DATA SHEET
AAT3697
2A Li-Ion/Polymer Battery Charger
General Description
Features
The AAT3697 BatteryManager 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 AAT3697 precisely
regulates battery charge voltage and current for 4.2V
lithium-ion/polymer battery cells. Adapter charge current
rates can be programmed up to 2.0A. An active thermal
management system regulates the fast charge constant
current for all ambient temperature and input vs. output
voltage conditions.
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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 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 12 various
charging status states to a microcontroller.
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Input Voltage Range: 4.0V to 5.5V
Up to 2.0A 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-Current, and Over-Temperature
Protection
Power On Reset and Soft Start
Serial Interface Status Report
12-Pin 3x3mm TDFN Package
-40°C to +85°C Temperature Range
Applications
The AAT3697 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 temperature range.
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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
BATT+
Adapter
Present
ADPP#
Enable
EN
BAT
VADP
Serial Interface
COUT
10μF
RT1
DATA
+
BATT-
AAT3697
TS
CT
Adapter
ADP
ADPSET
CIN
10μF
STAT1
GND
CT
0.1μF
TEMP
STAT2
RSET
RT2
RB1
RB2
Battery
Pack
LED1
LED2
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201901B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
1
DATA SHEET
AAT3697
2A Li-Ion/Polymer Battery Charger
Pin Descriptions
Pin #
Name
Type
1
2
3
4
5
6
7
8
9
BAT
ADP
GND
EN
ADPP#
TS
DATA
STAT2
STAT1
Out
In
Ground
In
Out
In/Out
Out
Out
Out
10
CT
In/Out
11
12
EP
N/C
ADPSET
In/Out
Function
Battery charging and sensing.
Adapter input.
Ground connection.
Enable pin. Logic high enables the IC.
Adapter present indicator. This pin is open drain until ADP pin reaches threshold.
Battery temperature sense input.
Status report to microcontroller via serial interface; open drain.
Battery charge status indicator pin to drive an LED; active low, open drain.
Battery charge status indicator pin to drive an LED; active low, open drain.
Timing capacitor to adjust internal watchdog timer. Set maximum charge time for adapter powered
trickle, CC, and CV charge modes. If timing function is not needed, terminate this pin to ground.
No connection.
Use resistor at this pin to set adapter charging current.
Exposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
TDFN33-12
(Top View)
BAT
ADP
GND
EN
ADPP#
TS
2
1
12
2
11
3
10
4
9
5
8
6
7
ADPSET
N/C
CT
STAT1
STAT2
DATA
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201901B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
DATA SHEET
AAT3697
2A Li-Ion/Polymer Battery Charger
Absolute Maximum Ratings1
Symbol
VP
VP
VN
TJ
TLEAD
Description
ADP Input Voltage,
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