DESCRIPTION
ETA4054 is a single cell, fully integrated constant current
(CC)/constant voltage (CV) ion battery charger. Its
compact package with minimum external components
requirement makes the ETA4054 ideal for portable
applications. No external sense resistor or blocking diode is
necessary for the ETA4054. Build-in thermal feedback
mechanism regulates the charge current to control the die
temperature during high power operation or at elevated
ambient temperature. The ETA4054 has a pre-charge
function for trickle charging deeply discharged batteries.
The fast charge current can be programmed by an external
resistor. CV regulation mode is automatically enabled once
the battery's charging curve reaches the constant voltage
portion. The output current then decays and is finally
terminated once the charge current drops to l/l0th of the
programmed value. The E TA4054 keeps monitoring the
battery voltage and enables a new charge cycle once the
voltage drops by 150mV below the CV value.
ETA4054 is in a tiny SOT23-5 package.
