AAT3680
Lithium-Ion/Polymer
Linear Battery Charge Controller
General Description
The AAT3680 BatteryManager is a member of
AnalogicTech's Total Power Management IC™
(TPMIC™) product family. This device is a lithium-
ion/polymer battery charge and management IC,
specifically designed for compact portable applica-
tions. The AAT3680 precisely regulates battery
charge voltage and charge current, and is capable
of two trickle charge current levels controlled by
one external pin. Battery charge temperature and
charge state are carefully monitored for fault con-
ditions. In the event of an over-current, short-cir-
cuit, or over-temperature failure, the device will
automatically shut down, protecting the charging
device and the battery under charge. A battery
charge state monitor output pin is provided to indi-
cate the battery charge status through a display
LED. The battery charge status output is a serial
interface which may also be read by a system
microcontroller.
The AAT3680 is available in a Pb-free, 8-pin MSOP
or 12-pin TSOPJW package, specified over the
-20°C to +70°C temperature range.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
BatteryManager
™
Input Voltage Range: 4.5V to 7V
1% Accurate Preset Voltages: 4.1V, 4.2V
Low Operation Current, Typically 0.5mA
Programmable Charge Current
Automatic Recharge Sequencing
Battery Temperature Monitoring
Deep Discharge Cell Conditioning
Fast Trickle Charge Option with Thermal
Over-Ride
Full Battery Charge Auto Turn-Off / Sleep Mode
Over-Voltage, Over-Current, and Over-
Temperature Protection
Power On Reset
LED Charge Status Output or System
Microcontroller Serial Interface
Temperature Range: -20°C to +70°C
8-Pin MSOP or 12-Pin TSOPJW Package
Applications
•
•
•
•
Cellular Phones
Desktop Chargers
Personal Digital Assistants (PDAs)
USB Chargers
Typical Application
R
SENSE
0.2Ω
Q1
FZT968
SMA
BATT+
VP
B34DLA
R1
1.9k
DRV
T2X
VP
CSI
BAT
C2
1µF
BATT-
AAT3680
VP
TS
RT1
TEMP
VSS
C3
10µF
RT2
LED1
R2
1k
STAT
Battery
Pack
3680.2006.03.1.6
1
AAT3680
Lithium-Ion/Polymer
Linear Battery Charge Controller
Pin Description
Pin #
TSOPJW-12
MSOP-8
Symbol
BAT
CSI
N/C
T2X
Function
Battery voltage level sense input.
Current sense input.
Not connected.
2X battery trickle charge control input. Connect this pin to VSS to
double the battery trickle charge current. Leave this pin floating for
normal trickle charge current (10% of full charge current). To enter
microcontroller fast-read status, pull this pin high during power-up.
Battery charge control output.
Common ground connection.
Battery charge status output. Connect an LED in series with 2.2kΩ
from STAT to VP to monitor battery charge state.
Power supply input pin.
Battery temperature sense input.
1
2
3
4
8
7
N/A
6
5
6
7
8, 9, 10, 11
12
5
4
3
1
2
DRV
VSS
STAT
VP
TS
Pin Configuration
TSOPJW-12
(Top View)
BAT
CSI
N/C
T2X
DRV
VSS
1
2
3
4
5
6
12
11
10
9
8
7
MSOP-8
(Top View)
TS
VP
VP
VP
VP
STAT
VP
TS
STAT
VSS
1
8
BAT
CSI
T2X
DRV
1
2
2
7
3
6
4
5
2
3680.2006.03.1.6
AAT3680
Lithium-Ion/Polymer
Linear Battery Charge Controller
Absolute Maximum Ratings
1
T
A
=25°C, unless otherwise noted.
Symbol
V
P
V
CSI
V
T2X
V
BAT
T
J
ESD
Description
V
P
Relative to V
SS
CSI to GND
T2X to GND
BAT to GND
Operating Junction Temperature Range
ESD Rating
Value
-0.3 to 7.5
-0.3 to V
P
+ 0.3
-0.3 to 5.5
-0.3 to V
P
+ 0.3
-40 to 150
Note 2
Units
V
V
V
V
°C
kV
Thermal Information
3
Symbol
Θ
JA
P
D
Description
Maximum Thermal Resistance
Maximum Power Dissipation
TSOPJW-12
MSOP-8
TSOPJW-12
MSOP-8
Value
120
150
1.0
833
Units
°C/W
W
mW
Recommended Operating Conditions
Symbol
V
P
I
DRV
T
Description
Operation Input Voltage
DRV Pin Sink Current
Ambient Temperature Range
Conditions
Min
4.5
-20
Typ
Max
7.0
40
70
Units
V
mA
°C
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions other than the conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. IC devices are inherently ESD sensitive; handling precautions required.
3. Mounted on an FR4 printed circuit board.
3680.2006.03.1.6
3
AAT3680
Lithium-Ion/Polymer
Linear Battery Charge Controller
Electrical Characteristics
V
IN
= 4.5V to 5.5V, T
A
= -20°C to 70°C, unless otherwise noted; typical values are at T
A
= 25°C.
Symbol
I
P
I
SLEEP
I
STAT(HI)
V
STAT(LOW)
I
SINK
V
OL@DRV
V
CH
V
CS
V
MIN
V
TRICKLE
T
2X
V
TS1
V
TS2
V
TERM
V
RCH
V
UVLO
V
OVP
V
OCP
Description
Operating Current
Sleep Mode Current
STAT High-Level Output
Leakage Current
STAT Low-Level Sink Current
DRV Pin Sink Current
DRV Pin Output Low
Conditions
V
IN
= 5.5V, V
CH
= 4.1V, V
CH
= 4.2V
V
IN
= 3.5V, V
CH
= 4.1V, V
CH
= 4.2V
V
IN
= 5.5V
V
IN
= 5.5V, I
SINK
= 5mA
V
IN
= 5.5V
I
SINK
= 5mA, V
IN
= 5.5V
T = 25°C
AAT3680-4.1
A
See Note 1
T = 25°C
AAT3680-4.2
A
See Note 1
V
IN
= 5.5V, V
CH
= 4.1V, V
CH
= 4.2V
AAT3680-4.1
AAT3680-4.2
T2X Floating, V
CH
= 4.1V, V
CH
= 4.2V
T2X = V
SS
V
IN
= 5.5V
V
IN
= 5.5V
V
CH
= 4.1V
V
CH
= 4.2V
V
IN
Rising, T
A
= 25°C
Min
Typ
0.5
2
Max Units
3
6
+1
0.6
1.0
4.125
4.141
4.225
4.242
110
3.06
3.16
mA
µA
µA
V
mA
V
-1
0.3
20
4.075
4.059
4.175
4.158
90
2.94
3.04
0.4
4.100
4.100
4.200
4.200
100
3.0
3.1
10
1.8
30
60
12
4.00
4.10
4.0
4.4
200
Output Charge Voltage
V
Charge Current Regulation
Preconditioning Voltage Threshold
Trickle-Charge Current Regulation
Trickle Charge Current Gain
Low-Temperature Threshold
High-Temperature Threshold
Charge Termination Threshold Voltage
Battery Recharge Voltage Threshold
Under-Voltage Lockout
Over-Voltage Protection Threshold
Over-Current Protection Threshold
mV
V
mV
29.1
58.2
4
3.92
4.018
3.5
30.9
61.8
24
4.08
4.182
4.5
% V
P
% V
P
mV
V
V
V
% V
CS
1. The AAT3680 output charge voltage is specified over 0° to 50°C ambient temperature; operation over -20°C to +70°C is guaranteed
by design.
4
3680.2006.03.1.6
AAT3680
Lithium-Ion/Polymer
Linear Battery Charge Controller
Functional Block Diagram
Microcontroller
Read Enable
2x Trickle
Charge
Control
Current Loop
Error Amp
T2X
CSI
Loop Select
MUX Driver
DRV
Microcontroller
Status Generator
STAT
V
REF
Voltage Loop
Error Amp
Charge Status
Logic Control
MUX
BAT
Voltage
Comparator
LED Signal
Generator
TS
Temperature Sense
Comparator
VSS
VP
Power-On
Reset
Under-
Voltage
Lock Out
Over-Current /
Short-Circuit
Protection
Functional Description
The AAT3680 is a linear charge controller designed
for single-cell lithium-ion/polymer batteries. It is a
full-featured battery management system IC with
multiple levels of integrated power savings, system
communication, and protection. Refer to the block
diagram (above) and flow chart (Figure 1) in this
section for details.
Cell Preconditioning
Before the start of charging, the AAT3680 checks
several conditions in order to maintain a safe charg-
ing environment. The input supply must be above
the minimum operating voltage, or under-voltage
lockout threshold (V
UVLO
), for the charging
sequence to begin. Also, the cell temperature, as
reported by a thermistor connected to the TS pin,
must be within the proper window for safe charging.
When these conditions have been met and a bat-
tery is connected to the BAT pin, the AAT3680
checks the state of the battery. If the cell voltage is
below V
MIN
, the AAT3680 begins preconditioning
the cell. This is performed by charging the cell with
10% of the programmed constant current. For
3680.2006.03.1.6
example, if the programmed charge current is
500mA, then the preconditioning mode (trickle
charge) current will be 50mA. Cell preconditioning
is a safety precaution for deeply discharged cells
and, furthermore, limits power dissipation in the
pass transistor when the voltage across the device
is largest. The AAT3680 features an optional T2X
mode, which allows faster trickle charging at
approximately two times the default rate. This
mode is selected by connecting the T2X pin to V
SS
.
If an over-temperature fault is triggered, the fast
trickle charge will be latched off, and the AAT3680
will continue at the default 10% charge current.
Constant Current Charging
Cell preconditioning continues until the voltage on
the BAT pin reaches V
MIN
. At this point, the
AAT3680 begins constant current charging (fast
charging). Current level for this mode is pro-
grammed using a current sense resistor R
SENSE
between the VP and CSI pins. The CSI pin moni-
tors the voltage across R
SENSE
to provide feedback
for the current control loop. The AAT3680 remains
in constant current charge mode until the battery
reaches the voltage regulation point, V
CH
.
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