AAT3672 - Skyworks Solutions, Inc.

DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
General Description
Features
The AAT3672 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.
• 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
• 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
• 14-pin 3 × 3mm TDFN Package
The AAT3672 provides charging current and system
power management from a single input that may be supplied 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.
The AAT3672 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 AAT3672 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 AAT3672-1/-2 has two
status monitor output pins (STAT1 and STAT2), and the
AAT3672-3 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 AAT3672 is available in a Pb-free, thermally
enhanced, space-saving 14-pin 3 × 3mm TDFN package.
Typical Application
System Load
System Load
Adapter Input
BAT+
STAT2
ADP
CADP
10μF
CADP
10μF
CBAT
10μF
ADP
BAT +
ADP
BAT
Adapter Input
10kΩ
EN2
Temp
Temp
Enable Input to Output
Enable Input to Output
TS
ENO
Enable Battery to Output
CHR Threshold
Battery
Pack
TS
ENO
Enable Battery to Output
CHR Threshold
ENBAT
CHRADP
ADPSET
Battery
Pack
CHRADP
ADPSET
CT
CT
TERM
TERM
RTERM
CBAT
10μF
ADP
EN1
EN
RSET
AAT3672-3
Enable 2
10kΩ
ENBAT
BAT
Enable 1
AAT3672-1/-2
Enable
OUT
STAT1
OUT
STAT1
GND
CT
RSET
RTERM
GND
CT
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
1
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Pin Descriptions
Pin #
Name
Type
1
ADPSET
I
2
ADP
I
3
STAT1
O
4
GND
I/O
STAT2
O
EN2
I
EN
I
EN1
I
7
ENO
I
8
ENBAT
I
9
CHRADP
I
10
TERM
I
11
TS
I
12
BAT
I/O
13
OUT
O
14
CT
I
EP
EP
I/O
5
6
2
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 capacitor as close as possible between ADP 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
ADP.
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 charging path; low or floating to disable the ADP switch and battery charging function. See Table 1 in the
"Functional Description" section of this datasheet.
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 battery cell and OUT (internal pull down).
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.
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, connect with a 10kΩ resistor between this pin and GND.
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.
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 as closely to the device as possible.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Pin Configuration
TDFN33-14
(Top View)
AAT3672-1/2
ADPSET
ADP
STAT1
GND
STAT2
EN
ENO
1
14
2
13
3
4
12
EP
11
5
10
6
9
7
8
AAT3672-3
CT
OUT
BAT
TS
TERM
CHRADP
ENBAT
ADPSET
ADP
STAT1
GND
EN2
EN1
ENO
1
14
2
13
3
4
12
EP
11
5
10
6
9
7
8
CT
OUT
BAT
TS
TERM
CHRADP
ENBAT
Absolute Maximum Ratings
Symbol
VP
Description
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
VN
TJ
TLEAD
TA
Value
-0.3 to 7.5
-0.3 to 7.5
-0.3 to VP + 0.3
-40 to 150
300
-25 to 85
Units
V
°C
Thermal Information1, 2
Symbol
θJA
θJC
PD
Description
Maximum Thermal Resistance
Maximum Thermal Resistance
Maximum Power Dissipation
Value
50
37
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
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
3
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
Conditions
Operation
VADP
AC Adapter Operating Voltage Range
VBAT
Battery Operating Voltage Range
VUVLO_ADP
ADP Under-Voltage Lockout
VUVLO_BAT
BAT Under-Voltage Lockout
IADP_OP
IADP_SHDN1/2
IADP_SHDN3
ADP Normal Operating Current
ADP Shutdown Mode Current for AAT3672-1/-2
ADP Shutdown Mode Current for AAT3673-3
IBAT_OP
Battery Operating Current
IBAT_SLP
Battery Sleep Current
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
VCO(REG)
Output Charge Voltage Regulation
VMIN
Preconditioning Voltage Threshold
VRCH
VCHR_TH
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
VBAT = VCO(REG), VADP = GND,
VUSB = GND, VENBAT = 5V, No Load
VBAT = VCO(REG), VADP = 5V,
VEN = VENBAT = 5V
VBAT = VCO(REG), VENBAT = 0V
ADP Charge Constant Current Charge Range
ΔICH_CC/
ICH_CC
Constant Current Charge Current
Regulation Tolerance
2.8
3.4
0.1
2.9
0.1
0.5
Max
6.5
VCO(REG)
3.9
V
3.0
1
mA
5
60
120
4
10
μA
1
600
mΩ
80
600
4.158
2.8
VCO(REG)
- 0.17
CHRADP Open; Reduce Charge
Current When ADP is Below
VCHR_TH
4.20
2.9
VCO(REG)
- 0.1
4.242
3.0
VCO(REG)
- 0.05
V
4.5
1.9
2.0
2.1
1.6
2.3
ICH_CC_ADP = 1A
Units
1
VADP = 5.0V
VBAT = 4.1V
VADP = 5.0V
VCHR_REG
CHRADP and CHRUSB Pin Voltage Accuracy
Current Regulation
ILIM_ADP
ADP Current Limit (Fixed)
BAT_OUT Current Limit (Fixed)
ILIM_BAT
ICH_CC_ADP
Typ
4.0
3.0
Battery Recharge Voltage Threshold
Default ADP Charge Reduction Threshold
Min
A
100
1600
mA
-12
12
%
ADP Charge Trickle Charge
10
%
ICH_CC_ADP
ADPSET Pin Voltage Regulation
TERM Pin Voltage Regulation
Constant Current Charge Current Set
KI_CC_ADP
Factor: ICH_CC_ADP/IADPSET
Termination Current Set Factor:
KI_TERM
ICH_TERM/ITERM
AAT3672-3 Only
ICH_LO
USB Low Level Charge Current (Fixed)
USB High Level Charge Current (Fixed)
ICH_HI
2
2
V
ICH_TKL_ADP
VADPSET
VTERM
29300
2000
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 correlation with statistical process controls.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
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
Logic Control/Protection
Input High Threshold
VEN
VEN
Input Low Threshold
VSTATx
Output Low Voltage
Fast Charge (Trickle Charge + Constant Current +
TC
Constant Voltage Charges Together) Timeout
TTKL
Trickle Charge Timeout
VBOVP
Battery Charge Over-Current Protection Threshold
TS1
TS2
High Temperature Threshold
Low Temperature Threshold
Digital Thermal Loop Entry Threshold
Digital Thermal Loop Exit Threshold
Digital Thermal Loop Regulated Temperature
TSHDN
Chip Thermal Shutdown Temperature
Min
Typ
Max
Units
0.4
0.4
V
7
hour
1.6
STATx Pin Sinks 8mA
CCT = 0.1μF
VCO(REG)
+ 0.1
Battery Over-Voltage Protection Threshold
IOCP
TLOOP_IN
TLOOP_OUT
TLOOP_REG
Conditions
In All Modes
TC/8
VCO(REG)
+ 0.2
100
28
58
Threshold
Hysteresis
VCO(REG)
+ 0.15
30
60
115
95
100
140
15
32
62
V
%
ICH_CC
% VADP
% VADP
ºC
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 correlation with statistical process controls.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
5
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
0.8
0.7
0.6
0.5
0.4
0.3
0.2
Constant Current
Pre-Conditioning
0.1
0.0
10
100
1000
10000
Constant Charge Current vs. RADP
Constant Charge Current (mA)
Operating Current IADP_OP (mA)
Adapter Supply Operating Current vs. RSET
10000
Constant Current
Pre-Conditioning
1000
100
10
1
10
100
RSET (kΩ)
1000
10000
RADP (kΩ)
Output Charge Voltage Regulation
Accuracy vs. Adapter Voltage
Output Charge Voltage vs. Temperature
(VCO(REG) = 4.2V)
4.23
Battery Voltage (V)
0.25
Accuracy (%)
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
4.22
4.21
4.2
4.19
4.18
-0.2
4.17
-25
-0.25
5
5.25
5.5
5.75
6
6.25
6.5
-15
-5
5
Battery Sleep Current vs. Temperature
35
45
55
65
75
85
Operating Current vs. Temperature
5
0.7
0.65
4.5
0.6
4
IOP (mA)
Battery Sleep Current (μA)
25
Temperature (°°C)
VADP (V)
3.5
3
0.55
0.5
0.45
0.4
2.5
2
-25
0.35
-15
-5
5
15
25
35
45
Temperature (°°C)
6
15
55
65
75
85
0.3
-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
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
65
75
85
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Recharge Voltage Threshold vs. Temperature
(VADP = 5V; RSET = 56.7kΩ)
1.1
4.16
1.05
Battery Voltage (V)
Constant Charging Current (A)
Constant Charging Current
vs. Adapter Voltage
1
0.95
0.9
0.85
0.8
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.1V
0.75
0.7
4
4.5
5
5.5
6
4.14
4.12
4.1
4.08
4.06
4.04
-25
6.5
-15
-5
5
Constant Charge Current vs. Temperature
35
45
55
65
75
85
Constant Charge Current vs. Battery Voltage
1100
1200
1000
900
Chargin Current (mA)
Constant Charge Current (mA)
25
Temperature (°°C)
VADP (V)
1A
425mA
85mA
800
700
600
500
400
300
200
100
-15
-5
5
15
25
35
45
55
65
75
800
600
400
200
0
2.5
0
-25
1A
425mA
85mA
1000
85
2.9
3.3
Temperature (°°C)
3.7
4.1
4.5
Battery Voltage (V)
Preconditioning Voltage Threshold
vs. Adapter Voltage
Preconditioning Voltage Threshold
vs. Temperature
3
3
2.98
2.98
2.96
2.96
2.94
VMIN (V)
2.94
VMIN (V)
15
2.92
2.9
2.88
2.92
2.9
2.88
2.86
2.86
2.84
2.84
2.82
2.82
2.8
5
5.25
5.5
5.75
VADP (V)
6
6.25
6.5
2.8
-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
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
7
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
Adapter and Charging Current
vs. Output Current
Adapter and Charging Current vs. Output Current
(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V;
AAT3672-3 VEN1 = VEN2 = 0V)
(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V)
1.8
Adapter Current (A)
Adapter Current (A)
2
1.8
1.6
1.4
1.2
1
0.8
0.6
IADP
IBAT
0.4
0.2
IADP
IBAT
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
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
Output Current (A)
IADP
IBAT
Capacitance (μF)
Current (A)
1.6
1.8
Full Charge
Trickle Charge
0.9
1.4
1.2
1
0.8
0.6
0.4
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.2
0
0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0
Output Current (A)
1
2
3
4
(500mA Charging Setting)
1A
0
1A
0
5
4.5
ADP Voltage
(top) (V)
4.5
Time
6
7
4
500mA
0
500mA
0
Time
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
ADP Charge Current (middle)
ADP Peripheral Current (bottom)
(0.5A/div)
ADP Charge Current
(1A Charging Setting)
ADP Charge Current (middle)
ADP Peripheral Current (bottom)
(0.5A/div)
ADP Charge Current
4
5
Time (hours)
5
ADP Voltage
(top) (V)
1.4
1
2
8
1.2
CT Pin Capacitance vs. Counter Timeout
(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V;
AAT3672-3 VEN1 = 0V; VEN2 = 5V)
1.6
1
Output Current (A)
Adapter and Charging Current vs. Output Current
1.8
0.8
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Typical Characteristics
(VADP = 5V→ 0V; VBAT = 3.6V; VENBAT = 5V; VENO = 5V; RLOAD = 50Ω)
7
6
5
4
3
2
VADP
VBAT
VOUT
1
0
-1
VADP, VBAT, VOUT Voltage (V)
Response of Out when Switching from VADP to VBAT
(VADP = 0V→ 5V; VBAT = 3.6V; RLOAD = 50Ω)
VADP, VBAT, VOUT Voltage (V)
Response of Out when Switching from VBAT to VADP
7
VADP
VBAT
VOUT
6
5
4
3
2
1
0
-1
Time (200μs/div)
Time (200μs/div)
7
6
5
4
3
2
VADP
VBAT
VOUT
1
0
-1
VADP, VBAT, VOUT Voltage (V)
Response of Out when Switching from VADP to VBAT
(VADP = 5V→ 0V; VBAT = 3.6V; VENBAT = 0V; VENO = 5V; RLOAD = 50Ω)
VADP, VBAT, VOUT Voltage (V)
Response of Out when Switching from VBAT to VADP
(VADP = 0V→ 5V; VBAT = 3.6V; VENBAT = 0V; VENO = 5V; RLOAD = 50Ω)
7
5
4
3
2
1
0
-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
6
5
4
3
2
1
VADP
VBAT
VOUT
0
-1
Time (200μs/div)
VADP, VBAT, VOUT Voltage (V)
VADP, VBAT, VOUT Voltage (V)
VADP
VBAT
VOUT
6
7
VADP
VBAT
VOUT
6
5
4
3
2
1
0
-1
Time (200μs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
9
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
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
VADP, VBAT, VOUT Voltage (V)
VADP, VBAT, VOUT Voltage (V)
Typical Characteristics
6
5
4
3
2
1
VADP
VBAT
VOUT
0
-1
7
6
5
4
3
2
VADP
VBAT
VOUT
1
0
-1
Time (200μs/div)
Time (200μs/div)
Response of Out when Removing Battery
(VBAT = 3.6V→ 0V; VADP = 5V; VENBAT = 5V; VENO = 0V; RLOAD = 50Ω)
7
VADP, VBAT, VOUT Voltage (V)
VADP, VBAT, VOUT Voltage (V)
Response of Out when Inserting Battery
(VBAT = 0V→ 3.6V; VADP = 5V; VENBAT = 5V; VENO = 0V; RLOAD = 50Ω)
6
5
4
3
2
1
VADP
VBAT
VOUT
0
-1
7
6
5
4
3
2
1
VADP
VBAT
VOUT
0
-1
Time (200μs/div)
Time (200μs/div)
1.6
-25°C
25°C
85°C
1.4
1.2
1
0.8
0.6
0.4
5
5.25
5.5
5.75
VADP (V)
10
6
6.25
6.5
Input Low Threshold vs. Adapter Voltage
VENBAT(L); VEN1(L); VEN2(L); VENO(L) (V)
VENBAT(H); VEN1(H); VEN2(H); VENO(H) (V)
Input High Threshold vs. Adapter Voltage
1.6
-25°C
25°C
85°C
1.4
1.2
1
0.8
0.6
0.4
5
5.25
5.5
5.75
6
VADP (V)
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6.25
6.5
DATA SHEET
AAT3672
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
Temperature (°°C)
55
65
75
85
61
60.5
60
59.5
59
58.5
58
-25
-15
-5
5
15
25
35
45
55
65
75
85
Temperature (°°C)
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11
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Functional Block Diagram
ADP to OUT Switch
OUT
ADP to BAT
Sw itch
EN/EN1
ENO
ENBAT
BAT to OUT
Switch
ADP
BAT
CT
TERM
Charge
System
Control
TS
Voltage
Sense
ADPSET
CHRADP
STAT1
STAT2/EN2
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 battery and power a system load simultaneously.
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 additional 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.
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.
12
Thermal and
Current Sense
Ref.
GND
The system load current drawn from the battery is limited internally. The AAT3672 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 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 automatically switch to a constant voltage mode until the charge
current is reduced to the programmed charge termination current threshold.
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
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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
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 charging of a battery cell with the maximum possible amount
of charge current for any given source fault condition.
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 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 current for the given set of input to output power dissipation and ambient temperature conditions.
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, overcurrent, 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
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).
Charging Operation
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 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
AAT3672 checks the state of the battery by sensing the
cell voltage. If the cell voltage is below the preconditioning voltage threshold (VMIN), the AAT3672 begins preconditioning the battery cell.
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
AAT3672 begins the fast charge constant current phase.
The fast charge constant current (ICH_CC) level is programmed by the user via the RSET resistor. The AAT3672
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
SET
Alternately, to select the resistor value for a given charging current use:
RSET = KI_CC_ADP ·
2V
ICH_CC
where KI_CC_ADP = 29300 (typical).
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13
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Control Inputs
Pass Devices
EN
ENO
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
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
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
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: AAT3672-3 Battery and Adapter Dynamic Path Control Table.
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.
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 termina14
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 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.
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).
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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
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.
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.
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 supply 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.
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 supply 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.
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 (IBATOUT) and the battery charge current (IBAT). The charge
current is dynamically adjusted as the system load
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15
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
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.
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 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.
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 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 = 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 10kΩ resistor.
AAT3672
ADP
0.60 x VADP
Battery Cold Fault
TS
Battery
Pack
Battery Hot Fault
x V ADP
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 periods: about 50 minutes for Trickle Charge mode, 6 hours
for Constant Current (CC) mode and Constant Voltage
(CV) mode altogether.
The timeout is 7 hours (typical) for a CT = 100nF capacitor. 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.
For a given target delay time TD (in hours) calculate:
CT =
(TD · 100nF)
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 unterminated, as this will cause errors in the internal timing
16
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
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.
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
System Operation Flowchart
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
Yes
Reduce
Charging
Current to BAT
Yes
Preconditioning
Test
VMIN > VBAT
IOUT + IBAT > ILIM?
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
IBAT > ITERM
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
17
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Applications Information
The following equation may be used to approximate the
ADP charge reduction threshold above or below 4.5V:
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 4.35V to 5.5V.
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.
VCHR_TH =
2.0V
(R4/[R4 + R3])
where R4 and R3 < 500k.
VADP
ADP
R3
1M
CHRADP
VCH_REG = 2.0
R4
800k
Charge Reduction
Under normal operation, the AAT3672 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 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.
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.
18
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.
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 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 3.
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Battery Connection (BAT)
Charge current setting formula:
ICH_CC_ADP (typ) =
A single cell Li-Ion/Polymer battery should be connected
between BAT input and ground.
VADP
· KII_CC_ADP
RSET
Battery Charge Status Indication
Constant Charge
Current (mA)
Set Resistor Value (kΩ)
100
200
300
400
500
800
1000
1600
665
324
215
162
127
76.8
57.6
36.5
Charge Status Indicator Outputs
There are three device options. All options include
recharge sequence after adapter is inserted. The AAT36721 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
Pre-Charge
Fast-Charge
End of Charge (Charge complete)
Charge Disabled, Sleep Mode or
Fault Condition
Table 3: RSET Values.
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 current mode, and a shutdown mode. The STAT1 functionality is identical for all three options.
No Battery (with Charge Enabled)
EN2
Operating Mode
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
Pre-Charge or Fast-Charge
End of Charge (Charge Complete,
Charge Disabled, or Sleep Mode)
Fault Condition
No Battery (with Charge Enabled)
Table 4: AAT3672-3 Operating Modes.
ON
OFF
ON
OFF
OFF
Flash (1Hz,
40% duty)
Flash (1Hz,
40% duty)
STAT1
STAT2
ON
OFF
OFF
OFF
OFF
Flash (1Hz,
40% duty)
ON
OFF
Table 6: AAT3672-2 LED Status Indicators.
Figure 4 shows the relationship of constant charging current and set resistor values for the AAT3672.
Constant Charge Current (mA)
STAT2
ON
ON
OFF
Table 5: AAT3672-1 LED Status Indicators.
Charge State
EN1
STAT1
Charge State
STAT1
Pre-Charge or Fast-Charge
End of Charge (Charge Complete, Charge
Disabled, Sleep Mode, or Fault Condition)
10000
Constant Current
Pre-Conditioning
1000
No Battery (with Charge Enabled)
ON
OFF
Flash (1Hz,
40% duty)
100
Table 7: AAT3672-3 LED Status Indicators.
10
Fault condition can be one of the following:
1
10
100
1000
RADP (kΩ)
Figure 4: Constant Charging Current
vs. Set Resistor Values.
10000
•
•
•
•
Battery over-voltage (OV)
Battery temperature sense hot or cold
Battery charge timer time-out
Chip thermal shutdown
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19
DATA SHEET
AAT3672
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 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 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 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 required ballast resistor value can be estimated
using the following formulas:
When connecting to the adapter supply with a red LED:
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 AAT3672 will
always provide the highest possible level of constant current in the fast charge mode for any given ambient temperature condition.
Programmable Watchdog Timer
Red LED forward voltage (VF) is typically 2.0V @ 2mA.
The AAT3672 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 to the
trickle charge to the fast charge constant current mode
and then to the constant voltage mode, the timing counter is reset and will time out after 6 hours.
When connecting to the USB supply with a green LED:
Summary for a 0.1μF used for the timing capacitor:
RB(STAT1,2) =
VADP - VFLED
ILED(STAT1,2)
Example:
RB(STAT1,2) =
5.5V - 2.0V
= 1.75kΩ
2mA
RB(STAT1,2) =
VUSB - VFLED
ILED(STAT1,2)
Example:
RB(STAT1,2) =
5.0V - 3.2V
= 900Ω
2mA
Green LED forward voltage (VF) is typically 3.2V @ 2mA.
Protection Circuitry
Thermal Loop Control
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.
The thermal management system measures the internal
circuit die temperature and reduces the charge current
when the device exceeds a preset internal temperature
20
Trickle Charge (TC) time out = 50 minutes
Fast Charge Constant Current (CC) + Constant Voltage
(VC) mode time out = 6 hours
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 + VC time divided by 8.
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.
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-
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
perature fault, 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
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 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 AAT3672 charge control will shutdown the
device until voltage on the BAT pin drops below the overvoltage protection threshold (VBOVP). The AAT3672 will
resume normal charging operation once the battery
over-voltage condition is removed.
Over-Temperature Shutdown
The AAT3672 has a thermal protection control circuit
which will shut down charging functions should the internal 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 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 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.
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,
ceramic capacitors in the 1.0μF to 10μF range are recommended or best performance. Applications utilizing the
exceptionally low output noise and optimum power supply ripple rejection of the AAT3672 should use 2.2μF or
greater values for the system power output capacitor.
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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21
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
22
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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23
DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
2
ADP
C3
10μF
TDFN44-16
ADP
OUT
13
OUT
J1
3
2
1
J2
6
EN
3
2
1
7
Red LED
BAT
R7
10K
ENBAT
D1
R5
1.5K
D2
R6
1.5K
STAT1
TS
C1
10μF
R4
open
1
2
3
8
ENBAT
11
TS
5
STAT2
9
CHRADP
TERM
10
1
ADPSET GND CT
14
R8
10K
C4
0.1μF
4
R1
57.6K
C2
10μF
J3
AAT3672-1/-2
3
Green LED
12
ENO
ENO
R3
open
BAT
EN
CT
R2
71.5K
Figure 12: AAT3672-1/-2 Evaluation Board Schematic.
2
ADP
C3
10μF
TDFN33-14
ADP
OUT
13
EN1
12
OUT
J1
3
2
1
6
J2
3
2
1
J3
R3
open
3
2
1
EN1
BAT
5
EN2
ENO
7
R4
open
1
2
3
8
C2
10μF
ENBAT
TS
11
3
STAT1
9
CHRADP
TERM
10
1
ADPSET GND CT
14
R1
57.6K
J4
ENO
D1
Green LED
C1
10μF
R6
10K
EN2
ENBAT
R5
1.5K
BAT
AAT3672-3
4
TS
R7
10K
CT
R2
71.5K
C4
0.1μF
Figure 13: AAT3672-3 Evaluation Board Schematic.
24
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Component
Part Number
Description
Manufacturer
U1
R1
R2
R5, R6
R7, R8
C4
C1, C2, C3
J1, J2, J3
D1
D2
AAT3672-1/-2IWP
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
GRM188R61A225KE34
GRM21BR71A106KE51L
PRPN401PAEN
LTST-C190GKT
LTST-C190CKT
1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 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
Murata
Sullins Electronics
Lite-On Inc.
Table 8: AAT3672-1/-2 Evaluation Board Bill of Materials (BOM).
Component
Part Number
Description
Manufacturer
U1
R1
R2
R5
R6, R7
C4
C1, C2, C3
J1, J2, J3, J4
D1
AAT3672-3IWP
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
GRM188R61A225KE34
GRM21BR71A106KE51L
PRPN401PAEN
LTST-C190GKT
1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 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 9: AAT3672-3 Evaluation Board Bill of Materials (BOM).
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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25
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"
3.000 ± 0.050
2.500 ± 0.050
Index Area
3.000 ± 0.050
1.650 ± 0.050
Top View
Bottom View
+ 0.100
- 0.000
Pin 1 Indicator
(Optional)
0.180 ± 0.050
Side View
0.400 BSC
0.000
0.203 REF
0.750 ± 0.050
0.425 ± 0.050
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.
26
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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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. 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
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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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27