The ADP5090 is an integrated boost regulator that converts dc power from PV cells or thermoelectric generators (TEGs).The device charges storage elements such as batteries and capacitors, and powers up small electronic devices and battery-free systems.
The ADP5090 provides efficient conversion of the harvested limited power-down to a 10μW to 1mW range with sub-μW operation losses. With the internal cold-start circuit, the regulator is able to start operating at input voltage as low as 380 mV. Once started, the regulator is functional in the input voltage range from 100 mV to 3 V.
By sensing the voltage at the input pin, the control loop keeps the VIN voltage ripple in fixed range to maintain stable dc-todc conversion. In addition, VIN open circuit voltage (OCV) sensing and programmable regulation points of the input voltage allow extraction of the highest possible energy from the PV cell or TEG harvester. A programmable minimum OCV threshold down to 100 mV enables boost shutdown during low light conditions.
The charging control function of ADP5090 includes rechargeable energy storage protection and is achieved by monitoring the battery voltage with programmable charging termination voltage and shutdown discharging voltage. An optional primary cell battery can be connected and managed by an integrated power path management control block that automatically switches the power source from energy harvester, rechargeable battery, or primary cell battery.
The ADP5090 is available in a 16-lead LFCSP or TSSOP-16-EP package and is rated for a −40°C to +125°C junction temperature range.