Medical

Minimal voltage drop with SoH monitor

17th September 2021
Mick Elliott

The LTC3337 from Analog Devices is a nanopower primary (non-rechargeable) cell State-of-Health (SoH) monitor with precision coulomb counter, 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.

Quiescent current consumption is only 100nA, increasing battery run time.

The device integrates additional SoH variable 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.

This enables the IC to present the battery with a load profile which allows it to deliver its maximum capacity, independent of the actual load.

This is “battery friendly” and prolongs the lifetime of the cell.

The LTC3337 is ideal for primary cell applications that require only occasional power such as applications in remote locations, electronic door locks, or glass break detectors.

The device may also be used in rechargeable battery cell applications.

Key features are:

  • 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)

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