The AAT3685 BatteryManager™ is a highly integrated
single cell lithium-ion/polymer battery charger IC designed
to operate with USB port or line adapter inputs. It
requires the minimum number of external components.
The AAT3685 precisely regulates battery charge voltage
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 current from the
charge supply, while keeping the port voltage regulated.
Battery temperature and charge state are fully moni-
tored for fault conditions. In the event of an over-voltage
or over-temperature failure, the device will automati-
cally 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 any one of
14 various status states to a microcontroller.
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 temperature range.
Lithium-Ion/Polymer Battery Charger
Features
• Adapter or USB Charger
▪
Programmable up to 1A 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
• 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
•
•
•
•
•
•
Cellular Telephones
Digital Still Cameras
Hand-Held PCs
MP3 Players
Personal Data Assistants (PDAs)
Other Lithium-Ion/Polymer Battery-Powered Devices
Typical Application
Enable
Adapter or USB Input
Input Hi/Lo Select
ADP/USB
PWRSEL
SETH
R
SETH
R
SETL
SETL
BAT
TS
C2
10µF
EN
CHR
BATT+
AAT3685
GND
BATT-
DATA
STAT1
STAT2
TEMP
Battery Pack
Serial Data
3685.2009.11.1.5
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1
PRODUCT DATASHEET
AAT3685
BatteryManager
TM
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
EP
Lithium-Ion/Polymer Battery Charger
Name
ADP/USB
BAT
GND
CHR
EN
TS
DATA
STAT2
STAT1
PWRSEL
SETL
SETH
Type
In
In/Out
Ground
In/Out
In
In/Out
In/Out
Out
Out
In
In/Out
In/Out
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
BAT
GND
CHR
EN
TS
1
2
3
4
5
6
12
11
10
9
8
7
SETH
SETL
PWRSEL
STAT1
STAT2
DATA
2
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3685.2009.11.1.5
PRODUCT DATASHEET
AAT3685
BatteryManager
TM
AAT3685 Feature Options
Product
AAT3685
AAT3685-1
Lithium-Ion/Polymer Battery Charger
Internal Pull-Up Resistor on EN Pin
No
Yes
Can Leave TS Pin Open
No
Yes
Absolute Maximum Ratings
1
Symbol
V
P
V
P
V
N
T
J
T
LEAD
Description
ADP/USB Input Voltage, <30ms, Duty Cycle <10%
ADP/USB Input Voltage, Continuous
BAT, PWRSEL, SETH, SETL, STAT1, STAT2, DATA, TS, CHR, EN
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads)
Value
-0.3 to 7.0
-0.3 to 6.0
-0.3 to V
P
+ 0.3
-40 to 150
300
Units
V
V
V
°C
°C
Thermal Information
2
Symbol
θ
JA
P
D
Description
Maximum Thermal Resistance (3x3mm TDFN)
Maximum Power Dissipation
Value
50
2.0
Units
°C/W
W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on an FR4 board.
3685.2009.11.1.5
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PRODUCT DATASHEET
AAT3685
BatteryManager
TM
Electrical Characteristics
1
V
ADP
= 5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= 25°C.
Symbol
Description
Conditions
Min
4.0
Rising Edge
CC Charge Current = 500mA
V
BAT
= 4.25V
V
BAT
= 4V, ADP/USB Pin Open
4.158
2.8
No Connection on CHR Pin
4.3
1.9
50
CC Mode
CC Mode
10
2.0
2.0
2000
2000
0.4
0.5
0.65
3.0
150
0.75
0.3
1.0
4.2
0.5
3.0
V
BAT_EOC
- 0.1
4.5
2.0
Lithium-Ion/Polymer Battery Charger
Typ
Max
5.5
Units
V
V
mV
mA
μA
μA
V
%
V
V
V
V
mA
%
V
V
Operation
ADP/USB
Input Voltage Range
Under-Voltage Lockout
V
UVLO
Under-Voltage Lockout Hysteresis
I
OP
Operating Current
I
SLEEP
Sleep Mode Current
Reverse Leakage Current from BAT Pin
I
Leakage
1
V
BAT_EOC
End of Charge Voltage Accuracy
ΔV
BAT
/V
BAT
EOC Voltage Tolerance
V
MIN
Preconditioning Voltage Threshold
V
RCH
Battery Recharge Voltage Threshold
V
ADP/USB_CHR
Charge Reduction Regulation
V
CHR
CHR Pin Voltage Accuracy
Current Regulation
I
CH
Charge Current
ΔI
CH
/I
CH
Charge Current Regulation Tolerance
V
SETH
SETH Pin Voltage
V
SETL
SETL Pin Voltage
K
IUH
Current Set Factor: I
CHARGE
/I
SETH
K
IUL
Current Set Factor: I
CHARGE
/I
SETL
Charging Devices
Charging MOSFET Transistor On Resistance
R
DS(ON)U
1.5
1.0
4.242
3.15
4.64
2.1
1000
V
IN
= 5.5V
Ω
1. The AAT3685 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -40°C to +85°C temperature range is guaranteed by
design.
4
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3685.2009.11.1.5
PRODUCT DATASHEET
AAT3685
BatteryManager
TM
Electrical Characteristics
1
V
ADP
= 5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= 25°C.
Symbol
Description
Conditions
Min
1.6
0.4
1.6
STAT Pin Sinks 4mA
8.0
4.4
10
50
7.5
35
80
330
15
2.3
10
0.4
0.4
Lithium-Ion/Polymer Battery Charger
Typ
Max
Units
V
V
V
V
V
mA
V
%
%
%
μA
mV
V
mV
mA
V
V
ns
μs
kHz
°C
Logic Control / Protection
V
PWRSEL(H)
Input High Threshold
V
PWRSEL(L)
Input Low Threshold
V
EN(H)
Input High Threshold
V
EN(L)
Input Low Threshold
V
STAT
Output Low Voltage
STAT Pin Current Sink Capability
I
STAT
V
OVP
Over-Voltage Protection Threshold
I
TK
/I
CHG
I
TERM
/I
CHG
I
TERM
/I
CHG
I
TS
TS1
TS2
I_DATA
V
DATA(H)
V
DATA)(L)
SQ
PULSE
t
PERIOD
f
DATA
T
OVSD
Pre-Charge Current
Charge Termination Threshold Current
Charge Termination Threshold Current
Current Source from TS Pin
TS Hot Temperature Fault
TS Cold Temperature Fault
DATA Pin Sink Current
Input High Threshold
Input Low Threshold
Status Request Pulse Width
System Clock Period
Data Output Frequency
Over-Temperature Shutdown Threshold
For
For
For
For
SETH Mode
SETL Mode
SETH Mode
SETL Mode
70
310
2.2
3.0
1.6
Threshold
Hysteresis
Threshold
Hysteresis
DATA Pin is Active Low State
90
350
2.4
0.4
Status Request
200
50
20
145
1. The AAT3685 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -40°C to +85°C temperature range is guaranteed by
