Datasheet LTC3337 (Analog Devices)

LTC3337 Primary Battery SOH Monitor with Precision Coulomb Counter
FEATURES DESCRIPTION
n
Battery Input Voltage Range: 1.8V to 5.5V
The LTC®3337 is a primary battery state of health (SOH) n
100nA Quiescent Current
monitor with a built-in precision coulomb counter. It is n
8 Primary Battery Peak Input Current Limits:
designed to be placed in series with a primary battery
5mA/10mA/15mA/20mA/25mA/50mA/75mA/100mA
with minimal associated series voltage drop. The pat- n
SOH Monitor for Primary Battery
ented infinite dynamic range coulomb counter tallies ALL n Integrated Coulomb Counter (Q) accumulated battery discharge and stores it in an internal n Additional Monitors for Battery Voltage (V), register accessible via an I2C interface. A discharge alarm Battery Impedance (Z), and Temperature (T) threshold based on this state of charge (SOC) is program- n
Primary Battery Current (BAT_IN) or Load Current
mable. When it is reached, an interrupt is generated at
(BAT_OUT) is Counted
the IRQ pin. Coulomb counter accuracy is constant down n
Integrated ±10mA Supercapacitor Balancer
to no load. n Programmable Coulomb Counter Prescaler for Wide The LTC3337 also integrates additional SOH monitoring Range of Battery Sizes which measures and reports via I2C: battery voltage, bat- n Programmable Discharge Alarm Threshold with tery impedance, and temperature. Interrupt Output n I2C Interface To accommodate a wide range of primary battery inputs, n Tiny 12-Lead 2mm × 2mm LFCSP the peak input current limit is pin selectable from 5mA to 100mA.
APPLICATIONS
Coulombs can be calculated for either the BAT_IN or BAT_OUT pin, determined by the AV n CC pin connection. Low Power Primary Battery Powered Systems (e.g., 1× LiSOCl2, 2–3× Alkaline) A BAL pin is provided for applications utilizing a stack of n Remote Industrial Sensors (e.g., Meters, Alarms) two supercapacitors (optional) at the output. n Asset Trackers The LTC3337 is offered in a 12-lead 2mm × 2mm n Electronic Door Locks LFCSP package. n Keep-Alive Supplies/Battery Backup n SmartMesh® Applications All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 9312815.
TYPICAL APPLICATION Total Coulomb Counter Error (100mA IPEAK Setting) PEAK
5 COUT = 100µF 4 3.6V BAT_IN BAT_OUT TO SYSTEM LOAD 3 + AV 100μF CC LiSOCl 2 2 LTC3337 6V DV 1 CC BAL 0 3 IPK[2:0] ERROR (%) –1 BATOUT_OK 2 –2 I2C IRQ GND –3 BAT_IN = 5.5V 3337 TA01a –4 BAT_IN = 3.6V BAT_IN = 2V –50.01 0.1 1 10 100 BAT_OUT LOAD CURRENT (mA) 3337 TA01b Rev. 0 Do D c o u c m u e m n e t n tFe F e e d e b d a b c a k c For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Timing Diagram Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Applications Related Parts