Fully integrated nanopower PMICs aim at low power IoT applications

November 19, 2018 //By Nick Flaherty
Fully integrated nanopower PMICs aim at low power IoT applications
Dialog Semiconductor showed its first fully-integrated nanopower power management ICs (PMICs) for IoT applications at Electronica last week.

The DA9070 and DA9073 extend battery life by drawing under 1μA quiescent current for each of its step-down regulators that power always-on components within the system, and combine all key power management functions to reduce board area by 25 percent compared to discrete regulators. Developers also have the option of creating a battery fuel gauge solution with the DA9070 using the integrated voltage and current monitors.

Today’s ‘always-on’ IoT devices such as fitness trackers, smartwatches and smart home products are expected to spend less time tethered to a charger, but expanding feature sets present new challenges to battery life. The DA9070 combines a linear charger with Power Path management, ultralow quiescent current (Iq) buck regulator and LDO/Load Switches, wide output voltage boost regulator, analog battery monitor, watchdog and protection features in an I 2C configurable compact WLCSP package.

Several power saving modes increase battery life whether the product sits on the shelf or is in operation. Further savings in power are achieved with the ultra-low Iq buck converter that is efficient down to 10 μA load currents and low Iq LDOs. The uncommitted inputs of LDOs can be connected to either the battery or buck output. The integrated, high-efficiency boost regulator supports both sensors and display supply needs with a wide range configurable output voltage. DA9070 provides charge current up to 500 mA to speed up the charge cycle. The charge profile is programmable by external resistors or in software, allowing either stand-alone operation or host control.

DA9070 includes dynamic power path management which automatically balances current delivered between the system and the battery. Suitable for small battery applications, the battery monitor facilitates on-demand battery voltage and discharge current monitors to an external MCU’s ADC for supporting software fuel gauging.

“As consumer demands continue to push design boundaries, system designers are now faced with a complex challenge of extending battery life even further while adding new feature sets, all in a small form

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