Data Sheets - Skyworks Solutions, Inc.

DATA SHEET
AAT3620: Single Cell Li+ Switch Mode Battery Charger
Applications
Description
 Digital camcorders
The BatteryManager™ AAT3620 is an ideal solution for charging
high-capacity Li+ batteries. The AAT3620 can supply up to 2.0 A
charging current with minimal thermal impact to mobile systems
with features such as color display, camera with flash, organizer,
video, etc., that requires battery capacity to keep pace with the
power requirements.
 Point of service (POS)
 Portable DVD players
 Portable hand-held solutions
 Portable media players
Features
 Input voltage range: 4.3 to 6.0 V
 Up to 2.0 A charging current capability
 1.5 MHz PWM/linear charger
 Over 90% full rate charging efficiency
 Integrated switching device
 “No BAT” detect
 Safety timer
 Integrated sense resistor
 Built-in reverse blocking feature
 Battery preconditioning/constant-voltage/constant-current
charging mode
 Programmable end-of-charging current
 1% constant-voltage mode regulation
 Built-in programmable charging timer
 Charging current indication pin
 Over-voltage, over-current, and over-temperature protection
 Battery over-temperature protection
The AAT3620 is a pulse-width modulation (PWM) switch
mode/linear charger with high charging efficiency at the full
constant-current (fast charge) rate. Based on a 1.5 MHz PWM
step-down buck converter, the AAT3620 PWM switch mode
controls the constant-current charging mode up to 2.0 A, and
automatically switches to linear mode charging during the battery
conditioning low level current and the light load end-of-charging
current termination region. The full charging rate and the end-ofcharging current can be programmed with separate external
resistors. A shared charging current indication pin is available for
a Coulomb counter.
Battery charger temperature and charging state are fully
monitored for fault conditions. In the event of an over-current,
over-voltage, short-circuit or over-temperature failure, the device
automatically shuts down. Two status monitor output pins are
provided to indicate the battery charging status and power source
status through two display LEDs. The AAT3620 also has a nobattery detection feature, "No BAT", which requires the safety
timer.
The AAT3620 is available in a thermally enhanced, space-saving
14-pin, 3 mm  3 mm TDFN package.
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.
 Power-on reset and soft-start
 Space-saving TDFN (14-pin, 3 mm  3 mm) package (MSL1,
260 ºC per JEDEC J-STD-020)
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
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1
DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
4.7 μH
CS
VPIN
Adapter
LX
100 Ω
BATT +
VCC
10 μF
0.1 μF
Battery
Pack
BAT
1 μF
22 μF
AAT3620
Charge Enable
EN
BATT PGND
VCC
CT
RT1
0.1 μF
TEMP
TS
RT2
Charging Status 1
STAT 1
Charging Status 2
STAT 2
Charge Current Set
Termination Current Set &
Charge Current Indicator
ISET
GND ITERM
RTERM
RSET
tc93
Figure 1. AAT3620 Typical Application Circuit
VPIN
PGND
GND
VCC
EN
ISET
CT
1
14
2
13
3
12
4
EP
11
5
10
6
9
7
8
LX
CS
BAT
TS
TERM
STAT1
STAT2
t0109
Figure 2. AAT3620 Pinout – 14-Pin, 3 mm  3 mm TDFN
(Top View)
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Table 1. AAT3620 Signal Descriptions
Pin #
Name
Type
Description
1
VPIN
In
Adapter power input.
2
PGND
Ground
Power ground.
3
GND
Ground
Analog ground connection.
4
VCC
In
Supply Input.
5
EN
In
Charging enable input, active high, with internal pull-up (to VPIN).
6
ISET
In
Connect RSET resistor to pin to set constant-current charging current.
7
CT
In/Out
Timer pin. Connect timing capacitor here for charging timer function.
8
STAT2
Out
Battery charging status 2 indicator pin to drive an LED, open-drain.
9
STAT1
Out
Battery charging status 1 indicator pin to drive an LED, open-drain.
10
TERM
In/Out
Connect RTERM resistor to pin to set termination current. Charging current can be monitored with this pin. Leave OPEN to
set to 200 mA default termination current.
11
TS
In/Out
Battery pack temperature sensing input. To disable TS function, pull up to VCC through 10 k resistor.
12
BAT
Out
Battery positive terminal connecting pin.
13
CS
In
Return pin for inductor for internal current sensing.
14
LX
In/Out
Switching node.
Ground
The exposed thermal pad (EP) must be connected to the board ground plane and pins 2 and 3. The ground plane should
include a large exposed copper pad under the package for thermal dissipation (see package outline).
EP
EP
Electrical and Mechanical Specifications
The absolute maximum ratings of the AAT3620 are provided in
Table 2, the thermal information is listed in Table 3, and electrical
specifications are provided in Table 4.
Table 2. AAT3620 Absolute Maximum Ratings (Note 1)
Maximum
Units
VPIN, LX
Parameter
VP
Symbol
Minimum
0.3
Typical
+6.5
V
Other pins
VN
0.3
VP + 0.3
V
Operating junction temperature range
TJ
40
+ 150
ºC
Maximum power dissipation
PD
2.5
W
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. AAT3620 Thermal Information
Value
Units
Maximum thermal resistance (Note 1)
Parameter
JA
Symbol
50
ºC/W
Maximum power dissipation (Note 2)
PD
2
W
Note 1: Mounted on an FR4 board.
Note 2: Derate 2.7 mW/C above 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.
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Table 4. AAT3620 Electrical Specifications (1 of 2) (Note 1)
(VIN = 5.5 V, TA = –25 C to +85C, Unless Otherwise Noted, Typical Values are TA = 25 C)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
6.0
V
4.3
V
Operation
Adapter input voltage
VIN
Input under-voltage lockout
VCC_UVLO
4.3
VPIN rising
3.5
Hysteresis
150
VBAT + 0.05
V
Input sleep voltage
VVIN_SLEEP
No charging if VVIN < VVIN_SLEEP
VBAT + 0.2
mV
Operating supply current
IVIN_OP
EN = high, charging current = 200 mA
5
mA
Standby supply current
IVIN_STBY
EN = high, no charge, power-saving mode
2
mA
Shutdown supply current
IVIN_SHDN
EN = low, LX floating, sleep mode
10
A
Forward leakage current,
measured from LX to ground
IFWD_LKG
EN = low, LX = 5.5 V
1
A
Reverse leakage current, measured
from LX to VIN
IREV_LKG
EN = low or high, VIN = 0 V, LX = 5.5 V
1
A
BAT pin leakage current
IBAT_LKG
VBAT = 4.2 V, VIN = 0 V or open
VIN = 5.5 V
Internal PMOS on resistance
1
A
170
300
m
RDS(ON)
Internal NMOS on resistance
PWM switching frequency
VIN = 5.5 V
fSW
VBAT = 3.6 V, ICH_CC = 1 A
120
250
m
1.2
1.5
1.8
MHz
4.158
4.2
4.242
V
Charging Regulation
Output charging voltage regulation
VBAT_REG
Charging soft-start delay
tSOFT_START
Delay of charging from EN, or VCC_UVLO,
or VVIN_ADPP
Battery conditioning battery voltage
threshold
VBAT_BC
Preconditioning battery charging
when VBAT rising: VBAT < VBAT_BC
Battery conditioning charging
current
ICH_BC
When VBAT < VBAT_BC
Typical battery conditioning
charging current setting range
ICH_BC_TYP
Battery conditioning time- out
tCH_BC
Stop charging if preconditioning time is
more than tCH_BC
15%
Constant-current battery charging
current accuracy
ICH_CC
When VBAT_BC < VBAT < VBAT_REG,
1 A to 2 A
Fast constant-current charging
time out
tCH_CCTO
Constant voltage charging time-out
s
100
2.4
2.6
2.8
0.1  ICH_CC
100
A
200
mA
0.25  CCT
+15%
Minute/nF
15%
ICH_CC
+15
%
Stop charging if fast charging time is
more than tCH_CCFAST
15%
0.022  CCT
+15%
Hour/nF
tCH_CVTO
Stop charging if charging time is
more than tCH_CV
15%
0.03  CCT
+15%
Hour/nF
Battery recharging voltage
threshold
VBAT_RCH
If VBAT falls below VBAT_RCH, recharging
starts
VBAT_REG  0.1
V
Charging termination threshold
current
ICH_TERM_TYP
Terminate CV charging if ICH < ICH_TERM
RTERM  106
A
Typical termination threshold
current setting range
ICH_TERM_RANGE
Charger termination current is clamped to
the minimum or maximum value if set
above or below the ITERM range.
50
200
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V
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mA
DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Table 4. AAT3620 Electrical Specifications (2 of 2) (Note 1)
(VIN = 5.5 V, TA = –25 C to +85C, Unless Otherwise Noted, Typical Values are TA = 25 C)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
Logic and Status Input/Output
EN input high threshold
VIH
EN input low threshold
VIL
1.6
V
0.4
V
EN = VIN
0.1
1
A
EN = 0 V
0.6
10
A
1
A
10
mA
EN pin supply current
IEN
STAT1, STAT2 pin leakage current
ISLEAK
STAT1 and STAT2 pin current sink
capability
ISTATx
STAT pulse width
tSTAT_PULSE
In fault conditions: CCT = 100 nF
0.5
s
STAT pulse frequency
fSTAT_FLASH
In fault conditions: CCT = 100 nF
1
Hz
Battery over-voltage protection threshold
VBAT_OVP
No charging if VBAT > VBAT_OVP
Over-current protection threshold and limit
ICL
TS hot temperature fault
VTS1
When output FET is off
Protection
VBAT_REG + 0.2
Threshold VTS falling
V
2.46
3.0
4.0
A
29.1
30
30.9
% VCC
58.2
60
61.8
% VCC
Hysteresis
50
Threshold VTS rising
mV
TS cold temperature fault threshold
VTS2
50
mV
Thermal shutdown
TSD
140
ºC
Thermal shutdown hysteresis
TSD_HYS
15
ºC
Hysteresis
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Typical Performance Characteristics
2400
2250
2100
2000
Fast Charge Current (mA)
Charging Current (mA)
Typical performance characteristics of the AAT3620 are
illustrated in Figures 3 through 10.
1800
1500
1200
900
–25 °C
25 °C
85 °C
600
300
1750
1500
1250
1000
750
500
250
0
0
2.2
2.5
2.8
3.1
3.4
3.7
4.0
Battery Voltage (V)
Figure 3. Charging Current vs Battery Voltage
4.3
10
30
50
70
90
110
ISET Resistor (kΩ)
Figure 4. Constant-Current Charging Mode Current
vs ISET Resistor (VIN = 5 V, VBAT = 3.5 V)
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
4.080
62
60
End of Charging Voltage (V)
Termination Current (mA)
64
58
56
54
52
50
48
46
44
42
40
4.075
4.070
4.065
4.060
4.055
4.050
-40
-15
10
35
60
-40
85
-15
10
Figure 5. Termination Current vs Temperature
(VIN = 5 V, RTERM = 49.9 k)
3.0
Shutdown Current (μA)
2.63
2.62
2.61
2.60
2.59
2.58
2.57
2.56
-40
2.5
2.0
1.5
1.0
–25 °C
25 °C
85 °C
0.5
0.0
-15
10
35
60
85
4.5
5.0
Temperature (°C)
5.5
6.0
Input Voltage (V)
Figure 7. Preconditioning Rising Threshold Voltage
vs Temperature (VIN = 5.5 V)
Figure 8. Shutdown Current vs Input Voltage
2400
2500
2100
2000
Charge Current (mA)
1800
1500
1200
900
VBAT = 2.7 V
VBAT = 3.3 V
VBAT = 3.6 V
VBAT = 3.9 V
600
300
0
4.0
1500
1000
VBAT = 2.7 V
VBAT = 3.3 V
VBAT = 3.6 V
VBAT = 3.9 V
500
0
4.2
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
6.0
Input Voltage (V)
Figure 9. Charging Current vs Input Voltage (T = 25 °C)
4.0
4.5
5.0
5.5
6.0
6.5
Input Voltage (V)
Figure 10. Charging Current vs Input Voltage (T = 85 °C)
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85
Figure 6. Recharging Voltage vs Temperature
(VIN = 5 V)
2.64
Preconditioning Rising
Threshold Voltage (V)
60
Temperature (°C)
Temperature (°C)
Battery Charging Current (mA)
35
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
PGND
Reverse Blocking
VPIN
LX
Reverse Blocking
CS
VCC
Volt Det /
UVLO
BAT
EN
PWM / Linear Charge Control
GND
VREF
TS
Over-Temperature
Protection
ISET
TERM
CT
Charge
status
STAT1
Current
Set
STAT2
Timer
t0119
Figure 11. AAT3620 Functional Block Diagram
Functional Description
Linear Charging
Control Loop
Linear charging current relationship:
The AAT3620 uses an average current mode step-down
converter to implement the DC-DC switch-mode converter
function during constant-current mode charging. The technique
of average current mode control overcomes peak current
control problems by introducing a high gain integrating current
error amplifier into the current loop. Average current tracks the
sensed output current with a high degree of accuracy and
excellent noise immunity. The oscillator sawtooth ramp provides
compensation so no slope compensation is required for duty
cycle exceeding 50%. The high gain of the current error
amplifier at DC accurately programs the output. The switching
charger works in continuous current mode PWM only. There is a
soft start before entering constant-current charging mode and
the charger re-enters linear operation in constant voltage mode
when the charging current drops below 300 mA.
A functional block diagram is shown in Figure 11.
Linear vs Switching Battery Charging
The AAT3620 performs battery charging using the benefits of
the step-down or buck architecture to multiply the input current
when stepping down the output voltage. This property
maximizes battery charging from current limited devices and
greatly decreases power and heat-related dissipation. The
process is expressed mathematically in the following
comparison:
I BATL  I IN
Efficiency of linear charger:

VBAT
VIN
Switch-Mode Charging
Switch-mode current relationship:
I BATS 
 S  VIN  I IN
VBAT
Where: s = 90%.
Example: Power Savings
Conventional linear charger IC:
PD  VIN  VBAT   I BAT  5  3.5   0.5  0.75W
Switch-mode charger IC:
PD 
V BAT  I BAT

V BAT  I BAT 
3.5  0.5
 3.5  0.5   0.194W
0.9
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Adapter Input Charging Inhibit and Resume
The AAT3620 checks the condition of the battery and
determines which charging mode to apply. If the battery voltage
is below VBAT_BC, the AAT3620 begins battery conditioning until
the battery voltage reaches VBAT_BC. The battery conditioning
current is 10% of constant-current level. Once the AAT3620
reaches VBAT_BC, it begins constant-current mode charging. The
constant-current mode current level is programmed using a
single resistor from the ISET pin to ground. Programmed current
can be set from a minimum of 1 A to a maximum of 2 A.
Constant-current charging continues until the battery voltage
reaches the voltage regulation point VBAT_REG. When the battery
voltage reaches VBAT_REG, the AAT3620 transitions to constantvoltage mode. The regulation voltage is factory programmed to
a nominal 4.2 V and continues charging until the charging
current is reduced to the termination current programmed by
the resistor connected from ITERM to ground. The termination
current program range is 50 to 200 mA.
The AAT3620 has a UVLO and power-on reset feature so that if
the input supply to the ADP pin drops below the UVLO threshold,
the charger suspends charging and shuts down. When power is
re-applied to the IN pin or the UVLO condition recovers, the
system charging control assesses the state of charging on the
battery cell and automatically resumes charging in the
appropriate mode for the condition of the battery.
Input/Output Capacitor and Inductor
The AAT3620 contains a high-performance 2 A, 1.5 MHz
synchronous step-down converter. The step-down converter
operates to ensure high efficiency performance over all load
conditions. It requires only 3 external power components (CIN,
COUT, and L).
Apart from the input capacitor, only a small L-C filter is required
at the output side for the step-down converter to operate
properly. Typically, a 4.7 H inductor such as the Wurth
7447789004 and a 22 F to 47 F ceramic output capacitor is
recommended for low output voltage ripple and small
component size. Ceramic capacitors with X5R or X7R dielectrics
are highly recommended because of their low ESR and small
temperature coefficients. A 10 F ceramic input capacitor is
sufficient for most applications.
After the charging cycle is complete, the AAT3620, turns off the
series pass device and automatically goes into a power saving
mode. During this time, the series pass device blocks current in
both directions, preventing the battery from discharging through
the IC.
The AAT3620 shuts down if the charger source is disconnected
until the charging source is reconnected and VIN is greater than
the VIN_SLEEP threshold.
Battery Charging
Figure 12 illustrates the entire battery charging profile, which
consists of three phases:
Battery charging starts only after the AAT3620 checks several
conditions to maintain a safe charging environment. The input
supply must be above the minimum operating voltage (UVLO)
and above the battery voltage by 0.3 V, the battery temperature
must be within the 0 °C ~ 45 °C range, and the enable pin must
be high.
V
Charging Complete
Regulated Voltage
4.2
Preconditioning
Trickle
Constant-Current
Charging
Fast Charging Phase
Phase
1
1. Preconditioning-current mode (trickle) charging
2. Constant-current mode charging
3. Constant-voltage mode charging
Constant-Voltage
Taper Charging Phase
3
2
Constant-Current
I
Charging Phase
Constant-Voltage
Battery Discharging
Taper Charging Phase
Battery Recharging
Voltage Threshold
3
2
Regulated
Current
1C
Constant-Current
Mode Voltage
Threshold
2.6
300 mA
Trickle Charging and
Termination Threshold
(Programmable)
L
S
L
S
L
Time
The profile consists of three phases:
1. Preconditioning-Current Mode (Trickle) Charging - Linear Mode
2. Constant-Current (Fast) Mode Charging - Switching Mode
3. Constant-Voltage Mode (Taper) Charging - Switching/Linear Mode.
Figure 12. Charging Current and Battery Voltage vs Time
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t0220
DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
The battery preconditioning current is equal to 10% of the
constant-current charging level, so the battery preconditioning
current range is 100 to 200 mA. Linear mode is on standby
while switch-mode is active in the constant-current charging
region 2.6 V < VBAT < 4.2 V. The charger re-enters linear mode
while in constant voltage mode after the switch-mode current
drops below 300 mA. The termination current is programmed
by an external resistor with a separate ITERM pin and the
termination current set pin also monitors the charging current.
The output short circuit current is equal to the battery
preconditioning current.
Preconditioning Trickle Charge
Battery charging starts only after the AAT3620 battery charger
checks several conditions in order to maintain a safe charging
environment. The system operation flow chart for the battery
charger operation is shown in Figure 13. The input supply must
be above the minimum operating voltage (UVLO) and the enable
pin (EN) must be high (it is internally pulled up). When the
battery is connected to the BAT pin, the battery charger checks
the condition of the battery and determines which charging
mode to apply.
Preconditioning – Current Mode Charging Current
If the battery voltage is below the preconditioning voltage
threshold VCH_BC, the battery charger initiates precondition
trickle charging mode and charges the battery at 10% of the
programmed constant-current magnitude. For example, if the
programmed current is 1 A, the trickle charging current would
be 100 mA. Trickle charging is a safety precaution for a deeply
discharged cell. It also reduces the power dissipation in the
internal series pass MOSFET when the input-output voltage
differential is at its highest.
Constant – Current Mode Charging Current
Trickle charging continues until the battery voltage reaches
VBAT_BC. At this point the battery charger begins constantcurrent charging. The current level default for this mode is
programmed using a resistor from the ISET pin to ground.
Programmed current can be set at a minimum of 100 mA and
up to a maximum of 2.0 A.
The AAT3620 contains a high performance 2 A, 1.5 MHz
synchronous step-down converter. The step-down converter
operates to ensure high efficiency performance over all load
conditions. It requires only 3 external power components (CIN,
COUT, and L).
Constant – Voltage Mode Charging
Constant-current charging continues until the battery voltage
reaches the output charging voltage regulation point VBAT_REG.
When the battery voltage reaches VBAT_REG, the battery charger
transitions to constant-voltage mode. VBAT_REG is factory
programmed to 4.2 V (nominal). Charging in constant-voltage
mode continues until the charging current is reduced to the
programmed end-of-charging termination current.
Power-Save Mode
After the charging cycle is complete, the battery charger turns
off the series pass device and automatically goes into powersave mode. During this time, the series pass device blocks
current in both directions to prevent the battery from
discharging through the battery charger. In power-save mode,
the battery charger monitors all parameters and resumes
charging in the most appropriate mode.
Sleep Mode
The battery charger shuts down if the charger source is
disconnected and VIN is less than VIN_SLEEP threshold. It comes
out of sleep mode if either VIN is greater than VIN_SLEEP or EN
pin is cycled high while VIN is greater than VIN_SLEEP.
Programming Charging Current (ISET)
The default constant-current mode charging level is userprogrammed with a set resistor placed between the ISET pin
and ground. The accuracy of the constant charging current, as
well as the preconditioning trickle charging current, is
dominated by the tolerance of the set resistor. For this reason, a
1% tolerance metal film resistor is recommended for the set
resistor function. The constant charging current levels from 1 to
2 A can be set by selecting the appropriate resistor value from
Table 5.
Table 5. ISET Resistor vs Constant-Current Mode Current
RSET (k)
ICH_CC (mA)
100
2000
90
1800
80
1600
70
1400
60
1200
50
1000
40
800
30
600
20
400
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Enable
No
Power On Reset
Yes
No
Power
Input Voltage
VCC > VCC_UVLO
Expired
Yes
Yes
Shut Down
Fault
Conditions Monitoring
OV, OT,
VTS1<TS<VTS2
Charging Timer
Control
No
Preconditioning
Test
Yes
Preconditioning
(Trickle Charge)
VBAT<VBAT_BC
VBAT > VBAT_BC
No
No
Recharging Test
VBAT_RCH > VBAT
Yes
Current Phase Test
VBAT<VBAT_REG
Yes
Constant Current
Charging Mode
VBAT > VBAT_REG
No
Voltage Phase Test
IBAT>ICH_TERM
Yes
Constant Voltage
Charging Mode
IBAT < ICH_TERM
No
Charging Completed
t0221
Figure 13. System Operation Flowchart for the Battery Charger
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Programmable Charging Termination Current
The charging termination current ICH_TERM can be programmed
by connecting a resistor from TERM to GND:
I CH_TERM  RTERM  10 6
If the TERM pin is left open, the termination current level is set
to 200 mA as the default.
When the charging current drops to the termination current
level, the device terminates charging and goes into a powersave mode. The charger remains in this mode until the battery
voltage decreases to a level below the battery recharging
voltage threshold (VBAT_RCH).
Consuming very low current in the power-save mode, the
AAT3620 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. If the AAT3620
input voltage drops, the device enters sleep mode and
automatically resumes charging once the input supply has
recovered from the fault condition.
The TERM pin can also be used as a charging current monitor
when the charging current voltage level = 1 A/V.
Status Indicator (STAT1/STAT2)
Charging Status Output
The AAT3620 provides battery charger status using two status
pins (STAT1 and STAT2). Each of the two pins is internally
connected to an N-channel open-drain MOSFET. The status pin
can indicate the conditions shown in Table 6.
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 pins.
LED current consumption adds to the overall thermal power
budget for the device package, so keeping the LED drive current
to a minimum is recommended – 2 mA should be sufficient to
drive most low-cost green or red LEDs. Do not exceed 8 mA for
driving an individual status LED. The required ballast resistor
values can be estimated using the following equation:
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
Charging Safety Timer (CT)
While monitoring the charging cycle, the AAT3620 utilizes a
charging safety timer to help identify damaged cells and to
ensure that the cell is charged safely:
 Upon initiating a charging cycle, the AAT3620 charges the cell
at 10% of the programmed maximum charging until VBAT >
2.6 V.
 If the cell voltage fails to reach the precondition threshold of
2.6 V (typical) before the safety timer expires, the cell is
assumed to be damaged and the charging cycle terminates.
 If the cell voltage exceeds 2.6 V prior to the expiration of the
timer, the charging cycle proceeds into fast charging.
There are three time-out periods, as shown in Table 7.
Table 6. LED Status Indicator STAT1 and STAT2
Conditions
STAT1
STAT2
ON
ON
Fast-charging
ON
OFF
End-of-charging (charging complete)
OFF
ON
Charging disabled
OFF
OFF
Pre-charging
Sleep mode (VIN < VIN_SLEEP)
OFF
OFF
FLASH, 50% duty cycle
FLASH, 50% duty cycle
Fault condition (battery 0 V)
OFF
OFF
Fault condition
[battery OT (over-temperature) / UT (under-temperature)]
OFF
OFF
Fault condition (device OT)
OFF
OFF
Fault (pre-charging time out)
OFF
FLASH, 50% duty cycle
Fault (time out)
OFF
OFF
No battery with charging enabled
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Table 7. Summary for a 0.1 F Ceramic Capacitor Used for the
Timing Capacitor
Mode
Time
Trickle charging (TC) time-out
25 minutes
Trickle charging (TC) + constant-current (CC) mode
time-out
2.2 hours
Constant-voltage (CV) mode time-out
3 hours
The AAT3620 has a battery fault detector, which, when used in
conjunction with a 0.1 F capacitor on the CT pin, outputs a
1 Hz signal with 50% duty cycle at the STAT2 pin in the event of
a time-out while in trickle charging mode.
The CT pin is driven by a constant-current source and provides
a linear response to increase the timing capacitor value. Thus, if
the timing capacitor is doubled from the nominal
0.1 F value, the time-out periods are doubled.
The CT pin should not be left floating or unterminated, as this
would cause errors in the internal timing control circuit. The
constant-current provided to charge the timing capacitor is very
small, so 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. Because the accuracy of the internal
timer is dominated by the capacitance value, a ceramic
capacitor with 10% tolerance or better is recommended. The
X7R and X5R types of ceramic capacitors are good choices for
this application.
The AAT3620 has the no-battery detection function, "No-BAT".
The CT pin capacitor (CCT) sets up an internal clock to reset the
no battery detector every 8 clock periods. The internal clock
frequency is inversely proportional to the CCT:
f 
100 nF  Hz
CCT
The no-battery detection function detects when the charger
toggles between charging termination and the recharging
threshold in less than 8 clock periods. If this occurs for four
consecutive times, the battery is considered disconnected.
Requiring four consecutive "No BAT" cycles prevents a false
indication when the battery connection is bounced. If the battery
is disconnected while powered on, the recommended 0.1 F
capacitor at CT pin creates a 1 Hz internal clock to make the
STAT LED blink at 1 Hz, 50% duty cycle, to indicate “no battery
connected.”
To ensure that the charger cycles between charging termination
and recharging in less than 8 clock periods, the BAT pin
capacitor cannot exceed 22 F for every 100 nF on the CT pin.
For example, if CCT is 220 nF, the capacitor on the BAT pin
cannot exceed 47 F. If more capacitance is used on the BAT
pin, it takes longer than 8 clock periods to complete a charge
termination/recharging cycle and the no-battery detection does
not work.
Note that disabling the safety timer (CT pin grounded) on the
AAT3620 leads to a false "No BAT" detection, and both STAT
pins go low after four consecutive charge termination/recharge
cycles.
Over-Voltage Protection
An over-voltage event is defined as a condition where the
voltage on the BAT pin exceeds the maximum battery charging
voltage and is set by the over-voltage protection threshold
(VBAT_OVP). If an over-voltage condition occurs, the AAT3620
charging control shuts down the device until the voltage on the
BAT pin drops below VBAT_OVP. The AAT3620 resumes normal
charging operation after the over-voltage condition is removed.
During an over-voltage event, the STAT LEDs report a system
fault.
Over-Temperature Shutdown
The AAT3620 has a thermal protection control circuit which
shuts down charging functions if the internal die temperature
exceeds the preset thermal limit threshold. When the internal
die temperature falls back below the thermal limit, normal
operation resumes the previous charging state.
Battery Temperature Fault Monitoring (TS)
In the event of a battery over-temperature condition, the
charging control turns off the internal pass device and reports a
battery temperature fault on the STAT pins. After the system
recovers from a temperature fault, the device resumes charging
operation. The AAT3620 checks battery temperature before
starting the charging cycle, as well as during all stages of
charging. This is accomplished by monitoring the voltage at the
TS pin. The internal battery temperature sensing system (Figure
14) is comprised of two comparators that establish a voltage
window for safe operation. The thresholds for the TS operating
window are bounded by the VTS1 and VTS2 specifications. Refer
to the electrical characteristics in Table 4: VTS1 threshold =
0.30  VCC and the VTS2 threshold = 0.60  VCC.
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). If the battery gets too hot during charging
due to an internal fault or excessive constant charging current,
the thermistor heats up and reduces in value, pulling the TS pin
voltage lower than the TS1 threshold, and the AAT3620 stops
charging until the condition is removed, when charging is
resumed.
To accurately set the TS voltage according to the temperature
coefficient and the nominal value of the thermistor, two
resistors can be used as shown in the example below. It is
recommended to use NTC thermistors in the 10 k to 100 k
range, with Beta constant values in the 3000 to 5000 range.
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER


1
1

RNTC ( HOT )  RNTC ( COLD )  

 Ratio Cold Ratio Hot 


 
RT2 




1
1
 1   RNTC ( COLD )  
 1
RNTC ( HOT )  
 Ratio Hot

 Ratio Cold





 1  Ratio Cold RT 2  R NTC ( COLD )
RT1  

 Ratio Cold
RT 2  R NTC ( COLD )


 


Where:
Ratio Cold = 0.60 (2% tolerance)
The AAT3620 is offered in a TDFN33-14 package which can
provide up to 2 W of power dissipation when properly bonded to
a printed circuit board. The maximum thermal resistance is
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 considerations:
1. The maximum power dissipation for a given situation
should be calculated:
Ratio Hot = 0.30 (2% tolerance)
RNTC(COLD) = Thermistor resistance at Cold (typically 0 °C)
p D(MAX) 
RNTC(HOT) = Thermistor resistance at Hot (typically 45 °C)
For a 10 k NTC thermistor with a Beta of 3370:
TJ ( MAX )  TA
 JA
RNTC(0C) = 28.1 k
Where:
RNTC(45C) = 4.91 k
PD(MAX) = maximum power dissipation (W)
The calculation results are as follows:
JA = package thermal resistance (°C/W)
RT2 = 31.6 k
TJ(MAX) = maximum device thermal shutdown temperature
(°C) [140 °C]
RT1 = 9.92 k
If the use of the TS pin function is not required by the system, it
should be tied to VCC using a 10 k resistor.
TA = ambient temperature (°C)
2. The power dissipation for both the linear charging mode
and the switching charger mode should be
considered.
VCC
The power dissipation for the switching charger can
be calculated by the following equation:
VCC
0.6 VCC
RT1
p D(MAX) 

VPIN
Battery Cold Fault
TS
RT2

2
I CH
_ CC  RDS ( ON ) HS  VBAT  RDS ( ON ) LS  VPIN  VBAT 
 t SW  f SW  I CH _ CC  I QOP   VPIN
Battery
Pack
Battery Hot Fault
RNTC
Where:
PD(MAX) = total power dissipation by the device
0.3 VCC
VPIN = adapter input voltage
VBAT = battery voltage at the BAT pin
t0221
Figure 14. AAT3620 Battery Temperature Sense Circuit
Thermal Considerations
The actual maximum charging current is a function of Charging
Adapter input voltage, the state of the battery charging at the
moment of charging, the system supply current from the BAT
pin, the ambient temperature and the thermal impedance of the
package. The maximum programmable current may not be
achievable under all operating parameters.
ICH_CC = constant charging current programmed for the
application
IQOP = quiescent current consumed by the IC for normal
operation [5 mA]
RDS(ON)HS and RDS(ON)LS = on-resistance of step-down high
and low side MOSFETs
3. The power dissipation for the linear charging mode can
be calculated by the following equation:
p D(MAX)  VPIN  VBAT   I CH _ BC  VPIN  I QOP
Where:
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
PD(MAX) = total power dissipation by the device
For the linear mode:
VPIN = input voltage
IQOP = 0.005 A
VPIN = 6 V
VBAT = 2 V
ICH_BC = 0.2 A
VBAT = battery voltage as seen at the BAT pin
ICH_BC = battery conditioning charging current
programmed for the application
IQOP = quiescent current consumed by the charger IC for
normal operation [5 mA].
By substitution, the maximum charging current before
reaching the thermal limit condition (thermal loop) can be
derived. The maximum charging current is the key factor
when designing battery charger applications:
I CH_BC(MAX) 
PD( MAX )  VPIN  I QOP
VPIN  VBAT
TJ  T A
I CH(MAX) 
 JA
 VPIN  I QOP
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 entering ConstantCurrent (CC) switching charging mode.
Example Worst-Case Power Dissipation
The worst-case power dissipation can be calculated using the
lowest battery voltage level when the charger enters CC
charging mode and the charging current is set to 2 A:
ICH_CC = 2 A
VPIN =6 V
RDS(ON)HS = 0.3 
RDS(ON)LS = 0.25 
tSW = 5  10-9
IQOP = 0.005 A
fSW = 1.5  106
TA = 85 °C
JA = 50 °C/W
p D(MAX) 
PCB Layout Guidance
When laying out the PC board, follow the guidelines below to
ensure proper operation of the AAT3620:
 Solder the exposed pad EP reliably to PGND/AGND and
multilayer GND. Connect the exposed thermal pad to board
ground plane and pins 2 and 3. Include a large exposed
copper pad under the package in the ground plane with vias
to all board layers for thermal dissipation.
 Keep the power traces, including GND traces, the LX traces
and the VIN trace short, direct and wide to allow large current
flow. Make the L1 connection to the LX and CS pins as short
as possible. Use several via pads when routing between
layers.
 Connect the input capacitors (C1, C4, and C5) as close as
possible to VPIN (pin 1), VCC (pin 4) and GND/PGND (pins 2, 3)
to get good power filtering. It is recommended to add a
resistor R7 between VIN and VCC to create a low-pass RC
filter on VCC.
 Keep the resistance of the trace from the load return to the
PGND (pin 2) to a minimum. This helps to minimize any error
in DC regulation due to differences in the potential of the
internal signal ground and the power ground.
6V

p D(MAX)  0.83W
 Connect the output capacitors C2, C6 and C7 and inductor L1
as close as possible, and do not route any signal lines under
the inductor.
2 A2  0.3  2.8V  0.25  6V  2.8V 
 5  10
p D(MAX)  6V  2V   0.2 A  6V  0.005 A
9
  1.5  10   2 A  0.005 A 6V
p D(MAX)  1.213W
TJ(MAX)  85  50  1.213( C )
6
Evaluation Board Description
The AAT3620 Evaluation Board is used to test the performance
of the AAT3620. An Evaluation Board schematic diagram is
provided in Figure 15. Layer details for the Evaluation Board are
shown in Figure 16. The Evaluation Board has additional
components for easy evaluation; the actual bill of materials
required for the system is shown in Table 8.
TJ(MAX)  145.65( C )
Package Information
Package dimensions for the 14-pin TDFN33 package are shown
in Figure 17. Tape and reel dimensions are shown in Figure 18.
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
C5
1 μF
C1
0.1 μF
TP5
CS
C6
0.1 μF
TB2
GND
VIN
TP2
100 Ω
R7
VCC
TP1
U1
AAT3620-TDFN33-14
1
VIN
C4
10 μF
2
3
TP3
4
JP1
GND
5
R4
EN
6
100 kΩ
L1
4.7 μH
7
VPIN
LX
PGND
CS
GND
BAT
VCC
TS
EN
TERM
ISET
STAT1
CT
STAT2
EP
VCC
TP4
14
TP8
R1
10 kΩ
BAT
LX
13
TB1
12
C7
11
10
9
8
C3
0.1 μF
BAT
GND
TS
C2
0.1 μF 22 μF
R3
49.9 kΩ
R5
2 kΩ D1
R6
2 kΩ
TS
VIN
STAT1
D2
JP2
TS
TP7
R2
10 kΩ
TP6
GND
STAT2
tc94
Figure 15. AAT3620 Evaluation Board Schematic
Table 8. AAT3620 Evaluation Board Bill of Materials
Component
Description
Value
Footprint
C4
Capacitor, Ceramic, X5R, 10 V, ±20%
10 F
0805
C1, C3, C6, C7
Capacitor, Ceramic, 20%, 10 V, X5R
0.1 F
0603
C2
Capacitor, Ceramic, 20%, 10 V, X5R
22 F
1206
C5
Capacitor, Ceramic, 20%, 10 V, X5R
1 F
0603
L1
Inductor, Wurth, 7447789004
4.7 H
7 mm  7 mm
R1, R2
Resistor, 5%
10 k
0402
R5, R6
Resistor, 5%
2 k
0402
R3
Resistor, 1%
49.9 k
0402
R4
Resistor, 1%
100 k
0402
R7
Resistor, 1%
100 
0402
D1, D2
Red and green SMD
(a) Top Layer
0402
(b) Bottom Layer
tc95
Figure 16. AAT3620 Evaluation Board Layer Details
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Detail "A"
3.000 ± 0.050
2.500 ± 0.050
Index Area
1.650 ± 0.050
3.000 ± 0.050
Top View
Bottom View
+ 0.100
- 0.000
0.400 BSC
0.000
0.203 REF
0.750 ± 0.050
0.425 ± 0.050
Pin 1 Indicator
(Optional)
0.180 ± 0.050
Side View
Detail "A"
All dimensions are in millimeters.
t0060
Figure 17. AAT3620 14-pin TDFN Package Dimensions
4.00 ± 0.00
1.75 ± 0.10
2.00 ± 0.05
5.50 ± 0.05
1.50 ± 0.10
12.00 ± 0.30
1.10 ± 0.00
3.30 ± 0.10
Pin 1 Location
0.30 ± 0.05
3.30 ± 0.10
8.00 ± 0.10
All dimensions are in millimeters
t0059
Figure 18. AAT3620 Tape and Reel Dimensions
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Ordering Information
Model Name
AAT3620 Single Cell Li+ Switch Mode Battery Charger
Part Marking (Note 2)
6WXYY
Manufacturing Part Number (Note 1)
AAT3620IWO-4.2-T1
Evaluation Board Part Number
AAT3620IWO-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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