AAT3673IXN-4.2-3-T1 [SKYWORKS]
Power Supply Management Circuit,;
| 型号： | AAT3673IXN-4.2-3-T1 |
| 厂家： | 
SKYWORKS SOLUTIONS INC. |
| 描述： | Power Supply Management Circuit, |
| 文件： | 总28页 (文件大小：4076K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
General Description
Features
The AAT3673 BatteryManager is a highly integrated sin-
gle-cell (4.2V) lithium-ion/polymer battery charger and
system power management IC that enables simultane-
ous battery charging and system load management. For
increased safety, the AAT3673 includes over-voltage
input protection (OVP) up to 28V.
• System Load Power Control from Either ADP or
Battery
• ADP Presence Automatically Routes Power from
Source to Load and Charges Battery
• Automatic Charge Reduction Loop to Minimize
Charge Time with USB Input
• 4.0V~6.5V Input Voltage Range
• Over-Voltage Input Protection (OVP) up to 28V
• Digitally Controlled Thermal Protection
• Battery Power Enable
• Programmable Battery Charge Timer
• Battery Cell Temperature Sensing
• Charge Status Reporting (LEDs)
• Automatic Recharge Sequencing
• Battery Over-Voltage, Over-Current, and
Over-Temperature Protection
The AAT3673 provides charging current and system
power management from a single input that may be sup-
plied by an AC adapter or USB port power source (ADP).
This device allows the user to program the battery
charge current up to 1.6A depending on the current
shared with the system output. A battery charge timeout
timer is provided for charging safety and the charge ter-
mination current is also user-programmable.
The AAT3673 employs a battery charge current reduc-
tion function that enables continued system operation in
the event the input source can not supply the required
load current. When operated under excessive thermal
conditions, the AAT3673 has a digitally controlled ther-
mal loop which allows the maximum possible charging
current for any given ambient temperature condition.
• System Load Current Limiting
• 16-pin 4 × 4mm TDFN Package
Applications
• Cellular Phones
• Digital Still Cameras
• Digital Video Cameras
• Global Positioning Systems (GPS)
• MP3 Players
Battery temperature, voltage and charge state are mon-
itored for fault conditions. The AAT3673-1/-2/-4/-5 has
two status monitor output pins (STAT1 and STAT2), and
the AAT3673-3/-6 has one status monitor output (STAT1)
provided to indicate battery charge status by directly
driving external LEDs.
• Handheld PCs
The AAT3673 is available in a Pb-free, thermally
enhanced, space-saving 16-pin 4 × 4mm TDFN package.
Typical Application
System Load
System Load
OUT
OUT
STAT1
STAT1
BAT+
Adapter Input
BAT+
STAT2
BAT
ADP
BAT
AAT3673-3/-6
CADP
10μF
Adapter Input
CBAT
10μF
ADP
BYP
CBAT
10μF
BYP
CADP
10μF
EN1
EN2
AAT3673-1/-2/-4/-5
EN1
EN2
10kΩ
10kΩ
Enable
EN
Temp
Temp
Enable Input to Output
Enable Battery to Out
Enable Input to Output
Enable Battery to Out
TS
TS
ENO
ENO
Battery
Pack
Battery
Pack
CHR Threshold
CHR Threshold
ENBAT
CHRADP
ENBAT
CHRADP
CT
ADPSET
CT
ADPSET
TERM
BYP
TERM
BYP
GND
GND
RADP
CT
RADP
RTERM
CBYP
RTERM
CBYP
CT
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Pin Descriptions
Pin # Name Type Function
Connect a resistor from this pin to GND to set the ADP fast charge constant current. The programmed
constant current level should be less than the ADP current limit set by ADPLIM specification (ILIM_ADP).
Adapter input, source of system load and battery charging. Connect a 1μF (minimum) ceramic ca-
pacitor as close as possible between ADP and GND.
Input for the over-voltage protection bypass node. Connect a 1μF (minimum) ceramic capacitor be-
tween this pin and GND.
1
2
3
ADPSET
ADP
I
I
I
BYP
This open-drain MOSFET device is for charger status reporting. If used for status indication display,
connect an LED Cathode to this node with a series ballast resistor. Connect the LED anode to OUT or
BYP.
AAT3673-1/-2/-4/-5: This open-drain MOSFET device is for charger status reporting. If used for sta-
tus indication display, connect an LED cathode to this node with a series ballast resistor. Connect the
LED anode to OUT or BYP.
AAT3673-3/-6: The EN2 pin (internal pull-up) is used together with the EN1 pin; see Table 2 in the
"Functional Description" section of this datasheet.
4
STAT1
STAT2
O
O
5
6
7
EN2
I
GND
I/O
Common ground connection.
AAT3673-1/-2/-4/-5: Input enable (internal pull-up). Low to enable the ADP switch and battery
charging path; high to disable the ADP switch and battery charging function. See Table 1 in the
"Functional Description" section of this datasheet.
EN
I
AAT3673-3/-6: The EN1 pin (internal pull-up) is used together with the EN2 pin; see Table 2 in the
"Functional Description" section of this datasheet.
Enable Input power to OUT, the dynamic power path from the ADP input to the system load. Active
low input (internal pull-up).
EN1
ENO
I
I
8
9
Battery load switch enable, active low. Battery load switch control the power path between the bat-
tery cell and OUT (internal pull-up).
Battery pack (+) connection. For best operation, a 1μF (minimum) ceramic capacitor should be
ENBAT
BAT
I
10, 11
I/O
placed as close as possible between BAT and GND.
Adaptor mode charge reduction voltage threshold programming pin. The ADP charge reduction
threshold may be adjusted from the default value by placing a voltage divider between this pin to
VADP and GND to this pin.
Connect a resistor between this pin and GND to program the charge termination current threshold.
The charge termination current level can be disabled by connecting this pin to BYP.
12
13
CHRADP
TERM
I
I
Battery temperature sensing input. For typical applications, connect a 10kΩ resistor from BYP to this
pin and a 10kΩ NTC thermistor located inside the battery pack under charge to this pin and GND to
sense battery over temperature conditions during the charge cycle. To disable the TS function, con-
nect this pin to GND.
System dynamic power output supplied from the ADP input, BAT or both. Connect a 10μF ceramic
capacitor between this pin and GND.
14
15
TS
I
OUT
O
Battery charge timer input pin, connect a capacitor on this pin to set the ADP charge timers. Typi-
cally, a 0.1μF ceramic capacitor is connected between this pin and GND. To disable the timer circuit
function, connect this pin directly to GND.
16
EP
CT
EP
I
I/O
Exposed paddle (package bottom). Connect to GND plane under the device.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Pin Configuration
TDFN44-16
(Top View)
AAT3673-1/-2/-4/-5
AAT3673-3/-6
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CT
CT
ADPSET
ADP
ADPSET
ADP
OUT
OUT
BYP
BYP
TS
TS
STAT1
STAT1
TERM
CHRADP
BAT
TERM
CHRADP
BAT
EP
EP
STAT2
GND
EN
EN2
GND
EN1
BAT
BAT
ENO
ENO
ENBAT
ENBAT
Absolute Maximum Ratings
Symbol
Description
Value
Units
VIN
VP
ADP Continuous
30
BAT, OUT, BYP <30ms, Duty Cycle < 10%
EN/EN1, ENO, ENBAT, STAT1, STAT2/EN2
TS, CT, ADPSET, TERM, CHRADP
Junction Temperature Range
Operating Temperature Range
Maximum Soldering Temperature (at Leads, 10 sec)
-0.3 to 8
-0.3 to 8
-0.3 to 8
-40 to 150
-25 to 85
300
V
VN
TJ
TA
°C
TLEAD
Thermal Information1, 2
Symbol
Description
Value
Units
θJA
θJC
PD
Maximum Thermal Resistance
Maximum Thermal Resistance
Maximum Power Dissipation
46
26
2.0
°C/W
W
1. Mounted on 1.6mm thick FR4 circuit board.
2. Derate 50mW/°C above 25°C ambient temperature.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Electrical Characteristics
VADP = 5V, TA = -25°C to +85°C; unless otherwise noted, typical values are TA = 25°C.
Symbol
Description
Conditions
Min
Typ
Max Units
Operation
VOVP
Input Over Voltage Protection Range
AC Adapter / USB Operating Voltage Range
Battery Operating Voltage Range
28
6.5
VCO(REG)
VADP
VBAT
4.0
3.0
V
VADP = 5V, IOUT = 100mA, TA = 25°C
VADP = 4.8V to 6.5V, IOUT = 0mA to
400mA, TA = -25°C to +85°C
4.33
4.40
4.4
4.47
VOUT
ADP to OUT Voltage Regulation
4.26
4.54
VDO
ADP to OUT Regulator Dropout1
ADP Under-Voltage Lockout
IOUT = 400mA
Rising Edge
Hysteresis
Rising Edge
Hysteresis
150
3.1
0.1
2.9
0.1
0.8
250
3.9
mV
V
VUVLO_ADP
2.8
3.0
VUVLO_BAT
IADP_OP
BAT Under-Voltage Lockout
ADP Normal Operating Current
VADP = 5V, VEN = 0V, ICC = 1A
1.6
mA
ADP Shutdown Mode Current
(OVP is Still Active)
VADP = 5V, VEN = 5V, VENBAT = 5V,
No Load
IADP_SHDN
360
VBAT = VCO(REG), VADP = VENBAT = GND
No Load
VBAT = VCO(REG), VADP = 5V,
VEN = VENBAT = 5V
IBAT_OP
Battery Operating Current
100
5
250
μA
IBAT_SLP
Battery Sleep Current
10
2
IBAT_SHDN
Leakage Current from BAT Pin
VBAT = VCO(REG), VENBAT = VADP = 5V
Over-Voltage Protection
VADP Rising Edge
Hysteresis
6.5
6.75
100
100
0.5
7.0
V
VOVPT
Over-Voltage Protection Trip Voltage
mV
μs
VDO_OVP
TRESPOV
Options -1, -2, -3
Dropout Voltage Between ADP and BYP Pins VADP = 5V, IADP = 500mA
200
Over-Voltage Protection Response Time
Step up VADP from 6V to 8V
VADP voltage step down from 8V to
6V, RLOAD = 100Ω, CBYP = 1ꢀF
VADP voltage step up from 0V to
5V, RLOAD = 100Ω, CBYP = 1ꢀF
TOVPON_130μs
OVP Switch Release Delay Time
130
150
ꢀs
TOVPSTARTON_130μs OVP Switch Start Up Delay Time
Options -4, -5, -6
VADP voltage step down from 8V to
6V, RLOAD = 100Ω, CBYP = 1ꢀF
VADP voltage step up from 0V to
5V, RLOAD = 100Ω, CBYP = 1ꢀF
TOVPON_80ms
OVP Switch Release Delay Time
80
80
ms
TOVPSTARTON_80ms OVP Switch Start Up Delay Time
Power Switches
RDS(ON)_SWA
RDS(ON)_SWB
RDS(ON)_CHA
ADP-to-OUT FET On Resistance
BAT-to-OUT FET On Resistance
ADP Battery Charging FET On-Resistance
VADP = 5.0V
VBAT = 4.1V
VADP = 5.0V
600
60
600
mΩ
Battery Charge Voltage Regulation
VCO(REG) Output Charge Voltage Regulation
VMIN
4.158
2.8
4.20
2.9
4.242
3.0
Preconditioning Voltage Threshold
Battery Recharge Voltage Threshold
VCO(REG) VCO(REG) VCO(REG)
- 0.17
VRCH
- 0.1
- 0.05
V
CHRADP Open; Reduce Charge
Current When ADP is Below VCHR_TH
VADP = 4.5V
VCHR_TH
Default ADP Charge Reduction Threshold
CHRADP Pin Voltage Accuracy
4.5
VCHR_REG
1.9
2.0
2.1
1. VDO is defined as VADP - VOUT when VOUT is 98% of normal.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Electrical Characteristics (continued)
VADP = 5V, TA = -25°C to +85°C; unless otherwise noted, typical values are TA = 25°C.
Symbol Description
Current Regulation
Conditions
Min
Typ
Max
Units
ILIM_ADP
ILIM_BAT
ICH_CC_ADP
ΔICH_CC_ADP
ICH_CC_ADP
ADP Current Limit (Fixed)
BAT_OUT Current Limit (Fixed)
ADP Charge Constant Current Charge Range
1.6
2.3
100
A
1600
12
mA
%
/
Constant Current Charge Current Regulation Tolerance ICH_CC_ADP = 1A
ADP Trickle Charge Current
-12
%
ICH_CC_ADP
ICH_TKL_ADP
10
VADPSET
VTERM
ADPSET Pin Voltage Regulation
TERM Pin Voltage Regulation
2
2
V
Constant Current Charge Current Set Factor: ICH_ADP
IADPSET
Termination Current Set Factor: ICH_TERM/ITERM
/
KI_CC_ADP
KI_TERM
29300
2000
AAT3673-3 Only
ICH_LO USB Low Level Charge Current (Fixed)
ICH_HI USB High Level Charge Current (Fixed)
Logic Control/Protection
VEN1 = VEN2 = 0
VEN1 = 0; VEN2 = 5V
85
450
100
500
mA
V
Input High Threshold
Input Low Threshold
1.6
VEN
0.4
0.4
STATx Pin Sinks
8mA
VSTATx
Output Low Voltage
Fast Charge (Trickle Charge + Constant Current +
Constant Voltage Charges Together) Timeout
Trickle Charge Timeout
TC
CCT = 0.1μF
7
Hour
Min
TTKL
VOVP
TC/8
VCO(REG)
+ 0.15
VCO(REG)
+ 0.1
VCO(REG)
+ 0.2
Battery Over-Voltage Protection Threshold
V
IOCP
TS1
TS2
Battery Charge Over-Current Protection Threshold
High Temperature Threshold
Low Temperature Threshold
In All Modes
Threshold
Threshold
100
30
60
% ICH_CC
% VBYP
28
58
32
62
TLOOP_IN
TLOOP_OUT
TLOOP_REG
Digital Thermal Loop Entry Threshold
Digital Thermal Loop Exit Threshold
Digital Thermal Loop Regulated Temperature
115
95
100
140
15
°C
Threshold
Hysteresis
TSHDN
Chip Thermal Shutdown Temperature
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Adapter Supply Operating Current vs. RADPSET
Constant Charge Current vs. RADP
1.2
10000
Constant Current
Pre-Conditioning
Constant Current
Pre-Conditioning
1000
1.1
1.0
0.9
0.8
0.7
100
10
1
10
100
1000
10
100
1000
RSET (kΩ)
RADP (kΩ)
Output Charge Voltage Regulation
Constant Output Charge Voltage
vs. Temperature
Accuracy vs. Adapter Voltage
(VCO(REG) = 4.2V)
4.201
0.25
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
-0.25
4.200
4.199
4.198
4.197
4.196
4.195
4.194
4.193
5
5.25
5.5
5.75
6
6.25
6.5
-25 -15
-5
5
15
25
35
45
55
65
75
85
V
ADP (V)
Temperature (°C)
Battery Sleep Current vs. Temperature
Operating Current vs. Temperature
0.90
0.88
0.86
0.84
0.82
0.80
0.78
0.76
0.74
0.72
0.70
6.0
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
-25 -15
-5
5
15
25
35
45
55
65
75
85
-25 -15
-5
5
15
25
35
45
55
65
75
85
Temperature (°C)
Temperature (°C)
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Constant Charging Current
Charging Current vs. Battery Voltage
vs. Adapter Voltage
1200
1100
1050
1000
950
1A
500mA
100mA
1000
800
600
400
200
0
900
850
800
750
700
VBAT = 3.6V
VBAT = 3.9V
V
BAT = 4.1V
4
4.25 4.5 4.75
5
5.25 5.5
5.75
6
6.25 6.5
2.5
2.75
3
3.25
3.5
3.75
4
4.25
4.5
6.5
1.8
Adapter Voltage (V)
Battery Voltage (V)
Preconditioning Voltage Threshold
vs. Temperature
Preconditioning Voltage Threshold
vs. Adapter Voltage
2.94
2.93
2.92
2.91
2.90
2.89
2.88
2.87
2.86
2.94
2.93
2.92
2.91
2.90
2.89
2.88
2.87
2.86
-25 -15
-5
5
15
25
35
45
55
65
75
85
4.5
4.75
5
5.25
5.5
5.75
6
6.25
Temperature (°C)
Adapter Voltage (V)
Recharge Voltage Threshold vs. Temperature
Adapter Charging Current
vs. Output Current
(VADP = 5V; RSET = 56.7kΩ)
(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 0V)
4.16
4.14
4.12
4.10
4.08
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
IADP
IBAT
0.0
0
-40
-15
10
35
60
85
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
Temperature (°C)
Output Current (A)
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
ADP Charge Current
ADP Charge Current
(500mA Charging Setting)
(1A Charging Setting)
5
4.5
4
5
4.5
1A
4
500mA
0
0
1A
500mA
0
0
Time
Time
Over-Voltage Trip Voltage
vs. Temperature
Over-Voltage Trip Voltage
Accuracy vs. Temperature
0.50
0.40
0.30
0.20
0.10
0.00
-0.10
-0.20
-0.30
-0.40
-0.50
6.80
6.79
6.78
6.77
6.76
6.75
6.74
6.73
6.72
6.71
6.70
-25 -15
-5
5
15
25
35
45
55
65
75
85
-25 -15
-5
5
15
25
35
45
55
65
75
85
Temperature (°C)
Temperature (°C)
CT Pin Capacitance vs. Counter Timeout
LDO Dropout Voltage vs. Load Current
1.00
450
400
350
300
250
200
150
100
50
Full Charge
Trickle Charge
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
85°C
25°C
-40°C
0
0
1
2
3
4
5
6
7
0
200
400
600
800
1000
Time (hours)
Load Current (A)
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
LDO Output Voltage Noise
LDO Power Supply Rejection Ratio, PSRR
(IOUT = 10mA, Power BW: 100Hz to 300KHz)
(VADP = 5V, IOUT = 10mA, BW: 50Hz to 300KHz)
600
500
400
300
200
100
0
70
60
50
40
30
20
10
0
100
1000
10000
100000
1000000
100
1000
10000
100000
Frequency (Hz)
Frequency (Hz)
BAT to OUT RDS(ON) vs. Battery Voltage
ADP to BYP RDS(ON) vs. Battery Voltage
100
90
80
70
60
50
40
30
20
350
300
250
200
150
100
50
85°C
25°C
-25°C
85°C
25°C
-25°C
0
4.5
3
3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9
4
4.1 4.2
4.75
5
5.25
5.5
5.75
6
6.25
6.5
VBAT (V)
VBAT (V)
BAT to OUT RDS(ON) vs. Temperature
ADP to BYP RDS(ON) vs. Temperature
80
70
60
50
40
30
20
10
0
350
300
250
200
150
100
50
0
-25 -15
-5
5
15
25
35
45
55
65
75
85
-25 -15
-5
5
15
25
35
45
55
65
75
85
Temperature (°C)
Temperature (°C)
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
High Temperature Threshold
Low Temperature Threshold
(VADP = 5V)
(VADP = 5V)
62
61.5
61
32
31.5
31
30.5
30
60.5
60
29.5
29
59.5
59
28.5
28
58.5
58
-25 -15 -5
5
15
25
35
45
55
65
75
85
-25 -15 -5
5
15
25
35
45
55
65
75
85
Temperature (°C)
Temperature (°C)
Input High Threshold vs. Adapter Voltage
Input Low Threshold vs. Adapter Voltage
1.4
1.4
-25°C
25°C
85°C
-25°C
25°C
85°C
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
4.5
4.75
5
5.25
5.5
5.75
6
6.25
6.5
4.5
4.75
5
5.25
5.5
5.75
6
6.25
6.5
VADP (V)
ADP to OUT RDS(ON) vs. Temperature
OVP Switch Turn-On Time
(VADP = 6.75V
→
5V; VOVPT = 6.75V; ICH = 1A)
600
500
400
300
200
100
0
12
10
8
4
VADP
VBYP
ICH
3.5
3
6
2.5
2
4
2
1.5
1
0
-2
-4
0.5
0
-25 -15
-5
5
15
25
35
45
55
65
75
85
Temperature (°C)
Time (100μs/div)
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
OVP Event Transient
OVP Event Transient
(VADP = 6.3V
→
8V; VOVPT = 6.75V; ICH_CC = 1A)
(VADP = 6.3V → 8V; VOVPT = 6.75V; ICH_CC = 1A)
12
10
8
4
12
10
8
4
VADP
VBYP
ICH
VADP
VBYP
ICH
3.5
3
3.5
3
6
2.5
2
6
2.5
2
4
4
2
1.5
1
2
1.5
1
0
0
-2
-4
0.5
0
-2
-4
0.5
0
Time (1μs/div)
Time (5μs/div)
Response of Out when Switching from VBAT to VADP
(VADP = 0V → 5V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 0V; ENO = 0V; COUT = 10μF)
Response of Out when Switching from VADP to VBAT
(VADP = 5V → 0V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 0V; ENO = 0V; COUT = 10μF)
8
7
6
5
4
3
2
1
0
4.2
4.1
4
8
7
6
5
4
3
2
1
0
4.2
VADP
VOUT
VBAT
VADP
VOUT
VBAT
4.1
4
3.9
3.8
3.7
3.6
3.5
3.4
3.9
3.8
3.7
3.6
3.5
3.4
Time (100μs/div)
Time (200μs/div)
Response of Out when Switching from VBAT to VADP
(VADP = 0V→ 5V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 5V; ENO = 0V; COUT = 10μF)
Response of Out when Switching from VADP to VBAT
(VADP = 5V → 0V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 5V; ENO = 0V; COUT = 10μF)
8
7
6
5
4
3
2
1
0
4.2
8
7
6
5
4
3
2
1
0
4.2
VADP
VOUT
VBAT
VADP
VOUT
VBAT
4.1
4
4.1
4
3.9
3.8
3.7
3.6
3.5
3.4
3.9
3.8
3.7
3.6
3.5
3.4
Time (200μs/div)
Time (1ms/div)
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Response of Out when ENO = 5V
(VADP = 0V → 5V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 0V; COUT = 10μF)
Response of Out when ENO = 5V
(VADP = 5V → 0V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 0V; COUT = 10μF)
8
7
6
5
4
3
2
1
0
4.2
4.1
4
8
4.2
4.1
4
VADP
VOUT
VBAT
VADP
VOUT
VBAT
7
6
5
4
3
2
1
0
3.9
3.8
3.7
3.6
3.5
3.4
3.9
3.8
3.7
3.6
3.5
3.4
Time (1ms/div)
Time (1ms/div)
Response of Out when Inserting Battery
(VBAT = 0V → 3.6V; VADP = 5V; RLOAD = 50Ω;
ENBAT = 0V; ENO = 0V; COUT = 10μF)
Response of Out when Removing Battery
(VBAT = 4.1V → 0V; VADP = 5V; RLOAD = 50Ω;
ENBAT = 0V; ENO = 5V; COUT = 10μF
)
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
VADP
VOUT
VBAT
VADP
VOUT
VBAT
Time (200μs/div)
Time (500μs/div)
Response of Out when Inserting Battery
Response of Out when Removing Battery
(VBAT = 4.1V → 0V; VADP = 5V; RLOAD = 50Ω;
ENBAT = 5V; ENO = 0V; COUT = 10μF)
8
(VBAT = 0V → 3.6V; RLOAD = 50Ω; VADP = 5V;
ENBAT = 5V; ENO = 0V; COUT = 10μF
)
8
VADP
VADP
VOUT
VBAT
7
7
6
5
4
3
2
1
0
VOUT
VBAT
6
5
4
3
2
1
0
Time (200μs/div)
Time (500μs/div)
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Functional Block Diagram
BYP
ADP
ADP to OUT Switch
OUT
OVP
Sense
And
Control
EN/EN1
ENO
ENBAT
BAT
TS
CT
Charge
System
Control
TERM
Voltage
Sense
ADPSET
CHRADP
STAT1
Ref.
Thermal and
Current Sense
GND
STAT2/EN2
When an input power source is applied to the AAT3673,
the adapter input will provide power to the system load
and charge the battery. Without a valid supply present
on the ADP pin, the battery will power the system load
as long as the battery voltage is greater than 2.9V. The
internal battery voltage sense circuit will disconnect the
battery from the load if the cell voltage falls below 2.9V
to protect the battery cell from over-discharge which
results in shorter battery life.
Functional Description
The AAT3673 is a single input dynamic battery charger
and power control IC. The input power control is designed
to be compatible with either AC power adapter or USB
port power sources. In addition, this device also provides
dynamic power control to charge a single cell Li-ion bat-
tery and power a system load simultaneously. The OUT
pin provides regulated 4.4V when input requirement is
met. If the input voltage is not sufficiently high to ensure
regulated OUT, the output will track input assuming the
drop through the switch ADP to BAT or BAT to OUT.
The system load current drawn from the battery is lim-
ited internally. The AAT3673 precisely regulates battery
charge current and voltage for 4.2V Li-ion battery cells.
The battery charge current can be programmed up to
1.6A. During battery charge, the AAT3673 pre-conditions
(trickle charges) the battery with a lower current when
the battery voltage is less than 2.9V. The system then
charges the battery in a constant current fast charge
mode when the battery voltage is above 2.9V. When the
battery voltage rises to 4.2V, the charger will automati-
cally switch to a constant voltage mode until the charge
current is reduced to the programmed charge termina-
tion current threshold.
The device contains a charge regulation pass devices to
control the charge current or voltage from the adapter
input power to the battery, it also contains two addi-
tional load switches to control and route input power to
supply the system load and manage power from the bat-
tery to the system load. This charge control and switch
array permits dynamic charging of the battery cell and
control of power to the system load simultaneously.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
The internal arrangement of load switches and the charge
The digital thermal loop control is dynamic in the sense
that it will continue to adjust the battery charging current
as operating conditions change. The digital thermal loop
will reset and resume normal operation when the power
dissipation or over temperature conditions are removed.
regulation device provide dynamic power sourcing to the
system load. If the system load exceeds the input current
supply from the input source, additional current can be
supplied from the battery cell. At all times, the device will
manage distribution of power between the source, the
battery and the system simultaneously in order to sup-
port system power needs and charge the battery cell with
the maximum amount of current possible. The AAT3673
has a unique internal charge current reduction control
loop that will prevent an input source from overload. In
the case of USB charging from a USB port VUSB supply,
there are two events which need to be guarded against.
The first is charging from a defective or inadequate USB
host supply; the second problem could arise if the pro-
grammed charge current plus the system supply demand
through the AAT3673 exceeds the ability of a given USB
port. In either case, the AAT3673 charge reduction (CHR)
loop will activate when the input source drops below the
VCHR_TH threshold of 4.5V. The CHR loop will automatically
reduce the charge current to the battery until the supply
voltage recovers to a point above the VCHR_TH threshold.
This unique feature protects the charger, system and
source supply in the event an adapter or power source
does not meet the programmed ADP charging mode cur-
rent demand. The resulting CHR system will permit the
charging of a battery cell with the maximum possible
amount of charge current for any given source.
Battery temperature and charge state are fully moni-
tored for fault conditions. In the event of an over voltage,
over-current, or over-temperature failure, the device will
automatically shut down, thus protecting the charging
device, control system, and the battery under charge. In
addition to internal charge controller thermal protection,
the AAT3673 also provides a temperature sense feedback
function (TS pin) from the battery to shut down the
device in the event the battery exceeds its own thermal
limit during charging. All fault events are reported to the
user by the simple status LED(s) which is (are) inter-
nally controlled by open drain NMOS switch(es).
Charging Operation
The AAT3673 has four basic modes for the battery
charge cycle: pre-conditioning/trickle charge, constant
current fast charge, constant voltage, and end of charge/
sleep state.
Battery Preconditioning
Before the start of charging, the AAT3673 checks sev-
eral conditions in order to assure a safe charging envi-
ronment. The input supply must be above the minimum
operating voltage, or under-voltage lockout threshold
(VUVLO), for the charging sequence to begin. Also, the cell
temperature, as reported by a thermistor connected to
the TS pin from the battery, must be within the proper
window for safe charging. When these conditions have
been met and a battery is connected to the BAT pin, the
AAT3673 checks the state of the battery by sensing the
cell voltage. If the cell voltage is below the precondition-
ing voltage threshold (VMIN), the AAT3673 begins pre-
conditioning the battery cell with charge current which is
10% of the fast charge current.
During battery charging, the device temperature can
rise due to power dissipation within the charge current
control device and the load switches. In some cases, the
power dissipation in the device may cause the junction
temperature to rise up to its thermal shutdown thresh-
old. In the event of an internal over-temperature condi-
tion caused by excessive ambient operating temperature
or an excessive power dissipation condition, the AAT3673
utilizes a digitally controlled thermal loop system that
will reduce the charging current to prevent the device
from entering thermal shutdown. The digital thermal
loop will maintain the maximum possible battery charg-
ing current for the given set of input to output power
dissipation and ambient temperature conditions.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Alternately, to select the resistor value for a given
charging current use:
Fast Charge/Constant Current Charging
Battery cell preconditioning continues until the voltage
measured by the internal sense circuit exceeds the pre-
conditioning voltage threshold (VMIN). At this point, the
AAT3673 begins the fast charge constant current phase.
The fast charge constant current (ICH_CC) level is pro-
grammed by the user via the RADP resistor. The AAT3673
remains in constant current charge mode until the bat-
tery reaches the voltage regulation point, VCO(REG). The
formula for fast charge current as a function of current
setting resistor is:
2V
ICH_CC
RADP = KI_CC_ADP
·
where KI_CC_ADP = 29300 (typical).
Constant Voltage Charging
The charge control system transitions to a regulated con-
stant voltage phase from the constant current fast charge
mode when the battery voltage reaches the end of charge
regulation threshold (VCO(REG)). The regulation voltage
level is factory programmed to 4.2V (±1%). The charge
current in the constant voltage mode drops as the bat-
tery cell under charge reaches its maximum capacity.
2V
RADP
ICH_CC = KI_CC_ADP
·
Battery
UVLO
Trickle
Charge
Constant Current
Charge Phase (CC)
Constant Voltage
Charge Phase(CV)
Constant Current
Charge Phase
Constant Voltage
Charge Phase
Recharge Phase
ICH_CC
ICH_CC
Termination
Phase
Termination
Phase
VCO(REG)
VRCH
VMIN
ICH_TERM
when
ICH_TERM
when
VBAT
=
VBAT
=
VCO( REG)
VCO( REG)
VUVLO
ICH_TKL
Figure 1: Current vs. Voltage and Charger Time Profile.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Control Inputs
ENO
Pass Devices
EN
ENBAT
ADP - OUT
ADP - BAT
BAT - OUT
1
0
1
0
1
0
1
0
1
1
0
0
1
1
0
0
1
1
1
1
0
0
0
0
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Table 1: AAT3673-1/-4 and AAT3673-2/-5 Battery and Adapter Dynamic Path Control Table.
Control Inputs
Pass Devices
ADP-BAT
EN1
EN2
ENO
ENBAT
ADP-OUT
BAT-OUT
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
Table 2: AAT3673-3/-6 Battery and Adapter Dynamic Path Control Table.
End of Charge Cycle Termination
and Recharge Sequence
ITERM (mA)
RTERM (kΩ)
320
174
125
95
77
64
58
50
49
42
11.0
21.0
30.9
41.2
51.1
61.9
71.5
80.6
90.9
100.0
110.0
When the charge current drops to the user programmed
charge termination current at the end of the constant
voltage charging phase, the device terminates charging,
enables the recharge control circuit and enters the sleep
state. The charger will remain in the sleep state until the
battery voltage decreases to a level below the battery
recharge voltage threshold (VRCH). The charge termina-
tion current is programmed via the RTERM resistor which
is connected between the TERM pin and ground. Use the
values listed in Table 3 to set the desired charge termi-
nation current. The programmed charge termination
current will remain at the same set level regardless of
which fast charge ADP, USBH or USBL constant current
mode is selected.
37
Table 3: Charge Termination Current
Programming Resistor Values.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
If the desired end of charge termination current level is
not listed in Table 3, the TERM resistor value may be
calculated by the following equation:
switch and the ADP-OUT switch are all enabled. Under
this condition, the adapter input current is limited inter-
nally to 1.6A minimum (ILIM_ADP) and is split between the
system load (IADP-OUT) and the battery charge current
(ICH_CC). The charge current is dynamically adjusted as
the system load varies in order to maintain the adapter
input current at or below the 1.6A minimum.
2V
RTERM
ICH_TERM = KI_TERM
·
or
ILIM_ADP ≥ ICH_CC + IADP-OUT
2V
ICH_TERM
RTERM = KI_TERM
·
For example: If RSET = 57.6kꢁ, the fast charge current
is set for 1A. For a system load of 0mA, the battery
charge current is 1A and the adapter current is less than
1.6A. As the system load is increased the battery charge
current is 1A, until the system load is equal to 0.6A and
the adapter input current is 1.6A. Increasing the system
load above 0.6A causes the battery charge current to be
reduced, until the system load is equal to 1.6A and the
battery charge current is 0A. Further increases in the
system load will result in the battery supplying the bal-
ance of the current; a system load of 1.8A requires the
battery to supply 0.2A.
KI_TERM = 2000 (typical)
When the input supply is disconnected, the charger also
automatically enters power-saving sleep mode.
Consuming less than 1μA in sleep mode, the AAT3673
minimizes battery drain when not charging. This feature
is particularly useful in applications where the input sup-
ply level may fall below the usable range of the charge
reduction control or under-voltage lockout level. In such
cases where the AAT3673 input voltage drops, the
device will enter the sleep mode and automatically
resume charging once the input supply has recovered
from its fault condition.
Over-Voltage Protection
In normal operation, an N-channel MOSFET acts as a
slew-rate controlled load switch, connecting and discon-
necting the power supply from ADP to BYP. A low resis-
tance 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 of 6.75V, the
device turns off the internal switch which disconnects the
charger from the abnormal input voltage, therefore pre-
venting any damage to the charger. The OVP turn-on and
release delay times for the AAT3673-1/-2/-3 are 150μs
and 130μs respectively, while in the AAT3673-4/-5/-6
these delay times are extended to 80ms typically. If an
over-voltage condition is applied at the time of the device
enable, then the load switch will remain OFF.
Dynamic Current Regulation
There are two possible configurations where the system
load current and charge current are dynamically con-
trolled. In the first case, the ADP-BAT switch and the
BAT-OUT switch are enabled, and the ADP-OUT switch is
disabled. Under this condition, the adapter input current
is set by the RSET resistor (fast charge current setting,
I
CH_CC) and is split between the system load (IBAT-OUT) and
the battery charge current (IBAT). The charge current is
dynamically adjusted as the system load varies in order
to maintain the adapter input current.
ICH_CC = IBAT + IBAT-OUT
For example: If RSET = 57.6kꢁ, the fast charge current
is set for 1A. For a system load of 0mA, the battery
charge current is 1A. As the system load is increased
the battery charge current is reduced, until the system
load is equal to 1A and the battery charge current is 0A.
Further increases in the system load will result in the
battery supplying the balance of the current; a system
load of 1.2A requires the battery to supply 0.2A.
OVP Under-Voltage Lockout (UVLO)
The AAT3673 OVP circuitry has a fixed 3.1V under-
voltage lockout level (UVLO). When the adapter input
voltage is less than the UVLO threshold level, the
MOSFET load switch is turned off. A 100mV of hysteresis
is included to ensure circuit stability.
In the second case, the ADP-BAT switch, the BAT-OUT
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
cell at 10% of the programmed maximum charge until
VBAT >2.9V. If the cell voltage fails to reach the precondi-
Temperature Sense (TS)
Inside the AAT3673, the internal battery temperature
sensing circuit is comprised of two comparators which
establish a voltage window for safe operation. The
thresholds for the TS operating window are bounded by
the TS1 and TS2 specifications. Referring to the Electrical
Characteristics table in this datasheet, the TS1 threshold
= 30% · VBYP and the TS2 threshold = 60% · VBYP. If the
use of the TS pin function is not required by the system,
it should be terminated to ground.
tioning threshold of 2.9V (typ) before the safety timer
expires, the cell is assumed to be damaged and the
charge cycle terminates. If the cell voltage exceeds 2.9V
prior to the expiration of the timer, the charge cycle pro-
ceeds into fast charge. There are two timeout periods: 50
minutes for Trickle Charge mode, and 6 hours for Constant
Current Mode and Constant Voltage mode altogether.
The CT pin is driven by a constant current source and will
provide a linear response to increases in the timing
capacitor value. The timeout is 7 hours (typical) using a
100nF capacitor for CT. Thus, for a 200nF capacitor it
would be 14 hours, and for a 50nF capacitor it would be
3.5 hours respectively.
BYP
AAT3673
BYP
0.60 x VBYP
For a given target delay time TD (in hours) calculate:
Battery Cold Fault
TS
(TD · 100nF)
CT =
7
Battery
Pack
Battery Hot Fault
If the programmable watchdog timer function is not
needed, it can be disabled by terminating the CT pin to
ground. The CT pin should not be left floating or unter-
minated, as this will cause errors in the internal timing
control circuit. The constant current provided to charge
the timing capacitor is very small, and this pin is suscep-
tible to noise and changes in capacitance value. Therefore,
the timing capacitor should be physically located on the
printed circuit board layout as close as possible to the CT
pin. Since the accuracy of the internal timer is dominated
by the capacitance value, a 10% tolerance or better
ceramic capacitor is recommended. Ceramic capacitor
materials, such as X7R and X5R types, are a good choice
for this application.
x VBYP
Figure 2: AAT3673 Battery
Temperature Sensing Circuit.
Charge Safety Timer (CT)
While monitoring the charge cycle, the AAT3673 utilizes a
charge timer to help identify damaged cells and to ensure
that the cell is charged safely. Operation is as follows:
upon initiating a charging cycle, the AAT3673 charges the
System Operation Flowchart
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Switch
On
UVLO
ADP > VUVLO
Yes
Yes
Power On
Reset
V
No
No
Thermal
Loop Enable
Sleep
Mode
Device
Temperature
Monitor
Enable
Dynamic Charge
VENBAT > VEN
No
No
Fault Condition
Monitor
OV, OT, OC
Yes
Shutdown
Mode
TJ > 110°C
No
Yes
Yes
Connect
ADP to BAT
and OUT
Thermal Loop
Current Reduction
Battery
Battery
Temperature
Fault
.
Yes
No
Temperature Sense
VTS1 < TS < VTS2
Expire
Charge Timer
(Enable on
Charger reset)
Power
Share
No
Set
Low Current
Conditioning
Charge
Preconditioning
Test
VMIN > VBAT
Yes
Yes
Recharge Test
V
RCH > VBAT?
No
Current
Limit Test
IOUT > ILIM_ADP
No
Current
Yes
Constant Current
Charging Mode
Phase Test
Yes
VCO(REG) > VBAT
Reduce
Charging
Current to BAT
No
Voltage
Charge
Reduction
Mode
Phase Test
Yes
Constant Voltage
Charge Mode
ICH_CC > ICH_TERM
No
IOUT + ICH_CC
> ILIM_BAT
?
No
Yes
Yes
Input Voltage
Level Test
VADP < VCHR_TH
Voltage
Regulation
Enable
Charge
Complete
No
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Applications Information
BYP
BYP
Adapter or USB Port Power Source
In the adapter mode, constant current charge levels up
to 1.6A may be programmed by the user. The ADP input
will operate over a range from 4.0V to 6.5V.
R3
R4
1M
CHRADP
VCH_REG= 2.0
The constant fast charge current for the adapter input
mode is set by the RADP resistor connected between the
ADPSET pin and ground. The battery preconditioning or
trickle charge current is fixed at 10% of the programmed
fast charge constant current level. Refer to Table 4 for
recommended RADP values for a desired constant current
charge level. Please refer to the Battery Charge Status
Indication discussion on page 21 of this datasheet for
further details.
800k
Figure 3: Internal Equivalent Circuit
for the CHRADP Pin.
Charge Reduction
Adapter Input Charge
Under normal operation, the AAT3673 should be operat-
ed from an adapter power source with a sufficient capac-
ity to supply the desired constant charge current plus
any additional load which may be placed on the source
by the operating system. In the event that the power
source to the ADP pin is unable to provide the pro-
grammed fast charge constant current, or if the system
under charge must also share supply current with other
functions, the AAT3673 will automatically reduce the ADP
fast charge current level to maintain the integrity of the
source supply, power the operating system, and charge
the battery cell with the remaining available current.
Inhibit and Resume
The AAT3673 has an under-voltage lockout (UVLO) and
power on reset feature to protect the charger IC in the
event the voltage on the BYP pin drops below the UVLO
threshold. Under a UVLO condition, the charger will sus-
pend the charging process. When power is applied to the
adapter pin again or the UVLO condition recovers, the
system charge control will asses the state of charge on
the battery cell and will automatically resume charging in
the appropriate mode for the condition of the battery.
The ADP charge reduction system becomes active when
the voltage on the ADP input falls below the ADP charge
reduction threshold (VCHR_TH), which is preset to 4.5V.
Should the input supply drop below the VCHR_TH threshold,
the charge reduction system will reduce the fast charge
current level in a linear fashion until the voltage sensed
on the ADP input recovers to the charge reduction thresh-
Programming Fast Charge Current
The constant current charge level is user programmable
with a set resistor connected between the ADPSET pin
and ground. The accuracy of the constant charge cur-
rent, as well as the preconditioning trickle charge cur-
rent, is dominated by the tolerance of the set resistor
used. For this reason, a 1% tolerance metal film resistor
is recommended for the set resistor function. The con-
stant charge current levels from 100mA to 1.6A may be
set by selecting the appropriate value from Table 4.
old voltage. The ADP charge reduction threshold (VCHR_TH
)
may be externally set to a value other than 4.5V by plac-
ing a resistor divider network between the BYP pin and
ground with the center connected to the CHRADP pin. The
ADP charge reduction feature may be disabled by shorting
the CHRADP pin directly to the BYP pin.
Charge current setting formula:
VADP
RADP
The following equation may be used to approximate the
ADP charge reduction threshold above or below 4.5V:
ICH_CC_ADP (typ) =
· KII_CC_ADP
2.0V
(R4/[R4 + R3])
VCHR_TH
=
where R4 and R3 « 500k.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Battery Connection (BAT)
Constant Charge
Current (mA)
Set Resistor Value (kꢀ)
A single cell Li-Ion/Polymer battery should be connected
between BAT input and ground.
100
200
300
400
500
800
1000
1600
576
287
191
143
113
69.8
56.2
33.4
Battery Charge Status Indication
Charge Status Indicator Outputs
There are six device options, which are described in Table
11 on page 26. All options include recharge sequence
after adapter is inserted. The AAT3673-1/-4 and AAT3673-
2/-5 have two status (STAT1 and STAT2) pins and one
enable pin (EN); the AAT3673-3/-6 has one status pin
(STAT1) and two enable pins (EN1 and EN2)
Table 4: RADP Values.
Figure 4 shows the relationship of constant charging cur-
rent and set resistor values for the AAT3673.
Charge State
STAT1
STAT2
10000
Pre-Charge
Fast-Charge
Charge Complete
ON
ON
OFF
ON
OFF
ON
Constant Current
Pre-Conditioning
1000
Charge Disabled, Sleep Mode or
Fault Condition
OFF
OFF
100
10
1
Flash (1Hz, Flash (1Hz,
40% duty) 40% duty)
No Battery (with Charge Enabled)
Table 6: AAT3673-1/-4 LED Status Indicators.
10
100
1000
10000
Charge State
STAT1
STAT2
RADP (kΩ)
Pre-Charge or Fast-Charge
ON
OFF
Charge Complete, Charge Dis-
abled, or Sleep Mode
Fault Condition
OFF
OFF
OFF
ON
Figure 4: Constant Charging Current
vs. Set Resistor Values.
Flash (1Hz,
40% duty)
No Battery (with Charge Enabled)
OFF
For the AAT3673-3/-6, the two enable inputs select
between four possible operating modes: two internally
fixed charging current modes (USB Low =100mA or USB
high = 500mA), an externally programmable charging
current mode, and a shutdown mode. The STAT1 func-
tionality is identical for all three modes and does not
depend on the EN1 and EN2 enable inputs.
Table 7: AAT3673-2/-5 LED Status Indicators.
Charge State
STAT1
Pre-Charge or Fast-Charge
ON
Charge Complete, Charge Disabled, Sleep
Mode, or Fault Condition
OFF
EN1
EN2
Operating Mode
Flash (1Hz,
40% duty)
No Battery (with Charge Enabled)
0
0
0
1
USB Low, 100mA charging current
USB High, 500mA charging current
Using RADP to program charging
current
Table 8: AAT3673-3/-6 LED Status Indicators.
1
1
0
1
Fault condition can be one of the following:
Shutdown mode
•
•
•
•
Battery over-voltage (OV)
Table 5: AAT3673-3/-6 Operating Modes.
Battery temperature sense hot or cold
Battery charge timer time-out
Chip thermal shutdown
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
The thermal management system measures the internal
circuit die temperature and reduces the charge current
when the device exceeds a preset internal temperature
control threshold. Once the thermal loop control becomes
active, the constant charge current is initially reduced by
a factor of 0.44.
Status Indicator Display
Simple system charging status states can be displayed
using one LED each in conjunction with the STAT1 and
STAT2 pins of the AAT3673-1/-2/-4/-5 and the STAT1
pin of the AAT3673-3/-6. These pins have simple switch-
es connecting the LED’s cathodes to ground. Refer to
Tables 6, 7, and 8 for LED display definitions. The LED
anodes should be connected to BYP or other system
power that does not exceed 6.5V, depending upon sys-
tem design requirements. The LED should be biased with
as little current as necessary to create reasonable illumi-
nation; therefore, a ballast resistor should be placed
between the LED cathode and the STAT1 and STAT2 pins
of the AAT3673-1/-2/-4/-5 and the STAT1 pin of the
AAT3673-3/-6. A 2mA bias current should be sufficient
to drive most low cost green or red LEDs. It is not rec-
ommended to exceed 8mA when driving an individual
status LED.
The initial thermal loop current can be estimated by the
following equation:
Constant Charging: ITLOOP = ICCADP · 0.44
The thermal loop control re-evaluates the internal die
temperature every three seconds and adjusts the fast
charge current back up in small steps up to the full fast
charge current level or until an equilibrium current is
discovered and maximized for the given ambient tem-
perature condition. In this manner, the thermal loop
controls the system charge level. The AAT3673 will
always provide the highest possible level of constant
current in the fast charge mode for any given ambient
temperature condition.
The required ballast resistor value can be estimated
using the following formulas:
Programmable Watchdog Timer
When connecting to the adapter supply with a red LED:
The AAT3673 contains a watchdog timing circuit which
operates in all charging modes. Typically a 0.1μF ceram-
ic capacitor is connected between the CT pin and ground.
When a 0.1μF ceramic capacitor is used, the device will
time a shutdown condition if the trickle charge mode
exceeds 50 minutes. When the device transitions from
the trickle charge to the fast charge constant current
mode and then to the constant voltage mode, the timer
counting is continuous but the timeout value changes
from 50 minutes to 7 hours.
VADP - VFLED
RB(STAT1,2)
=
ILED(STAT1,2)
Example:
5.5V - 2.0V
2mA
RB(STAT1,2)
=
= 1.75kΩ
Red LED forward voltage (VF) is typically 2.0V @ 2mA.
When connecting to the USB supply with a green LED:
Summary for a 0.1μF used for the timing capacitor:
VUSB - VFLED
ILED(STAT1,2)
RB(STAT1,2)
=
Trickle Charge (TC) time out = 50 minutes
Trickle Charge (TC) + Fast Charge Constant Current (CC)
+ Constant Voltage (CV) mode time out = 7 hours
Example:
5.0V - 3.2V
2mA
RB(STAT1,2)
=
= 900Ω
The CT pin is driven by a constant current source and
will provide a linear response to increases in the timing
capacitor value. Thus, if the timing capacitor were to be
doubled from the nominal 0.1μF value, the time out time
of the CC + CV modes would be doubled. The corre-
sponding trickle charge time out time would be the com-
bined CC + CV time divided by 8.
Green LED forward voltage (VF) is typically 3.2V @ 2mA.
Protection Circuitry
Thermal Loop Control
Due to the integrated nature of the linear charging con-
trol pass devices for both the adapter and USB modes,
a special thermal loop control system has been employed
to maximize charging current under all operating condi-
tions.
If the programmable watchdog timer function is not
needed it may be disabled by terminating the CT pin to
ground. The CT pin should not be left floating or not
terminated; this will cause errors in the internal timing
control circuit.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
The counter input frequency will be divided by two in the
Capacitor Selection
event of a fault condition. Such fault conditions include
digital thermal loop charge current reduction, battery
charge reduction, and battery current sharing with the
output during the charging cycle. When the fault condition
recovers, the counter will resume the timing function.
Input Capacitor
A 1μF or larger capacitor is typically recommended for
C
ADP. CADP should be located as close to the device ADP
pin as practically possible. Ceramic, tantalum, or alumi-
num electrolytic capacitors may be selected for CADP
.
The charge timer will automatically reset when the
AAT3673 enable pin is reset or cycled off and on. 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 determined by
the capacitance value, a 10% tolerance or better ceram-
ic capacitor is recommended. Ceramic capacitor materi-
als such as X7R and X5R type are a good choice for this
application.
There is no specific capacitor equivalent series resistance
(ESR) requirement for CADP. However, for higher current
operation, ceramic capacitors are recommended for CADP
due to their inherent capability over tantalum capacitors
to withstand input current surges from low impedance
sources such as batteries in portable devices.
Typically, 50V rated capacitors are required for most of
the application to prevent any surge voltage. Ceramic
capacitors selected as small as 1206 are available which
can meet these requirements. Other voltage rating
capacitor can also be used for the known input voltage
application.
Battery Over-Voltage Protection
Charger Output Capacitor
An over-voltage event is defined as a condition where
the voltage on the BAT pin exceeds the maximum bat-
tery charge voltage and is set by the over-voltage pro-
tection threshold (VBOVP). If an over-voltage condition
occurs, the AAT3673 charge control will shutdown the
device until voltage on the BAT pin drops below the over-
voltage protection threshold (VBOVP). The AAT3673 will
resume normal charging operation once the battery
over-voltage condition is removed.
The AAT3673 only requires a 1μF ceramic capacitor on
the BAT pin to maintain circuit stability. This value should
be increased to 10μF or more if the battery connection is
made any distance from the charger output.
System Power Output Capacitor
For proper load voltage regulation and operational stabil-
ity, a capacitor is required between OUT and GND. The
output capacitor connection to the ground pin should be
made as directly as practically possible for maximum
device performance. Since the regulator has been
designed to function with very low ESR capacitors, a 10μF
ceramic capacitor is recommended for best performance.
Over-Temperature Shutdown
The AAT3673 has a thermal protection control circuit
which will shut down charging functions should the inter-
nal die temperature exceed the preset thermal limit
threshold. Thermal shutdown also turns off the switches
from ADP to OUT and BAT to OUT.
Printed Circuit Board
Layout Recommendations
Battery Temperature Fault Monitoring
For proper thermal management and to take advantage
of the low RDS(ON) of the AAT3673, a few circuit board
layout rules should be followed: IN and BAT should be
routed using wider than normal traces, and GND should
be connected to a ground plane. To maximize package
thermal dissipation and power handling capacity of the
AAT3673 TDFN4x4 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. If heat
is still an issue, multi-layer boards with dedicated ground
planes are recommended. Also, adding more thermal
vias on the thermal landing would help transfer heat to
the PCB effectively.
In the event of a battery over- or under-temperature
condition, the charge control will turn off the internal
charge path regulation device and disable the BAT-OUT
dynamic path. After the system recovers from a tem-
perature fault, the device will resume charging opera-
tion. The AAT3673 checks battery temperature before
starting the charge cycle, as well as during all stages of
charging. Typically, batteries employ the use of a nega-
tive temperature coefficient (NTC) thermistor that is
integrated into the battery.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Figure 4: AAT3673-1/-2/-4/-5 Evaluation
Board Top Layer.
Figure 5: AAT3673-1/-2/-4/-5 Evaluation
Board Bottom Layer.
Figure 6: AAT3673-3/-6 Evaluation
Board Top Layer.
Figure 7: AAT3673-3/-6 Evaluation
Board Bottom Layer.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
D1
U1
TDFN44-16
Green LED
5V
+5V
OUT
4
15
STAT1
OUT
R5 1.5K
D2
C5
Red LED
10μF
5
STAT2
11
10
BAT
BAT
R6 1.5K
BAT
TS
J1
3
C2
10μF
2
1
7
9
8
2
1
EN
BYP
R7
AAT3673-1/-2/-4/-5
J2
EN
3
2
1
10K
ENBAT
TS
14
16
J3
ENBAT
3
2
1
ENO
CT
BYP
ENO
ADP
R3
R4
ADP
12
3
CHRADP
ADPSET
R8
10K
C4
0.1μF
13
TERM
BYP
GND
6
C1
10μF
C3
R2
R1
10μF
Figure 8: AAT3673-1/-2/-4/-5 Evaluation Board Schematic.
U1
TDFN44-16
OUT
D1
+5V
Green LED
5V
OUT
4
15
STAT1
R5 1.5K
C5
10μF
J1
3
2
1
11
10
BAT
BAT
7
5
EN1
EN2
BAT
TS
J2
3
EN1
C2
10μF
2
1
BYP
AAT3673-3/-6
J3
EN2
R6
10K
3
2
1
9
ENBAT
14
16
TS
J4
ENBAT
3
2
1
8
ENO
CT
BYP
ENO
2
ADP
R3
R4
ADP
12
3
CHRADP
BYP
C4
0.1μF
1
ADPSET
TERM
R7
10K
13
C1
10μF
GND
6
C3
R1
R2
10μF
Figure 9: AAT3673-3/-6 Evaluation Board Schematic.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Component
Part Number
Description
Manufacturer
U1
R1
R2
R5, R6
R7, R8
C4
AAT3673-1/-2/-4/-5IXN 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN4x4-16 Package
Skyworks
Chip Resistor
Chip Resistor
Chip Resistor
57.6kꢁ, 1%, 1/4W; 0603
71.5kꢁ, 5%, 1/4W; 0603
1.5kΩ, 5%, 1/4W; 0603
10kΩ, 5%, 1/4W; 0603
0.1ꢀF 10V 10% X5R 0603
10ꢀF 10V 10% X7R 0805
Conn. Header, 2mm zip
Green LED; 0603
Vishay
Chip Resistor
GRM188R61A225KE34
C1, C2, C3, C5 GRM21BR71A106KE51L
J1, J2, J3
D1
PRPN401PAEN
LTST-C190GKT
LTST-C190CKT
Sullins Electronics
Lite-On Inc.
D2
Red LED; 0603
Table 9: AAT3673-1/-2/-4/-5 Evaluation Board Bill of Materials (BOM).
Component
Part Number
Description
Manufacturer
U1
R1
AAT3673-3/-6IXN
Chip Resistor
1.6A Linear Li-Ion/Polymer Battery Charger in TDFN4x4-16 Package
57.6kΩ, 1%, 1/4W; 0603
Skyworks
R2
R5
Chip Resistor
Chip Resistor
71.5kΩ, 5%, 1/4W; 0603
1.5kΩ, 5%, 1/4W; 0603
Vishay
R6, R7
C4
Chip Resistor
GRM188R61A225KE34
10kΩ, 5%, 1/4W; 0603
0.1ꢀF 10V 10% X5R 0603
10ꢀF 10V 10% X7R 0805
Murata
C1, C2, C3, C5 GRM21BR71A106KE51L
J1, J2, J3, J4
D1
PRPN401PAEN
LTST-C190GKT
Conn. Header, 2mm zip
Sullins Electronics
Lite-On Inc.
Green LED; 0603
Table 10: AAT3673-3/-6 Evaluation Board Bill of Materials (BOM).
Constant Voltage
Regulation
(V)
OVP Trip
Point
OVP Turn On
Delay Time
(μs)
Preconditioning
Voltage Threshold
(V)
Number of
Status Pins Enable Pins
Number of
Product
(V)
AAT3673-1
AAT3673-2
AAT3673-3
AAT3673-4
AAT3673-5
AAT3673-6
4.2
4.2
4.2
4.2
4.2
4.2
6.75
6.75
6.75
6.75
6.75
6.75
130
130
130
80,000
80,000
80,000
2.9
2.9
2.9
2.9
2.9
2.9
2; see Table 6 1; see Table 1
2; see Table 7 1; see Table 1
1; see Table 8 2; see Table 2
2; see Table 6 1; see Table 1
2; see Table 7 1; see Table 1
1; see Table 8 2; see Table 2
Table 11: AAT3673 Options.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TDFN44-16
TDFN44-16
TDFN44-16
TDFN44-16
TDFN44-16
TDFN44-16
9SXYY
9XXYY
8SXYY
AAT3673IXN-4.2-1-T1
AAT3673IXN-4.2-2-T1
AAT3673IXN-4.2-3-T1
AAT3673IXN-4.2-4-T1
AAT3673IXN-4.2-5-T1
AAT3673IXN-4.2-6-T1
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.
Packaging Information
TDFN44-163
Index Area
(D/2 x E/2)
Detail "B"
0.3 0.10
0.375 0.125
0.16
0.075 0.075
0.1 REF
Detail "A"
4.00 0.05
2.60 0.05
Pin 1 Indicator
(optional)
Top View
Bottom View
7.5° 7.5°
Detail "B"
Option A:
C0.30 (4x) max
Chamfered corner
Option B:
R0.30 (4x) max
Round corner
0.05 0.05
Side View
Detail "A"
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Sky-
works may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided here-
under, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR
PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES
NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, IN-
CLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM
THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or en-
vironmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of pub-
lished parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
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