Linear Technology Magazine December 2009 Articles on LTC4099 and LTC2262

About this manual

The first article, titled 'Battery Conditioner Extends the Life of Li-Ion Batteries' by George H. Barbehenn, describes the LTC4099 chip. It explains how an I²C controlled battery conditioner within the chip maximizes battery operating life by preventing aging caused by high voltage and temperature conditions. The text details the underlying aging process in Lithium-ion batteries and illustrates the LTC4099's discharge curve when protecting a battery above 60°C.

What's inside

• Introduction
• Underlying Aging Process
• Conditions Affecting Aging
• Battery Conditioner Function
• LTC2262 ADC Features

Frequently asked questions

At what temperature does the LTC4099 begin to discharge a battery?

The device gently discharges the battery when it detects that the battery temperature is higher than approximately 60°C.

What voltage level stops the LTC4099's discharge current?

The discharge current reaches zero when the battery terminal voltage is approximately 3.85V.

At what temperature should Li-Ion batteries be stored to minimize aging?

Battery manufacturers typically recommend storing batteries at 15°C (59°F) and a 40% state of charge.