PRODUCT DATASHEET
AAT3688
BatteryManager
TM
General Description
The AAT3688 BatteryManager™ is a highly integrated
single cell lithium-ion/polymer battery charger IC
designed to operate with USB port inputs. It requires the
minimum number of external components.
The AAT3688 precisely regulates battery charge voltage
and current for 4.2V lithium-ion/polymer battery cells.
Depending on the USB port type, the AAT3688 charge
current can be programmed for two separate levels up
to 500mA. An optional Charge Reduction Loop is built in
to allow users to charge the battery with available cur-
rent from a USB port, while keeping the port voltage
regulated.
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 any one of
14 various status states to a microcontroller.
The AAT3688 is available in a Pb-free, thermally-enhanced,
space-saving 12-pin 3x3mm TDFN package and is rated
over the -40°C to +85°C temperature range.
USB Port Lithium-Ion/Polymer Battery Charger
Features
• USB Charger
▪
Programmable up to 500mA Max
• 4.0V to 5.5V Input Voltage Range
• High Level of Integration With Internal:
▪
Charging Device
▪
Reverse Blocking Diode
▪
Current Sensing
• Automatic Recharge Sequencing
• Charge Reduction Loop for USB Charging
• Battery Temperature Monitoring
• Full Battery Charge Auto Turn-Off
• Over-Voltage Protection
• Emergency Thermal Protection
• Power On Reset and Soft Start
• Serial Interface Status Reporting
• 12-Pin 3x3mm TDFN Package
Applications
•
•
•
•
•
•
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Bluetooth™ Headsets
Cellular Telephones
Digital Still Cameras
Hand-Held PCs
MP3 Players
Personal Data Assistants (PDAs)
Other Lithium-Ion/Polymer Battery-Powered Devices
Typical Application
Enable
USB Input
USB Hi/Lo Select
USB
USBSEL
USBH
R
SETH
R
SETL
USBL
BAT
TS
C2
10µF
EN
CHR
BATT+
AAT3688
GND
BATT-
DATA
STAT1
STAT2
TEMP
Battery Pack
Serial Data
3688.2007.12.1.6
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