The DA9070 is a highly integrated PMIC for wearables and home automation that extends battery life with the smallest footprint.
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. With board area already at a premium for engineers, new power management solutions are increasingly favored over increasing battery capacity. Dialog’s DA9070 nanopower PMIC was developed to meet this growing demand.
The DA9070 has several power saving modes to increase battery life whether the product sits on the shelf or is in operation. Further power savings are achieved with the ultra-low Iq buck converter that is efficient down to 10 Î¼A 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. The DA9070 provides a 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 MCUs ADC for supporting software fuel gauging. Most importantly, the device combines all key power management functions to reduce board area by 25 percent compared to discrete regulators.
The Power Management IC (PMIC) comprises 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 I2C configurable compact WLCSP package.
Battery protection features are available to prevent the battery from overheating and over-discharge. The input is 22v tolerant and is immune to plug in of the wrong adapter. Dynamic power path management enables charging from multiple power sources, and automatically balances current delivered to the system and for charging the battery.
An integrated analog battery monitor facilitates on-demand battery voltage and discharge current monitoring to create a battery fuel gauge solution. A watchdog input monitors the processor and upon detecting a stall in the processor, it power cycles the buck converter to avoid an indefinite hang up in the system. Status outputs and I2C allow the host to step PMIC behavior and monitor its status.
As consumer demands continue to push design boundaries, system designers are faced with a complex challenge of extending battery life even further while adding new feature sets, all in a small form factor. Dialog’s first fully-integrated nanopower PMICs build on the company’s expertise in power management and IoT connectivity to arm engineers with a compact, powerful solution that solves these challenges while reducing overall form factor of the system for wearables, IoT devices, health monitoring medical devices, portable gaming systems, wireless headphones and more.
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