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ACT3780 Schematic ( PDF Datasheet ) - Active-Semi

Teilenummer ACT3780
Beschreibung Battery Charger
Hersteller Active-Semi
Logo Active-Semi Logo 




Gesamt 2 Seiten
ACT3780 Datasheet, Funktion
Active-Semi
ACT3780
Product Brief, 29-May-08
Advanced InformationAll Information Subject to Change
ActivePathTM Battery Charger
FEATURES
ActivePathTM System Power Selection of Best
Available Input Supply
40mBattery Switch for Highest Efficiency
Dynamic Control of Charging Current Allowing
System to Draw Maximum Load from AC/USB
Input
±0.5% Battery Voltage Accuracy
Up to 12V Input
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
or TDFN3545-20 Packages
APPLICATIONS
Personal Navigation Devices
www.DataShSemet4aUrt.cMomobile Phones
Blue-Tooth Devices
Portable Media Players
Portable Devices
GENERAL DESCRIPTION
The ACT3780 is a complete battery charging and
management solution for one cell Lithium-Ion or Lith-
ium-Polymer battery. The ACT3780 incorporates the
ActivePath architecture which automatically selects
the best available input supply for the system.
When an external power source such as an AC
adapter or a USB port is connected in, the ACT3780
regulates the system voltage to 4.8V in addition to
providing charging current to the battery. If the exter-
nal input source is not present or the system load
current is more than the input source can provide,
the ActivePath supplies additional current from the
battery to the system.
The ACT3780 charger is a complete, thermally
regulated, stand-alone single cell linear Li+ charger
that integrates an internal power 12V MOSFET. The
battery regulation voltage is ±0.5% accurate, and is
factory programmed from 4.2V (other voltages avail-
able upon request).
The ACT3780 is available in an thermally enhanced
4mm x 4mm Thin-QFN and 3.5mm × 4.5mm Thin-
DFN 20-pin packages.
SIMPLIFIED APPLICATION CIRCUIT
AC Adapter/USB
Li-ion Battery
+
CHG_IN
SYS To SYSTEM
BAT
STAT1
ISET
STAT2
ACT3780
PathActive
TM
Pb
Pb-free
Innovative PowerTM
ActivePathTM is a trademark of Active-Semi.
-1-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.





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