AAT3681_08 Datasheet, PDF (1/15 Pages) Advanced Analogic Technologies – USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger

BatteryManager^TM
PRODUCT DATASHEET
AAT3681
USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
General Description
The AAT3681 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 7.5V. It requires just one external component.
The AAT3681 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 300mA.
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 AAT3681 is available in a Pb-free, thermally
enhanced, space-saving 8-pin 2.0x2.1mm SC70JW pack-
age and is specified for operation over the -40°C to
+85°C temperature range.
Features
• USB or AC Adapter System Power Charger
▪ Programmable from 15mA to 300mA
• 4.0V ~ 7.5V 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
Typical Application
Adapter/USB Input
Enable
R_SET
ADP
BAT
AAT3681
STAT
EN
ISET
GND
BATT+
C
BATT-
Battery
Pack
3681.2007.12.1.5
www.analogictech.com
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