ACT3780
Product Brief, 05-Dec-12
ActivePath
TM
Battery Charger
FEATURES
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ActivePath
TM
System Power Selection of Best
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Available Input Supply
50mΩ Battery Switch for Highest Efficiency
Dynamic Control of Charging Current Allowing
System to Draw Maximum Load from AC/USB
Input
±0.5% Battery Charge Voltage Accuracy
Up to 12V Input with Over Voltage Protection
Thermal Regulation for Charge Control
Charge Status Outputs for LED or System
Interface
Battery Voltage Level Indication
Programmable Fast Charge Current
Programmable Charging Timer
Low Reverse Leakage Current
Short-Circuit and Thermal Protection
Preconditioning for Deeply Depleted Battery
Low Quiescent Current Standby Mode
Space-Saving, Thermally-Enhanced
TQFN44-20 Packages
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.
APPLICATIONS
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Personal Navigation Devices
Smart Mobile Phones
Blue-Tooth Devices
Portable Media Players
Portable Devices
ActivePath
DIAGRAM
Innovative Power
TM
ActivePath
TM
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www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
is a trademark of Active-Semi.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
