AAT3620IWO-4.2-T1 [SKYWORKS]
Power Supply Management Circuit, PDSO14,;
| 型号： | AAT3620IWO-4.2-T1 |
| 厂家： | 
SKYWORKS SOLUTIONS INC. |
| 描述： | Power Supply Management Circuit, PDSO14, 光电二极管 |
| 文件： | 总17页 (文件大小：943K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
AAT3620: Single Cell Li+ Switch Mode Battery Charger
Applications
Description
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.
Digital camcorders
Point of service (POS)
Portable DVD players
Portable hand-held solutions
Portable media players
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-of-
charging current can be programmed with separate external
resistors. A shared charging current indication pin is available for
a Coulomb counter.
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
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 no-
battery detection feature, "No BAT", which requires the 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
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.
Over-voltage, over-current, and over-temperature protection
Battery over-temperature protection
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
LX
VPIN
Adapter
100 Ω
Battery
Pack
+
BATT
VCC
BAT
0.1 μF
1 μF
10 μF
22 μF
AAT3620
Charge Enable
EN
BATT -
TEMP
PGND
CT
VCC
RT1
0.1 μF
TS
RT2
STAT
1
2
Charging Status 1
Charging Status 2
ISET
Charge Current Set
Termination Current Set &
Charge Current Indicator
STAT
ITERM
GND
RSET
R
TERM
tc93
Figure 1. AAT3620 Typical Application Circuit
14
13
12
11
10
9
1
2
3
4
5
6
7
VPIN
PGND
GND
VCC
EN
LX
CS
BAT
TS
TERM
STAT1
STAT2
EP
ISET
CT
8
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
VPIN
Type
Description
1
2
3
4
5
6
7
8
9
In
Adapter power input.
Power ground.
PGND
GND
VCC
Ground
Ground
In
Analog ground connection.
Supply Input.
EN
In
Charging enable input, active high, with internal pull-up (to VPIN).
Connect RSET resistor to pin to set constant-current charging current.
Timer pin. Connect timing capacitor here for charging timer function.
Battery charging status 2 indicator pin to drive an LED, open-drain.
Battery charging status 1 indicator pin to drive an LED, open-drain.
ISET
CT
In
In/Out
Out
STAT2
STAT1
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.
10
TERM
In/Out
11
12
13
14
TS
In/Out
Out
Battery pack temperature sensing input. To disable TS function, pull up to VCC through 10 k resistor.
Battery positive terminal connecting pin.
BAT
CS
LX
In
Return pin for inductor for internal current sensing.
Switching node.
In/Out
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
Ground
Table 2, the thermal information is listed in Table 3, and electrical
specifications are provided in Table 4.
Electrical and Mechanical Specifications
The absolute maximum ratings of the AAT3620 are provided in
Table 2. AAT3620 Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Minimum
0.3
Typical
Maximum
+6.5
Units
V
VPIN, LX
VP
Other pins
VN
0.3
VP + 0.3
+ 150
V
Operating junction temperature range
Maximum power dissipation
TJ
40
ºC
W
PD
2.5
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
Parameter
Maximum thermal resistance (Note 1)
Maximum power dissipation (Note 2)
Symbol
Value
50
Units
ºC/W
W
JA
PD
2
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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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 +85C, Unless Otherwise Noted, Typical Values are TA = 25 C)
Parameter
Symbol
Test Condition
Min
Typical
Max
Units
Operation
Adapter input voltage
VIN
4.3
3.5
6.0
4.3
V
V
VPIN rising
Hysteresis
Input under-voltage lockout
VCC_UVLO
150
V
Input sleep voltage
VVIN_SLEEP
IVIN_OP
No charging if VVIN < VVIN_SLEEP
VBAT + 0.05
VBAT + 0.2
mV
mA
mA
A
Operating supply current
Standby supply current
Shutdown supply current
EN = high, charging current = 200 mA
EN = high, no charge, power-saving mode
EN = low, LX floating, sleep mode
5
2
IVIN_STBY
IVIN_SHDN
10
Forward leakage current,
measured from LX to ground
IFWD_LKG
EN = low, LX = 5.5 V
1
1
A
A
Reverse leakage current, measured
from LX to VIN
IREV_LKG
IBAT_LKG
EN = low or high, VIN = 0 V, LX = 5.5 V
BAT pin leakage current
VBAT = 4.2 V, VIN = 0 V or open
VIN = 5.5 V
1
A
Internal PMOS on resistance
Internal NMOS on resistance
PWM switching frequency
170
120
1.5
300
250
1.8
m
m
MHz
RDS(ON)
fSW
VIN = 5.5 V
VBAT = 3.6 V, ICH_CC = 1 A
1.2
Charging Regulation
Output charging voltage regulation
VBAT_REG
4.158
4.2
4.242
2.8
V
Delay of charging from EN, or VCC_UVLO,
or VVIN_ADPP
Charging soft-start delay
tSOFT_START
100
s
Battery conditioning battery voltage
threshold
Preconditioning battery charging
when VBAT rising: VBAT < VBAT_BC
VBAT_BC
ICH_BC
2.4
2.6
V
Battery conditioning charging
current
When VBAT < VBAT_BC
0.1 ICH_CC
A
mA
Typical battery conditioning
charging current setting range
ICH_BC_TYP
tCH_BC
100
200
Stop charging if preconditioning time is
more than tCH_BC
Battery conditioning time- out
15%
15%
15%
15%
0.25 CCT
ICH_CC
+15%
+15
Minute/nF
%
Constant-current battery charging
current accuracy
When VBAT_BC < VBAT < VBAT_REG,
1 A to 2 A
ICH_CC
Fast constant-current charging
time out
Stop charging if fast charging time is
more than tCH_CCFAST
tCH_CCTO
tCH_CVTO
VBAT_RCH
ICH_TERM_TYP
0.022 CCT
0.03 CCT
VBAT_REG 0.1
+15%
+15%
Hour/nF
Hour/nF
V
Stop charging if charging time is
more than tCH_CV
Constant voltage charging time-out
Battery recharging voltage
threshold
If VBAT falls below VBAT_RCH, recharging
starts
Charging termination threshold
current
RTERM 10
A
6
Terminate CV charging if ICH < ICH_TERM
Charger termination current is clamped to
the minimum or maximum value if set
above or below the ITERM range.
Typical termination threshold
current setting range
ICH_TERM_RANGE
50
200
mA
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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 +85C, 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
1.6
V
EN input low threshold
VIL
0.4
1
V
EN = VIN
EN = 0 V
0.1
0.6
A
A
A
EN pin supply current
IEN
10
1
STAT1, STAT2 pin leakage current
ISLEAK
ISTATx
When output FET is off
STAT1 and STAT2 pin current sink
capability
10
mA
STAT pulse width
tSTAT_PULSE
fSTAT_FLASH
In fault conditions: CCT = 100 nF
In fault conditions: CCT = 100 nF
0.5
1
s
STAT pulse frequency
Hz
Protection
Battery over-voltage protection threshold
Over-current protection threshold and limit
VBAT_OVP
ICL
No charging if VBAT > VBAT_OVP
VBAT_REG + 0.2
V
A
2.46
29.1
3.0
30
4.0
Threshold VTS falling
Hysteresis
30.9
% VCC
mV
TS hot temperature fault
VTS1
VTS2
50
Threshold VTS rising
Hysteresis
58.2
60
61.8
% VCC
mV
TS cold temperature fault threshold
50
Thermal shutdown
TSD
140
15
ºC
Thermal shutdown hysteresis
TSD_HYS
ºC
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Typical Performance Characteristics
Typical performance characteristics of the AAT3620 are
illustrated in Figures 3 through 10.
2250
2000
1750
1500
1250
1000
750
2400
2100
1800
1500
1200
900
–25 °C
25 °C
85 °C
600
300
0
500
250
0
10
30
50
70
90
110
2.2
2.5
2.8
3.1
3.4
3.7
4.0
4.3
ISET Resistor (kΩ)
Battery Voltage (V)
Figure 4. Constant-Current Charging Mode Current
vs ISET Resistor (VIN = 5 V, VBAT = 3.5 V)
Figure 3. Charging Current vs Battery Voltage
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
64
62
60
58
56
54
52
50
48
46
44
42
40
4.080
4.075
4.070
4.065
4.060
4.055
4.050
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature (°C)
Temperature (°C)
Figure 5. Termination Current vs Temperature
Figure 6. Recharging Voltage vs Temperature
(VIN = 5 V)
(VIN = 5 V, RTERM = 49.9 k)
2.64
2.63
2.62
2.61
2.60
2.59
2.58
2.57
2.56
3.0
2.5
2.0
1.5
1.0
0.5
0.0
–25 °C
25 °C
85 °C
-40
-15
10
35
60
85
4.5
5.0
5.5
6.0
Temperature (°C)
Input Voltage (V)
Figure 7. Preconditioning Rising Threshold Voltage
vs Temperature (VIN = 5.5 V)
Figure 8. Shutdown Current vs Input Voltage
2400
2100
1800
1500
1200
900
2500
2000
1500
1000
500
0
VBAT = 2.7 V
VBAT = 3.3 V
VBAT = 3.6 V
VBAT = 3.9 V
V
V
V
V
BAT = 2.7 V
BAT = 3.3 V
BAT = 3.6 V
BAT = 3.9 V
600
300
0
4.0
4.5
5.0
5.5
6.0
6.5
4.0
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)
Input Voltage (V)
Figure 10. Charging Current vs Input Voltage (T = 85 °C)
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
PGND
LX
Reverse Blocking
VPIN
Reverse Blocking
CS
Volt Det/
UVLO
VCC
BAT
EN
PWM / Linear Charge Control
GND
VREF
TS
Over-Temperature
Protection
Charge
status
STAT1
STAT2
ISET
TERM
CT
Current
Set
Timer
t0119
Figure 11. AAT3620 Functional Block Diagram
Linear Charging
Functional Description
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.
IBATL IIN
Efficiency of linear charger:
VBAT
VIN
Switch-Mode Charging
Switch-mode current relationship:
S VIN IIN
IBATS
VBAT
Where: s = 90%.
Example: Power Savings
Conventional linear charger IC:
PD VIN VBAT IBAT
A functional block diagram is shown in Figure 11.
5 3.5 0.5 0.75W
Linear vs Switching Battery Charging
Switch-mode charger IC:
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:
V BATIBAT
3.5 0.5
PD
V BATIBAT
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 constant-
voltage 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.
1. Preconditioning-current mode (trickle) charging
2. Constant-current mode charging
3. Constant-voltage mode charging
Constant-Current
Charging Phase
V
I
Preconditioning
Trickle
Battery Discharging
Constant-Voltage
Taper Charging Phase
Constant-Current
Constant-Voltage
Charging Complete
Regulated Voltage
Charging
Phase
Fast Charging Phase Taper Charging Phase
4.2
3
3
2
2
1
Regulated
Current
Battery Recharging
Voltage Threshold
1C
Constant-Current
Mode Voltage
Threshold
2.6
300 mA
Trickle Charging and
Termination Threshold
(Programmable)
L
S
L
Time
S
L
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.
t0220
Figure 12. Charging Current and Battery Voltage vs Time
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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.
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 power-
save 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.
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.
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.
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.
Programming Charging Current (ISET)
The default constant-current mode charging level is user-
programmed 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.
Constant – Current Mode Charging Current
Table 5. ISET Resistor vs Constant-Current Mode Current
Trickle charging continues until the battery voltage reaches
VBAT_BC. At this point the battery charger begins constant-
current 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.
RSET (k)
ICH_CC (mA)
2000
1800
1600
1400
1200
1000
800
100
90
80
70
60
50
40
30
20
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).
600
400
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
Enable
Power On Reset
No
Yes
Power
Input Voltage
VCC > VCC_UVLO
No
Expired
Yes
Fault
Charging Timer
Control
Conditions Monitoring
OV, OT,
Yes
Shut Down
V
TS1<TS<VTS2
No
Preconditioning
Test
Preconditioning
(Trickle Charge)
Yes
V
BAT<VBAT_BC
VBAT > VBAT_BC
No
No
Recharging Test
Constant Current
Charging Mode
Current Phase Test
Yes
Yes
VBAT_RCH > VBAT
V
BAT<VBAT_REG
V
BAT > VBAT_REG
No
Constant Voltage
Charging Mode
Voltage Phase Test
Yes
IBAT>ICH_TERM
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
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:
The charging termination current ICH_TERM can be programmed
by connecting a resistor from TERM to GND:
ICH_TERM RTERM 106
If the TERM pin is left open, the termination current level is set
to 200 mA as the default.
VIN VF( LED )
When the charging current drops to the termination current
level, the device terminates charging and goes into a power-
save mode. The charger remains in this mode until the battery
voltage decreases to a level below the battery recharging
voltage threshold (VBAT_RCH).
RBALLSAT
ILED
Example:
5.0V 2.0V
RBALLSAT
1.5k
2mA
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.
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:
The TERM pin can also be used as a charging current monitor
when the charging current voltage level = 1 A/V.
Upon initiating a charging cycle, the AAT3620 charges the cell
at 10% of the programmed maximum charging until VBAT >
2.6 V.
Status Indicator (STAT1/STAT2)
Charging Status Output
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.
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.
If the cell voltage exceeds 2.6 V prior to the expiration of the
timer, the charging cycle proceeds into fast charging.
The LEDs should be biased with as little current as necessary to
create reasonable illumination. Therefore, a ballast resistor
There are three time-out periods, as shown in Table 7.
Table 6. LED Status Indicator STAT1 and STAT2
Conditions
STAT1
STAT2
Pre-charging
ON
ON
Fast-charging
ON
OFF
End-of-charging (charging complete)
Charging disabled
OFF
ON
OFF
OFF
Sleep mode (VIN < VIN_SLEEP)
No battery with charging enabled
Fault condition (battery 0 V)
OFF
FLASH, 50% duty cycle
OFF
OFF
FLASH, 50% duty cycle
OFF
Fault condition
[battery OT (over-temperature) / UT (under-temperature)]
OFF
OFF
Fault condition (device OT)
Fault (pre-charging time out)
Fault (time out)
OFF
OFF
OFF
OFF
FLASH, 50% duty cycle
OFF
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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
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.
Mode
Time
25 minutes
2.2 hours
Trickle charging (TC) time-out
Trickle charging (TC) + constant-current (CC) mode
time-out
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.
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
Over-Temperature Shutdown
0.1 F value, the time-out periods are doubled.
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.
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.
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.
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:
100nF Hz
f
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.
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
The AAT3620 is offered in a TDFN33-14 package which can
provide up to 2 W of power dissipation when properly bonded to
1
1
RNTC( HOT ) RNTC( COLD )
Ratio Cold Ratio Hot
RT2
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
1
RNTC( HOT )
1 RNTC( COLD )
1
Ratio Hot
Ratio Cold
1 Ratio Cold RT 2 RNTC( COLD )
RT1
Ratio Cold
RT 2 RNTC( COLD )
Where:
Ratio Cold = 0.60 (2% tolerance)
Ratio Hot = 0.30 (2% tolerance)
1. The maximum power dissipation for a given situation
should be calculated:
RNTC(COLD) = Thermistor resistance at Cold (typically 0 °C)
RNTC(HOT) = Thermistor resistance at Hot (typically 45 °C)
For a 10 k NTC thermistor with a Beta of 3370:
RNTC(0C) = 28.1 k
TJ ( MAX ) TA
pD(MAX)
JA
Where:
PD(MAX) = maximum power dissipation (W)
RNTC(45C) = 4.91 k
JA = package thermal resistance (°C/W)
The calculation results are as follows:
RT2 = 31.6 k
TJ(MAX) = maximum device thermal shutdown temperature
(°C) [140 °C]
RT1 = 9.92 k
TA = ambient temperature (°C)
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.
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
IC2H _CC
RDS( ON )HS VBAT RDS( ON )LS
VPIN
tSW fSW ICH _ CC IQOP
VPIN VBAT
RT1
pD(MAX)
Battery Cold Fault
Battery Hot Fault
TS
VPIN
Battery
Pack
RT2
R
NTC
Where:
PD(MAX) = total power dissipation by the device
VPIN = adapter input voltage
0.3 VCC
VBAT = battery voltage at the BAT pin
ICH_CC = constant charging current programmed for the
application
t0221
Figure 14. AAT3620 Battery Temperature Sense Circuit
IQOP = quiescent current consumed by the IC for normal
operation [5 mA]
Thermal Considerations
RDS(ON)HS and RDS(ON)LS = on-resistance of step-down high
and low side MOSFETs
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.
3. The power dissipation for the linear charging mode can
be calculated by the following equation:
pD(MAX)
VPIN VBAT ICH _ BC VPIN IQOP
Where:
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DATA SHEET • AAT3620 SINGLE CELL LI+ SWITCH MODE BATTERY CHARGER
PD(MAX) = total power dissipation by the device
VPIN = input voltage
For the linear mode:
IQOP = 0.005 A
VPIN = 6 V
VBAT = 2 V
VBAT = battery voltage as seen at the BAT pin
ICH_BC = battery conditioning charging current
programmed for the application
ICH_BC = 0.2 A
pD(MAX)
6V 2V 0.2A 6V 0.005A
IQOP = quiescent current consumed by the charger IC for
normal operation [5 mA].
pD(MAX) 0.83W
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:
PCB Layout Guidance
When laying out the PC board, follow the guidelines below to
ensure proper operation of the AAT3620:
PD( MAX ) VPIN IQOP
ICH_BC(MAX)
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.
VPIN VBAT
TJ TA
VPIN IQOP
VIN VBAT
JA
ICH(MAX)
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.
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 Constant-
Current (CC) switching charging mode.
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.
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
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.
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
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.
JA = 50 °C/W
2
0.3 2.8V 0.25
6V
1.5 106
6V 2.8V
Evaluation Board Description
2A
pD(MAX)
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.
5 109
pD(MAX) 1.213W
2A 0.005A 6V
TJ(MAX) 85 50 1.213(C )
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
TP1
TP2
VCC
GND
VIN
100 Ω
L1
4.7 μH
R7
VCC
U1
AAT3620-TDFN33-14
TP4
LX
TP8
R1
10 kΩ
1
2
3
4
5
6
7
14
13
12
11
10
9
VIN
VPIN
PGND
GND
VCC
EN
LX
BAT
C4
10 μF
CS
TB1
BAT
BAT
C7
C2
GND
TP3
JP1
EN
TS
TS
0.1 μF 22 μF
GND
R3
TERM
STAT1
STAT2
49.9 kΩ
R4
ISET
CT
TS
100 kΩ
R5
2 kΩ
JP2
TS
VIN
TP7
8
D1
EP
C3
0.1 μF
STAT1
R2
10 kΩ
R6 D2
TP6
2 kΩ
GND
STAT2
tc94
Figure 15. AAT3620 Evaluation Board Schematic
Table 8. AAT3620 Evaluation Board Bill of Materials
Component
Description
Capacitor, Ceramic, X5R, 10 V, 20%
Capacitor, Ceramic, 20%, 10 V, X5R
Capacitor, Ceramic, 20%, 10 V, X5R
Capacitor, Ceramic, 20%, 10 V, X5R
Inductor, Wurth, 7447789004
Resistor, 5%
Value
Footprint
C4
10 F
0.1 F
22 F
1 F
0805
0603
1206
0603
C1, C3, C6, C7
C2
C5
L1
4.7 H
10 k
2 k
7 mm 7 mm
0402
R1, R2
R5, R6
R3
Resistor, 5%
0402
Resistor, 1%
49.9 k
100 k
100
0402
R4
Resistor, 1%
0402
R7
Resistor, 1%
0402
D1, D2
Red and green SMD
0402
(a) Top Layer
(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"
Index Area
1.650 0.050
3.000 0.050
Top View
Bottom View
0.425 0.050
+ 0.100
0.000
- 0.000
Pin 1 Indicator
(Optional)
Side View
Detail "A"
All dimensions are in millimeters.
t0060
Figure 17. AAT3620 14-pin TDFN Package Dimensions
2.00 0.05
4.00 0.00
1.75 0.10
5.50 0.05
1.10 0.00
12.00 0.30
1.50 0.10
3.30 0.10
Pin 1 Location
0.30 0.05
8.00 0.10
All dimensions are in millimeters
3.30 0.10
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
Part Marking (Note 2)
Manufacturing Part Number (Note 1)
AAT3620IWO-4.2-T1
Evaluation Board Part Number
AAT3620 Single Cell Li+ Switch Mode Battery Charger
6WXYY
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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