Data Sheets - Skyworks Solutions, Inc.

DATA SHEET
AAT3783A: 1 A Linear Li-Ion/Polymer Battery Charger with
28 V Over-Voltage Protection
Applications
Description
 Bluetooth headsets, headphones, accessories
The AAT3783A BatteryManager™ is a single-cell Lithium-Ion
(Li-Ion)/Li-Polymer battery charger IC, designed to operate from
USB ports, AC adapter inputs, or from a charger adapter up to an
input voltage of 6.5 V. For increased safety, the AAT3783A also
includes over-voltage input protection (OVP) up to 28 V.
®
 Digital still cameras
 Mobile phones
 MP3 players
 Personal data assistants (PDAs)
 Other Li-Ion/polymer battery powered devices
Features
 USB or AC adapter system power charger
 Programmable from 100 mA to 1 A maximum
 4.0 V  7.5 V input voltage range
 Over-voltage input protection up to 28 V
 High level of integration with internal:
 charging device
 reverse blocking diode
 current sensing
 Digital thermal regulation
 Charge current programming (ISET)
 Charge termination current programming (TERM)
 Charge timer (CT)
 USBSET pin sets high/low charge level
 Battery temperature sensing (TS)
 TS pin open detection
 Automatic recharge sequencing
The AAT3783A precisely regulates battery charge voltage and
current for 4.2 V Li-Ion/Polymer battery cells through an
extremely low RDS(ON) switch. When charged from an adapter or a
USB port, the battery charging current can be set by an external
resistor up to 1 A. In the case of an over-voltage condition in
excess of 6.5 V, a series switch opens to prevent damage to the
battery and charging circuitry. With the addition of an external
resistor, the OVP trip point can be programmed to a level other
than the factory set value of 6.5 V. In the case of an OVP condition
a fault flag is activated.
Battery charge state is continuously monitored for fault
conditions. In the event of an over-current, battery over-voltage,
short-circuit, or over-temperature failure, the device automatically
shuts down to protect the charging device, control system, and
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 (ADPP) is
provided to report the power supply status.
The AAT3783A is available in a thermally enhanced, space-saving
16-pin, 3 mm  4 mm TDFN package, 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.
 No trickle charge option available
 Full battery charge auto turn off/sleep state/charge termination
 Automatic trickle charge for battery preconditioning
 Battery over-voltage and over-current protection
 Emergency thermal protection
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.
 Power-on reset
 TDFN (16-pin, 3 mm  4 mm) package (MSL1, 260 ºC per
JEDEC J-STD-020)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
203159A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 1, 2014
1
DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
VIN
IN
BATS
IN
BAT
10 F
FLT
OVP
INCHR
2.2 F
BATT+
BA TT–
AAT3783A
TEMP
TS
CT
Battery
Pack
STAT
TERM
ISET
ADPP
Enable Charging
USB High/Low
Charge Level Setting
ENCHR
USBSET
RSET
GND
RTERM
CT
tc141
Figure 1. AAT3783A Typical Application Circuit
INCHR
BATS
BAT
TS
USBSET
OVP
FLT
STAT
16
1
2
EP1
15
3
14
4
13
5
EP2
12
6
11
7
10
8
9
IN
IN
ISET
GND
TERM
ENCHR
CT
ADPP
tc142
Figure 2. AAT3783A Pinout – 16-Pin, 3 mm  4 mm TDFN
(Top View)
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Table 1. AAT3783A Signal Descriptions
Pin
Name
Type
Description
1
INCHR
I/O
Internal connection between the output of the OVP stage and the input of the battery charger. Decouple with 2.2 F capacitor.
2
BATS
I
Battery sense pin. Connect directly to the battery's +terminal. If not used, BATS must be connected to BAT.
3
BAT
O
Connect to Lithium-Ion battery.
4
TS
I/O
Battery temperature sense pin.
5
USBSET
I
USB high/low charge level setting. Tie high to set high charge level; charge current is set by RSET. Tie low to set low charge level;
charge current becomes 1/5 of the high charge level setting. USBSET is internally pulled down to GND with a 10 M resistor.
6
OVP
I
Over-voltage protection threshold pin. Leave open for the default 6.5 V setting; connect to a resistor to adjust the OVP setting (see
Application Information).
7
FLT
O
Over-voltage fault flag, open drain.
8
STAT
O
Charge status pin, open drain.
9
ADPP
O
Input power-good (USB port/adapter present indicator) pin, open-drain.
10
CT
I
Charge timer programming input pin. Timer disabled when CT pin is connected to GND or the USBSET pin is tied low.
11
ENCHR
I
Active low enable pin (with internal 9 M pull-up to INCHR) for charging circuitry.
12
TERM
I
Charge termination current programming input pin (internal default 10% termination current if TERM is open).
13
GND
I/O
Connect to power ground.
14
ISET
I
Charge current programming input pin.
15, 16
IN
I
Input from USB port/adapter connector.
Electrical and Mechanical Specifications
The absolute maximum ratings of the AAT3783A are provided in
Table 2, the thermal information is listed in Table 3, and electrical
specifications are provided in Table 4.
Table 2. AAT3783A Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Minimum
Typical
Maximum
Units
IN continuous
VIN
30
Charger IN continuous
VINCHR
Fault flag continuous
VFLT
0.3
+30
V
BAT, BATS, STAT, ADPP, ENCHR, ISET, TS, USBSET, OVP
VN
0.3
VINCHR + 0.3
V
Operating junction temperature range
TJ
40
150
ºC
Maximum soldering temperature (at leads)
TLEAD
0.3
V
7.5
V
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. AAT3783A Thermal Information (Note 1)
Parameter
Symbol
Value
Units
Maximum thermal resistance
JA
50
ºC/W
Maximum power dissipation
PD
2
W
Note 1: Mounted on an FR4 board.
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Table 4. AAT3783A Electrical Specifications (1 of 2) (Note 1)
(VIN = 5 V, TA = –40 C to +85C, Unless Otherwise Noted, Typical Values are TA = 25 C)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
28
V
7.5
V
Operation
Input over-voltage protection range
VIN_MAX
Normal operating input voltage range
VIN
4.0
Over-Voltage Protection
Rising edge
Under-voltage lockout threshold
3
V
60
mV
VUVLO
UVLO hysteresis
Operating quiescent current
IQ
VIN = 5 V, IOUT = 0 A, ENCHR = VIN
34
Under-voltage lockout threshold
VOVPT
Rising edge, OVP = not connected
6.5
55
A
V
Battery Charger
Rising edge
Under-voltage lockout threshold
3
4
V
VUVLO
UVLO hysteresis
150
Operating current
IOP
Leakage current from BAT pin
IBAT
Charge current = 100 mA,
USBSET = 0 V,, ENCHR = 0 V
VBAT = 4 V, USBSET = VIN
mV
0.5
1
mA
0.4
2
A
4.20
4.242
Voltage Regulation
Output charge voltage regulation
VBAT_EOC
Output charge voltage tolerance
VCH/VCH
Preconditioning voltage threshold
VMIN
Battery recharge voltage threshold
VRCH
4.158
0.5
(Option available for no trickle charge)
2.5
2.6
V
%
2.7
VBAT_EOC  0.1
V
V
Current Regulation
Charge current programmable range
ICC_RANGE
100
Constant-current mode charge current
ICH_CC
VBAT = 3.6 V
ISET pin voltage at USBSET high setting
VISET_H
USBSET = 5 V
2
V
ISET pin voltage at USBSET low setting
VISET_L
USBSET = 0 V
0.4
V
Charge current set factor: ICH_CC/IISET
KISET
Constant current mode, VBAT = 3.6 V
800
Term pin voltage
VTERM
RTERM = 13.3 k
0.2
Termination current set factor:
ICH_TERM/ITERM
KITERM
Trickle charge current
ICH_TRK
Charge termination threshold current
ICH_TERM
10
1000
mA
10
%
V
1000
5
10
15
%ICH_CC
TERM pin open
5
10
15
%ICH_CC
RTERM = 13.3 k, ICH_CC  800 mA
8
10
12
%
Battery Charging Device
Total ON resistance (IN to BAT)
RDS(ON)
VIN = 5 V, IOUT = 1 A
550
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m
DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Table 4. AAT3783A Electrical Specifications (2 of 2) (Note 1)
(VIN = 5 V, TA = –40 C to +85C, Unless Otherwise Noted, Typical Values are TA = 25 C)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
Logic Control
Input high threshold
VUSBSET(H),
VENCHR(H)
Input low threshold
VUSBSET(L),
VENCHR(L)
Output low voltage
VSTAT
STAT pin current sink capability
ISTAT
Output low voltage
VADDP
ADPP pin current sink capability
IADPP
Output low voltage
VFLT
1.6
V
0.4
STAT pin sinks 4 mA
V
0.4
V
8
mA
ADPP pin sinks 4 mA
0.4
V
8
mA
FLT pin sinks 1 mA
0.4
V
5
mA
15
ms
FLT pin current sink capability
IFLT
FLT blanking time
tBLK_FLT
From de-assertion of O V
FLT assertion delay time from over-voltage
tD_FLT
From assertion of O V
Over-voltage response time
tRESP_OV
C rise
1
s
OVP turn-on delay time
tOVPON
Charging current = 500 mA, CINCHR = 1 F
10
ms
OVP turn-on rise time
tOVPR
Charging current = 500 mA, CINCHR = 1 F
1
ms
OVP turn-off delay time
tOVPOFF
Charging current = 500 mA, CINCHR = 1 F
6
ms
5
10
s
1
to 7 V from 5 V in 1 ns
Battery Protection
Battery over-voltage protection threshold
VBOVP
4.4
V
Battery over-current protection threshold
IBOCP
105
% ICH_CC
Trickle plus constant current mode timeout
TC
CCT = 100 nF, VIN = 5 V
3
Hour
Trickle timeout
TK
CCT = 100nF, VIN = 5 V
25
Minute
Constant voltage mode time out
TV
CCT = 100nF, VIN = 5 V
Current source from TS pin
ITS
TS hot temperature fault
TS1
Threshold
3
75
81
A
316
331
346
mV
2.30
2.39
Hysteresis
Threshold
TS cold temperature fault
Hour
69
25
mV
2.48
V
TS2
Hysteresis
25
mV
Thermal loop entering threshold
TLOOP_IN
115
°C
Thermal loop exiting threshold
TLOOP_OUT
85
°C
Thermal loop regulation
TREG
100
°C
Threshold
140
°C
Chip thermal shutdown temperature
TSHDN
Hysteresis
15
°C
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Typical Performance Characteristics
Typical performance characteristics of the AAT3783A are
illustrated in Figures 3 through 22.
1200
1000
100
10
1
1
10
100
1000
600
RSET = 3.24 kΩ
400
RSET = 8.06kΩ
200
0
2.5
1000
RSET = 2 kΩ
800
tc144
Charging Current (mA)
RSET = 1.62 kΩ
tc143
Constant Charging Current (mA)
10000
2.7
2.9
3.1
4.23
0.1
4.22
0.05
4.21
0
4.19
-0.1
4.18
6
6.5
7
4.17
-40
7.5
-15
10
4.5
35
60
85
Figure 6. End of Charge Voltage vs Temperature
Figure 5. End of Charge Regulation Tolerance vs Input Voltage
(VBAT_EOC = 4.2 V)
140
4.16
120
4.14
100
ICH_TRK (mA)
4.12
4.1
4.08
RSET = 1.62 kΩ
80
RSET = 2 kΩ
60
40
4.06
RSET = 3.24 kΩ
-15
10
35
60
85
Figure 7. Battery Recharge Voltage Threshold vs Temperature
RSET = 8.06kΩ
0
4.0
4.5
tc148
tc147
20
Temperature (°C)
5.0
5.5
6.0
6.5
7.0
7.5
Input Voltage (V)
Figure 8. Preconditioning Charge Current vs Input Voltage
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4.3
Temperature (°C)
Input Voltage (V)
Recharge Voltage (V)
4.1
4.20
-0.05
4.04
-40
3.9
tc146
VEOC (V)
0.15
5.5
3.7
Figure 4. Battery Charging Current vs Battery Voltage
tc145
ΔVBAT_EOC/VBAT_EOC (%)
Figure 3. Constant Charging Current vs Set Resistor Values
5
3.5
Battery Voltage (V)
RSET (mΩ)
-0.15
4.5
3.3
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
23
2.66
22
2.64
21
2.62
VMIN (V)
20
2.60
2.58
18
2.56
tc149
19
17
-40
-15
10
35
60
tc150
Preconditioning Charge Current (mA)
Typical Performance Characteristics
2.54
-40
85
-15
10
Figure 9. Preconditioning Charge Current vs Temperature
(RSET = 8.06 k; ICH_CC = 200 mA)
85
Figure 10. Preconditioning Voltage Threshold vs Temperature
1200
800
VBAT = 3.3 V
750
1100
700
RDS(ON) (mΩ
Ω)
VBAT = 3.6 V
1000
900
VBAT = 3.9 V
85 °C
650
600
25 °C
550
500
450
VBAT = 4.1 V
700
4
4.5
5
5.5
6
6.5
7
400
3.6
7.5
–40 °C
tc152
800
tc151
Constant Charging Current (mA)
60
Temperature (°C)
Temperature (°C)
3.8
4
4.4
4.6
4.8
5
Figure 12. Total Resistance vs Input Voltage
(IN to BAT)
Figure 11. Constant Charging Current vs Input Voltage
(RSET = 1.62 k)
2.400
335
333
331
329
tc153
327
-15
10
35
60
85
Temperature (°C)
Figure 13. Temperature Sense too Hot Threshold vs Temperature
2.395
2.390
2.385
2.380
2.375
-40
tc154
337
Temperature Sense Threshold
Voltage (TS2) (mV)
339
325
-40
4.2
Input Voltage (V)
Input Voltage (V)
Temperature Sense Threshold
Voltage (TS1) (mV)
35
-15
10
35
60
85
Temperature (°C)
Figure 14. Temperature Sense too Cold Threshold vs
Temperature
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Typical Performance Characteristics
1.0
78
0.9
0.8
Capacitance (μF)
74
72
0.7
Preconditioning Timeout
0.6
0.5
0.4
0.3
Preconditioning + Constant Current
Timeout or Constant Voltage Timeout
0.2
70
0.1
tc155
68
-40
-15
10
35
60
tc156
ITS (μA)
76
0.0
0
85
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Time (h)
Temperature (°C)
Figure 16. CT Pin Capacitance vs Counter Timeout
Figure 15. Temperature Sense Output Current vs Temperature
50
1.6
1.4
ICH_TERM/ICH_CC (%)
1.0
0.8
0.6
0.4
30
20
10
0.2
0.0
1
tc157
Preconditioning mode
10
100
tc158
IOP (mA)
40
Constant current mode
1.2
0
0
1000
10
20
1.4
1.4
1.2
25 °C
0.8
85 °C
0.4
4
4.5
5
5.5
6
6.5
7
Input Voltage (V)
Figure 19. Input Low Threshold vs Input Voltage
7.5
1.2
25 °C
–40 °C
1.0
0.8
85 °C
0.6
0.4
4
4.5
5
5.5
6
6.5
7
Input Voltage (V)
Figure 20. Input High Threshold vs Input Voltage
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8
60
tc160
VENCHR(H), VUSBSET(H) (V)
1.6
tc159
VENCHR(L), VUSBSET(L) (V)
1.6
0.6
50
Figure 18. Termination Current to Constant Current Ratio vs
Termination Resistance
Figure 17. Operating Current vs ISET Resistor
–40 °C
40
ITERM Resistance (kΩ)
RSET (kΩ)
1.0
30
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Typical Performance Characteristics
0.05
12
10
6
2
4
0
2
-2
0
-4
tc161
Time (2 ms/div)
Figure 21. FLT Blanking Time
-0.05
-0.10
-0.15
-0.20
-40
tc162
4
VOVPTRIP Error (%)
6
FLT Voltage (V)
Input Voltage (V)
0.00
8
-15
10
35
60
85
Temperature (°C)
Figure 22. OVP Trip Point vs Temperature
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
INCHR
IN
Reverse Blocking
Over-Current
Protection
IN
OVP
BAT
Current
Compare
OVP
Sense
CV/
Pre-charge
Constant
Current
FLT
Power
Detection
UVLO
Charge
Control
ADPP
USBSET
BATS
INCHR
Over-Temp. Thermal
Protect
Loop
Charge
Status
ISET
TERM
ENCHR
STAT
CT
TS
GND
tc163
Figure 23. AAT3783A Functional Block Diagram
Functional Description
Battery Preconditioning
The AAT3783A is a high-performance battery charger designed
to charge single-cell Lithium-Ion or Polymer batteries with up to
1000 mA of current from an external power source. It is a
standalone charging solution, with just one external component
required (two more for options) for complete functionality. The
device includes input voltage protection (OVP) to up to +28 V.
OVP consists of a low resistance P-channel MOSFET in series
with the charge control MOSFET, and also consists of undervoltage lockout protection, over-voltage monitor, and fast shutdown circuitry with a fault output flag.
Battery charging commences only after the AAT3783A checks
several conditions in order to maintain a safe charging
environment. The input supply must be greater than the
minimum operating voltage (VUVLO) and the enable pin must be
high. When the battery is connected to the BAT pin, the
AAT3783A checks the condition of the battery and determines
which charging mode to apply. If the battery voltage is below
the preconditioning voltage threshold, VMIN, then the AAT3783A
begins preconditioning the battery cell (trickle charging) by
charging at 10% of the programmed constant current (set by
the ISET resistor), regardless of whether USBSET high or
USBSET low charge level is selected. For example, if the
programmed current is 500 mA, then the preconditioning mode
(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.
A functional block diagram is shown in Figure 23.
Battery Charging Operation
Figure 24 illustrates the entire battery charging profile or
operation, which consists of three phases:
1. Preconditioning (Trickle) Charge
2. Constant Current Charge
3. Constant Voltage Charge
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Charge Complete Voltage
Regulated Current
Preconditioning
Trickle Charge
Phase
Constant Current
Charge Phase
Constant Voltage
Charge Phase
I = Max CC
Constant Current Mode
Voltage Threshold
Trickle Charge and I = CC /10
Termination Threshold
tc164
Figure 23. Current vs Voltage Profile during Charging Phases
Constant Current Charging
Thermal Considerations
Battery cell preconditioning continues until the battery voltage
reaches the preconditioning voltage threshold, VMIN. At this
point, the AAT3783A begins constant current charging. The
current level for this mode is programmed using a single
resistor from the ISET pin to ground. The programmed current
can be set at a minimum 100 mA up to a maximum of 1 A.
The actual maximum charging current is a function of the
charge adapter input voltage, the battery charge state at the
moment of charge, the ambient temperature, and the thermal
impedance of the package. The maximum programmable
current may not be achievable under all operating parameters.
The USBSET pin is used for high/low charge level setting. Tie
high to set the charge level to high and the charge current to
the level set by the ISET pin resistor. Tie low to set the charge
level to low and the charge current to 1/5 of the high charge
level setting. USBSET is pulled down to GND internally by a
200 k resistor.
Over-Voltage Protection
Constant Voltage Charging
Constant current charging will continue until such time that the
battery voltage reaches the voltage regulation point, VBAT_EOC.
When the battery voltage reaches VBAT_EOC, the AAT3783A
switches 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.
In normal operation, a P-channel MOSFET acts as a slew-rate
controlled load switch, connecting and disconnecting the power
supply from IN to INCHR. A low resistance MOSFET is used to
minimize the voltage drop between the voltage source and the
charger and to reduce the power dissipation. When the voltage
on the input exceeds the over-voltage trip point (internally set
by the factory or externally programmed by a resistor connected
to the OVP pin), the device immediately turns off the internal Pchannel FET which disconnects the charger from the abnormal
input voltage, therefore preventing any damage to the charger.
Simultaneously, the fault flag is raised to alert the system.
If an over-voltage condition is applied at the time of the device
enable, then the switch remains OFF.
Charge Status Output
OVP Under-Voltage Lockout (UVLO)
The AAT3783A provides battery charge status via a status pin.
This pin is internally connected to an N-channel open-drain
MOSFET, which can be used drive an external LED. The status
pin can indicate the conditions in Table 5:
The AAT3783A OVP circuitry has a fixed 3 V under-voltage
lockout level (UVLO). When the input voltage is less than the
UVLO level, the MOSFET is turned off. 100 mV of hysteresis is
included to ensure circuit stability.
Table 5. LED Status Indicator
Over-Current Protection
Event Description
Status
No battery charging activity
OFF
Battery charging via adapter or USB port
ON
Charging completed
OFF
The AAT3783A over-current protection provides fault-condition
protection that limits the charge current to approximately 1.6 A
under all conditions, even if the ISET pin gets shorted to ground.
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
FLT Blanking Time
USBSET
The FLT output is an active-low open-drain fault (OV) reporting
output. A pull-up resistor should be connected from FLT to the
logic I/O voltage of the host system. FLT is asserted
immediately when an over-voltage fault occurs (only about a 1
s inherited internal circuit delay). A 10 ms blanking is applied
to the FLT signal prior to de-assertion.
USB charge current level can be selected by toggling the
USBSET pin. When USBSET = 0, the charge current is set to 1/5
of the programmed charge current level set by ISET. When
USBSET = logic high (1.6 V  5 V), the charge current is set to
the full programmed charge current level set by ISET.
Enable/Disable
The AAT3783A provides an enable function to turn the charger
on and off through the ENCHR pin; ENCHR has an internal pullup resistor (9 M to INCHR); the OVP switch is permanently
enabled regardless of ENCHR enable or disable.
For example, when charging current is set to 500 mA (RSET =
3.24 k) and USBSET = logic low (0 V), the charge current is
100 A, which is 1/5 of the programmed charge current. When
USBSET = logic high (1.6 V  5 V), the charge current becomes
100% (500 mA).
Figure 24 shows the system operation flowchart for the battery
charger.
OVP Turn-On Delay Time
On initial power-up, if VIN < UVLO or if VOVP > 6.5 V, the PMOS
is held off. If UVLO < VIN and VOVP < 6.5 V, the device enters
startup after a 10 ms internal delay.
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Power Input
Voltage
VIN > VUVLO
Power On
Reset
No
Yes
OVP Condition
Monitoring
VIN > 6.5 V ?
Yes
Disconnect
Input
Shut
ShutDown
Down
fromMode
Charger
Mode
No
Fault
Condition Monitoring Yes
VTS1<TS<VTS2,
OV, OT?
Shutdown
Shut
ShutDown
Down
Mode
Mode
Mode
Expire
No
Charger
Timer
Shut
ShutDown
Down
Control
Mode
Mode
Preconditioning
Test
VMIN > VBAT
Yes
Preconditioning
Shut
Shut Down
Down
Mode
Trickle
Charge
Mode
Yes
Shut
Constant
Current
Shut Down
Down
Charge
Mode
Mode
Mode
Enable
No
No
Recharge Test
VRCH > VBAT
Yes
Current Phase Test
VBAT_EOC > VBAT
Device Temp. Monitor
TJ > 115 ºC
No
Voltage Phase Test
VBAT > ITERM
No
Yes
Yes
Constant
Voltage
Shut
Shut Down
Down
Charge
Mode
Mode
Mode
Thermal Loop
Current Reduction
In C. C. Mode
No
Charge
Charge
Completed
Completed
tc165
Figure 24. System Operation Flowchart for the Battery Charger
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Application Information
Programming the Over-Voltage Protection Trip Point
The default over-voltage protection trip point of the AAT3783A
is set to 6.5 V by the factory. However, the over-voltage
protection trip point can be programmed from 3.8 V to 7.5 V by
the user with one external resistor, either R5 or R6. The
placement of R5 is between IN and OVP. The placement of R6 is
between OVP and GND. The OVP trip points can be
approximated by the following formulas:
If using R5 (OVP to IN):
VOVP _ TRIPPOINT 

1.1  1.426
0.29
If using R6 (OVP to GND):
VOVP _ TRIPPOINT 
R5  1.498   0.29 

1.1  1.426  0.29
0.29
R6  1.498 
R6  1.498 
Here, voltage in V, resistance in M.
Table 6 summarizes resistor values for various over-voltage
protection trip points. Use 1% tolerance metal film resistors for
programming the desired OVP trip point.
needed, the BATS pin should be terminated directly to the BAT
pin. If there is concern of the battery sense function
inadvertently becoming an open circuit, the BATS pin may be
terminated to the BAT pin using a 10 k resistor. Under normal
operation, the connection to the battery terminal is close to 0 ;
if the BATS connection becomes an open circuit, the
10 k resistor provides feedback to the BATS pin from the BAT
connection with a voltage sensing accuracy loss of 1 mV or
less.
Constant 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 (see Figure 25). 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 A may be set by selecting the appropriate
resistor value from Table 7.
Table 7. RSET Values
Constant Charging Current (mA)
Set Resistor Value (k)
10
162
Table 6. Programming OVP Trip Point for AAT3783A with One
Resistor
R6 (M)
R5 (M)
20
80.6
VOVP_TRIPPOINT (V)
50
32.4
short
open
7.5
100
16
0.499
open
7.25
200
8.06
1.3
open
7.0
300
5.36
3.01
open
6.75
400
4.02
open
open
6.5
500
3.24
open
4.99
5.5
600
2.67
open
2.49
5.0
700
2.26
open
1.0
4.5
800
2
open
short
3.87
900
1.78
1000
1.62
Battery Connection and Battery Voltage Sensing
Battery Connection (BAT)
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
voltage error between the battery terminal and the charge
control IC. The AAT3783A charge control circuit will base
charging mode states upon the voltage 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
1000
100
10
tc166
Battery Voltage Sensing (BATS)
Constant Charging Current (mA)
10000
A single cell Li-Ion/Polymer battery should be connected
between the BAT pin and ground.
1
1
10
100
Figure 25. Constant Charging Current vs Set Resistor Values
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1000
RSET (kΩ
Ω)
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Data Sheet • AAT3620 Single Cell Li+ Switch Mode Battery Charger
Charge Termination Current
The charge termination current ICH_TERM can be programmed by
connecting a resistor from TERM to GND:
I CH _ TERM 
15 A  RTERM
 I CH _ CC
2V
Where:
ICH_TERM = charge termination current level
ICH_CC = programmed fast charge constant current level
RTERM = TERM resistor value
If the TERM pin is left open, the termination current is set to
10% of the constant charging current as the default value.
When the charge current drops to the defaulted 10% of the
programmed charge current level or programmed terminated
current in the constant voltage mode, the device terminates
charging and goes into a sleep state. If the programmed
termination current exceeds 1/5 of the fast charge level, and
the low charge level is selected (USBSET = low), charging
terminates immediately upon reaching constant voltage mode.
The charger remains in this sleep state until the battery voltage
falls to a level below the battery recharge voltage threshold
(VRCH).
Consuming very low current in the sleep state, the AAT3783A
minimizes battery drain when it is not charging. This feature is
particularly useful in applications where the input supply level
may fall below the battery charge or under-voltage lockout
level. In such cases where the AAT3783A input voltage drops,
the device enters sleep state and automatically resumes
charging once the input supply has recovered from the fault
condition.
Protection Circuitry
Programmable Watchdog Timer
The AAT3783A 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 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 termination level, as shown in
Table 8.
Table 8. Summary for a 0.1 F Ceramic Capacitor Used for the
Timing Capacitor
Mode
Time
Trickle charge (TC) time out
25 minutes
Trickle charge (TC) + constant current (CC) mode time out
3 hours
Constant voltage (CV) mode time out
3 hours
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 timeout periods would be doubled. If
the programmable watchdog timer function is not needed, it
can be disabled by terminating the CT pin or the USBSET 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 good choices 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 over-voltage protection threshold
(VBOVP). If an over-voltage condition occurs, the AAT3783A
charge control shuts down the device until the voltage on the
BAT pin drops below VOVP.
The AAT3783A resumes normal charging operation after the
over-voltage condition is removed.
Battery Temperature Monitoring
In the event of a battery over-temperature condition, the charge
control turns off the internal pass device. After the system
recovers from a temperature fault, the device resumes charging
operation. The AAT3783A checks battery temperature before
starting the charge cycle, as well as during all stages 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) which 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). 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
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9
DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
excessive constant charge current, the thermistor will heat up
and reduce in value, pulling the TS pin voltage lower than the
TS1 threshold, and the AAT3783A stops charging until the
condition is removed, when 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. Alternatively, on
the AAT3783A, the TS pin may be left open.
the maximum power dissipation for a given situation should be
calculated:
Over-Temperature Shutdown
JA = package thermal resistance (°C/W)
The AAT3783A has a thermal protection control circuit, which
shuts down charging functions should the internal die
temperature exceed the preset thermal limit threshold. Once the
internal die temperature falls below the thermal limit, normal
operation resumes the previous charging state.
TJ = thermal loop entering threshold (°C) [115 °C]
PD( MAX ) 
PD(MAX) = maximum power dissipation (W)
TA = ambient temperature (°C)
Figure 26 shows the relationship of maximum power dissipation
and ambient temperature of the AAT3783A.
2.5
PD(MAX) (W)
2
The thermal loop control re-evaluates the circuit die
temperature every three 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
AAT3783A always provides the highest level of constant current
in the fast charge mode possible for any given ambient
temperature condition.
1.5
1
tc167
0.5
0
0
The initial thermal loop current can be estimated by the
following equation:
I TLOOP  I CH _ CC  0.44
 JA
Where:
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 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.
TJ ( MAX )  TA
25
50
75
100
TA (°C)
Figure 26. Maximum Power Dissipation Before
Entering Digital Thermal Loop
Next, the power dissipation can be calculated by the following
equation:
PD  VIN  VBAT   I CH  VIN  I OP 
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
Thermal Considerations
and High Output Current Applications
IOP = quiescent current consumed by the charger ic for normal
operation [0.4 mA]
The AAT3783A delivers a continuous charging current. The
limiting characteristic for maximum safe operating charging
current is its package power dissipation. Many considerations
should be taken into account when designing the printed circuit
board layout, as well as the placement of the IC package in
proximity to other heat generating devices in a given application
design. The ambient temperature around the IC will also have
an effect on the thermal limits of a battery charging application.
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.
The maximum limits that can be expected for a given ambient
condition can be estimated by the following discussion. First,
I CH(MAX) 
PD( MAX )  VIN  I OP
VIN  VBAT
TJ ( MAX )  TA
I CH(MAX) 
 JA
 VIN  I OP
VIN  VBAT
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
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. Figure 27 shows the maximum charge current
in different ambient temperatures.
1000
increased to 10 F or more if the battery connection is made
any distance from the charger output. If the AAT3783A is 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.
TA = 45 °C
TA = 25 °C
ICC_MAX (mA)
800
Printed Circuit Board Layout Recommendations
600
For proper thermal management and to take advantage of the
low RDS(ON) of the AAT3783A, follow these circuit board layout
rules:
400
TA = 60 °C
0
4
4.5
5
tc168
200
TA = 85 °C
5.5
6
6.5
7
7.5
VIN (V)
Figure 27. Maximum Charging Current Before
the Digital Thermal Loop Becomes Active
Input Capacitor
A 1 F or larger capacitor is typically recommended for CIN. CIN
should be located as close to the device VIN pin as practically
possible. Ceramic, tantalum, or aluminum electrolytic
capacitors may be selected for CIN. There is no specific
capacitor equivalent series resistance (ESR) requirement for CIN.
However, for higher current operation, ceramic capacitors are
recommended for CIN due to their inherent capability over
tantalum capacitors to withstand input current surges from low
impedance sources such as batteries in portable devices.
Typically, 50 V rated capacitors are required for most of the
application to prevent any surge voltage. Ceramic capacitors as
small as 1210 are available which can meet these
requirements. Other voltage rating capacitors can also be used
for the known input voltage application.
1. VIN and VOUT should be routed using wider than normal
traces, and GND should be connected to a ground plane.
2. To maximize package thermal dissipation and power
handling capacity of the AAT3783A TDFN package, solder
the exposed paddle of the IC onto the thermal landing of the
PCB, where the thermal landing is connected to the ground
plane.
3. This AAT3783A has two exposed paddles (EP1 and EP2).
EP1 is connected to INCHR (pin 1) and EP2 is connected to
GND (pin 13). DO NOT make one whole thermal landing!
4. If heat is still an issue, multi-layer boards with dedicated
ground planes are recommended.
5. Also, adding more thermal vias on the thermal landing
would help the heat being transferred to the PCB effectively.
Evaluation Board Description
The AAT3783A Evaluation Board is used to test the performance
of the AAT3783A. An Evaluation Board schematic diagram is
provided in Figure 28. Layer details for the Evaluation Board are
shown in Figure 29. The Evaluation Board has additional
components for easy evaluation; the actual bill of materials
required for the system is shown in Table 9.
Charger Input Capacitor
A 2.2 F decoupling capacitor is recommended to be placed
between INCHR and GND.
Charger Output Capacitor
Package Information
Package dimensions for the 16-pin TDFN package are shown in
Figure 30. Tape & reel dimensions are shown in Figure 31.
The AAT3783A only requires a 1 F ceramic capacitor on the
BAT pin to maintain circuit stability. This value should be
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
JP3
INCHR
INCHR
JP1
+5 V
Red LED
D1
Hi Lo
U1
R7, 6 kΩ
4 V ~ 7.5 V
VIN
2
GND
1
R5
(open)
C1
1 μF
JP2
FLT
USBSET
IN
IN
OVP
11
On
R6
(open)
7
5
15
16
6
INCHR
C2
2.2 μF
ENCHR
1 INCHR
13
GND
AAT3783A
Red LED
D2
R3
(open)
Green LED
D3
R8, 1.5kΩ
9
ADPP 8
STAT 2
BATS 3
BAT 4
TS
TERM 12
ISET 14
10
CT
R9, 1.5kΩ
1
2
3
GND
BAT
TS
C3
10 μF
C4
0.1 μF
R2
R4
R1
13.3 kΩ 10 kΩ
1.62 kΩ
tc169
Figure 28. AAT3783A Evaluation Board Schematic
Table 9. AAT3783A Evaluation Board Bill of Materials
Component
Part number
Description
Manufacturer
U1
AAT3783AIRN-T1
1 A Linear Li-Ion/Polymer Battery Charger with 28 V Over-Voltage Protection; TDFN Package
Skyworks
R1
Chip Resistor
1.62 k, 1%, 1/4 W; 0603
Vishay
R2
Chip Resistor
13.3 k, 1%, 1/4 W; 0603
Vishay
R4
Chip Resistor
10 k, 5%, 1/4 W; 0603
Vishay
R7
Chip Resistor
6 k, 5%, 1/4 W; 0603
Vishay
R8, R9
Chip Resistor
1.5 k, 5%, 1/4 W; 0402
Vishay
GRM31MR71H105KA88
CER 1 F, 50 V, 10% X7R 1206
(GRM31CR71H225KA88L)
(CER 2.2 F, 50 V, 10% X7R 1206)
(GRM32ER71H475KA88L)
(CER 4.7 F, 50 V, 10% X7R 1210)
C2
GRM188R61A225KE34
CER 2.2 F, 10 V, 10% X5R 0805
Murata
C3
GRM21BR71A106KE51L
CER 10 F, 10 V, 10% X7R 0805
Murata
C1
Murata
C4
GRM188R71E104KA01
CER 0.1 F, 25 V, 10% X7R 0603
Murata
JP1, JP2, JP3
PRPN401PAEN
Connector, header, 2 mm zip
Sullins Electronics
D1, D2
LTST-C190CKT
Red LED; 0603
Lite-On Inc.
D3
LTST-G190CKT
Green LED; 0603
Lite-On Inc.
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
(a) Top Layer
(b) Middle Layer One
(c) Middle Layer Two
(d) Bottom Layer
tc170
Figure 29. AAT3783A Evaluation Board Layer Details
tc170-1
Figure 30. Magnified View of Exposed Paddles on AAT3783A Evaluation Board Top Layer
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DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
1.600 ± 0.050
0.230 ± 0.050
2.350 ± 0.050
4.000 ± 0.050
Index Area
R0.15 (REF)
Pin 1 ID
0.35 REF
0.700 ± 0.050
3.000 ± 0.050
0.450 ± 0.050
0.25 REF
0.430 ± 0.050
1.600 ± 0.050
Top View
0.750 ± 0.050
Bottom View
0
+ 0.100
-0.000
0.230 ± 0.050
Side View
All measurements are in millimeters.
tc171
Figure 30. AAT3783A 16-pin TDFN Package Dimensions
4.00 ± 0.00
2.00 ± 0.05
Ø1.50 ± 0.10
1.10 ± 0.00
5.50 ± 0.05
12.00 ± 0.30
1.75 ± 0.10
4.40 ± 0.10
8.00 ± 0.10
3.40 ± 0.10
0.30 ± 0.05
Pin 1 Location
All dimensions are in millimeters
t0280
Figure 31. AAT3783A TDFN34-16 Tape and Reel Dimensions
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April 1, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203159A
DATA SHEET • AAT3783A: 1 A LINEAR LI-ION/POLYMER BATTERY CHARGER WITH 28 V OVER-VOLTAGE PROTECTION
Ordering Information
Model Name
AAT3783A: 1 A linear li-ion/polymer battery charger
with 28 V over-voltage protection
Part Marking (Note 1)
5EXYY
Manufacturing Part Number (Note 2)
AAT3783AIRN-4.2
Evaluation Board Part Number
AAT3783AIRN-4.2-EVB
Note 1: XYY = assembly and date code.
Note 2: Sample stock is generally held on part numbers listed in BOLD.
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