Features and Benefits
- Battery Input Voltage Range: 1.8V to 5.5V
- 100nA Quiescent Current
- 8 Primary Battery Peak Input Current Limits: 5mA/10mA/15mA/20mA/25mA/50mA/75mA/100mA
- SOH Monitor for Primary Battery
- Integrated Coulomb Counter (Q)
- Additional Monitors for Battery Voltage (V), Battery Impedance (Z), and Temperature (T)
- Primary Battery Current (BAT_IN) or Load Current (BAT_OUT) is Counted
- Integrated ±10mA Supercapacitor Balancer
- Programmable Coulomb Counter Prescaler for Wide Range of Battery Sizes
- Programmable Discharge Alarm Threshold with Interrupt Output
- I2C Interface
- Tiny 12-Lead 2mm × 2mm LFCSP and 16-Ball 1.64mm × 1.64mm WLCSP Packages
The LTC3337 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 the IRQ pin. Coulomb counter accuracy is constant down to no load.
The LTC3337 also integrates additional SOH monitoring which measures and reports via I2C: 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.
Coulombs can be calculated for either the BAT_IN or BAT_OUT pin, determined by the AVCC pin connection.
A BAL pin is provided for applications utilizing a stack of two supercapacitors (optional) at the output.
The LTC3337 is offered in both 12-lead 2mm × 2mm LFCSP and 16-ball 1.64mm × 1.64mm WLCSP packages.
- Low Power Primary Battery Powered Systems (e.g., 1× LiSOCl2, 2–3× Alkaline)
- Remote Industrial Sensors (e.g., Meters, Alarms)
- Asset Trackers
- Electronic Door Locks
- Keep-Alive Supplies/Battery Backup
- SmartMesh® Applications
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Demonstration circuit 2973A shows the LTC3337 Primary Battery State of Health (SOH) monitor with precision coulomb counter operating with a configurable peak current limit. The LTC3337 supports input voltages from 1.8V to 5.5V and a peak current up to 100mA with a quiescent current of 100nA. Coulomb count, battery voltage, and Battery Series Resistance (BSR) are measurable and can be used to quantify the charge state and health of a battery.
The DC2973A demonstrates a simple layout for the highest-power configuration of the LTC3337. The circuit can be reduced for lower IPEAK levels. The demo board can be connected directly to a PC using a micro USB cable in order to run a GUI and configure simple a Battery State of Charge (SOC) monitor. Source code for the GUI is available and can be used as a starting point for LTC3337 firmware development.
3rd Party Solutions (1)
Technical Articles (1)
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.