General Description
The AAT3687 BatteryManager is a member of
AnalogicTech's Total Power Management ICTM
(TPMICTM) product family. This device 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 AAT3687 precisely regulates
battery charge voltage and current for 4.2V lithium-
ion/polymer battery cells. Adapter charge current
rates can be programmed up to 1.5A. An active
thermal management system regulates the fast
charge constant current for all ambient tempera-
ture and input vs. output voltage conditions.
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 bat-
tery 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.
The AAT3687 is available in a Pb-free, thermally-
enhanced, space-saving 12-pin TDFN 3x3mm
package and is rated over the -40C to +85C tem-
perature range.
Features
Input Voltage Range: 4.0V to 5.5V
Up to 1.5A 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-Temperature, and
Emergency Thermal Protection
Power On Reset and Soft Start
Serial Interface Status Report
12-Pin 3x3mm TDFN Package
-40C to +85C Temperature Range
Applications
Cellular Telephones
Digital Still Cameras
Hand Held PCs
MP3 Players
Personal Data Assistants (PDAs)
Other Lithium-Ion/Polymer Battery-Powered
Devices
AAT3687
Lithium-Ion/Polymer Battery Charger
Typical Application
AAT3687
C
OUT
10
F
BATT-
TEMP
Battery
Pack
ADP
ADPSET
CT
GND
TS
BAT
BATT+
R
SET
R
B1
R
B2
C
IN
10
F
C
T
0.1
F
Adapter
STAT1
LED1
LED2
STAT2
DATA
Serial Interface
EN
Enable
ADPP#
Adapter
Present
+
3687.2006.02.1.4
1
BatteryManager
TM
Pin Descriptions
Pin Configuration
TDFN33-12
(Top View)
BAT
ADP
GND
1
EN
ADPP#
TS
ADPSET
N/C
CT
STAT1
STAT2
DATA
2
3
4
5
6
12
11
10
9
8
7
Pin # Name
Type
Function
1
BAT
Out
Battery charging and sensing.
2
ADP
In
Adapter input.
3
GND
Ground
Ground connection.
4
EN
In
AAT3687: Enable pin. Logic high enables the IC.
AAT3687-2: Enable pin. Logic high enables the IC. EN tied to internal
4M
pull-up resistor to ADP.
5
ADPP#
Out
Adapter present indicator. This pin is open drain until ADP pin reaches
threshold.
6
TS
In/Out
Connect to 10k
NTC thermistor.
7
DATA
Out
Status report to microcontroller via serial interface: open drain.
8
STAT2
Out
Battery charge status indicator pin to drive an LED: active low, open drain.
9
STAT1
Out
Battery charge status indicator pin to drive an LED: active low, open drain.
10
CT
In/Out
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.
11
N/C
No connection.
12
ADPSET
In/Out
Use resistor at this pin to set adapter charging current.
EP
Exposed paddle (bottom); connect to GND directly beneath package.
AAT3687
Lithium-Ion/Polymer Battery Charger
2
3687.2006.02.1.4
AAT3687 Feature Options
Absolute Maximum Ratings
1
Thermal Information
Symbol
Description
Value
Units
JA
Maximum Thermal Resistance
2
50
C/W
P
D
Maximum Power Dissipation
2.0
W
Symbol
Description
Value
Units
V
P
ADP Input Voltage, <30ms, Duty Cycle <10%
-0.3 to 7.0
V
V
P
ADP Input Voltage, Continuous
-0.3 to 6.0
V
V
N
BAT, TS, ADPSET, ADPP#, DATA, CT, EN, STAT1, STAT2
-0.3 to V
P
+ 0.3
V
T
J
Operating Junction Temperature Range
-40 to 150
C
T
LEAD
Maximum Soldering Temperature (at leads)
300
C
Internal Pull-Up
Can Leave
Product
Trickle Charge
Resistor on EN Pin
TS Pin Open
AAT3687
Yes
No
No
AAT3687-2
No
Yes
Yes
AAT3687
Lithium-Ion/Polymer Battery Charger
3687.2006.02.1.4
3
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions 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.
Electrical Characteristics
1
V
ADP
= 5V, T
A
= -25C to +85C, unless otherwise noted. Typical values are at T
A
= 25C.
Symbol
Description
Conditions
Min
Typ
Max Units
Operation
ADP
Adapter Voltage Range
4.0
5.5
V
V
ADPP
Adapter Present Indicator Threshold
4.25
4.5
4.7
V
Voltage
V
UVLO
Under-Voltage Lockout (UVLO)
Rising Edge
3.0
V
UVLO Hysteresis
150
mV
I
OP
Operating Current
Charge Current = 100mA
0.75
1.5
mA
I
SLEEP
Sleep Mode Current
AAT3687: V
BAT
= 4.25V
0.3
1.0
A
AAT3687-2: V
BAT
= 4.25V
1
3
I
Leakage
Reverse Leakage Current from
V
BAT
= 4V, ADP Pin Open
1.0
A
BAT Pin
Voltage Regulation
V
BAT_EOC
1
End of Charge Voltage Accuracy
4.158
4.20
4.242
V
V
CH
/V
CH
Output Charge Voltage Tolerance
0.5
%
V
MIN
Preconditioning Voltage Threshold
AAT3687 Only
2.8
3.0
3.15
V
V
RCH
Battery Recharge Voltage Threshold
V
BAT_EOC
- 0.1
V
Current Regulation
I
CH
Charge Current
100
1500
mA
I
CH
/I
CH
Charge Current Regulation Tolerance
10
%
V
ADPSET
ADPSET Pin Voltage
CC Mode
2.0
V
K
IA
Current Set Factor: I
CH
/I
ADPSET
4000
Charging Devices
R
DS(ON)
Adapter Charging Transistor
V
IN
= 5.5V
0.2
0.25
0.35
On Resistance
AAT3687
Lithium-Ion/Polymer Battery Charger
4
3687.2006.02.1.4
1. The AAT3687 output charge voltage is specified over the 0 to 70C ambient temperature range; operation over the -25C to +85C
temperature range is guaranteed by design.
Electrical Characteristics
1
V
ADP
= 5V, T
A
= -25C to +85C, unless otherwise noted. Typical values are at T
A
= 25C.
Symbol
Description
Conditions
Min
Typ
Max
Units
Logic Control / Protection
V
EN(H)
Input High Threshold
1.6
V
V
EN(L)
Input Low Threshold
0.4
V
I
EN(H)
EN Input Current
AAT3687-2 Only; V
EN
= 5V
10
A
V
ADPP#
Output Low Voltage
ADPP# Pin Sinks 500A
0.4
V
T
C
Preconditioning and Constant
C
CT
= 100nF, V
ADP
= 5.5V
3.0
Hours
Current Mode Time Out
T
P
Preconditioning Time Out
AAT3687 Only; C
CT
= 100nF,
25
Minutes
V
ADP
= 5.5V
T
V
Constant Voltage Mode Time Out
C
CT
= 100nF, V
ADP
= 5.5V
3.0
Hours
V
STAT
Output Low Voltage
STAT Pin Sinks 4mA
0.4
V
I
STAT
STAT Pin Current Sink Capability
8.0
mA
V
OVP
Over-Voltage Protection Threshold
4.4
V
I
TK
/I
CHG
Pre-Charge Current
AAT3687 Only
10
%
Charge Termination Threshold
7.5
%
Current I
TERM
/I
CHG
I
TS
Current Source from TS Pin
70
80
90
A
TS1
TS Hot Temperature Fault
Threshold
310
330
350
mV
Hysteresis
15
TS2
TS Cold Temperature Fault
Threshold
2.2
2.3
2.4
V
Hysteresis
10
mV
I
DATA
DATA Pin Sink Current
DATA Pin is Active Low State
3
mA
I
ADPP#
ADPP# Current Sink
ADPP# Pin is Active Low State
8
mA
V
DATA(H)
Input High Threshold
1.6
V
V
DATA(L)
Input Low Threshold
0.4
V
SQ
PULSE
Status Request Pulse Width
Status Request
200
ns
t
PERIOD
System Clock Period
50
s
f
DATA
Data Output Frequency
20
kHz
T
REG
Thermal Loop Regulation
90
C
T
LOOP_IN
Thermal Loop Entering Threshold
110
C
T
LOOP_OUT
Thermal Loop Exiting Threshold
85
C
T
OVSD
Over-Temperature Shutdown
145
C
Threshold
AAT3687
Lithium-Ion/Polymer Battery Charger
3687.2006.02.1.4
5
1. The AAT3687 output charge voltage is specified over the 0 to 70C ambient temperature range; operation over the -25C to +85C
temperature range is guaranteed by design.
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