The CN3083 is a complete constant-current /constant
voltage linear charger for single cell Li-ion and Li
Polymer rechargeable batteries. The device contains
an on-chip power MOSFET and eliminates the need
for the external sense resistor and blocking diode. An
on-chip 8-bit ADC can adjust charging current
automatically based on the output capability of input
power supply, so CN3083 is ideally suited for solar
powered system. Furthermore, the CN3083 is
specifically designed to work within USB power
specifications. Thermal feedback regulates the
charge current to limit the die temperature during
high power operation or high ambient temperature.
The regulation voltage is internally fixed at 4.2V
with 1% accuracy, it can also be adjusted with an
external resistor. The charge current can be
programmed externally with a single resistor. When
the input supply is removed, the CN3083
automatically enters a low power sleep mode ,
dropping the battery drain current to less than 3uA.
Other features include undervoltage lockout,
automatic recharge, battery temperature sensing and
The CN3083 is available in a thermally enhanced
8-pin SOP package.