DESCRIPTION

ETA9741 is a switching Li-Ion battery charger capable of

delivering 2A of charging current to the battery and also capable

of delivering up to 5V/2.4A in boost operation, with high efficiency

in both charging mode and boost mode. It also includes a fuel

gauge system for power indication. For charging, it uses a

proprietary control scheme that eliminates the current sense

resistor for conventional constant current control, maximizing

efficiency, reducing charging time and reducing costs. It can also

output a 5V voltage in the reversed direction by boosting from the

battery. It only needs a single inductor to provide power bidirectionally with a proprietary automatic mode detect and

switch scheme. ETA9741 is an ideal all-in-one solution for battery

charging and discharge applications, such as power banks, smart

phones, and tablets with only one USB port that can be used for

charging battery function.

ETA9741 is suitable for charging a 4.2V Li-ion battery. And ETA9741

is inESOP8 package.

FEATURES

Bi-Directional Power conversion with Single

Inductor

Automatic Mode Switching

Switching Charger

5V Synchronous Boost

Up to 96% Efficiency

2A charging current and 2.4A discharging

No-Battery detection

No External Sense resistor

4 LEDs Fuel gauge

Button Controlled

APPLICATIONS

Tablet, MID

Smart Phone

Power Bank