It is equipped with a coulomb counter and can be placed in series with a primary battery with minimal associated series voltage drop, says the company. The patented, infinite dynamic range coulomb counter tallies all accumulated battery discharge and stores it in an internal register accessible via an I²C interface. The integrated state-of-health variable monitoring measures battery voltage, battery impedance, and temperature.

To accommodate a wide range of primary battery inputs, the peak input current limit is pin selectable from 5mA to 100mA. This enables the IC to present the battery with a load profile which allows it to deliver its maximum capacity, independent of the load. This saves battery energy and prolongs the lifetime of the cell.

Quiescent current consumption is only 100nA, which contributes to increasing battery run time.

The LTC3337 is designed for primary cell applications that require only occasional power such as electronic door locks, or glass break detectors and applications in remote locations. The device may also be used in rechargeable battery cells.

Samples are available, together with evaluation boards. The LTC3337 is in production now and supplied in a 12-lead 2.0 x 2.0mm LFCSP.