Ultra Low Power Energy Harvesting Battery Boost Converter Design
TI's BQ25504 is a new integrated nano-energy energy harvesting power management solution that is ideal for ultra-low power applications with special needs. The product is specifically designed to efficiently acquire and manage microwatts and milliwatts of electricity, usually from a variety of photovoltaic solar DC sources or thermal motor generators. The BQ25504 is a highly efficient implementation of converters or chargers for products and systems, for example in applications where there is a stringent need for operational power consumption in radio sensor networks. The DC/DC boost converter/charger, designed with the BQ25504, requires only milliwatts of power to operate. BQ25504 main features The BQ25504 is an ultra low power, high efficiency DC/DC boost converter/charger. Continuously harvest energy from low input sources: VIN a‰¥ 80mV (typical) Ultra low quiescent current: IQ "330 nA (typical) Figure 1 BQ25504 block diagram Figure 2 BQ25504 design schematic Cold start voltage: VIN a‰¥ 330 mV (typical), programmable dynamic maximum power point tracking (MPPT) Integrated dynamic maximum power point tracking for extracting optimal energy (from various energy sources), input voltage regulation, preventing input source energy damage Energy can be stored in rechargeable lithium-ion batteries, thin-film batteries, supercapacitors, or traditional capacitor batteries, charging and protection User programmable undervoltage and overvoltage On-chip temperature sensor, programmable over-temperature shutdown battery status output Battery good output pin Programmable threshold and hysteresis Power loss microcontroller warning Load that can be used to enable/disable the system BQ25504 application Energy harvesting solar power charger Thermal Power Generator (TEG) acquisition Wireless Sensor Network (WSN) Industrial monitoring Environmental monitoring Bridge Structure Health Monitoring (SHM) Intelligent building control Portable and wearable medical devices Entertainment system remote control BQ25504 reference design main features Table 1 BQ25504 design plan material list Evaluation module of BQ25504 Ultra Low Power Boost Converter/Charger and Battery Management for Energy Harvesting Applications Undervoltage, overvoltage resistor programmable settings, flexible battery management, POTS including fine-tuning settings (not assembled on board) Programmable push-pull output indicator for battery status (VBAT_OK) Key signal test points for testing, easy to detect connections Jumpers are easy to change settings
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