LTC3337
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3337

Primary Battery SOH Monitor with Precision Coulomb Counter

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 3
1ku List Price Starting From $1.26
Features
  • 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
Additional Details
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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.

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

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Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3337ACBZ-R7
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LTC3337ERC#TRMPBF
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LTC3337ERC#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2973A

LTC3337 | Primary Battery SOH Monitor with Precision Coulomb Counter

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DC2973A

LTC3337 | Primary Battery SOH Monitor with Precision Coulomb Counter

LTC3337 | Primary Battery SOH Monitor with Precision Coulomb Counter

Product Detail

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.

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