AAT3681A
500mA USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
™
BatteryManager
General Description
Features
The AAT3681A BatteryManager is an integrated sin-
gle cell lithium-ion/polymer battery charger IC,
designed to operate from a DC power source or
USB port up to an input voltage of 7.5V. It requires
just one external component.
•
USB or AC Adapter System Power Charger
— Programmable from 15mA to 500mA
4.0V ~ 7.5V Input Voltage Range
High Level of Integration with Internal:
— Charging Device
•
•
— Reverse Blocking Diode
Automatic Current Sensing
The AAT3681A precisely regulates battery charge
voltage and current for 4.2V (4.375V option) lithium-
ion/polymer battery cells. When charged from an
AC adapter or USB port, the battery charging cur-
rent can be set by an external resistor up to 500mA.
•
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Automatic Recharge Sequencing
Full Battery Charge Auto Turn Off/Sleep
Mode/Charge Termination
•
•
Shutdown Current <1µA
Battery charge state is continuously monitored for
fault conditions. In the event of an over-voltage,
short-circuit, or over-temperature failure, the
device will automatically shut down, thus protecting
the charging device, control system, and the bat-
tery under charge. A status monitor output pin is
provided to indicate the battery charge status by
directly driving an external LED.
Automatic Trickle Charge for Battery Pre-
Conditioning (AAT3681A-1 is No Trickle
Charge Option)
•
Over-Voltage and Emergency Thermal
Protection
Power On Reset and Soft Start
LED Status Pin
8-Pin 2.0x2.1mm SC70JW Package
•
•
•
The AAT3681A is available in a Pb-free, thermally
enhanced, space-saving 8-pin 2.0x2.1mm SC70JW
package and is specified for operation over the
-40°C to +85°C temperature range.
Applications
®
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Bluetooth Headsets
DECT Headsets
Digital Still Cameras
MP3, Portable Music, and Portable Media
Players
•
•
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Personal Data Assistants (PDAs)
Wrist Watches
Other Lithium-Ion/Polymer Battery-Powered
Devices
Typical Application
Adapter/USB Input
ADP
BATT+
BAT
C
AAT3681A
BATT-
Battery
Pack
STAT
EN
Enable
ISET
GND
RSET
3681A.2007.10.1.2
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