AAT3673 - Skyworks Solutions, Inc.

DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
General Description
Features
The AAT3673 BatteryManager is a highly integrated single-cell (4.2V) lithium-ion/polymer battery charger and
system power management IC that enables simultaneous 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
• System Load Current Limiting
• 16-pin 4 × 4mm TDFN Package
The AAT3673 provides charging current and system
power management from a single input that may be supplied 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 termination current is also user-programmable.
The AAT3673 employs a battery charge current reduction 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 thermal loop which allows the maximum possible charging
current for any given ambient temperature condition.
Battery temperature, voltage and charge state are monitored 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.
Applications
•
•
•
•
•
•
Cellular Phones
Digital Still Cameras
Digital Video Cameras
Global Positioning Systems (GPS)
MP3 Players
Handheld PCs
The AAT3673 is available in a Pb-free, thermally
enhanced, space-saving 16-pin 4 × 4mm TDFN package.
Typical Application
System Load
STAT2
Adapter Input
ADP
BYP
CADP
10μF
CBAT
10μF
Enable Battery to Out
RTERM
TS
ENO
Enable Battery to Out
CHR Threshold
ENBAT
CT
TERM
RADP
Battery
Pack
CHRADP
ADPSET
Temp
Enable Input to Output
CHR Threshold
ENBAT
EN2
TS
ENO
CBAT
10μF
BYP
10kΩ
EN2
Temp
Enable Input to Output
AAT3673-3/-6
EN1
10kΩ
EN
BAT
EN1
AAT3673-1/-2/-4/-5
Enable
BAT+
ADP
BAT
Adapter Input
OUT
STAT1
BAT+
CADP
10μF
System Load
OUT
STAT1
CHRADP
ADPSET
BYP
TERM
GND
CBYP
CT
RADP
RTERM
Battery
Pack
CT
BYP
GND
CBYP
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
CT
1
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Pin Descriptions
Pin #
Name
Type
1
ADPSET
I
2
ADP
I
3
BYP
I
4
STAT1
O
STAT2
O
EN2
I
GND
I/O
EN
I
EN1
I
8
ENO
I
9
ENBAT
I
10, 11
BAT
I/O
12
CHRADP
I
13
TERM
I
14
TS
I
15
OUT
O
16
CT
I
EP
EP
I/O
5
6
7
2
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 capacitor as close as possible between ADP and GND.
Input for the over-voltage protection bypass node. Connect a 1μF (minimum) ceramic capacitor between this pin and GND.
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 status 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.
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.
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).
Battery load switch enable, active low. Battery load switch control the power path between the battery cell and OUT (internal pull-up).
Battery pack (+) connection. For best operation, a 1μF (minimum) ceramic capacitor should be
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.
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, connect 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.
Battery charge timer input pin, connect a capacitor on this pin to set the ADP charge timers. Typically, a 0.1μF ceramic capacitor is connected between this pin and GND. To disable the timer circuit
function, connect this pin directly to GND.
Exposed paddle (package bottom). Connect to GND plane under the device.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Pin Configuration
TDFN44-16
(Top View)
AAT3673-1/-2/-4/-5
ADPSET
ADP
BYP
STAT1
STAT2
GND
EN
ENO
1
16
2
15
3
14
4
13
5
EP
12
6
11
7
10
8
9
CT
OUT
TS
TERM
CHRADP
BAT
BAT
ENBAT
AAT3673-3/-6
ADPSET
ADP
BYP
STAT1
EN2
GND
EN1
ENO
1
16
2
15
3
14
4
5
EP
13
12
6
11
7
10
8
9
CT
OUT
TS
TERM
CHRADP
BAT
BAT
ENBAT
Absolute Maximum Ratings
Symbol
VIN
VP
Description
ADP Continuous
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)
VN
TJ
TA
TLEAD
Value
30
-0.3 to 8
-0.3 to 8
-0.3 to 8
-40 to 150
-25 to 85
300
Units
V
°C
Thermal Information1, 2
Symbol
θJA
θJC
PD
Description
Maximum Thermal Resistance
Maximum Thermal Resistance
Maximum Power Dissipation
Value
46
26
2.0
Units
°C/W
W
1. Mounted on 1.6mm thick FR4 circuit board.
2. Derate 50mW/°C above 25°C ambient temperature.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
3
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
Operation
VOVP
VADP
VBAT
Conditions
Input Over Voltage Protection Range
AC Adapter / USB Operating Voltage Range
Battery Operating Voltage Range
VOUT
ADP to OUT Voltage Regulation
VDO
ADP to OUT Regulator Dropout1
VUVLO_ADP
ADP Under-Voltage Lockout
VUVLO_BAT
BAT Under-Voltage Lockout
IADP_OP
ADP Normal Operating Current
ADP Shutdown Mode Current
(OVP is Still Active)
IADP_SHDN
IBAT_OP
Battery Operating Current
IBAT_SLP
Battery Sleep Current
IBAT_SHDN
Leakage Current from BAT Pin
Over-Voltage Protection
VOVPT
Over-Voltage Protection Trip Voltage
Dropout Voltage Between ADP and BYP Pins
VDO_OVP
TRESPOV
Over-Voltage Protection Response Time
Options -1, -2, -3
TOVPON_130μs
OVP Switch Release Delay Time
TOVPSTARTON_130μs
OVP Switch Start Up Delay Time
VADP = 5V, IOUT = 100mA, TA = 25°C
VADP = 4.8V to 6.5V, IOUT = 0mA to
400mA, TA = -25°C to +85°C
IOUT = 400mA
Rising Edge
Hysteresis
Rising Edge
Hysteresis
VADP = 5V, VEN = 0V, ICC = 1A
VADP = 5V, VEN = 5V, VENBAT = 5V,
No Load
VBAT = VCO(REG), VADP = VENBAT = GND
No Load
VBAT = VCO(REG), VADP = 5V,
VEN = VENBAT = 5V
VBAT = VCO(REG), VENBAT = VADP = 5V
VADP Rising Edge
Hysteresis
VADP = 5V, IADP = 500mA
Step up VADP from 6V to 8V
Min
Typ
Max
28
6.5
4.0
3.0
4.33
4.40
VCO(REG)
4.47
4.26
4.4
4.54
150
3.1
0.1
2.9
0.1
0.8
250
3.9
2.8
Units
3.0
1.6
V
mV
V
mA
360
100
250
5
10
μA
2
6.5
VADP voltage step down from 8V to
6V, RLOAD = 100Ω, CBYP = 1μF
VADP voltage step up from 0V to
5V, RLOAD = 100Ω, CBYP = 1μF
6.75
100
100
0.5
7.0
200
V
mV
μs
130
μs
150
Options -4, -5, -6
TOVPON_80ms
OVP Switch Release Delay Time
TOVPSTARTON_80ms
OVP Switch Start Up Delay Time
Power Switches
ADP-to-OUT FET On Resistance
RDS(ON)_SWA
RDS(ON)_SWB
BAT-to-OUT FET On Resistance
RDS(ON)_CHA
ADP Battery Charging FET On-Resistance
Battery Charge Voltage Regulation
Output Charge Voltage Regulation
VCO(REG)
Preconditioning Voltage Threshold
VMIN
VRCH
VADP voltage step down from 8V to
6V, RLOAD = 100Ω, CBYP = 1μF
VADP voltage step up from 0V to
5V, RLOAD = 100Ω, CBYP = 1μF
Default ADP Charge Reduction Threshold
VCHR_REG
CHRADP Pin Voltage Accuracy
ms
80
VADP = 5.0V
VBAT = 4.1V
VADP = 5.0V
600
60
600
4.158
2.8
VCO(REG)
- 0.17
Battery Recharge Voltage Threshold
VCHR_TH
80
CHRADP Open; Reduce Charge
Current When ADP is Below VCHR_TH
VADP = 4.5V
4.20
2.9
VCO(REG)
- 0.1
mΩ
4.242
3.0
VCO(REG)
- 0.05
4.5
1.9
2.0
2.1
1. VDO is defined as VADP - VOUT when VOUT is 98% of normal.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
V
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
ADP Current Limit (Fixed)
ILIM_ADP
BAT_OUT Current Limit (Fixed)
ILIM_BAT
ICH_CC_ADP
ADP Charge Constant Current Charge Range
ΔICH_CC_ADP/
Constant Current Charge Current Regulation Tolerance
ICH_CC_ADP
ICH_TKL_ADP
Conditions
ICH_CC_ADP = 1A
Min
TC
TTKL
Output Low Voltage
Fast Charge (Trickle Charge + Constant Current +
Constant Voltage Charges Together) Timeout
Trickle Charge Timeout
VOVP
Battery Over-Voltage Protection Threshold
IOCP
TS1
TS2
Battery Charge Over-Current Protection Threshold
High Temperature Threshold
Low Temperature Threshold
Digital Thermal Loop Entry Threshold
Digital Thermal Loop Exit Threshold
Digital Thermal Loop Regulated Temperature
TLOOP_IN
TLOOP_OUT
TLOOP_REG
TSHDN
Chip Thermal Shutdown Temperature
Units
1600
mA
-12
12
%
A
%
ICH_CC_ADP
10
VADPSET
VTERM
VSTATx
Max
1.6
2.3
100
ADP Trickle Charge Current
ADPSET Pin Voltage Regulation
TERM Pin Voltage Regulation
Constant Current Charge Current Set Factor: ICH_ADP/
KI_CC_ADP
IADPSET
KI_TERM
Termination Current Set Factor: ICH_TERM/ITERM
AAT3673-3 Only
ICH_LO
USB Low Level Charge Current (Fixed)
USB High Level Charge Current (Fixed)
ICH_HI
Logic Control/Protection
Input High Threshold
VEN
Input Low Threshold
Typ
2
2
V
29300
2000
VEN1 = VEN2 = 0
VEN1 = 0; VEN2 = 5V
85
450
100
500
mA
1.6
0.4
STATx Pin Sinks
8mA
CCT = 0.1μF
7
VCO(REG)
+ 0.1
In All Modes
Threshold
Threshold
Threshold
Hysteresis
V
0.4
28
58
TC/8
VCO(REG)
+ 0.15
100
30
60
115
95
100
140
15
Hour
Min
VCO(REG)
+ 0.2
% ICH_CC
32
62
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
V
% VBYP
°C
5
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
1.2
Constant Current
Pre-Conditioning
IQ (mA)
1.1
1.0
0.9
0.8
0.7
10
100
1000
Constant Charge Current vs. RADP
Constant Charge Current (mA)
Adapter Supply Operating Current vs. RADPSET
10000
Constant Current
Pre-Conditioning
1000
100
10
1
10
100
RSET (kΩ)
RADP (kΩ)
Output Charge Voltage Regulation
Accuracy vs. Adapter Voltage
Constant Output Charge Voltage
vs. Temperature
(VCO(REG) = 4.2V)
4.201
Battery Voltage (V)
0.25
Accuracy (%)
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
4.200
4.199
4.198
4.197
4.196
4.195
-0.20
4.194
-0.25
4.193
-25
5
5.25
5.5
5.75
6
6.25
6.5
-15
-5
5
25
35
45
55
65
75
85
Operating Current vs. Temperature
6.0
0.90
5.8
0.88
5.6
0.86
0.84
5.4
IOP (mA)
Battery Sleep Current (μA)
Battery Sleep Current vs. Temperature
5.2
5.0
4.8
0.82
0.80
0.78
4.6
0.76
4.4
0.74
4.2
0.72
-15
-5
5
15
25
35
45
Temperature (°°C)
6
15
Temperature (°°C)
VADP (V)
4.0
-25
1000
55
65
75
85
0.70
-25
-15
-5
5
15
25
35
45
55
Temperature (°°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
65
75
85
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Constant Charging Current
vs. Adapter Voltage
Charging Current vs. Battery Voltage
1200
1100
Chargin Current (mA)
Constant Charging Current (mA)
Typical Characteristics
1050
1000
950
900
850
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.1V
800
750
700
4
4.25
4.5
4.75
5
5.25
5.5
5.75
6
6.25
1A
500mA
100mA
1000
800
600
400
200
0
2.5
6.5
2.75
3
Preconditioning Voltage Threshold
vs. Temperature
Battery Voltage (V)
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
3.5
3.75
4
4.25
4.5
Battery Voltage (V)
55
65
75
85
Constant Charging Current (mA)
Adapter Voltage (V)
3.25
Preconditioning Voltage Threshold
vs. Adapter Voltage
2.94
2.93
2.92
2.91
2.90
2.89
2.88
2.87
2.86
4.5
4.75
5
Temperature (°°C)
5.25
5.5
5.75
6
6.25
6.5
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
Adapter Current (A)
Battery Voltage (V)
2.0
4.14
4.12
4.10
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
IADP
IBAT
0.2
4.08
-40
0.0
-15
10
35
Temperature (°°C)
60
85
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Output Current (A)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
7
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
(1A Charging Setting)
ADP Voltage
(top) (V)
4
500mA
0
500mA
1A
4
0
1A
0
Time
Time
Over-Voltage Trip Voltage
vs. Temperature
Over-Voltage Trip Voltage
Accuracy vs. Temperature
6.80
0.50
6.79
0.40
0.30
6.78
Accuracy (%)
Adapter Voltage (V)
0
5
4.5
ADP Voltage
(top) (V)
5
4.5
6.77
6.76
6.75
6.74
6.73
0.20
0.10
0.00
-0.10
-0.20
6.72
-0.30
6.71
-0.40
6.70
-25
-15
-5
5
15
25
35
45
55
65
75
-0.50
-25
85
-15
-5
Temperature (°°C)
15
25
35
45
55
65
75
85
LDO Dropout Voltage vs. Load Current
1.00
450
Full Charge
Trickle Charge
0.90
0.80
400
350
0.70
VDO (mV)
Capacitance (μF)
5
Temperature (°°C)
CT Pin Capacitance vs. Counter Timeout
0.60
0.50
0.40
0.30
300
250
200
150
0.20
100
0.10
50
0.00
85°C
25°C
-40°C
0
0
1
2
3
4
Time (hours)
8
ADP Charge Current (middle)
ADP Peripheral Current (bottom)
(0.5A/div)
ADP Charge Current
ADP Charge Current (middle)
ADP Peripheral Current (bottom)
(0.5A/div)
ADP Charge Current
(500mA Charging Setting)
5
6
7
0
200
400
600
800
Load Current (A)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
1000
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
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
70
500
60
Magnitude (dB)
Noise (μVRMS)
Typical Characteristics
400
300
200
100
50
40
30
20
10
0
100
1000
10000
100000
0
100
1000000
1000
Frequency (Hz)
ADP to BYP RDS(ON) vs. Battery Voltage
100
350
85°C
25°C
-25°C
90
80
300
RDS(ON) (mΩ)
BAT to OUT RDS(ON) (mΩ)
100000
Frequency (Hz)
BAT to OUT RDS(ON) vs. Battery Voltage
70
60
50
40
250
200
150
100
85°C
25°C
-25°C
50
30
20
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4
4.1
0
4.5
4.2
4.75
5
5.25
VBAT (V)
ADP to Bypass RDS(ON) (mΩ)
70
60
50
40
30
20
10
-15
-5
5
15
25
35
5.75
6
6.25
6.5
ADP to BYP RDS(ON) vs. Temperature
80
0
-25
5.5
VBAT (V)
BAT to OUT RDS(ON) vs. Temperature
BAT to OUT RDS(ON) (mΩ)
10000
45
Temperature (°C)
55
65
75
85
350
300
250
200
150
100
50
0
-25
-15
-5
5
15
25
35
45
55
65
75
85
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
9
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
High Temperature Threshold
Low Temperature Threshold
(VADP = 5V)
(VADP = 5V)
32
62
31.5
61.5
Low Temperature
Threshold, TS2 (%)
High Temperature
Threshold, TS1 (%)
Typical Characteristics
31
30.5
30
29.5
29
28.5
28
-25
-15
-5
5
15
25
35
45
55
65
75
61
60.5
60
59.5
59
58.5
58
-25
85
-15
-5
5
Temperature (°°C)
-25°C
25°C
85°C
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
5
5.25
5.5
5.75
35
45
55
65
75
85
Input Low Threshold vs. Adapter Voltage
6
6.25
6.5
VEN1(L); VEN2(L); VENO(L); VENBAT(L) (V)
VEN1(H); VEN2(H); VENO(H); VENBAT(H) (V)
1.4
4.75
25
Temperature (°°C)
Input High Threshold vs. Adapter Voltage
4.5
15
1.4
-25°C
25°C
85°C
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
VADP (V)
ADP to OUT RDS(ON) vs. Temperature
OVP Switch Turn-On Time
(VADP = 6.75V → 5V; VOVPT = 6.75V; ICH = 1A)
12
VADP, VBYP (2V/div)
500
400
300
200
100
0
-25
-15
-5
5
15
25
35
45
Temperature (°C)
10
4
VADP
VBYP
ICH
10
55
65
75
8
3.5
3
6
2.5
4
2
2
1.5
0
1
-2
0.5
-4
0
85
Time (100μs/div)
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ICH (A)
ADP to OUT RDS(ON) (mΩ)
600
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)
8
VADP
VBYP
ICH
4
12
3.5
10
3
2.5
4
2
2
1.5
8
4
VADP
VBYP
ICH
3.5
3
6
2.5
4
2
2
1.5
0
1
0
1
-2
0.5
-2
0.5
-4
0
-4
0
ICH (A)
6
ICH (A)
VADP, VBYP (2V/div)
10
VADP, VBYP (2V/div)
12
Response of Out when Switching from VBAT to VADP
Response of Out when Switching from VADP to VBAT
(VADP = 0V → 5V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 0V; ENO = 0V; COUT = 10μF)
(VADP = 5V → 0V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 0V; ENO = 0V; COUT = 10μF)
8
7
6
4.2
VADP
VOUT
VBAT
4.1
4
5
3.9
4
3.8
3
3.7
2
3.6
1
3.5
0
3.4
VADP, VOUT, VBAT (2V/div)
Time (5μs/div)
VADP, VOUT, VBAT (2V/div)
Time (1μs/div)
4.2
8
VADP
VOUT
VBAT
7
6
4.1
4
5
3.9
4
3.8
3
3.7
2
3.6
1
3.5
0
3.4
Time (100μs/div)
Time (200μs/div)
(VADP = 5V → 0V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 5V; ENO = 0V; COUT = 10μF)
8
4.2
VADP
VOUT
VBAT
7
6
4.1
4
5
3.9
4
3.8
3
3.7
2
3.6
1
3.5
0
3.4
Time (200μs/div)
VADP, VOUT, VBAT (2V/div)
Response of Out when Switching from VADP to VBAT
(VADP = 0V→ 5V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 5V; ENO = 0V; COUT = 10μF)
VADP, VBAT, VOUT (2V/div)
Response of Out when Switching from VBAT to VADP
4.2
8
VADP
VOUT
VBAT
7
6
5
4.1
4
3.9
4
3.8
3
3.7
2
3.6
1
3.5
0
3.4
Time (1ms/div)
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11
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Response of Out when ENO = 5V
(VADP = 5V → 0V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 0V; COUT = 10μF)
VADP, VOUT, VBAT (2V/div)
8
4.2
VADP
VOUT
VBAT
7
6
4.1
4
5
3.9
4
3.8
3
3.7
2
3.6
1
3.5
0
3.4
VADP, VOUT, VBAT (2V/div)
Response of Out when ENO = 5V
(VADP = 0V → 5V; VBAT = 3.6V; RLOAD = 50Ω;
ENBAT = 0V; COUT = 10μF)
8
4.2
VADP
VOUT
VBAT
7
6
3.9
4
3.8
3
3.7
2
3.6
1
3.5
0
3.4
Response of Out when Removing Battery
(VBAT = 0V → 3.6V; VADP = 5V; RLOAD = 50Ω;
ENBAT = 0V; ENO = 0V; COUT = 10μF)
(VBAT = 4.1V → 0V; VADP = 5V; RLOAD = 50Ω;
ENBAT = 0V; ENO = 5V; COUT = 10μF)
8
VADP
VOUT
VBAT
5
4
3
2
1
VADP, VOUT, VBAT (2V/div)
VADP, VOUT, VBAT (2V/div)
Time (1ms/div)
Response of Out when Inserting Battery
6
8
6
5
4
3
2
1
Time (200μs/div)
Time (500μs/div)
Response of Out when Inserting Battery
Response of Out when Removing Battery
(VBAT = 0V → 3.6V; RLOAD = 50Ω; VADP = 5V;
ENBAT = 5V; ENO = 0V; COUT = 10μF)
(VBAT = 4.1V → 0V; VADP = 5V; RLOAD = 50Ω;
ENBAT = 5V; ENO = 0V; COUT = 10μF)
8
8
VADP
VOUT
VBAT
7
6
5
4
3
2
1
0
VADP, VOUT, VBAT (2V/div)
VADP, VOUT, VBAT (2V/div)
VADP
VOUT
VBAT
7
0
0
VADP
VOUT
VBAT
7
6
5
4
3
2
1
0
Time (200μs/div)
12
4
5
Time (1ms/div)
7
4.1
Time (500μs/div)
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Functional Block Diagram
BYP
ADP to OUT Switch
OUT
ADP
ADP to BAT
Sw itch
EN/EN1
ENO
ENBAT
BAT to OUT
Switch
OVP
Sense
And
Control
BAT
CT
TERM
Charge
System
Control
TS
Voltage
Sense
ADPSET
CHRADP
STAT1
STAT2/EN2
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 battery 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 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 additional load switches to control and route input power to
supply the system load and manage power from the battery 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.
Thermal and
Current Sense
Ref.
GND
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.
The system load current drawn from the battery is limited 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 automatically switch to a constant voltage mode until the charge
current is reduced to the programmed charge termination current threshold.
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13
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
The internal arrangement of load switches and the charge
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 support 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 programmed 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 current 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.
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 threshold. In the event of an internal over-temperature condition 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 charging current for the given set of input to output power
dissipation and ambient temperature conditions.
14
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.
Battery temperature and charge state are fully monitored 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) internally 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 several conditions in order to assure a safe charging environment. 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 preconditioning voltage threshold (VMIN), the AAT3673 begins preconditioning the battery cell with charge current which is
10% of the fast charge current.
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Fast Charge/Constant Current Charging
Battery cell preconditioning continues until the voltage
measured by the internal sense circuit exceeds the preconditioning voltage threshold (VMIN). At this point, the
AAT3673 begins the fast charge constant current phase.
The fast charge constant current (ICH_CC) level is programmed by the user via the RADP resistor. The AAT3673
remains in constant current charge mode until the battery reaches the voltage regulation point, VCO(REG). The
formula for fast charge current as a function of current
setting resistor is:
2V
ICH_CC = KI_CC_ADP · R
ADP
Battery
UVLO
Trickle
Charge
Constant Current
Charge Phase (CC)
Alternately, to select the resistor value for a given
charging current use:
2V
RADP = KI_CC_ADP · I
CH_CC
where KI_CC_ADP = 29300 (typical).
Constant Voltage Charging
The charge control system transitions to a regulated constant 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 battery cell under charge reaches its maximum capacity.
Constant Voltage
Charge Phase (CV)
Constant Current
Charge Phase
Constant Voltage
Charge Phase
Recharge Phase
I CH_CC
I CH_ CC
Termination
Phase
Termination
Phase
I CH_ TERM
I CH_ TERM
VCO( REG)
VRCH
VMIN
VUVLO
when
when
VBAT =
VCO( REG)
VBAT =
VCO( REG)
I CH_ TKL
Figure 1: Current vs. Voltage and Charger Time Profile.
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15
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Control Inputs
Pass Devices
EN
ENO
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
EN1
EN2
ENO
ENBAT
ADP-OUT
ADP-BAT
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
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
ON
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
ON
Table 2: AAT3673-3/-6 Battery and Adapter Dynamic Path Control Table.
End of Charge Cycle Termination
and Recharge Sequence
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 termination 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 termination 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.
16
ITERM (mA)
RTERM (kΩ)
320
174
125
95
77
64
58
50
49
42
37
11.0
21.0
30.9
41.2
51.1
61.9
71.5
80.6
90.9
100.0
110.0
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:
2V
ICH_TERM = KI_TERM · R
TERM
or
2V
RTERM = KI_TERM · I
CH_TERM
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 supply 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.
Dynamic Current Regulation
There are two possible configurations where the system
load current and charge current are dynamically controlled. 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,
ICH_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 = 57.6kΩ, 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.
switch and the ADP-OUT switch are all enabled. Under
this condition, the adapter input current is limited internally 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.
ILIM_ADP ≥ ICH_CC + IADP-OUT
For example: If RSET = 57.6kΩ, 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 balance of the current; a system load of 1.8A requires the
battery to supply 0.2A.
Over-Voltage Protection
In normal operation, an N-channel MOSFET acts as a
slew-rate controlled load switch, connecting and disconnecting the power supply from ADP to BYP. A low resistance MOSFET is used to minimize the voltage drop
between the voltage source and the charger and to
reduce the power dissipation. When the voltage on the
input exceeds the over-voltage trip point of 6.75V, the
device turns off the internal switch which disconnects the
charger from the abnormal input voltage, therefore preventing 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.
OVP Under-Voltage Lockout (UVLO)
The AAT3673 OVP circuitry has a fixed 3.1V undervoltage 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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17
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
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.
BYP
AAT3673
BYP
0.60 x VBYP
Battery Cold Fault
TS
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.
For a given target delay time TD (in hours) calculate:
CT =
Battery
Pack
Battery Hot Fault
x V BYP
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
18
cell at 10% of the programmed maximum charge until
VBAT >2.9V. If the cell voltage fails to reach the preconditioning 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 proceeds 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.
(TD · 100nF)
7
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 unterminated, 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 susceptible to noise and changes in capacitance value. Therefore,
the timing capacitor should be physically located on the
printed circuit board layout as close as possible to the CT
pin. Since the accuracy of the internal timer is dominated
by the capacitance value, a 10% tolerance or better
ceramic capacitor is recommended. Ceramic capacitor
materials, such as X7R and X5R types, are a good choice
for this application.
System Operation Flowchart
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
UVLO
VADP > VUVLO
Yes
Power On
Reset
Yes
No
Switch
On
No
Thermal
Loop Enable
Sleep
Mode
No
Enable
Dynamic Charge
VENBAT > VEN
Fault Condition
Monitor
OV, OT, OC
Yes
No
Shutdown
Mode
Device
Temperature
Monitor
TJ > 110°C
No
Yes
Connect
ADP to BAT
and OUT
Yes
Battery
Temperature Sense.
VTS1 < TS < VTS2
Yes
No
Thermal Loop
Current Reduction
Battery
Temperature
Fault
Expire
Power
Share
Charge Timer
(Enable on
Charger reset)
No
Recharge Test
VRCH > VBAT?
No
Current
Limit Test
IOUT > ILIM_ADP
Yes
Reduce
Charging
Current to BAT
Yes
Preconditioning
Test
VMIN > VBAT
IOUT + ICH_CC
> ILIM_BAT?
Low Current
Conditioning
Charge
Yes
Constant Current
Charging Mode
Yes
Constant Voltage
Charge Mode
Set
No
Current
Phase Test
VCO(REG) > VBAT
No
Voltage
Phase Test
ICH_CC > ICH_TERM
No
Yes
Charge
Reduction
Mode
No
Yes
Yes
Charge
Complete
Voltage
Regulation
Enable
Input Voltage
Level Test
VADP < VCHR_TH
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No
19
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Applications Information
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.
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.
BYP
R3
1M
CHRADP
VCH_REG = 2.0
R4
800k
Figure 3: Internal Equivalent Circuit
for the CHRADP Pin.
Charge Reduction
Under normal operation, the AAT3673 should be operated from an adapter power source with a sufficient capacity 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 programmed 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.
Adapter Input Charge
Inhibit and Resume
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 threshold voltage. The ADP charge reduction threshold (VCHR_TH)
may be externally set to a value other than 4.5V by placing 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.
Programming Fast Charge Current
The following equation may be used to approximate the
ADP charge reduction threshold above or below 4.5V:
VCHR_TH =
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 suspend 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 constant current charge level is user programmable
with a set resistor connected between the ADPSET pin
and ground. The accuracy of the constant charge current, as well as the preconditioning trickle charge current, is dominated by the tolerance of the set resistor
used. For this reason, a 1% tolerance metal film resistor
is recommended for the set resistor function. The constant charge current levels from 100mA to 1.6A may be
set by selecting the appropriate value from Table 4.
Charge current setting formula:
ICH_CC_ADP (typ) =
VADP
· KII_CC_ADP
RADP
2.0V
(R4/[R4 + R3])
where R4 and R3 « 500k.
20
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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 (kΩ)
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
Table 4: RADP Values.
Figure 4 shows the relationship of constant charging current and set resistor values for the AAT3673.
Constant Charge Current (mA)
A single cell Li-Ion/Polymer battery should be connected
between BAT input and ground.
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 AAT36732/-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)
Charge State
10000
Pre-Charge
Fast-Charge
Charge Complete
Charge Disabled, Sleep Mode or
Fault Condition
Constant Current
Pre-Conditioning
1000
100
No Battery (with Charge Enabled)
STAT1
STAT2
ON
ON
OFF
ON
OFF
ON
OFF
OFF
Flash (1Hz,
40% duty)
Flash (1Hz,
40% duty)
10
Table 6: AAT3673-1/-4 LED Status Indicators.
1
10
100
1000
10000
Charge State
RADP (kΩ)
Pre-Charge or Fast-Charge
Charge Complete, Charge Disabled, or Sleep Mode
Fault Condition
Figure 4: Constant Charging Current
vs. Set Resistor Values.
No Battery (with Charge Enabled)
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 functionality is identical for all three modes and does not
depend on the EN1 and EN2 enable inputs.
EN1
EN2
Operating Mode
0
0
0
1
1
0
1
1
USB Low, 100mA charging current
USB High, 500mA charging current
Using RADP to program charging
current
Shutdown mode
Table 5: AAT3673-3/-6 Operating Modes.
STAT1
STAT2
ON
OFF
OFF
OFF
OFF
Flash (1Hz,
40% duty)
ON
OFF
Table 7: AAT3673-2/-5 LED Status Indicators.
Charge State
STAT1
Pre-Charge or Fast-Charge
Charge Complete, Charge Disabled, Sleep
Mode, or Fault Condition
No Battery (with Charge Enabled)
ON
OFF
Flash (1Hz,
40% duty)
Table 8: AAT3673-3/-6 LED Status Indicators.
Fault condition can be one of the following:
•
•
•
•
Battery over-voltage (OV)
Battery temperature sense hot or cold
Battery charge timer time-out
Chip thermal shutdown
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21
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
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 switches 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 system design requirements. The LED should be biased with
as little current as necessary to create reasonable illumination; therefore, a ballast resistor should be placed
between the LED cathode and the 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 recommended to exceed 8mA when driving an individual
status LED.
The required ballast resistor value can be estimated
using the following formulas:
When connecting to the adapter supply with a red LED:
RB(STAT1,2) =
VADP - VFLED
ILED(STAT1,2)
Example:
RB(STAT1,2) =
5.5V - 2.0V
= 1.75kΩ
2mA
Red LED forward voltage (VF) is typically 2.0V @ 2mA.
When connecting to the USB supply with a green LED:
RB(STAT1,2) =
VUSB - VFLED
ILED(STAT1,2)
Example:
RB(STAT1,2) =
5.0V - 3.2V
= 900Ω
2mA
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.
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 temperature 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.
Programmable Watchdog Timer
The AAT3673 contains a watchdog timing circuit which
operates in all charging modes. Typically a 0.1μF ceramic 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.
Summary for a 0.1μF used for the timing capacitor:
Trickle Charge (TC) time out = 50 minutes
Trickle Charge (TC) + Fast Charge Constant Current (CC)
+ Constant Voltage (CV) mode time out = 7 hours
Thermal Loop Control
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 corresponding trickle charge time out time would be the combined CC + CV time divided by 8.
Due to the integrated nature of the linear charging control 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 conditions.
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.
Green LED forward voltage (VF) is typically 3.2V @ 2mA.
Protection Circuitry
22
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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
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.
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 ceramic capacitor is recommended. Ceramic capacitor materials such as X7R and X5R type are a good choice for this
application.
Battery Over-Voltage Protection
An over-voltage event is defined as a condition where
the voltage on the BAT pin exceeds the maximum battery charge voltage and is set by the over-voltage protection 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 overvoltage protection threshold (VBOVP). The AAT3673 will
resume normal charging operation once the battery
over-voltage condition is removed.
Over-Temperature Shutdown
The AAT3673 has a thermal protection control circuit
which will shut down charging functions should the internal die temperature exceed the preset thermal limit
threshold. Thermal shutdown also turns off the switches
from ADP to OUT and BAT to OUT.
Battery Temperature Fault Monitoring
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 temperature fault, the device will resume charging operation. 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 negative temperature coefficient (NTC) thermistor that is
integrated into the battery.
Capacitor Selection
Input Capacitor
A 1μF or larger capacitor is typically recommended for
CADP. CADP should be located as close to the device ADP
pin as practically possible. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CADP.
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.
Charger Output Capacitor
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 stability, 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.
Printed Circuit Board
Layout Recommendations
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.
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23
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
24
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
5V
D1
Green LED
+5V
U1
4
D2
Red LED
TDFN44-16
OUT
STAT1
R5 1.5K
5
C5
10μF
STAT2
R6 1.5K
J1
3
2
1
J2
J3
3
2
1
7
BAT
11
BAT
10
BAT
EN
BYP
AAT3673-1/-2/-4/-5
EN
3
2
1
OUT
15
9
ENBAT
C2
10μF
R7
10K
TS
14
CT
16
TS
ENBAT
8
ENO
BYP
ENO
2
ADP
R3
ADP
CHRADP
1
12
ADPSET
R4
C4
0.1μF
13
C1
10μF
TERM
R2
R1
BYP
GND
R8
10K
3
C3
10μF
6
Figure 8: AAT3673-1/-2/-4/-5 Evaluation Board Schematic.
5V
U1
D1
Green LED
+5V
4
TDFN44-16
STAT1
OUT
OUT
15
R5 1.5K
C5
10μF
J1
3
2
1
J2
3
2
1
J3
3
2
1
J4
3
2
1
7
EN1
EN1
5
BAT
11
BAT
10
EN2
BAT
BYP
AAT3673-3/-6
EN2
9
ENBAT
TS
14
CT
16
C2
10μF
R6
10K
TS
ENBAT
8
ENO
BYP
ENO
2
ADP
R3
ADP
CHRADP
1
13
C1
10μF
ADPSET
R4
BYP
TERM
GND
R1
R2
12
6
C4
0.1μF
R7
10K
3
C3
10μF
Figure 9: AAT3673-3/-6 Evaluation Board Schematic.
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25
DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Component
Part Number
Description
Manufacturer
U1
R1
R2
R5, R6
R7, R8
C4
C1, C2, C3, C5
J1, J2, J3
D1
D2
AAT3673-1/-2/-4/-5IXN
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
GRM188R61A225KE34
GRM21BR71A106KE51L
PRPN401PAEN
LTST-C190GKT
LTST-C190CKT
1.6A Linear Li-Ion/Polymer Battery Charger in TDFN4x4-16 Package
57.6kΩ, 1%, 1/4W; 0603
71.5kΩ, 5%, 1/4W; 0603
1.5kΩ, 5%, 1/4W; 0603
10kΩ, 5%, 1/4W; 0603
0.1μF 10V 10% X5R 0603
10μF 10V 10% X7R 0805
Conn. Header, 2mm zip
Green LED; 0603
Red LED; 0603
Skyworks
Vishay
Sullins Electronics
Lite-On Inc.
Table 9: AAT3673-1/-2/-4/-5 Evaluation Board Bill of Materials (BOM).
Component
Part Number
Description
Manufacturer
U1
R1
R2
R5
R6, R7
C4
C1, C2, C3, C5
J1, J2, J3, J4
D1
AAT3673-3/-6IXN
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
GRM188R61A225KE34
GRM21BR71A106KE51L
PRPN401PAEN
LTST-C190GKT
1.6A Linear Li-Ion/Polymer Battery Charger in TDFN4x4-16 Package
57.6kΩ, 1%, 1/4W; 0603
71.5kΩ, 5%, 1/4W; 0603
1.5kΩ, 5%, 1/4W; 0603
10kΩ, 5%, 1/4W; 0603
0.1μF 10V 10% X5R 0603
10μF 10V 10% X7R 0805
Conn. Header, 2mm zip
Green LED; 0603
Skyworks
Vishay
Murata
Sullins Electronics
Lite-On Inc.
Table 10: AAT3673-3/-6 Evaluation Board Bill of Materials (BOM).
Product
Constant Voltage
Regulation
(V)
OVP Trip
Point
(V)
OVP Turn On
Delay Time
(μs)
Preconditioning
Voltage Threshold
(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
Number of
Status Pins
Number of
Enable Pins
2;
2;
1;
2;
2;
1;
1;
1;
2;
1;
1;
2;
see
see
see
see
see
see
Table
Table
Table
Table
Table
Table
6
7
8
6
7
8
Table 11: AAT3673 Options.
26
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see
see
see
see
see
see
Table
Table
Table
Table
Table
Table
1
1
2
1
1
2
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
3.30 ± 0.05
Detail "B"
4.00 ± 0.05
Index Area
(D/2 x E/2)
0.3 ± 0.10
0.375 ± 0.125
0.16
0.075 ± 0.075
0.1 REF
4.00 ± 0.05
2.60 ± 0.05
Top View
Pin 1 Indicator
(optional)
0.23 ± 0.05
Bottom View
0.45 ± 0.05
Detail "A"
0.229 ± 0.051
+ 0.05
0.8 -0.20
7.5° ± 7.5°
0.05 ± 0.05
Detail "B"
Option A:
C0.30 (4x) max
Chamfered corner
Option B:
R0.30 (4x) max
Round corner
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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27
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. Skyworks 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 hereunder, 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, INCLUDING 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 environmental 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 published 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.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201881B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012