LTC3337

RECOMMENDED FOR NEW DESIGNS

Primary Battery SOH Monitor with Precision Coulomb Counter

Data Sheet (Rev. A) Product Selection Table

Part Models: 3
1ku List Price: Starting From $1.26

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Overview

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 AV_CC 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.

APPLICATIONS

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

Part Models: 3
1ku List Price: Starting From $1.26

Documentation

Data Sheet 1

LTC3337 - Primary Battery SOH Monitor with Precision Coulomb Counter Data Sheet (Rev.A) 05/04/2021

User Guide 1

DC2973A - Demo Manual (Rev.0) 06/24/2021

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3337ACBZ-R7	CHIPS W/SOLDER BUMPS/WLCSP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3337ERC#TRMPBF	12-Lead Plastic LFCSP (2mm × 2mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3337ERC#TRPBF	12-Lead Plastic LFCSP (2mm × 2mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Device Drivers 1

LTC3337 GitHub no-OS Driver Source Code

Can't find the software or driver you need?

Tools & Simulations

LTpowerPlay®

LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.

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Evaluation Kits

LTC3337 | Primary Battery SOH Monitor with Precision Coulomb Counter

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Product Details

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 I_PEAK 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.