Linear Li-Ion Battery Charger
EXT9502
Typical Performance Characteristics
Function Description
When the input voltage VDD is below the UVLO level, the chip will enter into the SLEEP MODE, the chip power
consumption will down to 20μA; When the VDD pin voltage rises above the UVLO voltage or more, the chip will
into the CHRG the MODE, a charge cycle begins, early in the charge cycle, if the battery voltage is lower than the
trickle charge threshold voltage (6.5V) the charger goes into trickle charge mode. The trickle charge current is
internally set to 20% of the maximum charging current. When the battery voltage exceeds the trickle charge
threshold, the charger enters constant current charging mode, the charging current from the internal 100mv
baseline and the external sense resistor to a decision.
The chip also with battery temperature detection function, this function through the VT side, and in VT
termination of a negative temperature coefficient 10KΩ thermistor (DALE NTHS1206N02), as the
temperature rises to 80 degrees, the pin voltage is 50mV for low temperature to reach -30 degrees, the point
voltage of 2V, only there voltage in the range of the two voltage values, the chip in order to work properly,
otherwise the charge is stopped, the LED is not lit, this pin can be directly connected to shield of the temperature
detection. Charging status display in the table below:
High current
charging
Fully
charged
NTC is not in the
scope of state
No-load
Trickle charge
Done
（
Green
）
）
Flicker
Off
Off
On
Off
On
On
Off
Off
Off
Charge
（
Red
E-CMOS Corp. (www.ecmos.com.tw)
8B07N-Rev. F001
5/6
