ACTIVE-SEMI ACT3780 Activepathâ ¢ battery charger Datasheet

ACT3780
Active-Semi
Product Brief, 29-May-08
Advanced Information―All Information Subject to Change
ActivePathTM Battery Charger
FEATURES
GENERAL DESCRIPTION
• ActivePathTM System Power Selection of Best
The ACT3780 is a complete battery charging and
management solution for one cell Lithium-Ion or Lithium-Polymer battery. The ACT3780 incorporates the
ActivePath architecture which automatically selects
the best available input supply for the system.
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Available Input Supply
40mΩ Battery 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
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 external 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 available upon request).
The ACT3780 is available in an thermally enhanced
4mm x 4mm Thin-QFN and 3.5mm × 4.5mm ThinDFN 20-pin packages.
APPLICATIONS
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Personal Navigation Devices
Smart Mobile Phones
Blue-Tooth Devices
Portable Media Players
Portable Devices
SIMPLIFIED APPLICATION CIRCUIT
AC Adapter/USB
CHG_IN
SYS
Li-ion Battery
To SYSTEM
Pb
BAT
STAT1
+
ISET
Pb-free
STAT2
ACT3780
Path
TM
Active
Innovative PowerTM
ActivePathTM is a trademark of Active-Semi.
-1-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
ACT3780
Active-Semi
Product Brief, 29-May-08
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
ACT3780NY-T
4.2V
4.6V
TDFN3545-20
20
-40°C to 85°C
c: Battery and system voltage options detailed in this table represent standard voltage options, and are available for samples or production orders. Contact Active-Semi for more information regarding semi-custom output voltage combinations.
d: 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.
FUNCTIONAL BLOCK DIAGRAM
Active-Semi
Body
Control
ACT3780
CHG_IN
DC
SYS
+
–
Body
Control
BAT
CHGLEV
+
EN
CURRENT SENSE
ACIN
VOLTAGE SENSE
REF
BLV1
TH
ISET
BLV2
System and
Charger Control
nACOK
STAT3
DCCC
STAT2
BTR
STAT1
THERMAL
REGULATION
Innovative PowerTM
-2-
GA
110°C
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
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