LTC3337ERC#TRMPBF

LTC3337 is a primary battery state of health (SOH) monitor with a built-in precision coulomb counter. It is designed to be placed in series with a primary battery with minimal associated series voltage drop. The patented infinite dynamic range coulomb counter tallies ALL accumulated battery discharge and stores it in an internal register accessible via an I²C interface. A discharge alarm threshold based on this state of charge (SOC) is programmable. When it is reached, an interrupt is generated at the IRQ pin. Coulomb counter accuracy is constant down to no load. It also integrates additional SOH monitoring which measures and reports via I²C: battery voltage, battery impedance, and temperature. It is widely used in application such as low power primary battery powered systems (e.g., 1× LiSOCl2, 2–3× alkaline), remote industrial sensors (e.g., meters, alarms), asset trackers, electronic door locks, keep-alive supplies/battery backup, SmartMesh® applications etc.

• Battery input voltage range is 1.8V to 5.5V
• Quiescent current is 100nA typical
• Integrated coulomb counter (Q), additional monitors for battery voltage (V)
• Battery impedance (Z), and temperature (T)
• Primary battery current (BAT-IN) or load current (BAT-OUT) is counted
• Integrated ±10mA supercapacitor balancer
• Programmable coulomb counter prescaler for wide range of battery sizes
• Programmable discharge alarm threshold with interrupt output
• Operating junction temperature is -40°C to 125°C
• Package style is 12-lead LFCSP

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