ADI Primary Battery SoH Monitor LTC3337
In addition to the integrated Coulomb counter, battery voltage and
Provides a monitor for impedance and temperature measurement


On the 16th, Analog Devices (ADI) released the ' LTC3337 ', a nanopower primary (non-rechargeable) battery state of health (SoH) monitor equipped with a precision Coulomb counter. This product is designed to be placed in series with a primary battery by minimizing series voltage drop.

This patented infinite dynamic range Coulomb counter aggregates all accumulated battery discharge and stores it in an internal register accessible via the I2C interface. With a standby current consumption of only 100nA, it extends battery life.

The LTC3337 includes the ability to monitor SoH variables such as battery voltage, impedance, and temperature, and report them via I2C. To accept a wide range of primary battery inputs, pin-selectable peak input current limits are available at 5mA, 10mA, 15mA, 20mA, 25mA, 50mA, 75mA, and 100mA. The battery input voltage range is 1.8V to 5.5V.

This allows the IC to display a load profile so that it can deliver maximum capacity to the battery regardless of the actual load. This is a battery-friendly feature that extends battery life. The LTC3337 is ideal for remote applications or primary battery applications with intermittent power consumption, such as electronic door locks or glass breakage detectors. It can also be used in secondary battery applications.