AAT3686
USB Port/AC Adapter
Lithium-Ion/Polymer Battery Charger
3686.2006.06.1.5 1
BatteryManager
™
General Description
The AAT3686 BatteryManager is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. This device is a highly
integrated single-cell lithium-ion/polymer battery
charger IC designed to operate with USB port and
AC adapter inputs. It requires the minimum number
of external components.
The AAT3686 precisely regulates battery charge
voltage and current for 4.2V lithium-ion/polymer
battery cells. Adapter charge current rates can be
programmed up to 1.5A. In the absence of an
adapter and with a USB port connected, the battery
can also be charged by USB power. Depending on
the USB port type, the AAT3686 charge current can
be programmed for two separate levels up to
500mA. An optional Charge Reduction Loop is also
built in to allow users to charge the battery with
available current from a USB port, while keeping
the port voltage regulated. USB charging is dis-
abled when an adapter is present.
Battery temperature and charge state are fully moni-
tored for fault conditions. In the event of an over-volt-
age or over-temperature failure, the device will auto-
matically shut down, thus protecting the charging
device, control system, and the battery under charge.
Status monitor output pins are provided to indicate
the battery charge status by directly driving two exter-
nal LEDs. A serial interface output is available to
report 22 various status states to a microcontroller.
The AAT3686 is available in a Pb-free, thermally-
enhanced, space-saving 16-pin 4x4mm TDFN
package and is rated over the -40°C to +85°C tem-
perature range.
Features
• USB Port/AC Adapter System Power Charger
— USB: Programmable to 500mA for
USB Hi/Lo
— Adapter: Programmable to 1.5A Max
• 4.0V to 5.5V Input Voltage Range
• Adapter Present Indicator (ADPP# Pin)
• Adapter Presence Automatically Disables
USB Charging
• High Level of Integration With Internal:
— Charging Devices
— Reverse Blocking Diodes
— Current Sensing
• Automatic Recharge Sequencing
• Digital Thermal Regulation in ADP Charge
• Charge Reduction Loop in USB Charge
• Battery Temperature Monitoring
• Full Battery Charge Auto Turn-Off
• Over-Voltage and Emergency Thermal
Protection
• Power On Reset and Soft Start
• Serial Interface Status Reporting
• 16-Pin 4x4mm TDFN Package
Applications
• Cellular Telephones
• Digital Still Cameras
• Hand-Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
Typical Application
AAT3686
C2
10 µ F
BATT-
TEMP
USB Input
Battery Pack
Serial Data
USB
USBSEL
ADP
ADPSET
CT
GND
TS
BAT
BATT+
R SET
C T
USB Hi/Lo Select
ADP Present
ADP Input
STAT1
R SETH
USBH
R SETL
USBL
CHREN
STAT2
DATA
ADPP#
Enable