General Description
The AAT3688 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
inputs. It requires the minimum number of external
components.
The AAT3688 precisely regulates battery charge
voltage and current for 4.2V lithium-ion/polymer bat-
tery 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 current from a USB
port, while keeping the port voltage regulated.
Battery temperature and charge state are fully
monitored for fault conditions. In the event of an
over-voltage or over-temperature failure, the
device will automatically shut down, thus protecting
the charging device, control system, and the bat-
tery 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 tem-
perature range.
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
• Bluetooth™ Headsets
• Cellular Telephones
• Digital Still Cameras
• Hand-Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
AAT3688
USB Port Lithium-Ion/Polymer Battery Charger
Typical Application
AAT3688
C2
10 µ F
BATT-
TEMP
USB Input
Battery Pack
Serial Data
USB
USBSEL
GND
TS
BAT
BATT+
USB Hi/Lo Select
STAT1
R SETH
USBH
R SETL
USBL
CHREN
STAT2
DATA
Enable
3688.2006.04.1.3 1
BatteryManager
™