AAT3686 Datasheet, PDF (1/24 Pages) Advanced Analogic Technologies – USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger

AAT3686
USB Port/AC Adapter
Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager^™
Features
The AAT3686 BatteryManager 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 TDFN34-16 (3x4mm) or
TDFN44-16 (4x4mm) package and is rated over the
-40°C to +85°C temperature range.
Typical Application
• 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
• TDFN34-16 or TDFN44-16 Package
Applications
• Cellular Telephones
• Digital Still Cameras
• Hand-Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
Enable
USB Input
USB Hi/Lo Select
USB EN
USBSEL
USBH
CHR
BAT
RSETH
USBL
TS
RSETL
AAT3686 _CT
CT
ADP Present
ADP Input
ADPP#
ADP
ADPSET
RSET _STAT1
GND
DATA
STAT2
BATT+
C2
10μF
BATT-
TEMP
Battery Pack
Serial Data
3686.2006.10.1.9
1