery
- Boost regulator to power display or high-voltage sensor
- Buck regulator to power the system’s microcontroller (MCU)
- 3 linear regulators to power other I/Os or sensors
- Analog battery monitor to create a fuel gauge for the device
According to Faisal Ahmad, Dialog Semiconductor’s Director of Marketing for their power management and audio products within the mobile systems business unit, the fuel gauge, is an important feature. Oftentimes, small IoT devices have a bar indicator for gauging how much battery remains (e.g., 3 bars indicates ~75% battery life remaining where 2 bars indicates ~50%), this is because fuel gauges usually consume a lot of currents, draining the battery that they’re measuring.
Instead, Dialog’s fuel gauge only consumes 4μA and actually runs in the system MCU so it’s very low-cost. It takes voltage and current information from the DA9070 PMIC and creates the fuel gauge.