SS4036G Datasheet, PDF (1/9 Pages) Silicon Standard Corp. – Two-Cell Li-Ion and Li-Polymer Charge Management IC

SS4036G
Two-Cell Li-Ion and Li-Polymer Charge Management IC
PRODUCT SUMMARY
Charge management for two-cell Li-Ion or Li-Polymer battery packs
Individual cell monitoring - avoids over-charging
TSSOP-8 small industry-standard package
FEATURES
Optional external thermistor monitors the pack temperature
Conditioning charge for reviving deeply discharged cells
Timer function available to limit the charging time
Pb-free, RoHS compliant.
DESCRIPTION
The SS4036G is a charging control IC designed
for battery packs with two cells in series. When
multiple cells in a battery pack are connected in
series, the weakest cell determines the overall
pack capacity. The SS4036G monitors the voltage
of each cell toensure that no cell is overcharged.
The pulse width modulation (PWM) output can be
used as either a linear or switching charge-control
circuit.
The small 8-pin TSSOP package is ideal for compact
battery packs used for portable applications.
The SS4036G continuously monitors each cell
voltage, cell current and the battery temperature.
Any unspecified condition will stop the charging to
to protect the battery cells. An external negative-
temperature-coefficient thermistor is used as a
sensor to monitor the battery pack temperature.
To be safe, charging is suspended if the voltage
of the temperature sense input pin is higher than
Min Temp Threshold (VTmin) or lower than
Max Temp Threshold (VTmax). When the battery
temperature is within the safe zone, the
SS4036G charges the battery in three phases:
pre-charging, constant-current, or constant-
voltage. If the battery voltage is less than 3.1V,
the SS4036G pre-charges the battery with a low
current. After the pre-charging, the SS4036G
applies a constant current to the battery. The
value of this constant current is determined by
the value of the current sense resistor. When
the battery voltage is above the threshold, the
SS4036G begins constant-voltage charging until
the battery is fully charged. The battery is fully
charged when the current drops down to the
termination threshold.
1/09/2006 Rev.3.01
www.SiliconStandard.com
1 of 9