• solar cell energy harvesting system manager
• ultra low power, 110nA
• low battery indicator
• precise power up/down
• battery overcharging protection

The MAS6011 solar cell system manager monitors the supply voltage and charging of a batterypowered system containing a small solar cell. The current consumption of this IC is extremely low, 110 nA, which means the system can charge from very low light conditions and also stay in power down mode for years and still operate directly from the battery before recharging.

To be able to charge a battery also in condition with very limited light, a large solar cell is usually used. This can on the other hand easily destroy the battery due to over voltage during strong sun light. MAS6011 solves this dilemma and will give secure protection of a secondary 3V battery over a big range of light strengths (lx). 

Three output signals indicate the state of the system. Power Down (XPD) indicates whether the supply voltage is high enough to power up and run the system. Low Battery (LB) is used to signal the condition when the battery capacity is low and when to move to power saving mode. The third signal, SOL, is used for battery charging control. When the battery is full it bypasses the charging current by an internal shunt switch to avoid overcharging. The SW pin can also be used to control an external shunt switch for higher currents.

Features:

• ultra low current consumption, typ 110nA
• low supply voltage operation, min 2.0V
• battery overcharging protection
• power on indicator and secure power ON after shut down
• deep discharge protection of battery during shut down mode
• precise shut down and precise low battery warning threshold levels
• suitable for rechargeable 3V lithium vanadium pentoxide (VL-type) batteries

Applications:

• solar powered watch
• solar powered wireless sensor 
• solar powered devices with back-up
• GPS modules
• time code receiver modules
• electronic locks
• energy harvesting