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AAT3685 Datasheet Preview

AAT3685 Datasheet

Lithium-Ion/Polymer Battery Charger

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AAT3685
Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager
Features
The AAT3685 BatteryManager™ is a highly inte-
• Adapter or USB Charger
grated single cell lithium-ion/polymer battery charg-
— Programmable up to 1A Max
er IC designed to operate with USB port or line
• 4.0V to 5.5V Input Voltage Range
adapter inputs. It requires the minimum number of
• High Level of Integration With Internal:
external components.
— Charging Device
The AAT3685 precisely regulates battery charge volt-
age and current for 4.2V lithium-ion/polymer battery
cells. Regardless of the type of input power source
(USB or adapter), the AAT3685 can be programmed
for two separate constant current charge levels up to
1A. An optional Charge Reduction Loop is built in to
allow users to charge the battery with available cur-
rent from the charge supply, while keeping the port
voltage regulated.
Battery temperature and charge state are fully
monitored for fault conditions. In the event of an
— Reverse Blocking Diode
— Current Sensing
• Automatic Recharge Sequencing
• Charge Reduction Loop
• 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
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
Applications
provided to indicate the battery charge status by
directly driving two external LEDs. A serial interfacewww.DataSheet4U.com• Cellular Telephones
output is available to report any one of 14 various
• Digital Still Cameras
status states to a microcontroller.
• Hand-Held PCs
The AAT3685 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.
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
Typical Application
Enable
Adapter or USB Input
Input Hi/Lo Select
RSETH
ADP/USB EN CHR
PWRSEL
SETH
BAT
SETL
TS
RSETL AAT3685
GND
BATT+
C2
10μF
BATT-
STAT1
DATA
STAT2
TEMP
Battery Pack
Serial Data
3685.2006.10.1.3
1




AAT

AAT3685 Datasheet Preview

AAT3685 Datasheet

Lithium-Ion/Polymer Battery Charger

No Preview Available !

AAT3685
Lithium-Ion/Polymer Battery Charger
Pin Descriptions
Pin #
1
2
3
4
Name
ADP/USB
BAT
GND
CHR
Type
In
In/Out
Ground
In/Out
5 EN
In
6 TS In/Out
7
DATA
In/Out
8 STAT2 Out
9 STAT1 Out
10 PWRSEL
In
11
SETL
In/Out
12
SETH
In/Out
EP
Function
Line adapter or USB power supply input.
Battery charging and sensing.
Ground connection.
Resistor divider to set USB voltage regulation for charge reduction mode.
Leave this pin open for default 4.5V USB regulation point. Tie to ADP/USB
pin to disable this function.
Enable pin. Logic high enables the IC.
Connect to 10kΩ NTC thermistor.
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.
When ADP/USB is present, use this pin to toggle between SETH and SETL
charging levels.
Connect resistor here to set charge current for low-current port.
Connect resistor here to set charge current for high-current port.
Exposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
TDFN33-12
(Top View)
ADP/USB 1
BAT 2
GND 3
CHR 4
EN 5
TS 6
12 SETH
11 SETL
10 PWRSEL
9 STAT1
8 STAT2
7 DATA
2 3685.2006.10.1.3



Part Number AAT3685
Description Lithium-Ion/Polymer Battery Charger
Maker AAT
Total Page 23 Pages
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AAT3685 Datasheet PDF





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