ACT3780 - Active-Semi

ACT3780
Product Brief, 05-Dec-12
ActivePathTM Battery Charger
FEATURES
GENERAL DESCRIPTION
• ActivePath
The ACT3780 is a complete battery-charging and
system power management solution for portable
hand-held equipment using single-cell Lithiumbased batteries. The ACT3780 incorporates ActiveSemi's proprietary ActivePath architecture which
automatically selects the best available input supply
for the system.
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TM
System Power Selection of Best
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
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 PowerTM
ActivePathTM is a trademark of Active-Semi.
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www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACT3780
Product Brief, 05-Dec-12
ORDERING INFORMATIONcd
PART NUMBER
BATTERY
VOLTAGE
SYSTEM
VOLTAGE
PACKAGE
PINS
TEMPERATURE
RANGE
ACT3780QY-T
4.2V
4.6V
TQFN44-20
20
-40°C to 85°C
ACT3780QY410-T
4.1V
4.6V
TQFN44-20
20
-40°C to 85°C
c: All Active-Semi components are RoHS Compliant and with Pb-free plating unless specified differently. The term Pb-free means
semiconductor products that are in compliance with current RoHS (Restriction of Hazardous Substances) standards.
d: Standard product options are identified in this table. Contact factory for custom options. Minimum order quantity is 12,000 units.
FUNCTIONAL BLOCK DIAGRAM
Body
Control
(Optional)
AC Adaptor
ACT3780
CHG_IN
SYS
System Supply
USB
Body
Control
BAT
ACIN
+
CURRENT SENSE
EN
VOLTAGE SENSE
PRECONDITION
REF
nBLV1
CHGLEV
VTHH
TH
nBLV2
+
–
+
–
VTHL
Thermal
Shutdown
nACOK
System and
Charger Control
ISET
nSTAT3
nSTAT2
DCCC
nSTAT1
BTR
THERMAL
REGULATION
EP
Innovative PowerTM
ActivePathTM is a trademark of Active-Semi.
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G
110°C
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.