Nanopower primary cell monitors battery health
Designed to be placed in series with a primary battery with minimal associated series voltage drop, the LTC3337 is a nanopower primary (non-rechargeable) cell state of health (SoH) monitor with precision coulomb counter, by Analog Devices.
The patented infinite dynamic range coulomb counter monitors and tallies all accumulated battery discharge (battery voltage, battery impedance and temperature) and stores this data in an internal register which is accessible via an I2C interface. The quiescent current consumption is only 100nA, increasing battery run time.
To accommodate a wide range of primary battery inputs, the peak input current limit is pin selectable from 5.0 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 actual load. This “battery friendly” operation prolongs the lifetime of the cell.
The LTC3337 has eight primary battery peak input current limits, i.e. 5.0, 10, 15, 20, 25, 50, 75 and 100mA. It is intended for use in primary cell applications that require only occasional power such as applications in remote locations, electronic door locks, or glass break detectors. The monitor may also be used in rechargeable battery cell applications.
The 12-lead 2.0 x 2.0mm LFCSP device is available for sampling and is in full production now.
Analog Devices has a suite of analogue and mixed signal, power management, radio frequency (RF), and digital and sensor technologies, serving customers worldwide operating in the industrial, communications, automotive and consumer markets.