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Copyright © 2013 Active-Semi, Inc.

Active-Semi Proprietary―For Authorized Recipients and Customers

ActivePath

ACT3780

Rev 8, 09-Jul-13

ActivePath

ActivePath

DIAGRAM

FEATURES

Available Input Supply

System to Draw Maximum Load from AC/USB

Input

Interface

TQFN44-20 Packages

APPLICATIONS

GENERAL DESCRIPTION

The ACT3780 is a complete battery-charging and

system power management solution for portable

hand-held equipment using single-cell Lithium-

based batteries. The ACT3780 incorporates Active-

Semi's proprietary ActivePath architecture which

automatically selects the best available input supply

for the system.

The

ActivePath

architecture

performs

three

important functions: First, the battery is charged

while powering with the system, minimizing current

draw from the battery while ensuring that sufficient

current is available to power the system. Second, if

no input supply is available, system power is

automatically switched to the battery. And finally, if

the system load-requirement exceeds the capability

of the input supply, ActivePath automatically

supplements the input with the battery to satisfy the

system's power requirements.

In addition to ActivePath, the ACT3780 charger

features a complete, high-accuracy (±0.5%),

thermally regulated, stand-alone single cell linear

Li+ charger with an integrated 12V power

MOSFET. The ACT3780 is available in a thermally

enhanced 4mm × 4mm Thin-QFN44-20.