DESCRIPTION
ETA4056 is a single cell, fully integrated constant current
(CC)/constant voltage (CV) Li-ion battery charger. Its
compact package with minimum external components
requirement makes the ETA4056 ideal for portable
applications. No external sense resistor or blocking diode is
necessary for the ETA4056. Build-in thermal feedback
mechanism regulates the charge current to control the die
temperature during high power operation or at elevated
ambient temperature. The ETA4056 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 1/10th of the
programmed value. The ETA4056 keeps monitoring the
battery voltage and enables a new charge cycle once the
voltage drops by 120mV below the CV value.
ETA4056 is in an ESOP8, DFN2x2-8, DFN2x3-8, and
SOT23-6 package.

FEATURES
 16V input standoff voltage
 4.2V charge termination voltage
 2.9V trickle charge threshold
 Charge current programmable, up to 1.2A
 250nA BAT current when no charging
 Soft-start limits in-rush current
 ESOP8 / DFN2x2-8 / DFN2x3-8 / SOT23-6

APPLICATIONS
 E-cigarette
 Toys
 Bluetooth applications
 Li-ion battery powered devices