LTC3337

LTC3337 Primary Battery SOH Monitor with Precision Coulomb Counter FEATURES n Battery Input Voltage Range: 1.8V to 5.5V n 100nA Quiescent Current n 8 Primary Battery Peak Input Current Limits: 5mA/10mA/15mA/20mA/25mA/50mA/75mA/100mA n SOH Monitor for Primary Battery n Integrated Coulomb Counter (Q) n Additional Monitors for Battery Voltage (V), Battery Impedance (Z), and Temperature (T) n Primary Battery Current (BAT_IN) or Load Current (BAT_OUT) is Counted n Integrated ±10mA Supercapacitor Balancer n Programmable Coulomb Counter Prescaler for Wide Range of Battery Sizes n Programmable Discharge Alarm Threshold with Interrupt Output n I2C Interface n Tiny 12-Lead 2mm × 2mm LFCSP and 16-Ball 1.64mm × 1.64mm WLCSP Packages APPLICATIONS n Low Power Primary Battery Powered Systems (e.g., 1× LiSOCl2, 2–3× Alkaline) n Remote Industrial Sensors (e.g., Meters, Alarms) n Asset Trackers n Electronic Door Locks n Keep-Alive Supplies/Battery Backup n SmartMesh® Applications DESCRIPTION The LTC®3337 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 t...