AAT3672IWO-4.2-1-T1 [SKYWORKS]
Power Supply Management Circuit, Adjustable, 1 Channel, PDSO14, TDFN-14;
| 型号： | AAT3672IWO-4.2-1-T1 |
| 厂家： | 
SKYWORKS SOLUTIONS INC. |
| 描述： | Power Supply Management Circuit, Adjustable, 1 Channel, PDSO14, TDFN-14 光电二极管 |
| 文件： | 总27页 (文件大小：3933K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
General Description
Features
The AAT3672 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.
• 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
The AAT3672 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. 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.
• 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 AAT3672 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 AAT3672 has a digitally controlled ther-
mal loop which allows the maximum possible charging
current for any given ambient temperature condition.
• System Load Current Limiting
• 14-pin 3 × 3mm 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 AAT3672-1/-2 has two
status monitor output pins (STAT1 and STAT2), and the
AAT3672-3 has one status monitor output (STAT1) pro-
vided to indicate battery charge status by directly driving
external LEDs.
• Handheld PCs
The AAT3672 is available in a Pb-free, thermally
enhanced, space-saving 14-pin 3 × 3mm TDFN package.
Typical Application
System Load
System Load
OUT
STAT1
OUT
BAT
STAT1
STAT2
Adapter Input
BAT+
BAT+
ADP
BAT
CADP
10μF
Adapter Input
Enable
CBAT
10μF
CBAT
10μF
ADP
ADP
ADP
AAT3672-3
CADP
10μF
Enable 1
Enable 2
EN1
EN2
AAT3672-1/-2
10kΩ
10kΩ
EN
Temp
Temp
Enable Input to Output
Enable Battery to Output
Enable Input to Output
Enable Battery to Output
TS
TS
ENO
ENO
Battery
Pack
Battery
Pack
CHR Threshold
CHR Threshold
ENBAT
CHRADP
CT
ENBAT
CHRADP
CT
ADPSET
ADPSET
TERM
TERM
GND
GND
RSET
RTERM
CT
CT
RSET
RTERM
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Pin Descriptions
Pin # Name Type Function
Connect a resistor from this pin to GND 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.
1
2
ADPSET
ADP
I
I
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
ADP.
3
4
STAT1
GND
O
I/O
O
Common ground connection.
AAT3672-1/-2: 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 ADP.
AAT3672-3: The EN2 pin (internal pull-down) is used together with the EN1 pin; see Table 2 in the
"Functional Description" section of this datasheet.
AAT3672-1/-2: Input enable (internal pull-down). High to enable the ADP switch and battery charg-
ing path; low or floating to disable the ADP switch and battery charging function. See Table 1 in the
"Functional Description" section of this datasheet.
STAT2
5
6
EN2
EN
I
I
AAT3672-3: This EN1 pin (internal pull-down) 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
high input (internal pull down).
Battery load switch enable, active high. Battery load switch control the power path between the bat-
tery cell and OUT (internal pull down).
EN1
ENO
I
I
I
7
8
ENBAT
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 a logic high level.
9
CHRADP
TERM
I
I
10
Battery temperature sensing input. For typical applications, connect a 10kΩ resistor from ADP 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 with a 10kΩ resistor between this pin and GND.
11
TS
I
Battery pack (+) connection. For best operation, a 1μF (minimum) ceramic capacitor should be
placed as close as possible between BAT and GND.
System dynamic power output supplied from the ADP input, BAT or both. Connect a 10μF capacitor
between this pin and GND for best system stability. If the system load circuit contains a reasonable
bulk capacitance, the output capacitor value may be reduced.
12
13
BAT
I/O
O
OUT
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.
14
EP
CT
EP
I
I/O
Exposed paddle (package bottom). Connect to GND as closely to the device as possible.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Pin Configuration
TDFN33-14
(Top View)
AAT3672-1/2
AAT3672-3
14
13
12
11
10
9
14
13
12
11
10
9
1
2
3
4
5
6
7
1
2
3
4
5
6
7
ADPSET
ADP
CT
ADPSET
ADP
CT
OUT
OUT
STAT1
GND
BAT
STAT1
GND
BAT
EP
EP
TS
TS
STAT2
EN
TERM
CHRADP
ENBAT
EN2
TERM
CHRADP
ENBAT
EN1
8
8
ENO
ENO
Absolute Maximum Ratings
Symbol
Description
Value
Units
VP
ADP, BAT, OUT <30ms, Duty Cycle < 10%
EN/EN1, ENO, ENBAT, STAT1, STAT2/EN2
TS, CT, ADPSET, TERM, CHRADP
Junction Temperature Range
Maximum Soldering Temperature (at Leads)
Operating Temperature Range
-0.3 to 7.5
-0.3 to 7.5
-0.3 to VP + 0.3
-40 to 150
300
V
VN
TJ
TLEAD
TA
°C
-25 to 85
Thermal Information1, 2
Symbol
Description
Value
Units
θJA
θJC
PD
Maximum Thermal Resistance
Maximum Thermal Resistance
Maximum Power Dissipation
50
37
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
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Electrical Characteristics1
VADP = 5V, TA = -25°C to +85°C; unless otherwise noted, typical values are TA = 25°C.
Symbol Description
Operation
Conditions
Min
Typ
Max
Units
VADP
VBAT
AC Adapter Operating Voltage Range
Battery Operating Voltage Range
4.0
3.0
6.5
VCO(REG)
3.9
Rising Edge
Hysteresis
Rising Edge
Hysteresis
VADP = VEN = 5V, ICC = 1A
VADP = 5V, VEN = 0V, VENBAT = 0V,
No Load
VADP = VEN1 = VEN2 = 5V, VENO
0V, VENBAT = 0V
3.4
0.1
2.9
0.1
0.5
VUVLO_ADP
ADP Under-Voltage Lockout
V
2.8
3.0
VUVLO_BAT
IADP_OP
BAT Under-Voltage Lockout
ADP Normal Operating Current
1
1
mA
IADP_SHDN1/2 ADP Shutdown Mode Current for AAT3672-1/-2
IADP_SHDN3 ADP Shutdown Mode Current for AAT3673-3
=
5
VBAT = VCO(REG), VADP = GND,
VUSB = GND, VENBAT = 5V, No Load
VBAT = VCO(REG), VADP = 5V,
VEN = VENBAT = 5V
VBAT = VCO(REG), VENBAT = 0V
μA
IBAT_OP
Battery Operating Current
60
4
120
IBAT_SLP
Battery Sleep Current
10
1
IBAT_SHDN
Leakage Current from BAT Pin
Power Switches
RDS(ON)_SWA ADP-to-OUT FET On Resistance
RDS(ON)_SWB BAT-to-OUT FET On Resistance
RDS(ON)_CHA ADP Battery Charging FET On Resistance
Battery Charge Voltage Regulation
VADP = 5.0V
VBAT = 4.1V
VADP = 5.0V
600
80
600
mΩ
VCO(REG)
VMIN
Output Charge Voltage Regulation
Preconditioning Voltage Threshold
4.158
2.8
4.20
2.9
4.242
3.0
VCO(REG) VCO(REG) VCO(REG)
VRCH
Battery Recharge Voltage Threshold
- 0.17
- 0.1
- 0.05
V
CHRADP Open; Reduce Charge
Current When ADP is Below
VCHR_TH
VCHR_TH
Default ADP Charge Reduction Threshold
CHRADP and CHRUSB Pin Voltage Accuracy
4.5
VCHR_REG
1.9
2.0
2.1
Current Regulation
ILIM_ADP ADP Current Limit (Fixed)
ILIM_BAT
1.6
2.3
A
BAT_OUT Current Limit (Fixed)
ICH_CC_ADP
ADP Charge Constant Current Charge Range
100
-12
1600
12
mA
ΔICH_CC
/
Constant Current Charge Current
Regulation Tolerance
ICH_CC_ADP = 1A
%
ICH_CC
%
ICH_CC_ADP
ICH_TKL_ADP ADP Charge Trickle Charge
10
VADPSET
VTERM
ADPSET Pin Voltage Regulation
TERM Pin Voltage Regulation
2
2
V
Constant Current Charge Current Set
Factor: ICH_CC_ADP/IADPSET
Termination Current Set Factor:
ICH_TERM/ITERM
KI_CC_ADP
KI_TERM
29300
2000
AAT3672-3 Only
ICH_LO USB Low Level Charge Current (Fixed)
ICH_HI USB High Level Charge Current (Fixed)
VEN1 = VEN2 = 0
VEN1 = 0; VEN2 = 5V
70
400
85
450
100
500
mA
1. The AAT3672 is guaranteed to meet performance specifications over the -25°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Electrical Characteristics (continued)1
VADP = 5V, TA = -25°C to +85°C; unless otherwise noted, typical values are TA = 25°C.
Symbol
Description
Conditions
Min
Typ
Max
Units
Logic Control/Protection
VEN
VEN
VSTATx
Input High Threshold
Input Low Threshold
Output Low Voltage
1.6
0.4
0.4
V
STATx Pin Sinks 8mA
Fast Charge (Trickle Charge + Constant Current +
Constant Voltage Charges Together) Timeout
TC
CCT = 0.1μF
7
hour
TTKL
Trickle Charge Timeout
TC/8
VCO(REG)
+ 0.1
VCO(REG)
+ 0.15
VCO(REG)
+ 0.2
VBOVP
Battery Over-Voltage Protection Threshold
V
%
ICH_CC
IOCP
Battery Charge Over-Current Protection Threshold In All Modes
100
TS1
TS2
High Temperature Threshold
Low Temperature Threshold
28
58
30
60
32
62
% VADP
% VADP
TLOOP_IN
TLOOP_OUT
TLOOP_REG
Digital Thermal Loop Entry Threshold
Digital Thermal Loop Exit Threshold
Digital Thermal Loop Regulated Temperature
Threshold
Chip Thermal Shutdown Temperature
Hysteresis
115
95
100
140
15
ºC
TSHDN
1. The AAT3672 is guaranteed to meet performance specifications over the -25°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Adapter Supply Operating Current vs. RSET
Constant Charge Current vs. RADP
0.8
0.7
0.6
0.5
0.4
0.3
0.2
10000
Constant Current
Pre-Conditioning
1000
100
10
1
Constant Current
0.1
Pre-Conditioning
0.0
10
100
1000
10000
10
100
1000
10000
RSET (kΩ)
RADP (kΩ)
Output Charge Voltage Regulation
Output Charge Voltage vs. Temperature
Accuracy vs. Adapter Voltage
(VCO(REG) = 4.2V)
4.23
0.25
0.2
0.15
0.1
0.05
0
4.22
4.21
4.2
-0.05
-0.1
-0.15
-0.2
-0.25
4.19
4.18
4.17
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
5
4.5
4
0.7
0.65
0.6
0.55
0.5
3.5
3
0.45
0.4
2.5
2
0.35
0.3
-25 -15
-25 -15
-5
5
15
25
35
45
55
65
75
85
-5
5
15
25
35
45
55
65
75
85
Temperature (°C)
Temperature (°C)
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Constant Charging Current
Recharge Voltage Threshold vs. Temperature
(VADP = 5V; RSET = 56.7kΩ)
vs. Adapter Voltage
1.1
4.16
4.14
4.12
4.1
1.05
1
0.95
0.9
0.85
4.08
4.06
4.04
0.8
0.75
0.7
VBAT = 3.6V
VBAT = 3.9V
V
BAT = 4.1V
4
4.5
5
5.5
6
6.5
-25 -15
-5
5
15
25
35
45
55
65
75
85
VADP (V)
Temperature (°C)
Constant Charge Current vs. Temperature
Constant Charge Current vs. Battery Voltage
1100
1200
1000
1A
1000
900
800
700
600
500
400
300
200
100
0
425mA
85mA
1A
425mA
85mA
800
600
400
200
0
-25 -15
-5
5
15
25
35
45
55
65
75
85
2.5
2.9
3.3
3.7
4.1
4.5
Temperature (°C)
Battery Voltage (V)
Preconditioning Voltage Threshold
vs. Adapter Voltage
Preconditioning Voltage Threshold
vs. Temperature
3
3
2.98
2.96
2.94
2.92
2.9
2.98
2.96
2.94
2.92
2.9
2.88
2.86
2.84
2.82
2.8
2.88
2.86
2.84
2.82
2.8
-25 -15
-5
5
15
25
35
45
55
65
75
85
5
5.25
5.5
5.75
6
6.25
6.5
VADP (V)
Temperature (°C)
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Adapter and Charging Current
Adapter and Charging Current vs. Output Current
(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V;
AAT3672-3 VEN1 = VEN2 = 0V)
vs. Output Current
(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V)
1.8
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
IADP
IBAT
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
IADP
IBAT
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Output Current (A)
Output Current (A)
Adapter and Charging Current vs. Output Current
(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V;
AAT3672-3 VEN1 = 0V; VEN2 = 5V)
CT Pin Capacitance vs. Counter Timeout
1
2
Full Charge
0.9
1.8
1.6
1.4
1.2
1
IADP
IBAT
Trickle Charge
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.8
0.6
0.4
0.2
0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0
1
2
3
4
5
6
7
Output Current (A)
Time (hours)
ADP Charge Current
ADP Charge Current
(1A Charging Setting)
(500mA Charging Setting)
5
5
4.5
4
4.5
4
1A
500mA
0
0
1A
500mA
0
0
Time
Time
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
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)
(VADP = 5V→ 0V; VBAT = 3.6V; VENBAT = 5V; VENO = 5V; RLOAD = 50Ω)
7
6
5
4
3
2
7
VADP
6
VBAT
VOUT
5
4
3
2
1
0
1
VADP
VBAT
VOUT
0
-1
-1
Time (200μs/div)
Time (200μs/div)
Response of Out when Switching from VBAT to VADP
Response of Out when Switching from VADP to VBAT
(VADP = 0V→ 5V; VBAT = 3.6V; VENBAT = 0V; VENO = 5V; RLOAD = 50Ω)
(VADP = 5V→ 0V; VBAT = 3.6V; VENBAT = 0V; VENO = 5V; RLOAD = 50Ω)
7
6
5
4
3
2
7
VADP
6
VBAT
VOUT
5
4
3
2
1
0
1
VADP
VBAT
VOUT
0
-1
-1
Time (200μs/div)
Time (200μs/div)
Response of Out when VENO = 0V
Response of Out when VENO = 0V
(VADP = 0V→ 5V; VBAT = 3.6V; VENBAT = 5V; RLOAD = 50Ω)
(VADP = 5V→ 0V; VBAT = 3.6V; VENBAT = 5V; RLOAD = 50Ω)
7
7
6
5
4
3
2
VADP
6
VBAT
VOUT
5
4
3
2
1
1
VADP
VBAT
0
0
-1
VOUT
-1
Time (200μs/div)
Time (200μs/div)
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Response of Out when VENBAT = 0V
Response of Out when VENBAT = 0V
(VBAT = 0V→ 3.6V; VADP = 5V; VENO = 5V; RLOAD = 50Ω)
(VBAT = 3.6V→ 0V; VADP = 5V; VENO = 5V; RLOAD = 50Ω)
7
6
5
4
3
2
7
6
5
4
3
2
1
0
VADP
VBAT
VOUT
1
VADP
VBAT
0
-1
VOUT
-1
Time (200μs/div)
Time (200μs/div)
Response of Out when Inserting Battery
Response of Out when Removing Battery
(VBAT = 0V→ 3.6V; VADP = 5V; VENBAT = 5V; VENO = 0V; RLOAD = 50Ω)
(VBAT = 3.6V→ 0V; VADP = 5V; VENBAT = 5V; VENO = 0V; RLOAD = 50Ω)
7
6
5
4
3
2
7
6
5
4
3
2
1
1
VADP
VADP
VBAT
VBAT
0
-1
0
-1
VOUT
VOUT
Time (200μs/div)
Time (200μs/div)
Input High Threshold vs. Adapter Voltage
Input Low Threshold vs. Adapter Voltage
1.6
1.6
-25°C
25°C
85°C
-25°C
25°C
85°C
1.4
1.2
1
1.4
1.2
1
0.8
0.6
0.4
0.8
0.6
0.4
5
5.25
5.5
5.75
6
6.25
6.5
5
5.25
5.5
5.75
6
6.25
6.5
VADP (V)
VADP (V)
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DATA SHEET
AAT3672
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)
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Functional Block Diagram
ADP to OUT Switch
OUT
ADP
EN/EN1
ENO
ENBAT
BAT
TS
CT
Charge
System
Control
TERM
Voltage
Sense
ADPSET
CHRADP
STAT1
Ref.
Thermal and
Current Sense
GND
STAT2/EN2
The system load current drawn from the battery is lim-
ited internally. The AAT3672 precisely regulates battery
Functional Description
The AAT3672 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.
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 AAT3672 pre-conditions
(trickle charge) 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 three pass devices to control the
charge current or voltage from the adapter input power
to the battery and system load. It also contains an addi-
tional load switch to control 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.
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 AAT3672 has
a unique internal charge current reduction loop control
that will prevent an input source from overload. In the
When an input power source is applied to the AAT3672,
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.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
case of USB charging from a USB port VUSB supply, there
Charging Operation
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 AAT3672 exceeds the ability of a given USB port. In
either case, the AAT3672 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 charg-
ing of a battery cell with the maximum possible amount
of charge current for any given source fault condition.
The AAT3672 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 AAT3672 checks several
conditions in order to assure a safe charging environ-
ment. 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
AAT3672 checks the state of the battery by sensing the
cell voltage. If the cell voltage is below the precondition-
ing voltage threshold (VMIN), the AAT3672 begins precon-
ditioning the battery cell.
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 AAT3672
utilizes a digitally controlled thermal loop system that
will reduce the charging current to prevent the device
from thermal shutdown. The digital thermal loop will
maintain the maximum possible battery charging cur-
rent for the given set of input to output power dissipa-
tion and ambient temperature conditions.
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
AAT3672 begins the fast charge constant current phase.
The fast charge constant current (ICH_CC) level is pro-
grammed by the user via the RSET resistor. The AAT3672
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:
The digital thermal loop control is dynamic in the sense
that it will continue to adjust the battery charging cur-
rent as operating conditions change. The digital thermal
loop will reset and resume normal operation when the
power dissipation or over temperature conditions are
removed.
2V
RSET
ICH_CC = KI_CC_ADP
·
Alternately, to select the resistor value for a given charg-
ing current use:
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 auto-
matically shut down, thus protecting the charging device,
control system, and the battery under charge. In addition
to internal charge controller thermal protection, the
AAT3672 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).
2V
ICH_CC
RSET = KI_CC_ADP
·
where KI_CC_ADP = 29300 (typical).
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Control Inputs
ENO
Pass Devices
EN
ENBAT
ADP - OUT
ADP - BAT
BAT - OUT
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
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: AAT3672-1 and AAT3672-2 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
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
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: AAT3672-3 Battery and Adapter Dynamic Path Control Table.
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.
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.
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:
End of Charge Cycle Termination
and Recharge Sequence
2V
RTERM
ICH_TERM = KI_TERM
·
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-
or
2V
ICH_TERM
RTERM = KI_TERM
·
KI_TERM = 2000 (typical).
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
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.
resume charging once the input supply has recovered
from its fault condition.
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 input supply is disconnected, the charger also
automatically enters power-saving sleep mode. Only
consuming less than 1μA in sleep mode, the AAT3672
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 AAT3672 input voltage drops, the
device will enter the sleep mode and automatically
resume charging once the input supply has recovered
from its fault condition.
37
Table 3: Charge Termination Current
Programming Resistor Values.
Dynamic Current Regulation
When the input supply is disconnected, the charger also
automatically enters power-saving sleep mode.
Consuming less than 1μA in sleep mode, the AAT3672
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 AAT3672 input voltage drops, the
device will enter the sleep mode and automatically
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 cur-
rent is set by the RSET resistor (fast charge current set-
ting, 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
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
varies in order to maintain the adapter input current.
VADP
ICH_CC = IBAT + IBAT-OUT
ADP
AAT3672
For example: If RSET = 57.6kꢀ, 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.
0.60 x VADP
Battery Cold Fault
Battery Hot Fault
TS
Battery
Pack
x VADP
In the second case, the ADP-BAT switch, the BAT-OUT
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.
Figure 2: AAT3672 Battery Temperature
Sense Circuit.
Charge Safety Timer (CT)
While monitoring the charge cycle, the AAT3672 utilizes
a charge safety 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 AAT3672
charges the cell at 10% of the programmed maximum
charge until VBAT >2.9V. If the cell voltage fails to the
precondition 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 peri-
ods: about 50 minutes for Trickle Charge mode, 6 hours
for Constant Current (CC) mode and Constant Voltage
(CV) mode altogether.
ILIM_ADP ≥ ICH_CC + IADP-OUT
For example: If RSET = 57.6kꢀ, 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.
The timeout is 7 hours (typical) for a CT = 100nF capac-
itor. Timeout is directly proportional to capacitor value,
so for a 200nF capacitor it would be 14 hours, and for a
50nF capacitor it would be 3.5 hours.
Temperature Sense (TS)
Inside the AAT3672, the internal battery temperature
sensing system is comprised of two comparators which
establish a voltage window for safe operation. The thresh-
olds for the TS operating window are bounded by the TS1
and TS2 specifications. Referring to the electrical charac-
teristics table in this datasheet, the TS1 threshold = 0.30
· VADP and the TS2 threshold = 0.60 · VADP. If the use of
the TS pin function is not required by the system, it
should be terminated to ground using a 10kꢀ resistor.
For a given target delay time TD (in hours) calculate:
(TD · 100nF)
CT =
7
The CT pin is driven by a constant current source and
provides a linear response to increases in the timing
capacitor value.
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
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
control circuit. The constant current provided to charge
possible to the CT pin. Since the accuracy of the internal
timer is dominated by the capacitance value, a 10% tol-
erance or better ceramic capacitor is recommended.
Ceramic capacitor materials, such as X7R and X5R
types, are a good choice for this application.
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
System Operation Flowchart
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
No
Current
Yes
Constant Current
Charging Mode
Phase Test
Yes
VCO(REG) > VBAT
Reduce
Charging
Current to BAT
No
Voltage
Phase Test
IBAT > ITERM
Charge
Reduction
Mode
Yes
Constant Voltage
Charge Mode
No
IOUT + IBAT > ILIM
?
No
Yes
Yes
Input Voltage
Level Test
VADP < VCHR_TH
Voltage
Regulation
Enable
Charge
Complete
No
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
The following equation may be used to approximate the
ADP charge reduction threshold above or below 4.5V:
Applications Information
Adapter or USB Port Power Source
2.0V
(R4/[R4 + R3])
VCHR_TH
=
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 4.35V to 5.5V.
where R4 and R3 < 500k.
The constant fast charge current for the adapter input
mode is set by the RSET 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 3 for
recommended RSET values for a desired constant current
charge level. Battery charging states will be indicated via
the STAT1 and STAT2 display LEDs for the AAT3672-1
and -2, and via STAT1 for the AAT3672-3. Please refer to
the Battery Charge Status Indication discussion on page
19 of this datasheet for further details.
ADP
VADP
R3
1M
CHRADP
VCH_REG= 2.0
R4
800k
Charge Reduction
Under normal operation, the AAT3672 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 AAT3672 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.
Figure 3: Internal Equivalent Circuit
for the CHRADP Pin.
Adapter Input Charge
Inhibit and Resume
The AAT3672 has an under-voltage lockout (UVLO) and
power on reset feature to protect the charger IC in the
event the input supply to the adapter pin drops below the
UVLO threshold. Under a UVLO condition, the charger will
suspend the charging process. When power is re-applied
to the adapter pin 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 a point above 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 ADP 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 ADP
input pin.
Programming Fast Charge Current
The constant current charge level is user programmed
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 3.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Charge current setting formula:
Battery Connection (BAT)
A single cell Li-Ion/Polymer battery should be connected
between BAT input and ground.
VADP
ICH_CC_ADP (typ) =
RSET
· KII_CC_ADP
Battery Charge Status Indication
Constant Charge
Current (mA)
Set Resistor Value (kꢀ)
Charge Status Indicator Outputs
100
200
300
400
500
800
1000
1600
665
324
215
162
127
76.8
57.6
36.5
There are three device options. All options include
recharge sequence after adapter is inserted. The AAT3672-
1 and AAT3672-2 have two status (STAT1 and STAT2)
pins and one enable pin (EN); the AAT3672-3 has one
status pin (STAT1) and two enable pins (EN1 and EN2)
Charge State
STAT1
STAT2
Pre-Charge
Fast-Charge
End of Charge (Charge complete)
ON
ON
OFF
ON
OFF
ON
Table 3: RSET Values.
Charge Disabled, Sleep Mode or
Fault Condition
For the AAT3672-3, 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 cur-
rent mode, and a shutdown mode. The STAT1 function-
ality is identical for all three options.
OFF
OFF
Flash (1Hz, Flash (1Hz,
40% duty) 40% duty)
No Battery (with Charge Enabled)
Table 5: AAT3672-1 LED Status Indicators.
Charge State
STAT1
STAT2
EN1
EN2
Operating Mode
Pre-Charge or Fast-Charge
End of Charge (Charge Complete,
Charge Disabled, or Sleep Mode)
ON
OFF
0
0
1
1
0
1
0
1
USB Low, 100mA charging current
USB High, 500mA charging current
Using RADP to program charging current
Shutdown mode
OFF
OFF
Flash (1Hz,
40% duty)
OFF
ON
Fault Condition
No Battery (with Charge Enabled)
OFF
Table 4: AAT3672-3 Operating Modes.
Table 6: AAT3672-2 LED Status Indicators.
Figure 4 shows the relationship of constant charging cur-
rent and set resistor values for the AAT3672.
Charge State
STAT1
10000
Pre-Charge or Fast-Charge
End of Charge (Charge Complete, Charge
Disabled, Sleep Mode, or Fault Condition)
ON
Constant Current
Pre-Conditioning
1000
OFF
Flash (1Hz,
40% duty)
No Battery (with Charge Enabled)
100
10
1
Table 7: AAT3672-3 LED Status Indicators.
Fault condition can be one of the following:
•
•
•
•
Battery over-voltage (OV)
10
100
1000
10000
Battery temperature sense hot or cold
Battery charge timer time-out
Chip thermal shutdown
RADP (kΩ)
Figure 4: Constant Charging Current
vs. Set Resistor Values.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
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 AAT3672-1/-2 and the STAT1 pin of the
AAT3672-3. These pins have simple switches connecting
the LED’s cathodes to ground. Refer to Tables 5, 6, and 7
for LED display definitions. The LED anodes should be
connected to VADP, depending upon system design require-
ments. 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 AAT3672-1/-2 and
the STAT1 pin of the AAT3672-3. 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 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 AAT3672 will
always provide the highest possible level of constant cur-
rent in the fast charge mode for any given ambient tem-
perature 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 AAT3672 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 to the
trickle charge to the fast charge constant current mode
and then to the constant voltage mode, the timing coun-
ter is reset and will time out after 6 hours.
VADP - VFLED
ILED(STAT1,2)
RB(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:
Trickle Charge (TC) time out = 50 minutes
Fast Charge Constant Current (CC) + Constant Voltage
(VC) mode time out = 6 hours
VUSB - VFLED
ILED(STAT1,2)
RB(STAT1,2)
=
Example:
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 + VC time divided by 8.
5.0V - 3.2V
2mA
RB(STAT1,2)
=
= 900Ω
Green LED forward voltage (VF) is typically 3.2V @ 2mA.
Protection Circuitry
Thermal Loop Control
If the programmable watchdog timer function is not
needed it may be disabled the 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.
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.
The charge timer control will suspend the timing count in
any given mode in the event a fault condition occurs.
Such fault conditions include digital thermal loop charge
current reduction, battery charge reduction, battery tem-
The thermal management system measures the internal
circuit die temperature and reduces the charge current
when the device exceeds a preset internal temperature
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
perature fault, and battery current sharing with the out-
put during the charging cycle. When the fault condition
recovers, the counter will resume the timing function.
pin as practically possible. Ceramic, tantalum, or alumi-
num 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.
The charge timer will automatically reset when the
AAT3672 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.
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
Battery Over-Voltage Protection
The AAT3672 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.
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 AAT3672 charge control will shutdown the
device until voltage on the BAT pin drops below the over-
voltage protection threshold (VBOVP). The AAT3672 will
resume normal charging operation once the battery
over-voltage condition is removed.
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,
ceramic capacitors in the 1.0μF to 10μF range are recom-
mended or best performance. Applications utilizing the
exceptionally low output noise and optimum power sup-
ply ripple rejection of the AAT3672 should use 2.2μF or
greater values for the system power output capacitor.
Over-Temperature Shutdown
The AAT3672 has a thermal protection control circuit
which will shut down charging functions should the inter-
nal die temperature exceed the preset thermal limit
threshold.
Battery Temperature Fault Monitoring
In the event of a battery over-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
AAT3672 checks battery temperature before starting the
charge cycle, as well as during all stages of charging.
Typically, batteries employ the use of a negative tem-
perature coefficient (NTC) thermistor that is integrated
into the battery.
Printed Circuit Board
Layout Recommendations
For proper thermal management and to take advantage
of the low RDS(ON) of the AAT3672, 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
AAT3672 TDFN33 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.
Capacitor Selection
Input Capacitor
A 1μF or larger capacitor is typically recommended for
C
ADP. CADP should be located as close to the device ADP
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Figure 4: AAT3672-1/-2 Evaluation
Board Top Layer.
Figure 5: AAT3672-1/-2 Evaluation
Board Mid1 Layer.
Figure 6: AAT3672-1/-2 Evaluation
Board Mid2 Layer.
Figure 7: AAT3672-1/-2 Evaluation
Board Bottom Layer.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Figure 8: AAT3672-3 Evaluation
Board Top Layer.
Figure 9: AAT3672-3 Evaluation
Board Mid1 Layer.
Figure 10: AAT3672-3 Evaluation
Board Mid2 Layer.
Figure 11: AAT3672-3 Evaluation
Board Bottom Layer.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
C3
10μF
TDFN44-16
ADP
2
6
7
13
12
OUT
BAT
ADP
OUT
BAT
J1
3
2
1
EN
J2
EN
3
2
1
R7
C2
10μF
J3
10K
ENO
1
2
3
8
ENBAT
ENO
AAT3672-1/-2
STAT1
ENBAT
3
5
9
R3
Green LED
11
R5
1.5K
TS
open
D1
D2
TS
STAT2
Red LED
R6
1.5K
10
14
TERM
CHRADP
C1
10μF
R8
10K
R4
open
R2
71.5K
1
ADPSET GND CT
4
CT
C4
0.1μF
R1
57.6K
Figure 12: AAT3672-1/-2 Evaluation Board Schematic.
C3
10μF
TDFN33-14
2
6
5
13
12
ADP
OUT
BAT
ADP
OUT
J1
3
2
1
EN1
BAT
J2
AAT3672-3
EN2
R6
3
2
1
C2
10μF
EN1
J4
10K
1
2
3
8
ENBAT
J3
EN2
3
2
1
7
3
9
ENO
ENBAT
R3
11
R5
1.5K
TS
open
TS
ENO
STAT1
CHRADP
D1
Green LED
10
14
TERM
C1
10μF
R7
10K
R4
open
CT
R2
71.5K
1
ADPSET GND CT
4
C4
0.1μF
R1
57.6K
Figure 13: AAT3672-3 Evaluation Board Schematic.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Component
Part Number
Description
Manufacturer
U1
R1
R2
AAT3672-1/-2IWP
Chip Resistor
1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 Package
57.6kꢀ, 1%, 1/4W; 0603
71.5kꢀ, 5%, 1/4W; 0603
1.5kΩ, 5%, 1/4W; 0603
Skyworks
Chip Resistor
Chip Resistor
Chip Resistor
Vishay
R5, R6
R7, R8
C4
C1, C2, C3
J1, J2, J3
D1
10kΩ, 5%, 1/4W; 0603
GRM188R61A225KE34
GRM21BR71A106KE51L
PRPN401PAEN
0.1ꢁF 10V 10% X5R 0603
10ꢁF 10V 10% X7R 0805
Conn. Header, 2mm zip
Murata
Sullins Electronics
Lite-On Inc.
LTST-C190GKT
LTST-C190CKT
Green LED; 0603
Red LED; 0603
D2
Table 8: AAT3672-1/-2 Evaluation Board Bill of Materials (BOM).
Component
Part Number
Description
Manufacturer
U1
R1
R2
AAT3672-3IWP
Chip Resistor
Chip Resistor
1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 Package
57.6kΩ, 1%, 1/4W; 0603
Skyworks
71.5kΩ, 5%, 1/4W; 0603
1.5kΩ, 5%, 1/4W; 0603
Vishay
R5
Chip Resistor
R6, R7
C4
C1, C2, C3
J1, J2, J3, J4
D1
Chip Resistor
10kΩ, 5%, 1/4W; 0603
0.1ꢁF 10V 10% X5R 0603
10ꢁF 10V 10% X7R 0805
GRM188R61A225KE34
GRM21BR71A106KE51L
PRPN401PAEN
Murata
Conn. Header, 2mm zip
Sullins Electronics
Lite-On Inc.
LTST-C190GKT
Green LED; 0603
Table 9: AAT3672-3 Evaluation Board Bill of Materials (BOM).
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TDFN33-14
TDFN33-14
TDFN33-14
4RXYY
3SXYY
4QXYY
AAT3672IWO-4.2-1-T1
AAT3672IWO-4.2-2-T1
AAT3672IWO-4.2-3-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
TDFN33-143
Detail "A"
Index Area
1.650 0.050
3.000 0.050
Top View
Bottom View
0.425 0.050
+ 0.100
0.000
- 0.000
Pin 1 Indicator
(Optional)
Side View
Detail "A"
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
AAT3672
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
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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.
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