Lithium-Ion Linear Battery Charge Controller
General Description
The AAT3680 BatteryManager™ is a member of
AnalogicTech's Total Power Management IC™
family. This device is an advanced Lithium-Ion (Li-
Ion) battery charge and management IC, specifi-
cally designed for low cost compact portable appli-
cations. In a single 8-pin package, the AAT3680
precisely regulates battery charge voltage and
charge current. This device is capable of two trick-
le charge current levels controlled by one external
pin. Battery charge temperature and charge state
are carefully monitored for fault conditions. In the
event of an over current, short circuit or over tem-
perature failure, the device will automatically shut
down, thus protecting the charging device and the
battery under charge. A battery charge state mon-
itor output pin is provided to indicate the battery
charge status though 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 an 8-pin MSOP or 12-
pin TSOPJW package, specified over -20 to 70°C
range.
AAT3680
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
BatteryManager
™
4.5V to 15V Input voltage range
1% Accurate Preset Voltages: 4.1V, 4.2V,
8.2V, 8.4V
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, current and temperature
protection
Power on reset
LED Charge Status Output or System
Microcontroller serial interface
Temperature range -20 to 70°C
8 pin MSOP, 12 pin TSOPJW package
Preliminary Information
Applications
•
•
•
•
Cellular Phones
Personal Digital Assistants (PDA's)
Desktop Chargers
USB Chargers
Typical Application
VP
R
SENSE
0.2Ω
Q1
FZT788B
BATT+
C2
10µF
R1
2.5k
DRV
T2X
VP
CSI
BAT
BATT-
AAT3680
VP
TS
RT1
TEMP
VSS
C1
4.7µF
D1
RT2
STAT
Battery
Pack
R2
1k
3680.2003.4.0.91
1
Lithium-Ion Linear Battery Charge Controller
Pin Description
Pin #
SOP, TSSOP
MSOP
AAT3680
Symbol
CSI
BAT
VP
TS
STAT
VSS
DRV
T2X
Function
Current Sense Input.
Battery voltage level sense input.
Power supply input pin.
Battery temperature sense input
Battery charge status output. Connect an LED in series with 2.2kΩ
from STAT to VP to monitor battery charge state.
Common ground connection.
Battery charge control output
2 x 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.
1
2
3
4
5
6
7
8
7
8
1
2
3
4
5
6
Pin Configuration
MSOP-8
(Top View)
VP
1
8
TSOPJW-12
(Top View)
BAT
CSI
T2X
DRV
BAT
CSI
1
2
2
8
7
6
5
6
5
TS
STAT
VSS
2
7
3
6
NC
T2X
DRV
VSS
3
4
5
6
TS
VP
VP
VP
VP
STAT
1
1
2
4
5
2
3680.2003.4.0.91
Lithium-Ion Linear Battery Charge Controller
Absolute Maximum Ratings
Symbol
V
P
V
CSI
V
T2X
V
BAT
T
J
T
LEAD
ESD
AAT3680
(T
A
=25°C unless otherwise noted)
Value
-0.3 to 16
-0.3 to V
P
+0.3
-0.3 to 5.5
-0.3 to V
P
+0.3
-40 to 150
300
Note 1
Description
V
P
relative to V
SS
CSI to GND
T2X to GND
BAT to GND
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads)
ESD Rating
Units
V
V
V
V
°C
°C
kV
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con-
ditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time.
Note 1: IC devices are inherently ESD sensitive; handling precautions required.
Thermal Information
Symbol
Θ
JA
Θ
JA
P
D
P
D
Description
Maximum Thermal Resistance (TSOPJW-12)
2
Maximum Thermal Resistance (MSOP-8)
2
Maximum Power Dissipation (TSOPJW-12)
2
Maximum Power Dissipation (MSOP-8)
2
Value
120
150
1.0
833
Units
°C/W
°C/W
W
mW
Note 2: Mounted on an FR4 printed circuit board.
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
15
40
70
Units
V
mA
°C
3680.2003.4.0.91
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Lithium-Ion Linear Battery Charge Controller
Electrical Characteristics
values are at T
A
=25°C)
Symbol
I
P
I
SLEEP
I
STAT(HI)
V
STAT(LOW)
I
SINK
V
OL@DRV
AAT3680
(V
IN
= 4.5V to 15V, T
A
= -20 to 70°C unless otherwise noted. Typical
Conditions
V
IN
= 5.5V
V
IN
= 5.5V, V
CH
= 4.1V, V
CH
= 4.2V
V
CH
= 8.2V, V
CH
= 8.4V
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
T = 25°C
AAT3680-8.2
A
see note 1
T = 25°C
AAT3680-8.4
A
see note 1
V
IN
= 5.5V, V
CH
= 4.1V, V
CH
= 4.2V
V
IN
= 12V, V
CH
= 8.2V, V
CH
= 8.4V
AAT3680-4.1
AAT3680-4.2
AAT3680-8.2
AAT3680-8.4
V = 4.1V, V
CH
= 4.2V
T2X floating
CH
V
CH
= 8.2V, V
CH
= 8.4V
T2X = V
SS
V
IN
= 15V
V
IN
= 15V
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
Min
Typ
0.5
2
3
Max Units
3
6
10
+1
0.6
1.0
4.125
4.141
4.225
4.242
8.249
8.282
8.450
8.484
110
110
3.06
3.16
6.22
6.32
mA
µA
µA
V
mA
V
-1
0.3
20
4.075
4.059
4.175
4.158
8.151
8.118
8.350
8.316
90
90
2.94
3.04
5.98
6.08
0.4
4.100
4.100
4.200
4.200
8.200
8.200
8.400
8.400
100
100
3.0
3.1
6.1
6.2
10
10
1.8
30
60
12
4.00
4.10
8.00
8.20
4.0
4.4
200
V
CH
Output Charge Voltage
V
V
CS
Charge Current Regulation
mV
V
MIN
Preconditioning Voltage Threshold
V
V
TRICKLE
T
2X
V
TS1
V
TS2
V
TERM
V
RCH
V
UVLO
V
OVP
V
OCP
Trickle-Charge Current Regulation
Trickle Charge Current Gain
Low Temperature Threshold
High Temperature Threshold
Charge termination threshold voltage
mV
30.9
61.8
24
4.08
4.182
8.16
8.364
4.5
% V
P
% V
P
mV
V
V
V
% V
CS
V
CH
= 4.1V
V
CH
= 4.2V
Battery Recharge Voltage Threshold
V
CH
= 8.2V
V
CH
= 8.4V
Undervoltage Lockout
V
IN
rising, T
A
= 25°C
Over-voltage Protection Threshold
Over-current Protection Threshold
29.1
58.2
4
3.92
4.018
7.84
8.306
3.5
Note 1: The AAT3680 output charge voltage is specified over 0° to 50°C ambient temperature; operation over -20 to 70°C is guaranteed
by design.
4
3680.2003.4.0.91
Lithium-Ion Linear Battery Charge Controller
Functional Block Diagram
Microcontroller
Read Enable
2x Trickle
Charge
Control
Current Loop
Error Amp
Loop Select
MUX Driver
AAT3680
T2X
CSI
DRV
Microcontroller
Status Generator
V
REF
Voltage Loop
Error Amp
Charge Status
Logic Control
MUX
STAT
BAT
Voltage
Comparator
LED Signal
Generator
TS
Temperature Sense
Comparator
V
SS
V
P
Power-On
Reset
Under
Voltage
Lock Out
Over Current /
Short Circuit
Protection
Functional Description
The AAT3680 is a Linear Charge Controller
designed for one and two cell Lithium Ion or
Lithium Polymer batteries. It is a full-featured bat-
tery management system IC with multiple levels of
power savings, system communication and protec-
tion integrated inside. Refer to the block diagram
and flow chart in this section.
Cell Preconditioning
Before starting charging, the AAT3680 checks sev-
eral conditions in order to maintain a safe charging
environment. The input supply must be above the
minimum operating voltage, or undervoltage lock-
out threshold (V
UVLO
), for the charging sequence to
begin. Also, the cell temperature, as reported by a
thermistor connected to TS pin, must be within the
proper window for safe charging. When these con-
ditions have been met, and a battery 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 pro-
grammed constant-current amount. For 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
the 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-tempera-
ture 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
The 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 V
P
and CSI pins. The CSI pin monitors the
voltage across R
SENSE
to provide feedback for the
current control loop. The AAT3680 remains in con-
stant current charge mode until the battery reaches
the voltage regulation point, V
CH
.
3680.2003.4.0.91
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