PRODUCT DATASHEET
AAT3684
BatteryManager
TM
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
Features
• USB or AC Adapter System Power Charger
▪
Programmable from 15mA to 500mA
• 4.0V ~ 6.5V Input Voltage Range
• High Level of Integration with Internal:
▪
Charging Device
▪
Reverse Blocking Diode
General Description
The AAT3684 BatteryManager is an integrated single cell
lithium-ion/polymer battery charger IC, designed to oper-
ate from a DC power source or USB port up to an input
voltage of 6.5V. It requires just one external component.
The AAT3684 precisely regulates battery charge voltage
and current for 4.2V (4.375V option) lithium-ion/poly-
mer battery cells. When charged from an AC adapter or
USB port, the battery charging current can be set by an
external resistor up to 500mA.
Battery charge state is continuously monitored for fault
conditions. In the event of an over-voltage, short-cir-
cuit, or over-temperature failure, the device will auto-
matically shut down, thus protecting the charging device,
control system, and the battery under charge. A status
monitor output pin is provided to indicate the battery
charge status by directly driving an external LED.
The AAT3684 is available in a Pb-free, thermally
enhanced, space-saving 10-pin 2.2x2.2mm STDFN pack-
age and is specified for operation over the -40°C to
+85°C temperature range.
• 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
(AAT3684-1 is No Trickle Charge Option)
• Over-Voltage and Emergency Thermal Protection
• Power On Reset and Soft Start
• LED Status Pin
• STDFN2.2x2.2-10 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
Typical Application
Adapter/USB Input
ADP
BAT
C
BATT+
AAT3684
Enable
STAT
EN
ISET
GND
BATT-
Battery
Pack
R
SET
3684.2007.12.1.2
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