Texas Instruments' bq25505 devices are specifically designed to efficiently extract the microwatts (µW) to miliwatts (mW) of power generated from a variety of DC energy harvesting, high-impedance sources without collapsing them. These sources include photovoltaic (solar) or thermal electric generators (TEGs). The battery-management features of the bq25505 ensure that a secondary rechargeable battery is not overcharged by this extracted power, with voltage boosted nor depleted beyond safe limits by a system load. The integrated multiplexer gate drivers autonomously switch the system load to a primary, non-rechargeable battery if the secondary battery voltage falls below the user-defined VBAT_OK threshold.
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- Ultra-low-power with high-efficiency DC-DC boost charger
- Cold-start voltage: VIN ≥ 330 mV
- Continuous energy harvesting from input sources as low as 100 mV
- Ultra-low quiescent current of 325 nA
- Input voltage regulation prevents collapsing high-impedance input sources
- Ship mode with < 5 nA from battery
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- Energy storage
- Energy can be stored to rechargeable Li-Ion batteries, thin-film batteries, super capacitors, or conventional capacitors
- Battery charging and protection
- Internally set undervoltage level
- User-programmable overvoltage level
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Texas Instruments' bq25505 devices are specifically designed to efficiently extract the microwatts (µW) to miliwatts (mW) of power generated from a variety of DC energy harvesting, high-impedance sources without collapsing them. These sources include photovoltaic (solar) or thermal electric generators (TEGs). The battery-management features of the bq25505 ensure that a secondary rechargeable battery is not overcharged by this extracted power, with voltage boosted nor depleted beyond safe limits by a system load. The integrated multiplexer gate drivers autonomously switch the system load to a primary, non-rechargeable battery if the secondary battery voltage falls below the user-defined VBAT_OK threshold.
