AAT3693 - Skyworks Solutions, Inc.

DATA SHEET
AAT3693: 1.6 A Li-Ion/Polymer Battery Charger
Applications
Description
 Bluetooth™ headsets
The AAT3693 BatteryManager is a highly integrated single-cell
lithium-ion/polymer (Li-Ion) battery charger that operates from a
USB port or an AC adapter input with up to 7.5 V input voltage.
The AAT3693 precisely regulates battery charge voltage and
current for 4.2 V Li-Ion battery cells. The battery charging current
can be set by an external resistor up to 1.6 A. Digital Thermal
Loop Control maintains the maximum possible battery charging
current for the given set of input to output power dissipation and
ambient temperature conditions.
 Cell phones
 Digital still cameras
 MP3 players
 Personal data assistants (PDAs)
 Other Li-Ion battery powered devices
Features
 USB or AC adapter system power charger
 Programmable from 100 mA to 1.6 A max.
 Input voltage range: 4.0 V  7.5 V
 High level of integration with internal:
 Charging device
 Reverse blocking diode
 Current sensing
 Digitized thermal regulation
 Charge current programming (ISET)
 Charge termination current programming (TERM)
 Charge timer (CT)
 Battery temperature sensing (TS)
 No-battery detection
 TS pin open detection
 Automatic recharge sequencing
 Full battery charge auto turn off/sleep mode/charge termination
 Shutdown current < 6 A
 Automatic trickle charge for battery preconditioning
 Over-voltage and over-current protection
 Emergency thermal protection
 Power-on reset and soft start
 2.2 x 2.2 TDFN Package
 TDFN (10-pin, 2.2 mm  2.2 mm) package (MSL1, 260 ºC per
JEDEC J-STD-020)
Battery charge state is continuously monitored for fault
conditions. In the event of an over-current, over-voltage, shortcircuit, or over-temperature condition, the device shuts down
automatically to protect the charging device, the control system,
and the battery under-charge. A status monitor output pin is
provided to indicate the battery charge status by directly driving
an external LED. An open-drain power source detection output is
provided to report the power supply status. With the "No-Battery
Detection" circuit integrated, the status LEDs indicate that the
battery is not present or not properly installed.
The AAT3693 is available in the Pb-free, thermally enhanced,
space-saving 10-pin, 2.2 mm  2.2 mm TDFN packages and is
specified for operation over the −40 °C to +85 °C temperature
range.
A typical application circuit is shown in Figure 1. The pin
configurations are shown in Figure 2. Signal pin assignments and
functional pin descriptions are provided in Table 1.
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201896C • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • September 2, 2014
1
DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
AAT3693
VIN
BAT +
BAT
VIN
CBAT
STAT1
STAT2
ON/OFF
Temp
EN
TS
CT
TERM
ISET
GND
CcT
Battery
Pack
RSET
RTERM
tc389
Figure 1. AAT3693 Typical Application Circuit
VIN
1
10
STAT1
2
8
TS
STAT2
3
8
TERM
EN
4
7
ISET
GND
5
6
CT
EP
BAT
tc390
Figure 2. AAT3693 Pinout – 10-Pin, 2.2 mm  2.2 mm TDFN
(Top View)
Table 1. AAT3693 Signal Descriptions
Pin No.
Name
Type
1
VIN
I
Input from USB port/adapter connector.
Description
2
STAT1
O
Charge status pin, open-drain.
3
STAT2
O
Charge status pin, open-drain.
4
EN
I
Active high enable pin (with internal pull-down).
5
GND
I/O
6
CT
I
Charge timer programming input pin (no timer if grounded).
7
ISET
I
Charge current programming input pin.
8
TERM
I
9
TS
I/O
Battery temperature sense pin.
10
BAT
O
Connect to lithium-ion battery.
EP
EP
Connect to power ground.
Charge termination current programming input pin (internal default 10% termination current if TERM is open).
Exposed paddle (bottom): connect to ground as closely as possible to the device.
Electrical and Mechanical Specifications
The absolute maximum ratings of the AAT3693 are provided in
Table 2, the thermal information is listed in Table 3, and electrical
specifications are provided in Table 4.
Typical performance characteristics of the AAT3693 are illustrated
in Figures 3 through 24.
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Table 2. AAT3693 Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Minimum
Typical
Maximum
Units
V
IN continuous
VIN
0.3
8.0
BAT, STAT1, STAT2, EN, ISET, TS
VBAT, VSTAT1, VSTAT2, VEN, VISET, VTS
0.3
VIN + 0.3
V
Junction temperature range
TJ
40
+150
ºC
Operating temperature range
TOP
40
+85
ºC
Maximum soldering temperature (at leads)
TLEAD
300
ºC
Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device.
Table 3. AAT3693 Thermal Information
Parameter
Symbol
Value
Units
Maximum thermal resistance (Note 1)
JA
50
ºC/W
Maximum power dissipation (Note 2)
PD
2
W
Note 1: Mounted on an FR4 board.
Note 2: At 25 C ambient temperature.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
Table 4. AAT3693 Electrical Specifications (1 of 2) (Note 1)
(VIN = 5.5 V, TA = –40 C to +85C, RSET = 1.47 k, RTERM = OPEN. Unless Otherwise Noted, Typical Values are TA = 25 C)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
7.5
V
Operation
Input voltage range
VIN
4.0
Rising edge
Under-voltage lockout threshold
3
VUVLO
UVLO hysteresis
Operating current
4
150
V
mV
IOP
Charge current = 100 mA
0.3
1
mA
Sleep mode current
ISLEEP
VBAT = 4.25 V or EN = GND
0.4
1
A
Leakage current from BAT pin
ILEAKAGE
VBAT = 4 V, VIN pin open
0.4
2
A
1600
mA
+10
%
Current Regulation
Charge current programmable range
ICC(RANGE)
100
Constant-current mode charge current
ICC/ICC
ISET pin voltage
VISET
Charge current set factor: ICH_CC/IISET
KI_SET
Constant current mode, VBAT = 3.6 V
TERM pin voltage
VTERM
RTERM = 13.3 k
Trickle charge current
ICH_TRK/ICC
Charge termination threshold current
ICH_TERM/ICC
VBAT = 3.6 V
−10
2
V
800
2
V
5
10
15
%ICH_CC
TERM pin open
5
10
15
% ICH_CC
RTERM = 13.3 k, ICC  800 mA
8
10
12
%
4.158
4.20
4.242
V
Voltage Regulation
Constant output voltage
VCO(REG)
Constant output voltage tolerance
VCO/VCO
Preconditioning voltage threshold
VMIN
Battery recharge voltage threshold
VRCH
0.5
(Option available for no trickle charge)
2.5
2.6
%
2.9
VBAT_REG − 0.1
V
V
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Table 4. AAT3693 Electrical Specifications (2 of 2) (Note 1)
(VIN = 5.5 V, TA = –40 C to +85C, RSET = 1.47 k, RTERM = OPEN. Unless Otherwise Noted, Typical Values are TA = 25 C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Units
0.6

Charging Devices
Charging transistor on-resistance
RDS(ON)
VIN = 4.6 V, VBAT = 4.0 V, Charge current = 1 A
Logic Control/Protection
Input high threshold
VEN(H)
Input low threshold
VEN(L)
STAT pin output voltage
VSTAT
STAT pin current sink capability
ISTAT
Over-voltage protection threshold
VOVP
Over-current protection threshold
IOCP
TS voltage range for no battery indication
TSNOBAT
1.6
V
STAT pin sinks 4 mA
(In constant voltage mode)
0.4
V
0.4
V
8
mA
4.4
V
105
%ICH_CC
VIN − 50 mV
V
Option for AA, AC, AI, AK (Note 2)
Trickle time out
tK
CCT = 0.1 F, VIN = 5 V
25
minutes
CC + CV mode time out
tC + tV
CCT = 0.1 F, VIN = 5 V
3
hours
Option for AB, AD, AJ, AK (Note 2)
No trickle charge
tK
0
minutes
CC + CV mode time out
tC + tV
CCT = 0.1 F, VIN = 5 V
3
hours
Trickle time out
tK
CCT = 0.1 F, VIN = 5 V
25
minutes
CC mode time out
tC
CCT = 0.1 F, VIN = 5 V
1
hours
CV mode time out
tV
CCT = 0.1 F, VIN = 5 V
2
hours
0
minutes
Option for AE, AG (Note 2)
Option for AF, AH (Note 2)
No trickle charge
tK
CC mode time out
tC
CCT = 0.1 F, VIN = 5 V
1
hours
CV mode time out
tV
CCT = 0.1 F, VIN = 5 V
2
hours
Option for AC, AD, AG, AH, AK, AL, BO, BP (Note 2)
Current source from TS pin
High temperature threshold
Low temperature threshold
75
A
Threshold
331
mV
Hysteresis
25
mV
Threshold
2.39
V
Hysteresis
25
mV
ITS
VTS1
VTS2
Option for AA, AB, AE, AF, AI, AJ, BM, BN (Note 2)
High temperature threshold
VTS1
29.1
Low temperature threshold
VTS2
58.2
Thermal loop entering threshold
TLOOP_IN
115
ºC
Thermal loop exiting threshold
TLOOP_OUT
85
ºC
Thermal loop regulation
TREG
Chip thermal shutdown temperature
TSHDN
Threshold
30
30.9
%VIN
60
61.8
%VIN
100
ºC
140
ºC
Note 1: Performance is guaranteed only under the conditions listed in this table.
Note 2: Only options AA, AB, AI and AJ have been released.
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Typical Performance Characteristics
(VIN = 5.5 V, TA = –40 C to +85C, RSET = 1.47 k, RTERM = OPEN. Unless Otherwise Noted, Typical Values are TA = 25 C)
1.8
10000
1.6
Charging Current (A)
100
10
1
0.1
1
10
100
RSET = 866 Ω
RSET = 1.47 kΩ
RSET = 3.16 kΩ
RSET = 8.06 kΩ
1.4
1.2
1
0.8
0.6
0.4
0.2
0
2.5
1000
tc392
1000
tc391
Charging Current (mA)
Constant Charging Current
Pre-conditioning Current
2.7
2.9
RSET (kΩ
Ω)
3.1
3.3
3.5
3.7
3.9
4.1
4.3
Battery Voltage (V)
Figure 4. Charging Current vs Battery Voltage
Figure 3. Charging Current vs RSET Values
4.22
0.09
0.08
4.21
0.06
VCO(REG) (V)
0.05
0.04
4.2
0.03
4.19
0.02
0
4.5
tc393
0.01
5
5.5
6
6.5
7
4.18
-40
7.5
tc394
ΔVCO/VCO (%)
0.07
-15
35
60
85
Temperature (°C)
Input Voltage (V)
Figure 6. Battery Charger Constant Output Voltage
vs Temperature
Figure 5. Battery Charger Constant Output Voltage Accuracy
vs Input Voltage (Battery Voltage = 4.2 V)
2.7
165
2.65
163
2.6
VMIN (V)
161
159
2.55
2.5
157
-15
10
35
60
85
Temperature (°C)
Figure 7. Preconditioning Charge Current vs Temperature
(RSET = 866 )
2.4
-40
tc396
155
-40
2.45
tc395
Preconditioning Charge Current (mA)
10
-15
10
35
60
85
Temperature (°C)
Figure 8. Preconditioning Voltage Threshold vs Temperature
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
4.14
250
225
200
4.12
150
VRCH (V)
ICH_TRK (mA)
175
RSET = 866 Ω
RSET = 1.47 kΩ
RSET = 3.16 kΩ
RSET = 8.06 kΩ
125
100
4.10
4.08
75
tc423
0
4
4.5
5
5.5
6
6.5
7
4.04
-40
7.5
tc398
4.06
50
25
-15
78
1700
76
1600
74
ITS (μA)
1800
1500
VBAT = 3.3 V
VBAT = 3.6 V
VBAT = 3.9 V
VBAT = 4.1 V
5.5
6.0
6.5
7.0
72
70
68
-40
7.5
-15
2.4
2.38
2.36
2.34
35
60
60
85
Temperature (°C)
Figure 13. Low Temperature Threshold vs Temperature
(for Option AC, AD, AG, AH, AK, AL, BO, BP)
0.345
0.34
0.335
0.33
0.325
0.32
-40
-15
10
35
60
85
Temperature (°C)
Figure 14. High Temperature Threshold vs Temperature
(for Option AC, AD, AG, AH, AK, AL, BO, BP)
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6
85
tc402
2.42
High Temperature Threshold VTS1 (V)
2.44
tc401
Low Temperature Threshold VTS2 (V)
2.46
10
35
Figure 12. Current Source at the TS Pin vs Temperature
(for Option AC, AD, AG, AH, AK, AL, BO, BP)
Figure 11. Constant Charging Current vs Input Voltage
(RSET = 866 )
-15
10
Temperature (°C)
Input Voltage (V)
2.32
-40
85
tc400
1400
5.0
60
Figure 10. Battery Recharge Voltage Threshold vs Temperature
tc399
Constant Charging Current (mA)
Figure 9. Preconditioning Charge Current vs Input Voltage
4.5
35
Temperature (°C)
Input Voltage (V)
1300
4.0
10
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2.99
2.98
2.97
-40
-15
10
35
60
1.51
1.5
1.49
1.48
tc404
3.01
1.52
High Temperature Threshold VTS1 (V)
3.02
tc403
Low Temperature Threshold VTS2 (V)
DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
1.47
-40
85
-15
10
60
85
Temperature (°C)
Temperature (°C)
Figure 16. High Temperature Threshold vs Temperature
(for Option AA, AB, AE, AF, AI, AJ, BM, BN; VIN = 5 V)
Figure 15. Low Temperature Threshold vs Temperature
(for Option AA, AB, AE, AF, AI, AJ, BM, BN; VIN = 5 V)
1.6
3.0
Constant Charging Current
Pre-conditioning Current
2.5
1.4
85 °C
25 °C
−40 °C
1.2
ISHDN (μA)
2.0
1.5
1.0
1
0.8
0.6
0.4
0.5
0.0
0.1
1
10
100
0
4.0
1000
tc406
0.2
tc405
Operating Current (mA)
35
4.5
5.0
5.5
6.0
6.5
7.0
7.5
Input Voltage (V)
RSET (kΩ)
Figure 18. Shutdown Current vs Input Voltage
Figure 17. Operating Current vs ISET Resistor
0.10
1.0
Capacitance (μF)
0.05
0.00
-0.05
Preconditioning Timeout
0.6
0.5
0.4
0.3
Preconditioning + Constant Current
Timeout or Constant Voltage Timeout
-15
10
35
60
85
Temperature (°C)
Figure 19. Counter Timeout vs Temperature (CCT = 0.1 F)
0.1
tc408
-0.10
-40
0.7
0.2
tc407
Counter Timeout (%)
0.9
0.8
0.0
0
1
2
3
4
5
Time (hours)
Figure 20. CT Pin Capacitance vs Counter Timeout
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
600
50%
85 °C
25 °C
−40 °C
550
500
RDS(ON) (Ω)
ICH_TERM/ICC (%)
40%
30%
20%
450
400
350
300
10%
10
20
30
40
50
200
3.6
60
3.9
4.2
1.2
1.3
1.1
1
1.1
0.9
VEN(L) (V)
1.2
1
0.9
0.8
85 °C
25 °C
−40 °C
0.7
5.0
5.5
6.0
5.1
Figure 22. Charging Transistor On Resistance vs Input Voltage
1.4
6.5
7.0
Input Voltage (V)
Figure 23. Input High Threshold vs Input Voltage
0.8
0.7
0.6
85 °C
25 °C
−40 °C
0.5
tc411
VEN(H) (V)
Figure 21. Termination Current to Constant Current Ratio (%)
vs Termination Resistance
4.5
4.8
Input Voltage (V)
ITERM Resistance (kΩ)
0.6
4.0
4.5
7.5
0.4
4.0
4.5
5.0
5.5
6.0
6.5
7.0
Input Voltage (V)
Figure 24. Input High Threshold vs Input Voltage
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tc412
0
tc410
tc409
250
0%
7.5
DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Reverse Blocking
IN
BAT
Current
Comparator
CV/Pre-charge
TERM
UVLO
Constant
Current
ISET
Charge
Control
EN
Thermal
Loop
Battery OV Protection
TS
CT
Over-Temp.
Protect
Watchdog
Timer
STAT1
Charge
Status
STAT2
GND
tc413
Figure 25. AAT3693 Functional Block Diagram
Functional Description
A functional block diagram is shown in Figure 25.
The AAT3693 is a high-performance battery charger designed
to charge single-cell lithium-ion or lithium-polymer batteries
with up to 1.6 A of current from an external power source. It is a
standalone charging solution, with just one external component
required for complete functionality.
The AAT3693 precisely regulates battery charge voltage and
current for 4.2 V lithium-ion/polymer battery cells with constant
current level being programmed up to 1.6 A for rapid charging
applications. The charge termination current can be
programmed by an external resistor.
The AAT3693 is rated for operation from −40 °C to +85 °C. In
the event of operating ambient temperatures exceeding the
power dissipation abilities of the device package for a given
constant current charge level, the charge control enters into
thermal limit.
The AAT3693 provides two status monitor output pins (STAT1
and STAT2) which directly drive two external LEDs to indicate
the battery charging state. With no-battery detection and status
indication, the user can be notified if the battery is not inserted
properly.
Device junction temperature and charge state are fully
monitored for fault conditions. In the event of an over-voltage or
over-temperature failure, the device automatically shuts down
to protect the charging device, control system and the battery
under-charge.
During battery charging, the device temperature rises. In some
cases with adapter charging, the power dissipation in the
device may cause the junction temperature to rise closer to its
thermal shutdown threshold.
In the event of an internal over-temperature condition caused by
excessive ambient operating temperature or excessive power
dissipation condition, the AAT3693 enables a digitally controlled
thermal loop system to reduce the charging current to prevent
the device from thermal shutdown. The digital thermal loop
maintains the maximum possible battery charging current for
the given set of input to output power dissipation and ambient
temperature conditions.
The digital thermal loop control is dynamic in the sense that it
continues to adjust the battery charging current as operating
conditions change.
The digital thermal loop resets and resumes normal operation
when the power dissipation or over-temperature conditions are
removed.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Charging Operation
Figure 26 illustrates the entire battery charging profile or
operation, which consists of four phases:
1. Preconditioning (Trickle) Charge
(trickle charge) current is 50 mA. Battery cell preconditioning
(trickle charging) is a safety precaution for deeply discharged
cells and also reduces the power dissipation in the internal
series pass MOSFET when the input-output voltage differential
is at the greatest potential.
2. Constant Current Charge
3. Constant Voltage Charge
Constant Current Charging
4. Automatic Recharge
Battery cell preconditioning continues until the battery voltage
reaches the preconditioning voltage threshold, VMIN. At this
point, the AAT3693 begins constant current charging. The
current level for this mode is programmed using a single
resistor from the ISET pin to ground. Programmed current can
be set from a minimum of 100 mA up to a maximum of 1.6 A
Battery Preconditioning
Battery charging commences only after the AAT3693 checks
several conditions in order to maintain a safe charging
environment. The input supply must be above the minimum
operating voltage (VUVLO) and the enable pin must be high.
When the battery is connected to the BAT pin, the AAT3693
checks the condition of the battery and determines which
charging mode to apply. If the battery voltage is below the
preconditioning voltage threshold, VMIN, the AAT3693 begins
preconditioning the battery cell (trickle charging) by charging at
10% of the programmed constant current. For example, if the
programmed current is 500 mA, the preconditioning mode
Charge Complete Voltage
Preconditioning
Trickle Charge
Phase
Constant Current
Charge Phase
I = Max CC
Regulated Current
Constant Voltage Charging
Constant current charging continues until the battery voltage
reaches the constant output voltage (end of charge) voltage
regulation point, VCO(REG). When the battery voltage reaches
VCO(REG), the AAT3693 will transition to constant voltage mode.
The regulation voltage is factory programmed to a nominal
4.2 V and continues charging until the charge termination
current is reached.
Constant Voltage
Charge Phase
Battery Discharge
Constant Voltage
Charge Phase
Battery Recharge
Voltage Threshold
Constant Current Mode
Voltage Threshold
Trickle Charge and
Termination Threshold
I = CC/10
tc414
Figure 26 . Current vs Voltage Profile during Charging Phases
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Power On
Reset
No
Shut Down
Enable
Yes
No
No
Charge
Suspended
Power Input
Voltage
VIN > VUVLO
Power Input
Voltage
VIN > VUVLO
Enable
And EN = High
Yes
Yes
Yes
Fault Conditions
Monitoring
OV, OT,
VTS1 < VTS < VTS2
Charge Timer
Counter
Yes
No
Preconditioning
Test
Yes
VMIN > VBAT
No
Preconditioning
(Trickle Charge)
Expired
Shut Down
Thermal Loop
Current Reduction
in CC Mode
No
Yes
Recharge Test
VBAT < VRCH
Yes
Current Phase Test
Yes
VCO > VBAT
Constant
Current Charge
Mode
No
Voltage Phase Test
ICHARGE > ICH_TERM
Device Thermal
Loop Monitor
TJ > 115 ºC
No
Yes
Constant
Voltage Charge
Mode
No
Charge Completed
Reset
tc415
Figure 27. System Operation Flowchart for the Battery Charger
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Application Information
Adapter or USB Power Input
Constant current charge levels up to 1.6 A can be programmed
by the user when powered from a sufficient input power source.
The AAT3693 operates from the adapter input over a 4.0 V to
7.5 V range. The constant current mode fast charge current for
the adapter input is set by the RSET resistor connected between
ISET and ground. Refer to Table 5 for recommended RSET values
for a desired constant current charge level; values are rounded
off to 1% standard resistance values.
Automatic Recharge
The AAT3693 has a UVLO and power-on reset feature so that if
the input supply to the VIN pin drops below the UVLO threshold,
the charger suspends charging and shuts down. When power is
reapplied to the IN pin or the UVLO condition recovers, the
system charge control assesses the state of charge on the
battery cell and automatically resumes charging in the
appropriate mode for the condition of the battery.
Enable / Disable
The AAT3693 provides an enable function to control the charger
IC on and off. The enable (EN) pin is internally pulled down.
When pulled to a logic high level, the AAT3693 is enabled.
When left open or pulled to a logic low level, the AAT3693 is
shut down. Charging is halted regardless of the battery voltage
or charging state. When the device is re-enabled, the charge
control circuit automatically resets and resumes charging
functions with the appropriate charging mode based on the
battery charge state and measured cell voltage on the BAT pin.
Programming Charge Current
The constant current mode charge level is user programmed
with a set resistor placed between the ISET pin and ground. The
accuracy of the constant charge current, as well as the
preconditioning 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 current levels from
100 mA to 1.6 A can be set by selecting the appropriate resistor
value from Table 5. The relationship between the charging
current and the RSET values is shown in Figure 3.
Table 5. Constant Charging Current vs RSET
Constant Charging Current (mA)
RSET (k)
100
16.5
200
8.06
300
5.36
400
4.02
500
3.16
600
2.67
700
2.26
800
1.87
900
1.78
1000
1.47
1250
1.18
1600
0.866
Programmable Charge Termination Current
The AAT3693 provides a user-programmable charge
termination current at the end of the charge cycle. When the
battery cell voltage sensed by the BAT pin reaches 4.2 V, the
charge control transitions from constant current fast charge
mode to constant voltage mode. In constant voltage mode, the
battery cell voltage is regulated at 4.2 V. The charge current
drops as the battery reaches its full charge capacity. When the
charge current drops to the programmed end of charge VCO(REG)
current, the charge cycle is complete and the charge controller
terminates the charging process.
If the TERM pin is left open, the termination current sets to 10%
of the constant charging current as the default value.
The charge termination current ICH_TERM can be programmed by
connecting a resistor from TERM to GND. Use the values listed
in Table 6 to set the desired charge termination current. The
relationship between the charging termination threshold current
and the RSET values is shown as Figure 21.
Table 6. Charge Termination Threshold Current Programming
Resistor Values
RTERM (k)
ICH_TERM/ ICC (%)
6.65
5%
13.3
10%
26.7
20%
40.2
30%
53.6
40%
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Table 7. LED Status Indicator (STATx Pulled Up to a Voltage Source with Resistors and LED) (Note 1)
All Options
Options AA, AB, AE, AF, AI, AJ, BM and BN
Options AC, AD, AG, AH, AK, AL, BO and BP
STAT1
STAT2 Type 1
STAT2 Type 2
Flash
Flash
Flash
Battery charging
Low
High
High
Charge complete
High
Low
High
Fault condition
High
High
Low
Event Description
No battery (with charge enabled)
Note 1: Low = LED ON; High = LED OFF.
If the desired end of charge termination current level is not
listed in Table 6, the TERM resistor value can be calculated by
the following equation:
I CH_TERM 
15 A  RTERM
 I CC
2V
When the charge current drops to the programmed charge
termination current level in the constant voltage mode, the
device terminates charging and goes into a sleep state. The
charger remains in this sleep state until the battery voltage
decreases to a level below the battery recharge voltage
threshold (VRCH).
In such cases where the AAT3693 input voltage drops, the
device enters the sleep state and automatically resumes
charging once the input supply has recovered from the fault
condition. Consuming very low current in the sleep state, the
AAT3693 minimizes battery drain when it is not charging. This
feature is particularly useful in applications where the input
supply level can fall below the battery charge or under-voltage
lockout level.
Charge Status Outputs
The AAT3693 provides battery charge status via two status
pins. These pins are internally connected to an N-channel opendrain MOSFET, which can be used drive external LEDs. The
status pins can indicate the conditions shown in Table 7.
The AAT3693 has a battery fault detector, which, when used in
conjunction with a 0.1 F 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.
Fault conditions can be one of the following:
 Battery over voltage (OV)
 Battery temperature sense hot or cold
 Battery charge timer time-out
 Chip thermal shutdown
Status LED Setup
The LEDs should be biased with as little current as necessary to
create reasonable illumination; therefore, a ballast resistor
should be placed between the LED cathode and the STAT pin
(2 mA should be sufficient to drive most low-cost green or red
LEDs). It is not recommended to exceed 8 mA for driving an
individual status LED. The required ballast resistor values can
be estimated using the following formula:
RBALLSAT 
VIN  VF ( LED )
I LED
Example:
RBALLSAT 
5.0V  2.0V
 1.5k
2mA
Note: Red LED forward voltage (VF) is typically 2.0 V @ 2 mA.
Protection Circuitry
No-Battery Detection
After a battery is inserted and the AAT3693 detects the battery,
the regular LED reporting indicates the current charging status
after 5 or 6 flashes. If the battery is not detected, the status
LEDs flash at a frequency of 1 Hz with ~50% duty cycle ratio
continuously on all options (AAT3693 AA, AB, … , BO and BT),
except AI and AJ.
The no-battery detection circuit is not integrated in the
AAT3693 AI or AJ. For these two options, the charger IC treats
the output ceramic capacitor as a battery. Since the
capacitance of the ceramic capacitor is very small, the charge
cycle is shortened and the STAT1 LED stays OFF for a long time
and ON for a very short time. Therefore, the STAT1 LED appears
to always be OFF. In addition, since the ceramic capacitor’s
discharge cycle is much longer than its charge cycle, the STAT2
LED appears to remain ON because the brief OFF phase of the
cycle is so short that the human eye cannot perceive it.
If the thermal sensing TS pin is open, it would be considered as
no battery condition. Please refer to the Battery Temperature
Fault Monitoring section to determine the proper biasing for the
TS pin.
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Programmable Watchdog Timer
The AAT3693 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
0.1 F ceramic capacitor is connected between the CT pin and
ground. When a 0.1 F ceramic capacitor is used, the device
times out a shutdown condition if the trickle charge mode
exceeds 25 minutes. The time-out timer resets at start of the
constant current mode setting the time-out to 1 hour (default).
When the device transitions to the constant voltage mode, the
timing counter is reset and times out after an additional 2 hours
if the charge current does not drop to the charge termination
level for options AE, AF, AG, AH, BM, BN, BO and BP. For all
other options (AA, AB, AC, AD, AI, AJ, AK and AL), the timeout
timer does not reset at every charging mode and times out in 3
hours (default). Table 8 list the time-out options.
Table 8. Watchdog Timer Time-Out Options
Mode
Trickle Charge (TC) timeout
Timer
Time
Units
Reset
25
Minute
Constant Current (CC) timeout
Reset
1
Hour
Constant Voltage (CV) timeout
Reset
2
Hour
Assuming: CCT = 0.1 F and VIN = 5.0 V.
The CT pin is driven by a constant current source and provides
a linear response to increases in the timing capacitor value.
Thus, if the timing capacitor were to be doubled from the
nominal 0.1 F value, the time-out periods would be doubled. If
the programmable watchdog timer function is not needed, it
can be disabled by connecting the CT pin to ground. The CT pin
should not be left floating or unterminated, as this causes 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 printed 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% tolerance or better ceramic capacitor
is recommended. Ceramic capacitor materials, such as X7R and
X5R types are a good choice for this application.
Battery Over-Voltage Protection
An over-voltage event is defined as a condition where the
voltage on the BAT pin exceeds the maximum battery charge
voltage and is set by the overvoltage protection threshold (VOVP).
If an over-voltage condition occurs, the AAT3693 charge control
shuts down the device until the voltage on the BAT pin drops
below VOVP. The AAT3693 resumes normal charging operation
after the overvoltage condition is removed. During an
over-voltage event, the STAT1 LED reports a system fault.
Over-Temperature Shutdown
The AAT3693 has a thermal protection control circuit that shuts
down charging functions if the internal die temperature exceeds
the preset thermal limit threshold. Once the internal die
temperature falls below the thermal limit, normal operation
resumes the previous charging state.
Battery Temperature Fault Monitoring
In the event of a battery over-temperature condition, the charge
control turns off the internal pass device. The STAT LEDs also
display a system fault. After the system recovers from a
temperature fault, the device resumes charging operation.
The AAT3693 checks battery temperature before starting the
charge cycle, as well as during all phases of charging. This is
accomplished by monitoring the voltage at the TS pin. This
system is intended for use with negative temperature coefficient
thermistors (NTC) that are typically integrated into the battery
package. Most of the commonly used NTC thermistors in
battery packs are approximately 10 k at room temperature
(25 °C).
For options AC, AD, AG, AH, AK, AL, BO, and BP, the TS pin has
been specifically designed to source 75 A of current to the
thermistor. The voltage on the TS pin resulting from the
resistive load should stay within a window of 331 mV to 2.39 V.
If the battery becomes too hot during charging due to an
internal fault or excessive constant charge current, the
thermistor heats up and reduces in value, pulling the TS pin
voltage lower than the TS1 threshold, and the AAT3693 stops
charging until the condition is removed, then charging is
resumed. If the use of the TS pin function is not required by the
system, it should be terminated to ground using a 10 k
resistor.
For options AA, AB, AE, AF, AI, AJ, BM, and BN, the internal
battery temperature sensing system is comprised of two
comparators which establish a voltage window for safe
operation. The thresholds for the TS operating window are
bounded by the TS1 and TS2 specifications. Referring to Table
4, the TS1 threshold = 0.30  VIN and the TS2 threshold = 0.60
 VIN. If the use of the TS pin function is not required by the
system, the TS pin should be connected to input supply VIN.
Figure 28 shows the battery temperature sensing operation.
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
VIN
IN
AAT3693
0.6 × VIN
−
RHI
TS
Battery
Pack
+
T
Battery Cold Fault
TS COLD (TS2)
− TS HOT (TS1)
Battery Hot Fault
+
RLO
0.3 × VIN
Battery Temperature Sense Circuit
AAT3693-AA, AB, AE, AF, AI, AJ, BM, BN
tc416
Figure 28. Battery Temperature Sensing Operation
RLO
 1
1 


VIN  RCOLD  RHOT  
VCOLD VHOT 




 V
 V
RHOT   IN  1   RCOLD   IN  1 
 VHOT
 VCOLD


RHI
VIN
1
VCOLD

1
1

RLO RCOLD
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
AAT3693 always provides the highest level of constant current
in the fast charge mode possible for any given ambient
temperature condition
Thermal Considerations
The AAT3693 is offered in the 10-pin, 2.2 mm  2.2 mm TDFN
package, which can provide up to 2 W of power dissipation
when 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 design. The ambient temperature around the
charger IC also has an effect on the thermal limits of a battery
charging application. The maximum limits that can be expected
for a given ambient condition can be estimated by the following
discussion.
First, the maximum power dissipation for a given situation
should be calculated:
p D(MAX) 
TJ  T A
 JA
Where:
PD(MAX) = maximum power dissipation (W)
Where,
VHOT = 0.3  VIN
JA = package thermal resistance (°C/W)
VCOLD= 0.6  VIN
TJ = thermal loop entering threshold (°C) (115°C)
VIN = input voltage
TA = ambient temperature (°C)
RHOT = NTC resistance at high temperature
Figure 29 shows the relationship between maximum power
dissipation and ambient temperature for the AAT3693.
Digital Thermal Loop Control
2
PD(MAX) (W)
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 conditions. The thermal management system
measures 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 0.44.
2.5
1.5
1
0.5
tc417
RCOLD = NTC resistance at low temperature
0
The initial thermal loop current can be estimated by the
following equation:
I TLOOP  I CC  0.44
The thermal loop control re-evaluates the circuit die
temperature every 3 seconds and adjusts the fast charge
current backup in small steps to the full fast charge current
0
25
50
75
100
TA (°°C)
Figure 29. Maximum Power Dissipation
before Entering Thermal Loop
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15
DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Capacitor Selection
Next, the power dissipation can be calculated by the following
equation:
Input Capacitor
p D  VIN  VBAT   I CC  VIN  I OP 
In general, it is good design practice to place a decoupling
capacitor closer to the IC and between the IN pin and GND.
Where:
PD = total power dissipation by the device
VIN = input voltage
VBAT = battery voltage as seen at the bat pin
ICC = constant charge current programmed for the application
IOP = quiescent current consumed by the charger IC for normal
operation (0.3 mA]
By substitution, we can derive the maximum charge current
before reaching the thermal limit condition (thermal loop). The
maximum charge current is the key factor when designing
battery charger applications.
I CH(MAX) 
Output Capacitor
PD( MAX )  VIN  I OP
VIN  VBAT
TJ ( MAX )  TA
 JA
I CH(MAX) 
 VIN  I OP
VIN  VBAT
In general, the worst condition is the greatest voltage drop
across the charger IC, when battery voltage is charged up to the
preconditioning voltage threshold and before entering thermal
loop regulation.
For best results, it is recommended to physically place the
battery pack as close as possible to the AAT3693 BAT pin. To
minimize voltage drops on the PCB, keep the high current
carrying traces adequately wide. When designing with a
charging current system >500 mA, a multilayer ground plane
PCB design is highly recommended. Putting thermal vias on the
thermal pad design effectively transfers heat from the top metal
layer of the PCB to the inner or bottom layers. The number of
thermal vias depends on the application and power dissipation.
The AAT3693 evaluation board (Figure 31) is an example layout
for reference.
1000
800
TA = 45 °C
ICC(MAX) (mA)
The AAT3693 only requires a 1 F ceramic capacitor on the
BAT pin to maintain circuit stability. This value should be
increased to 10 F or more if the battery connection is made
any distance from the charger output. If the AAT3693 is to be
used in applications where the battery can be removed from the
charger, such as with desktop charging cradles, an output
capacitor greater than 10 F may be required to prevent the
device from cycling on and off when no battery is present. It is
good design practice to place the decoupling capacitor closer to
the IC and between the BAT pin and GND.
PCB Layout Considerations
Figure 30 shows the maximum charge current at different
ambient temperatures.
TA = 25 °C
600
An input capacitor in the range of 1 F to 22 F is
recommended. If the source supply is unregulated, it may be
necessary to increase the capacitance to keep the input voltage
above the under-voltage lockout threshold during device enable
and when battery charging is initiated. If the AAT3693 adapter
input is used in a system with an external power supply source,
such as a typical AC-to-DC wall adapter, then a CIN capacitor in
the range of 10 F should be used. A larger input capacitor in
this application minimizes switching or power transient effects
when the power supply is “hot plugged”.
400
200
TA = 35 °C
4.5
4.75
TA = 60 °C
5
5.25
5.5
tc418
0
4.25
5.75
6
6.25
6.5
6.75
7
VIN (VV)
Figure 30. Maximum Charging Current
before the Digital Thermal Loop Becomes Active
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Evaluation Board Description
Package Information
The AAT3693 Evaluation Board is used to test the performance
of the AAT3693. An Evaluation Board schematic diagram is
provided in Figure 31. Layer details for the Evaluation Board are
shown in Figure 32. The Evaluation Board has additional
components for easy evaluation; the actual bill of materials
required for the system is shown in Table 9. Table 10 lists the
AAT3693 options.
Package dimensions for the 10-pin TDFN package are shown in
Figure 33. Tape & reel dimensions are shown in Figure 34.
C1
10 μF
C2
10 μF
VIN
R5
(see notes)
BAT
U1 AAT3693IDH
1
D1 (G )
R3
1.5 kΩ
2
R4 Stat1 D2 (R )
1.5 kΩ
Stat2
BAT
10
STAT1
TS
9
STAT2
TERM
VIN
3
4
5
EN
EN
ISET
GND
CT
TS
8
7
6
EP
C3
0.1 μF
R1
1.47 kΩ
R2
13.3 kΩ
R6
10 kΩ
Notes:
R5: 10 kΩ for options AA, AB, AE, AF, AI, AJ, BM, BN
R5: OPEN for options AC, AD, AG, AH, AK, AL, BO, BP
tc419
Figure 31. AAT3693 Evaluation Board Schematic
Table 9. AAT3693 Evaluation Board Bill of Materials
Component
C4
Part Number
AAT3693IDH
Description
Manufacturer
1.6A linear Li-Ion/polymer battery charger in 2.2  2.2 mm TDFN Package
Skyworks
C1, C3, C6, C7
CRCW04021501F
1.47 k, 1%, 1/4 W; 0603
Vishay
C2
CRCW04021332F
13.3 k, 1%, 1/4 W; 0603
Vishay
C5
CRCW04021002F
10 k, 5%, 1/4 W; 0603
Vishay
L1
CRCW04021001F
1.5 k, 5%, 1/4 W; 0603
Vishay
R1, R2
GRM21BR71A106KE51L
CER, 10 F, 10 V, 10% X7R, 0805
Murata
R5, R6
TMK105BJ104KV
CER, 0.1 F, 25 V, 10% X5RR, 0402
Taiyo Yuden
R3
PRPN401PAEN
Conn. Header, 2 mm zip
Sullins Electronics
R4
LTST-C190GKT
Green LED, 0603
Lite-On Inc.
R7
LTST-C190CKT
Red LED, 0603
Lite-On Inc.
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Table 10. AAT3693 Options
Temperature Sense
Status Reporting
Trickle
Charge (TC)
Timeout
Constant
Current (CC)
Charge
Timeout
Constant
Voltage (CV)
Charge
Timeout
Option
Name
Trickle
Charge
Mode
AA
Yes
30% of VIN
60% of VIN
Yes
Yes
Type 1
3 hours total
AB
No
30% of VIN
60% of VIN
Yes
Yes
Type 1
3 hours total
4.2
AC
Yes
0.33 V Fixed
2.39 V Fixed
Yes
Yes
Type 2
3 hours total
4.2
AD
No
0.33 V Fixed
2.39 V Fixed
Yes
Yes
Type 2
3 hours total
4.2
AE
Yes
30% of VIN
60% of VIN
Yes
Yes
Type 1
25 minutes
1 hour
2 hours
4.2
AF
No
30% of VIN
60% of VIN
Yes
Yes
Type 1
25 minutes
1 hour
2 hours
4.2
AG
Yes
0.33 V Fixed
2.39 V Fixed
Yes
Yes
Type 2
25 minutes
1 hour
2 hours
4.2
AH
No
0.33 V Fixed
2.39 V Fixed
Yes
Yes
Type 2
25 minutes
1 hour
2 hours
4.2
AI
Yes
30% of VIN
60% of VIN
No
Yes
Type 1
3 hours total
4.2
AJ
No
30% of VIN
60% of VIN
No
Yes
Type 1
3 hours total
4.2
AK
Yes
0.33 V Fixed
2.39 V Fixed
No
Yes
Type 2
3 hours total
4.2
AL
No
0.33 V Fixed
2.39 V Fixed
No
Yes
Type 2
3 hours total
4.2
BM
Yes
30% of VIN
60% of VIN
Yes
Yes
Type 1
25 minutes
1 hour
2 hours
4.37
BN
No
30% of VIN
60% of VIN
Yes
Yes
Type 1
25 minutes
1 hour
2 hours
4.37
BO
Yes
0.33 V Fixed
2.39 V Fixed
Yes
Yes
Type 2
25 minutes
1 hour
2 hours
4.37
BP
No
0.33 V Fixed
2.39 V Fixed
Yes
Yes
Type 2
25 minutes
1 hour
2 hours
4.37
Low
Threshold
High
Threshold
Low
Battery
Check
Charge Timer
STAT1
STAT2
Constant Output
Voltage VCO(REG)
(V)
4.2
Top Side
Middle 1 Layer
Middle 2 Layer
Bottom Side
tc420
Figure 32. AAT3693 Evaluation Board Layer Details
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Index Area
Detail "A"
1.700 ± 0.050
2.200 ± 0.050
2.200 ± 0.050
0.400 ± 0.050
0.180 ± 0.050
0.900 ± 0.050
Bottom View
Pin 1 Indicator
(optional)
0.203 REF
0.750 ± 0.050
Top View
0.400 BSC
0.500 ± 0.050
Detail "A"
Side View
tc421
Figure 33. AAT3693 14-pin TDFN Package Dimensions
4.00 ± 0.10
2.00 ± 0.05
1.00 ± 0.05
1.50 ± 0.10
3.50 ± 0.05
8.10 ± 0.20
1.75 ± 0.10
2.40 ± 0.05
0.254 ± 0.020
2.40 ± 0.05
4.00 ± 0.10
Pin 1 Location
tc422
All dimensions are in millimeters.
Figure 34. AAT3693 Tape and Reel Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201896C • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • September 2, 2014
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DATA SHEET • AAT3693: 1.6 A LI-ION/POLYMER BATTERY CHARGER
Ordering Information
Model Name
Part Marking (Note 1)
Manufacturing Part Number (Note 2)
Evaluation Board Part Number
5FXYY
AAT3693IDH-AA-T1
AAT3693IDH-AA-EVB
7DXYY
AAT3693IDH-AB-T1
AAT3693IDH-AB-EVB
AAT3693IDH-AC-T1
AAT3693IDH-AC-EVB
AAT3693IDH-AD-T1
AAT3693IDH-AD-EVB
AAT3693IDH-AE-T1
AAT3693IDH-AE-EVB
AAT3693IDH-AF-T1
AAT3693IDH-AF-EVB
AAT3693IDH-AG-T1
AAT3693IDH-AG-EVB
AAT3693IDH-AH-T1
AAT3693IDH-AH-EVB
5GXYY
AAT3693IDH-AI-T1
AAT3693IDH-AI-EVB
7EXYY
AAT3693IDH-AJ-T1
AAT3693IDH-AJ-EVB
AAT3693IDH-AK-T1
AAT3693IDH-AK-EVB
AAT3693IDH-AL-T1
AAT3693IDH-AL-EVB
AAT3693IDH-BM-T1
AAT3693IDH-BM-EVB
AAT3693IDH-BN-T1
AAT3693IDH-BN-EVB
AAT3693IDH-BO-T1
AAT3693IDH-BO-EVB
AAT3693IDH-BP-T1
AAT3693IDH-BP-EVB
AAT3693: 1.6 A Li-Ion/Polymer Battery Charger
Note 1: XYY = assembly and date code.
Note 2: Sample stock is generally held on part numbers listed in BOLD.
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September 2, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 201896C