AAT3681 Datasheet, PDF (1/15 Pages) Advanced Analogic Technologies – USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger

AAT3681
USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager^™
Features
The AAT3681 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 6.5V. It requires
just one external component.
The AAT3681 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 300mA.
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.
The AAT3681 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.
Typical Application
• USB or AC Adapter System Power Charger
— Programmable from 15mA to 300mA
• 4.0V ~ 6.5V Input Voltage Range
• High Level of Integration with Internal:
— Charging Device
— Reverse Blocking Diode
• Automatic Current Sensing
• Automatic Recharge Sequencing
• Full Battery Charge Auto Turn Off/Sleep
Mode/Charge Termination
• Shutdown Current <1µA
• Automatic Trickle Charge for Battery Pre-
Conditioning (AAT3681-1 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
Applications
• Bluetooth^® Headsets
• DECT Headsets
• Digital Still Cameras
• MP3, Portable Music, and Portable Media
Players
• Personal Data Assistants (PDAs)
• Wrist Watches
• Other Lithium-Ion/Polymer Battery-Powered
Devices
Adapter/USB Input
Enable
R_SET
ADP
BAT
AAT3681
STAT
EN
ISET
GND
BATT+
C
BATT-
Battery
Pack
3681.2007.01.1.2
1