BQ25504EVM-674(#1): EH Low Power Boost Charger

The bq25504 is the first of a new family of intelligent integrated energy harvesting Nano-Power management solutions that are well suited for meeting the special needs of ultra-low power applications. The product is specifically designed to efficiently acquire and manage the microwatts (µW) to miliwatts (mW) of power generated from a variety of DC sources like photovoltaic (solar) or thermal electric generators.

The bq25504 is the first device of its kind to implement a highly efficient boost converter / charger targeted toward products and systems, such as wireless sensor networks (WSN) which have stringent power and operational demands. The design of the bq25504 starts with a DC-DC boost converter/charger that requires only microwatts of power to begin operating.

This EVM is programmed from the factory for settings compatible with most MCU’s and 3V coin cell batteries. The EVM is programmed to deliver a 3.1VDC maximum voltage (OV) for charging the storage element and the under voltage is programmed to 2.2VDC. The VBAT_OK indication toggles high when VSTOR ramps up at 2.8VDC and when VSTOR ramps down to 2.4VDC. The user’s guide describes the bq25504 evaluation module (EVM), how to perform a stand-alone evaluation and allows the EVM to interface with the system and host.

• Resistor-programmable settings for under voltage, over voltage for flexible battery management Including POTs for fine tuning the settings (not populated)
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• Programmable push-pull output Indication for battery status (VBAT_OK)
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• Test Points for Key Signals Available for Testing Purpose – Easy Probe Hook-up
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• Jumpers Available – Easy to Change Settings