AAT3663IWO-4.2-2-T1 [ANALOGICTECH]
1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications; 1A线性锂离子电池充电器的单和双电池应用
| 型号： | AAT3663IWO-4.2-2-T1 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | 1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications |
| 文件： | 总22页 (文件大小：276K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
™
BatteryManager
General Description
Features
The AAT3663 BatteryManager™ is a member of
AnalogicTech’s Total Power Management ICꢀ
family. This device is an integrated single/dual cell
Lithium-Ion (Li-Ion) / polymer battery charger IC
designed to operate from USB ports or an AC
adapter inputs up to an input voltage of 13.2V.
•
•
•
4.0V ~ 13.2V Input Voltage Range
Compatible with USB or AC Adapter Sources
Programmable Fast Charge Current from
100mA to 1A
•
•
•
•
•
•
•
•
Programmable Charge Termination Current
Digital Thermal Loop Charge Reduction
Less Than 0.4µA Battery Leakage Current
Programming Charge Timer
AAT3663 precisely regulates battery charge volt-
age and current for 4.2V and 8.4V Li-Ion battery
cells. The battery charging current is user pro-
grammed up to 1A by an external resistor.
Battery Temperature Sensing
Battery Temp Sense Open Circuit Detection
Automatic Recharge Sequencing
Automatic Trickle Charge for Battery
Pre-Conditioning
Battery charge state is continuously monitored for
fault conditions. A Digital Thermal Loop Control
maintains the maximum possible battery charging
current for the optimum set of input to output power
dissipation and ambient temperature conditions. In
the event of an over-current, over-voltage, short-
circuit, or over-temperature fault condition, the
device will automatically shut down, thus protecting
the charger and the battery under charge.
•
Automatic Charge Termination
Shutdown/Sleep Mode
Less than 1µA Shutdown Current
Over-Voltage and Over-Current Protection
Power On Reset and Soft Start
3x3mm 14-pin TDFN Package
•
•
•
•
Two status monitor output pins are provided to indi-
cate the battery charge status by directly driving
external LEDs. Additionally, an open-drain power-
source detection output (ADPP#) is provided to
report presence of an input power supply
Applications
•
•
•
•
•
•
Bluetooth™ Headset
Cell Phones
The AAT3663 is available in a thermally enhanced,
space-saving, 14-pin 3x3 mm TDFN package and
is specified for operation over the -40°C to +85°C
temperature range.
Digital Still Cameras
MP3 Players
Personal Data Assistants (PDAs)
Other Li-Ion Battery Powered Devices
Typical Application
ON/OFF
EN BATS
BAT
BATT+
IN
VIN
10μF
BATT-
AAT3663
TEMP
TS
STAT1
STAT2
ADPP#
TERM
ISET
Battery
Pack
CT
GND
RSET
RTERM
CT
3663.2007.10.1.0
1
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Pin Description
Pin #
Symbol Type Function
1
EN
I
I
I
Enable pin, Active high with internal pull-down. If not used, pull high to the IN pin to
continuously enable the charger IC when input power is applied.
Charge timer programming pin. A 0.1µF ceramic capacitor should be connected
between this pin and GND. Connect directly to GND to disable the timer function.
Charge current programming pin. Connect a resistor between this pin and GND to
program the constant fast charge current.
2
3
CT
ISET
4
5
GND
TS
I/O
I/O
IC ground connection. Connect this pin to power ground.
Battery temperature sense input. Connect the Li-Ion battery pack NTC resistor termi-
nal to this pin.
6
BATS
I
Battery voltage sense pin. Connect this pin directly to the positive battery terminal. If
this function is not used, connect to the BAT pin directly.
7
8, 9
10
BAT
IN
STAT1
O
I
O
Battery charge output pin. Connect to the positive battery terminal.
Power supply input pin. Connect the input USB port or Adapter power source to this pin
Charge status pin, open-drain output. Connect the STAT1 LED with a series ballast
resistor between IN and this pin.
11
12
13
STAT2
ADPP#
TERM
O
O
I
Charge status pin, open-drain output. Connect the STAT2 LED with a series ballast
resistor between IN and this pin.
Input supply power-good status pin, open-drain output. Connect the ADPP# status
LED with a series ballast resistor between IN and this pin.
Charge termination current programming input pin. Connect a resistor between this
pin and GND to program the charge termination current. When TERM is open, the
termination current is 10% (default sertting) of the set maximum charge current.
No connection.
14
N/C
Pin Configuration
TDFN33-14
(Top View)
1
2
14
13
EN
CT
ISET
GND
TS
BATS
BAT
N/C
TERM
ADPP#
STAT2
STAT1
IN
3
4
5
6
7
12
11
10
9
8
IN
2
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
1
Absolute Maximum Ratings
Symbol
Description
Value
Units
VIN
VN
VN
TJ
TLEAD
IN Continuous Voltage
STAT1, STAT2, ADPP#, EN, BAT, BATS
TS, CT, TERM, ISET
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads)
-0.3 to 14
-0.3 to VIN + 0.3
-0.3 to 5.5
-40 to 150
300
V
V
V
°C
°C
2
Thermal Information
Symbol
Description
Value
Units
θJA
PD
Maximum Thermal Resistance (TDFN3x3)
Maximum Power Dissipation
50
2
°C/W
W
AAT3663 Feature Options
Product
Number of Battery Cells
Battery Temperature Sense
AAT3663-4.2-1
AAT3663-4.2-2
AAT3663-8.4-1
AAT3663-8.4-2
Single
Single
Dual
For Use With Any NTC Thermistor
For Use With 10kΩ NTC Thermistor
For Use With Any NTC Thermistor
For Use With 10kΩ NTC Thermistor
Dual
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 a FR4 board.
3663.2007.10.1.0
3
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Electrical Characteristics
VIN = 5V, TA = -25 to +85°C; Unless otherwise noted, typical values are at TA = 25°C
Symbol Description
Operation
Conditions
Min
Typ
Max
Units
VIN
Input Voltage Range
Under Voltage Lockout Threshold
UVLO Hysteresis
Adapter Present Indicator Threshold
Voltage, VIN – VBAT
Operating Current
4.0
3
13.2
4
V
V
mV
Rising Edge
VIN > VUVLO
VUVLO
150
50
VADPP_TH
IOP
ISHUTDOWN Shutdown Current
ILEAKAGE
ENLEAKAGE EN Pin Leakage
Voltage Regulation
100
mV
Charge Current = 100mA
VBAT = 4.25V, EN = GND
VBAT = 4V, IN = Open
VEN = 5V
0.35
0.4
0.4
0.6
1
1
2
mA
µA
µA
µA
Leakage Current from BAT Pin
AAT3663-4.2
AAT3663-8.4
4.158
8.316
4.2
8.4
4.242
8.484
VBAT_EOC
End of Charge Voltage Regulation
V
%
V
ΔVBAT_EOC
/
End of Charge Voltage Accuracy
Preconditioning Voltage Threshold
0.5
VBAT EOC
_
AAT3663-4.2
AAT3663-8.4
2.5
5.0
2.6
5.2
2.7
5.4
VMIN
VBAT_EOC
- 0.1
VBAT_EOC
- 0.2
AAT3663-4.2
AAT3663-8.4
VRCH
Battery Recharge Voltage Threshold
V
Current Regulation
ICC_RANGE Charge Current Programmable Range
100
900
1000
1100
mA
mA
V
R
ISET = 1.74KΩ (for 1A),
1000
Constant-Current Mode
ICH_CC
VBAT = 3.6V
RISET = 17.8KΩ (for 0.1A),
VBAT = 3.6V
Charge Current
80
100
2
120
VISET
KISET
ISET Pin Voltage
Charge Current Set Factor:
Constant Current Mode,
VBAT = 3.6V
900
ICH CC/ISET
_
VTERM
ICH_TRK
TERM Pin Voltage
Trickle-Charge Current
RTERM = 40kΩ
0.6
10
10
V
5
5
15
15
% ICH CC
% ICH CC
_
TERM pin open
_
ICH_TERM
Charge Termination Current Threshold RTERM = 13.3 kΩ,
8
10
12
% ICH CC
_
ICH_CC ≥ 800mA
Charging Devices
RDS(ON)
Charging Transistor ON Resistance
VIN = 5V
330
500
mΩ
Logic Control / Protection
Input High Threshold
Input Low Threshold
Output Low Voltage
STAT Pin Current Sink Capability
1.6
VEN
V
0.4
0.4
8
VSTAT
ISTAT
STAT Pin Sinks 4mA
V
mA
4
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Electrical Characteristics
VIN = 5V, TA = -25 to +85°C; Unless otherwise noted, typical values are at TA = 25°C
Symbol Description
Logic Control / Protection
Conditions
Min
Typ Max Units
VADDP#
IADPP#
Output Low Voltage
ADDP# Current Sink Capability
ADPP# Pin Sinks 4mA
0.4
8
V
mA
AAT3663-4.2
AAT3663-8.4
4.4
8.8
VOVP
Over-Voltage Protection Threshold
V
VOCP
TK
Over-Current Protection Threshold
Trickle Charging Time-Out
Trickle and Constant Current
Mode Time-Out
105
TC/8
%VCS
Hour
CT = 100nF, VIN = 5V
CT = 100nF, VIN = 5V
TC
3
Hour
TV
ITS
Constant Voltage Mode Time-Out
Current Source from TS Pin
CT = 100nF, VIN = 5V
AAT3663-2 Only
3
75
331
25
2.39
25
30
2
Hour
µA
71
316
79
346
Threshold, AAT3663-2 Only
Hysteresis, AAT3663-2 Only
Threshold, AAT3663-2 Only
Hysteresis, AAT3663-2 Only
Threshold, AAT3663-1 Only
Hysteresis, AAT3663-1 Only
Threshold, AAT3663-1 Only
Hysteresis, AAT3663-1 Only
TS1
TS2
TS Hot Temperature Fault
TS Cold Temperature Fault
High Temperature Threshold
Low Temperature Threshold
mV
mV
2.30
29.1
58.2
2.48
30.9
61.8
VTS1
%VIN
%VIN
ºC
60
2
VTS2
Digital Thermal Loop Entering
Threshold
Digital Thermal Loop Exiting
Threshold
TLOOP_IN
115
85
TLOOP_OUT
TREG
ºC
ºC
ºC
Digital Thermal Loop Regulation
100
140
15
Threshold
Hysteresis
TSHDN
Over-Temperature Shutdown
3663.2007.10.1.0
5
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Typical Characteristics
Operating Current vs ISET Resistor
Constant Charging Current
vs. Set Resistor Values
10000
2000
1800
1600
1400
1200
1000
800
1000
100
10
Constant Current Mode
600
400
200
Preconditioning Mode
10
1
0
1
100
1
10
100
RSET (kΩ)
RSET (kΩ)
End of Charge Voltage Accuracy vs. Input Voltage
(VBAT_EOC = 4.2V)
End of Charge Voltage vs. Temperature
4.220
0.100
0.075
0.050
0.025
0.000
-0.025
-0.050
-0.075
-0.100
4.215
4.210
4.205
4.200
4.195
4.190
4.185
4.180
4
5
6
7
8
9
10
11
12
13
14
-40
-15
10
35
60
85
Input Voltage (V)
Temperature (°C)
Recharge Threshold Voltage vs. Input Voltage
Recharge Voltage vs. Temperature
(VIN = 5V; RSET = 8.87kΩ)
4.120
4.115
4.110
4.105
4.100
4.095
4.090
4.085
4.080
4.14
4.13
4.12
4.11
4.10
4.09
4.08
4.07
4.06
-40
-15
10
35
60
85
4
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
Temperature (ºC)
6
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Typical Characteristics
Constant Charging Current vs. VBAT
Constant Charging Current vs. Battery Voltage
(RSET = 8.87kΩ)
1200
240
VIN = 13.2V
1.78K
210
1000
180
2.21K
VIN = 12V
VIN = 9.5V
800
150
VIN = 7.5V
600
120
3.57K
VIN = 5V
90
60
30
0
400
8.87K
200
0
2.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
2.3
2.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
VBAT (V)
Battery Voltage (V)
Preconditioning Threshold Voltage vs. Input Voltage
Preconditioning Threshold Voltage vs. Temperature
2.70
2.68
2.66
2.64
2.62
2.60
2.58
2.56
2.54
2.52
2.50
2.70
2.68
2.66
2.64
2.62
2.60
2.58
2.56
2.54
2.52
2.50
4
5
6
7
8
9
10
11
12
13
14
-40
-15
10
35
60
85
Input Voltage (V)
Temperature (°C)
Preconditioning Charge Current
vs. Input Voltage
Temperature Sense Output Current
vs. Temperature
120
100
80
60
40
20
0
80
79
78
77
76
75
74
73
72
71
70
RSET = 1.78kΩ
RSET = 2.21kΩ
RSET = 3.57kΩ
RSET = 8.87kΩ
-40
-15
10
35
60
85
4
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
Temperature (°C)
3663.2007.10.1.0
7
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Typical Characteristics
Constant Charge Current vs. Input Voltage
Shutdown Current vs. Input Voltage
2.40
240
2.10
230
85°C
VBAT = 3.5V
1.80
220
VBAT = 3V
1.50
1.20
0.90
0.60
0.30
0.00
25°C
210
200
190
-40°C
180
VBAT = 3.9V
170
VBAT = 4.1V
160
4
5
6
7
8
10
11
12
13
14
4
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
Input Voltage (V)
Input High Threshold vs. Input Voltage
Input Low Threshold vs. Input Voltage
1.60
1.60
1.40
1.20
1.00
0.80
0.60
0.40
1.40
1.20
1.00
0.80
0.60
0.40
-40°C
-40°C
25°C
25°C
85°C
85°C
4
5
6
7
8
9
10
11
12
13
14
4
5
6
7
8
9
10
11
12
13
14
Input Voltage (V)
Input Voltage (V)
Charging Transistor On Resistance
vs. Input Voltage
Termination Current to Constant Current
Ratio (%) vs. Termination Resistance
600
500
400
300
200
100
0
50
45
40
35
30
25
20
15
10
5
85°C
-40°C
25°C
0
4.0 4.4 4.8 5.2 5.6 6.0 6.4 6.8 7.2 7.6 8.0 8.4
0
10
20
30
40
50
60
Input Voltage (V)
RTERM (kΩ)
8
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Typical Characteristics
CT Pin Capacitance vs. Counter Timeout
1.0
0.9
0.8
0.7
Preconditioning Timeout
0.6
0.5
0.4
Preconditioning + Constant
Current Timeout or Constant
Voltage Timeout
0.3
0.2
0.1
0.0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Timeout (h)
3663.2007.10.1.0
9
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Functional Block Diagram
Reverse Blocking
IN
BAT
CV/
Precharge
Current
Compare
BATS
UVLO
Charge
Control
ISET
Constant
Current
TERM
Thermal
Loop
Over-Temp
Protect
Power
ADPP#
Detection
STAT 1
STAT 2
Charge
Status
EN
75μA
AAT3663-2 Only
Watchdog
Timer
CT
TS
Window Comparator
GND
In the event of an internal over-temperature condition
caused by excessive ambient operating temperature
or excessive power dissipation conditions, the
AAT3663 enables a digitally controlled thermal loop
system that will reduce the charging current to prevent
thermal shutdown. The digital thermal loop will main-
tain the maximum possible battery charging current for
a given set of input to output power dissipation and
ambient temperature conditions.
Functional Description
The AAT3663 is a high performance battery charger
designed to charge single/dual cell Lithium-Ion or
Lithium-Polymer batteries with up to 1000mAof current
from an external power source. It is a highly integrated
stand-alone charging solution, with the least external
components required for complete functionality.
The AAT3663 precisely regulates end of charge bat-
tery voltage and current for single cell 4.2V and dual
cell 8.4V lithium-ion/polymer battery with a program-
mable constant current range from 100mA to 1A for
fast charging applications. The system has a default
charge termination current set to 10 percent of the pro-
grammed fast charge constant. The charge termina-
tion current may also be user programmed by an
external resistor.
The digital thermal loop control is dynamic in the sense
that it will continue to adjust the battery charging cur-
rent as operating conditions change. The digital ther-
mal loop will reset and resume normal operation when
the power dissipation or over-temperature conditions
are removed.
In the event of an over-voltage, over-current or over-
temperature false condition beyond the limits of the
digital thermal loop system, the device will automati-
cally shut down, thus protecting the charging device,
control system, and the battery under charge.
During battery charging, the device temperature will
rise. In some cases with adapter (ADP) charging, the
power dissipation in the charge regulation pass device
may cause the junction temperature to rise and
approach the internal thermal shutdown threshold.
Excessive power dissipation is caused by the high
input adapter voltage versus the low output battery cell
voltage difference at a given constant charge current.
AAT3663 provides two status monitor pins, STAT1 and
STAT2. These pins are open drain MOSFET switches
intended to directly drive external LEDs to indicate the
battery charging state. A third status pin is prided to
10
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
indicate the presence of power on the input supply pin.
This open drain MOSFET switch may be used to either
power a display LED or to alert a system microcon-
troller for the presence on input power.
Constant Current Charging
Trickle charging continues until the battery voltage
reaches the VMIN threshold. At this point, the AAT3663
begins constant-current fast charging. The current
level for this mode is programmed using a single resis-
tor from the ISET pin to ground. Programmed current
can be set at a minimum 100mA up to a maximum 1A.
Battery Charging Operation
Figure 1 illustrates the entire battery charging profile
and operation, which consists of three phases:
Constant Voltage Charging
1. Preconditioning (Trickle) Charge
2. Constant Current Charge
3. Constant Voltage Charge
Constant current charging continues until such time
that the battery voltage reaches the voltage regulation
point VBAT_REG. When the battery voltage reaches
When power is initially applied or when a battery pack
is connected to the BAT pin, battery charging com-
mences after the AAT3663 checks several conditions
in order to maintain a safe charging environment. The
input supply must be above the minimum operating
voltage (UVLO) and the enable pin must be high (inter-
nally pulled down). When the battery is connected to
the BAT pin the AAT3663 checks the condition of the
battery and determines which charging mode to apply.
VBAT_REG, the AAT3663 will transition to the constant-
voltage mode. The regulation voltage is factory pro-
grammed to a nominal 4.2V for the AAT3663-4.2
option and to 8.4V for the AAT3663-8.4 option. Under
default conditions with the TERM pin not connected
(open circuit), constant voltage charging will continue
until the charge current has reduced to 10% of the pro-
grammed current. Placing a resistor between the
TERM pin and ground allows the user to program a
desired termination current.
Battery Preconditioning
After the charge cycle is complete, the AAT3663 turns
off the series pass device and automatically goes into
a power saving sleep mode. During this time the series
pass device will block current in both directions there-
fore preventing the battery discharging through the IC.
If the battery voltage is below VMIN, theAAT3663 begins
battery trickle charging by charging at 10% of the pro-
grammed constant-current. For example, if the pro-
grammed current is 500mA, then the trickle charge cur-
rent is 50mA. Trickle charging is a recommended safe-
ty precaution for a deeply discharged cell and maxi-
mizes the charge cycle life of the battery. In addition,
charger IC power dissipation for the internal series pass
MOSFET is minimized when the input-output voltage
differential is at its highest. This in turn allows the
charging operation to commence over wider thermal
and input to output voltage differential conditions.
TheAAT3663 will remain in sleep mode, until either the
battery terminal voltage drops below the VRCH thresh-
old, the charger EN pin is recycled or the charging
power source is reconnected. In all cases the
AAT3663 will monitor all battery parameters and
resume charging in the appropriate mode.
Preconditioning
Trickle Charge
Constant Current
Charge Phase
Constant Voltage
Charge Phase
Phase
Charge Complete Voltage
I = Max CC
Regulated Current
Constant Current Mode
Voltage Threshold
Trickle Charge and I = CC / 10
Termination Threshold
Figure 1: Current and Voltage Profile During Charging Phases.
3663.2007.10.1.0
11
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
System Operation Flow Chart
Power Input
Power On
No
Voltage
Reset
VIN>VUVLO
Yes
No
Enable
EN=HIGH
FAULT
STAT1=Off
Yes
STAT2=Off
Yes
No
Fault
Expire
Condition Monitoring
VBAT<VMIN or
Yes
ShutDown
<VBAT_REG or
OV, OT,
Mode
IBAT>ITERM
VTS1<TS<VTS2
No
Charger Timer
Control
Set
Preconditioning
Test
Yes
Yes
Preconditioning
(Trickle Charge)
VMIN >VBAT
No
Yes
Recharge
Test
No
Constant Current
Current Phase Test
Device Temp
.
p. No
VIN > VBAT_EOC
Charge Mode
Monitor
V
RCH >VBAT
T >115°C
J
No
Yes
Thermal Loop
Current Reduction
In C.C.Mode
Yes
Constant Voltage
Voltage Phase Test
IBAT >ITERM
Charge Mode
No
Charge
Completed
12
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
battery sense function inadvertently becoming an
open circuit, the BATS pin may be terminated to the
BAT pin using a 10kΩ resistor. Under normal oper-
ation, the connection to the battery terminal will be
close to 0Ω; if the BATS connection becomes an
open circuit, the 10kΩ resistor will provide feed-
back to the BATS pin from the BAT connection with
a voltage sensing accuracy loss of 1mV or less.
Application Information
Adapter or USB Power Input
Constant current charge levels up to 1A may be
programmed by the user when powered from a suf-
ficient input power source. The AAT3663 will oper-
ate over an input voltage range from 4.0V to 13.2V.
The low input voltage capability of the AAT3663
permits charging single cell Li-Ion/Poly batteries
from USB ports and lower voltage input power
sources. The high 13.2V input rating of this device
allows for the use of a wide range of input power
sources for both single and dual cell Li-Ion/Poly
applications.
Enable (EN)
EN is a logic input (active high) to enable the
charger, this function is internally pulled down to
ground. When the device is initially enabled or if
the EN pin is cycled low and then re-enabled, the
charge control circuit will automatically reset and
resume charging functions with the appropriate
charging mode based on the battery charge state
and measured battery voltage on the BATS pin.
Adapter Input Charge Inhibit and
Resume
The AAT3663 has an under-voltage lockout (UVLO)
and power on reset feature so that if the input sup-
ply to the IN pin drops below the UVLO threshold,
the charger will suspend charging and shut down.
When power is reapplied to the IN pin or the UVLO
condition recovers, the system charge control will
assess the state of charge on the battery cell and will
automatically resume charging in the appropriate
mode for the condition of the battery.
Programming Charge Current
The constant current mode charge level is user pro-
grammed with a set resistor (RSET) connected
between the ISET pin and ground. The accuracy of
the constant charge current, as well as the precon-
ditioning trickle charge current, is dominated by the
tolerance of the set resistor used. For this reason, a
1% tolerance metal film resistor is recommended for
the set resistor function. The constant charge cur-
rent levels from 100mA to 1A may be set by select-
ing the appropriate resistor value from Table 1.
Battery Connection and Battery Voltage
Sensing
Battery Connection
A single or dual cell Li-Ion/Polymer battery should
be connected between the BAT pin and ground.
Constant Charging
Current (mA)
Set Resistor
Value (kΩ)
100
200
300
400
500
600
700
800
900
1000
17.8
8.87
5.9
4.42
3.57
2.94
2.55
2.21
1.96
1.78
Battery Voltage Sensing
The BATS pin is provided to employ an accurate
voltage sensing capability to measure the positive
terminal voltage at the battery cell being charged.
This function reduces measured battery cell volt-
age error between the battery terminal and the
charge control IC. The AAT3663 charge control cir-
cuit will base charging mode states upon the volt-
age sensed at the BATS pin. The BATS pin must
be connected to the battery terminal for correct
operation. If the battery voltage sense function is
not needed, the BATS pin should be terminated
directly to the BAT pin. If there is concern of the
Table 1: RSET Values.
3663.2007.10.1.0
13
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
50
45
40
35
30
25
20
15
10
5
10000
1000
100
10
0
1
0
10
20
30
40
50
60
1
10
100
RTERM (kΩ)
RSET (kΩ)
Figure 2: Constant Charging Current vs. RSET
Resistor Values.
Figure 3: Charge Termination Current (% Value
of the Programmed Fast Charge Current) vs.
RTERM Resistance.
If the desired charge current level is not listed in
Table 1, the RSET resistor value can be found in
Figure 2 and calculated by the following equation:
If the desired charge termination current set resistor
(RTERM) value is not shown in Figure 3, the value
may be determined by the following equation:
⎛VISET
⎞
RSET = K ·
⎝ ICC
⎠
15µA · RTERM
2V
ICH_TERM
=
· ICH_CC
Where:
Where:
K = KI_SET = 900
VISET = 2V
ICC = Fast charge constant current
ICH_TERM = Charge termination current level
ICH_CC = Programmed fast charge constant current
level
Programmable Charge Termination
Current
RTERM = TERM resistor value
The AAT3663 is designed with a default charge ter-
mination current set to 10 percent of the pro-
grammed fast charge constant current level. The
charge termination current (ICH_TERM) may also be
user programmed to a level other than 10% of the
set fast charge current by connecting a set resistor
(RTERM) between the TERM pin and ground.
Battery Charge Status Indication
The AAT3663 indicates the status of the battery
under charge using three status LED driver out-
puts. These three LEDs can indicate simple func-
tions such as input power present, no battery
charge activity, battery charging, charge complete
and charge fault.
When the charge current under the constant volt-
age charging mode drops to the charge termination
threshold the device halts charging and goes into
a sleep mode. The charger will remain in the sleep
mode until the battery voltage as sensed by the
BATS pin decreases to a level below the battery
recharge voltage threshold (VRCH). Charge termi-
nation current levels based on a percentage of the
programmed fast charge current are shown in
Figure 3.
Status Indicator Display
System charging status may be displayed using
one or two LEDs in conjunction with the STAT1 and
STAT2 pins on the AAT3663. These two pins are
simple open drain N-channel MOSFET switches to
connect the status LED cathodes to ground. It is
not necessary to use both display LEDs if a user
simply wants to have a single LED to show “charg-
ing” or “not charging”. This can be accomplished
14
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
by just using the STAT1 pin and a single LED.
Using two LEDs and both STAT pins simply gives
the user more information for the various charging
states. Refer to Table 2 for LED display definitions.
The required ballast resistor values can be esti-
mated using the following formula:
(VIN
-
VF(LED)
ILED
)
RBALLAST
=
The LED anodes should be connected to the
charger power source input (IN pin).
Example:
RBALLAST
(5.0V - 2.0V)
2mA
=
= 1.5kΩ
Event Description
Charge enabled without battery
Battery charging
STAT1 STAT2
1
1
Flash
ON
OFF
OFF
Flash
OFF
ON
Note: Red LED forward voltage (VF) is typically
2.0V @ 2mA.
Charging completed
Fault
OFF
Table 2: LED Status Indicator Truth Table.
Digital Thermal Loop Control
Due to the integrated nature of the linear charging
control pass device for the adapter mode, a special
thermal loop control system has been employed to
maximize charging current under all operation con-
ditions. The thermal management system meas-
ures the internal circuit die temperature and
reduces the fast charge current when the device
exceeds a preset internal temperature control
threshold. Once the thermal loop control becomes
active, the fast charge current is initially reduced by
a factor of 0.28. The initial thermal loop current can
be estimated by the following equation:
Input Power Present Indicator
The ADDP# pin provides an additional open drain
N-channel MOSFET switch to indicate the pres-
ence of power applied to the charger input (IN pin).
This function may either be used to control an addi-
tion status LED to give a visual indication when
input power is applied. This open drain output may
also be pulled high via a pull up resistor to provide
an active low signal to a system microcontroller to
indicate the presence of applied input power.
Status Display LED Biasing
ITLOOP = ICH_CC · 0.28
The LED should be biased with as little current as
necessary to create reasonable illumination; there-
fore, a ballast resistor should be placed between
the LED cathode and the STAT pin. LED current
consumption will add to the overall thermal power
budget for the device package, hence it is good to
keep the LED drive current to a minimum. 2mA
should be sufficient to drive most low-cost green or
red LEDs. It is not recommended to exceed 8mA
for driving an individual status LED.
The thermal loop control re-evaluates the circuit die
temperature every 1.5 seconds and adjusts the fast
charge current back up in small steps to the full fast
charge current level or until an equilibrium current
is discovered and maximized for the given ambient
temperature condition. The thermal loop controls
the system charge level; therefore, the AAT3663
will always provide the highest level of constant
current in the fast charge mode possible for any
given ambient temperature condition.
1. Flashing rate depends on output capacitance.
3663.2007.10.1.0
15
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Ceramic capacitor materials, such as X7R and X5R
types, are a good choice for this application.
Protection Circuitry
Programmable Timer Function
The AAT3663 contains a watchdog timing circuit to
shut down charging functions in the event of a
defective battery cell not accepting a charge over a
preset period of time. Typically, a 0.1μF ceramic
capacitor is connected between the CT pin and
ground. When a 0.1μF ceramic capacitor is used,
the device will time out a shutdown condition if the
trickle charge mode exceeds 25 minutes and a
combined trickle charge plus constant current
mode of 3 hours. When the device transitions to
the constant voltage mode, the timing counter is
reset and will time out after an additional 3 hours if
the charge current does not drop to the charge ter-
mination level.
Over-Voltage Protection
An over-voltage event is defined as a condition
where the voltage on the BAT pin exceeds the max-
imum battery charge voltage and is set by the over-
voltage protection threshold (VOVP). If an over-volt-
age condition occurs, the AAT3663 charge control
will shut down the device until the voltage on the
BAT pin drops below VOVP. The AAT3663 will
resume normal charging operation after the over-
voltage condition is removed. During an over-volt-
age event, the STAT LEDs will report a system fault.
Over-Temperature Shutdown
The AAT3663 has a thermal protection control cir-
cuit which will shut down charging functions once
the internal die temperature exceeds the over-tem-
perature shutdown threshold. Once the internal die
temperature falls below the hysteresis, normal
operation will resume the previous charging state.
The AAT3663 has a battery fault detector, which,
when used in conjunction with a 0.1μF capacitor on
the CT pin, outputs a 1Hz signal with 50% duty
cycle at the STAT1 pin in the event of a timeout
while in the trickle charge mode.
Mode
Time
25 minutes
3 hours
Battery Temperature Fault Monitoring
Trickle Charge (TC) Time Out
Trickle Charge (TC) + Constant
Current (CC) Mode Time Out
There are two AAT3663 temperature sense options,
The AAT3663-1 and AAT3663-2. The AAT3663-1
option allows of the use of any NTC resistor. For
ease of use, the AAT3663-2 option is factory set to
function with typical 10kΩ NTC resistors and elimi-
nates the need for a resistor divider pull up to the
input power source.
Constant Voltage (CV) Mode Time Out
3 hours
Table 3: Summary for a 0.1μF Ceramic
Capacitor Used for the Timing Capacitor.
The CT pin is driven by a constant current source
and will provide a linear response to increases in
the timing capacitor value. Thus, if the timing
capacitor were to be doubled from the nominal
0.1μF value, the timeout periods would be doubled.
If the programmable watchdog timer function is not
needed, it can be disabled by terminating the CT
pin to ground. The CT pin should not be left floating
or unterminated, as this will cause errors in the
internal timing control circuit. The constant current
provided to charge the timing capacitor is very
small, and this pin is susceptible to noise and
changes in capacitance value. Therefore, the timing
capacitor should be physically located on the print-
ed circuit board layout as close as possible to the
CT pin. Since the accuracy of the internal timer is
dominated by the capacitance value, a 10% toler-
ance or better ceramic capacitor is recommended.
Regardless of the AAT3663 option selected, the
internal system control checks battery temperature
before starting the charge cycle and continues to
monitor the battery temperature during all stages of
the charging cycle. This is accomplished by moni-
toring the voltage at the TS pin. In general, the sys-
tem is intended for use with negative temperature
coefficient thermistors (NTC) which are typically
integrated into the battery package. The voltage on
the TS pin resulting from the resistive load and
applied current, should stay within a window
bounded by the TS1 and TS2 specification thresh-
olds. Refer to the Electrical Characteristics table
for the TS1 and TS2 limits for a selected AAT3663
option. If the battery becomes too hot during
charge cycle due to an internal fault or excessive
charge current, the NTC thermistor will heat up and
reduce in value. This in turn will pull the TS pin
16
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
voltage below than the TS1 threshold, and indicate
a battery cell temperature fault. The charging
process will then be suspended until the over-tem-
perature condition is removed, at which time
charging will resume. Conversely, if the battery
under charge is exposed to extreme cold ambient
temperature condition, the NTC thermistor may
increase in value and push the voltage on the TS
pin above the TS2 threshold. In such a case, the
charge cycle will be suspended and will not resume
until the cold fault condition is removed. Both TS1
and TS2 temperature fault conditions will be report
by the STAT1 and STAT2 LEDs.
AAT3663-2 Option
Most of the commonly used NTC thermistors in Li-
Ion/Polymer battery packs are approximately 10kΩ
at room temperature (25°C). The AAT3663-2 TS
pin has been specifically designed to source 75µA
of current to the 10kΩ NTC thermistor. The applied
constant current source and fixed internal TS1 and
TS2 voltage thresholds eliminate the need for a
resistor divider on the TS pin. Simply connect the
10kΩ NTC resistor between the TS pin and ground.
If the TS function is not needed for the AAT3663-2,
it may be left open (not connected).
AAT3663-1 Option
Thermal Considerations
the AAT3663-1 option utilizes an internal battery
temperature sensing system comprised of two com-
parators which establish a voltage window for safe
operation. The thresholds for the TS operating win-
dow are bounded by the TS1 and TS2 specifica-
tions. Referring to the electrical characteristics table
in this datasheet, the TS1 threshold = 0.30 · VIN and
the TS2 threshold = 0.6 · VIN. Refer to Figure 4 for
external resistor and NTC thermistor connections.
The AAT3663 is offered in a 3x3mm TDFN package
which can provide up to 2.0W of power dissipation
when it is properly bonded to a printed circuit board
and has a maximum thermal resistance of 50°C/W.
Many considerations should be taken into account
when designing the printed circuit board layout, as
well as the placement of the charger IC package in
proximity to other heat generating devices in a given
application. The ambient temperature around the
charger IC will also have an effect on the thermal lim-
its of the battery charging operation. The maximum
limits that can be expected for a given ambient con-
dition can be estimated by the following discussion.
If the use of the battery temperature sense function
is not required, it may be disabled by terminating
the TS pin to IN and ground using a 10kΩ resistor
divider network. If circuit power dissipation is a
concern, the two terminating resistor values may
be increased to 100kΩ.
VIN
AAT3663-4.2-1 or AAT3663-8.4-1
IN
0.6xVIN
RT
Battery Cold Fault
Battery Hot Fault
TS
Battery
Pack
RNTC
T
0. 30xVIN
Figure 4: External Resistor and NTC Thermistor Application Circuit.
3663.2007.10.1.0
17
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
First, the maximum power dissipation for a given sit-
uation should be calculated:
By substitution, we can derive the maximum
charge current before reaching the thermal limit
condition which will activate digital thermal loop
operation. The maximum charge current is the key
factor when designing battery charger applications.
Where:
(TJ
-
TA)
PD(MAX)
=
θJA
In general, the worst case condition is when the great-
est input to output voltage drop occurs across the
charger IC. Specifically when battery voltage is
charged up just above the preconditioning voltage
threshold and the charger enters into the constant
current fast charging mode. Under this condition, the
device will suffer the maximum possible power dissi-
pation since both the voltage difference across the
device and the charge current will be at their respec-
tive maximums. Figure 6 shows the safe fast charge
current operating region for different ambient temper-
atures. Exceeding these limits will drive the charge
control into digital thermal loop operation. When
under digital thermal loop operation, the device will
remain active and continue to charge the battery at a
reduced current level for the given ambient condition.
PD(MAX) = Maximum Power Dissipation (W)
θJA
TJ
= Package Thermal Resistance (°C/W)
= Thermal Loop Entering Threshold (ºC)
[115ºC]
TA
= Ambient Temperature (°C)
Figure 5 shows the relationship between maximum
power dissipation and ambient temperature of
AAT3663
2.50
2.00
1.50
1.00
0.50
0.00
1000
800
TA = 85°C TA = 60°C
0
25
50
75
100
600
TA = 45°C
TA (°C)
TA = 25°C
400
Figure 5: Maximum Power Dissipation Before
Entering Thermal Loop.
200
0
Next, the power dissipation can be calculated by
the following equation:
4
5
6
7
8
9
10
11
12
13
VIN (V)
Figure 6: Maximum Charging Current Before
the Digital Thermal Loop Becomes Active.
(PD(MAX) - VIN · IOP)
VIN - VBAT
ICH(MAX)
=
=
(TJ
θJA
VIN - VBAT
- TA)
Capacitor Selection
Input Capacitor
-
VIN · IOP
ICH(MAX)
In general, it is a good design practice to place a
decoupling capacitor between the IN pin and ground.
An input capacitor in the range of 1μF to 22μF is rec-
ommended. If the source supply is unregulated, it
may be necessary to increase the capacitance to
keep the input voltage above the under-voltage lock-
out threshold during device enable and when battery
charging is initiated. If the AAT3663’s input is to be
used in a system with an external power supply
source, such as a typical AC-to-DC wall adapter,
Where:
PD = Total Power Dissipation by the Device
VIN = Input Voltage
VBAT = Battery Voltage as Seen at the BAT Pin
ICH = Constant Charge Current Programmed for
the Application
IOP = Quiescent Current Consumed by the
Charger IC for Normal Operation [0.5mA]
18
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
then a CIN capacitor in the range of 10μF should be
used. A larger input capacitor in this application will
minimize switching or power transient effects when
the power supply is "hot plugged" in.
Printed Circuit Board Layout
Considerations
For the best results, it is recommended to physically
place the battery pack as close as possible to the
AAT3663 BAT pin. To minimize voltage drops on the
PCB, keep the high current carrying traces ade-
quately wide. For maximum power dissipation of the
AAT3663 3x3mm 14-pin TDFN package, the metal
substrate should be solder bonded to the board. It is
also recommended to maximize the substrate con-
tact to the PCB ground plane layer to further
increase local heat dissipation. Refer to the AAT3663
evaluation board for a good layout example.
Output Capacitor
The AAT3663 only requires a 1μF ceramic capaci-
tor on the BAT pin to maintain circuit stability. This
value should be increased to 10μF or more if the
battery connection is made any distance from the
charger output. If the AAT3663 is to be used in
applications where the battery can be removed
from the charger, such as desktop charging cra-
dles, an output capacitor 10μF or greater is recom-
mended to reduce the effect of the charger cycling
on and off when no battery is present.
Figure 7: AAT3663 Evaluation Board
Top (Component) Side Layout.
Figure 8: AAT3663 Evaluation Board
Bottom Side Layout.
3663.2007.10.1.0
19
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
JP1
ENABLE
JP4
VIN
Green
Red
Red
R7
LED D3 LED D2 LED D1
U1
TDFN33-14 AAT3663
(see note)
JP3
JP2
1
12
11
10
5
TS
EN
TS
R4 2k
ADPP#
STAT1
STAT2
IN
IN
GND
13
6
R5 2k
R6 2k
TERM
BATS
BAT
VIN
4V - 13.2V
7
3
2
8
9
4
BAT
ISET
CT
C2
10μF
R3
10k
EP
C1
R2
10k
R1
1.74k
10μF
C3
0.1μF
GND
GND
C1 1206 X7R 10μF 16V GRM31CR71C106KAC7L
C2 0805 X7R 10μF 10V GRM21BR71A106KE51L
Note: R2 = 10k is set the termination current, 7.5% from the constant charging current
R7 = 10k (for -1 option) R7 = open (for -2 option)
Figure 9: AAT3663 Evaluation Board Schematic Diagram.
20
3663.2007.10.1.0
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Ordering Information
Battery Cell
Part Number
1
2
Voltage Option
Battery Temperature Sense
Package
Marking
(Tape and Reel)
Single Cell (4.2V)
Single Cell (4.2V)
Dual Cell (8.4V)
Dual Cell (8.4V)
For Use With Any NTC Thermistor
For Use With 10kΩ NTC Thermistor
For Use With Any NTC Thermistor
For Use With 10kΩ NTC Thermistor
TDFN33-14
TDFN33-14
TDFN33-14
TDFN33-14
AAT3663IWO-4.2-1-T1
AAT3663IWO-4.2-2-T1
AAT3663IWO-8.4-1-T1
AAT3663IWO-8.4-2-T1
ZZXYY
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3663.2007.10.1.0
21
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
Package Information
TDFN33-14
Detail "A"
Index Area
1.650 0.050
3.000 0.050
Top View
Bottom View
0.425 0.050
+ 0.100
- 0.000
0.000
Pin 1 Indicator
(Optional)
Side View
Detail "A"
All dimensions in millimeters.
1. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the
lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required
to ensure a proper bottom solder connection.
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work
rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service with-
out notice. Except as provided in AnalogicTech’s terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied war-
ranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent,
copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the
customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty.
Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated.
All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
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Phone (408) 737-4600
Fax (408) 737-4611
22
3663.2007.10.1.0
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