General Description
The AAT3687 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 AC adapter
inputs. It requires a minimum number of external
components. The AAT3687 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. An active
thermal management system regulates the fast
charge constant current for all ambient tempera-
ture and input vs. output voltage conditions.
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 12 various charging
status states to a microcontroller.
The AAT3687 is available in a Pb-free, thermally-
enhanced, space-saving 12-pin TDFN 3x3mm
package and is rated over the -40°C to +85°C tem-
perature range.
Features
• Input Voltage Range: 4.0V to 5.5V
• Up to 1.5A Charging Current
• Adapter Present Indicator (ADPP#)
• High Level of Integration with Internal:
— Charging Device
— Reverse Blocking Diode
— Current Sensing
• Active Thermal Loop Charge Reduction
• Automatic Recharge Sequencing
• Battery Temperature Monitoring
• Full Battery Charge Auto Turn-Off / Sleep Mode
• Over-Voltage, Over-Temperature, and
Emergency Thermal Protection
• Power On Reset and Soft Start
• Serial Interface Status Report
• 12-Pin 3x3mm TDFN Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Telephones
• Digital Still Cameras
• Hand Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
AAT3687
Lithium-Ion/Polymer Battery Charger
Typical Application
AAT3687
C
OUT
10 µ F
BATT-
TEMP
Battery
Pack
ADP
ADPSET
CT
GND
TS
BAT
BATT+
R
SET
R
B1
R
B2
C
IN
10 µ F
C
T
0.1 µ F
A dapter
STAT1
LED1
LED2
STAT2
DATA
Serial Interface
ENEnable
ADPP#
Adapter
Present
+
3687.2006.06.1.5 1
BatteryManager
™