Lithium-Ion/Polymer Battery Charger
General Description
The AAT3687 BatteryManager is a highly integrat-
ed single-cell lithium-ion/polymer battery charger
IC designed to operate with AC adapter inputs. It
requires a minimum number of external compo-
nents. 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.
AAT3687
Features
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BatteryManager
™
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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
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Cellular Telephones
Digital Still Cameras
Hand Held PCs
MP3 Players
Personal Data Assistants (PDAs)
Other Lithium-Ion/Polymer Battery-Powered
Devices
Typical Application
Adapter
Present
Enable
Serial Interface
BATT+
ADPP#
EN
DATA
TS
BAT
C
OUT
10μF
+
BATT-
AAT3687
CT
Adapter
C
IN
10μF
R
SET
R
B1
LED1
R
B2
ADP
ADPSET
STAT1
GND
STAT2
C
T
0.1μF
TEMP
Battery
Pack
LED2
3687.2006.10.1.7
1
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
