PRODUCT DATASHEET
AAT3686
BatteryManager
TM
General Description
The AAT3686 BatteryManager is a highly integrated sin-
gle-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 regulat-
ed. USB charging is disabled 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 external 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擄C to +85擄C temperature range.
USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger
Features
鈥?USB Port/AC Adapter System Power Charger
鈻?/div>
USB: Programmable to 500mA for USB Hi/Lo