ETA4054

www.etasolution.com

1

Powering Minds of the Smart

16V/1A Fully Integrated Linear Charger for 1 Cell Li-ion Battery

DESCRIPTION

FEATURES

ETA4054 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 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 1/10th of

the programmed value. The ETA4054 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.



16V standoff input voltage at VIN and BAT pins



4.2V charge termination voltage



Charge current programmable, up to 1A



No damage when battery reversely connected



25uA supply current when standby



Soft-start limits in-rush current



SOT23-5 Package

APPLICATIONS



Toys



Bluetooth applications



Li-ion battery powered devices

ORDERING INFORMATION

PART

PACKAGE PIN

TOP MARK

ETA4054S2F SOT23-5

B1YW

TYPICAL APPLICATION

4

VIN

GND

ETA4054

1

2

STAT

3

BAT

5

ISET

VIN

4.7uF

RISET

Li+

Battery

1K

1uF