MIC79110 Micrel Semiconductor, MIC79110 Datasheet - Page 9

• Manufacturer Part Number: MIC79110
• Description: Simple 1.2A Linear Li-Ion Battery Charger
• Manufacturer: Micrel Semiconductor

capacity. An increase in the charge current during stage 1
does not shorten the total charge time. It will only shorten the
time for stage 1 to complete and lengthen the time in stage 2.
The lithium-ion loses charge due to aging whether it is used
or not. Do not store the batteries at full charge and high heat
because it will accelerate the aging process. Try and store
with 40% charge and in a cool environment.
Lithium-Ion Safety Precautions
Every lithium ion battery pack should have a safety board
which monitors the charge and discharge of the pack and
prevents dangerous occurrences. The specifications of these
safety boards are dictated by the cell manufacturer and may
include the following:
July 2004
MIC79110
• Reverse polarity protection
• Charge temperature must not be charged when
temperature is lower than 0°C or above 45°C.
Deoc Flag is High
Current Limit
End of Charge
Stop Charge
Stop Charge
Stop Charge
Standby Mode
Do not charge
>125C
Irset
>4.3V
1
Start Charging
Lithium-Ion
Monitor Ibat
Shutdown
Charging
Battery
<Ieoc
<Ieoc
Ibat
Pin
0
9
• Charge current must not be too high, typically
• Discharge current protection to prevent damage
• Protection circuitry for over voltage applied to the
• Overcharge protection circuitry to stop charge
• Over discharge protection circuitry to stop dis-
• Thermal shutdown protection for the battery if the
below 0.7C
due to short circuits.
battery terminals.
when the voltage per cell rises above 4.3V.
charge when the battery voltage falls below 2.3V
(varies with manufacturer).
ambient temperature is above 100°C.
Deoc Flag is Low
Continue Charge
Ieoc<Ibat<Irset
Battery Voltage
Temperature
Charging
Battery
Die
<125C
<4.3V
M9999-072004
Micrel