201897B.pdf

DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
General Description
Features
The AAT3696 BatteryManager™ is a single-cell lithiumion (Li-Ion)/Li-Polymer battery charger IC designed to
operate from USB ports or AC adapter up to an input
voltage of 6.5V or 6.05V (depending on the option1). For
increased safety, the AAT3696 also includes over-voltage
input protection (OVP) up to 28V.
•
•
•
•
•
The AAT3696 precisely regulates battery voltage after it
has reached 4.2V or 4.375V (depending on the option1)
Li-Ion/Polymer battery cells through an extremely low
RDS(ON) switch. The charging current can be set by an
external resistor up to 1.6A. In case an over-voltage
condition occurs from the input, a series switch quickly
opens and a fault flag is activated to prevent damage to
the battery and charging circuitry.
Other fault conditions are monitored in real time. In case
of an over-current, battery over-voltage, short circuit, or
over-temperature failure, the device will automatically
shut down, thus protecting the charging device, control
system, and the battery under charge. A status monitoring output pin (STAT) is provided to indicate charging
activity. This open-drain output pin can be used to drive
an external LED as a charging indicator. The AAT3696
has two charge termination mode selections when the
battery voltage has reached the constant voltage level
VCO(REG) and the charging current has decreased the termination current level.
The AAT3696 offers a 4.9V/30mA LDO linear regulator.
This regulator is enabled all the time regardless of the
status of the charger and protected by the OVP switch.
The AAT3696 is available in the Pb-free, thermally
enhanced, space-saving 3x3mm TDFN33-12 package and
is rated over the -40°C to +85°C temperature range.
•
•
•
•
•
•
•
•
•
•
•
•
USB or AC Adapter System Power Charger
3.0V ~ 6.5V or 6.05V Input Voltage Range
2.8V Typical Under-Voltage Lockout Threshold
Fast Over-Voltage Protection Turn Off
Two OVP Turn-On Delay Time Options:
▪ 40μs
▪ 80ms
Two OVP Trip Point Options:
▪ Protection Trip at 6.75V
▪ Protection Trip at 6.25V
High Level of Integration with Internal:
▪ Power Device
▪ Reverse Current Blocking
▪ Current Sensing
4.9V/30mA LDO Output Through Over-Voltage
Protection Device
Programmable Current from 100mA to 1.6A Max
Charge Status Indicator
Automatic Recharge Sequencing
Automatic Trickle Charge For Battery Pre-Conditioning
Emergency Thermal Shutdown Protection
Power on Reset and Soft Start
Active Low Enable with Internal 200kΩ Pull-Down
Resistor
Two Charge Termination Control Selections:
▪ Manual: Continuous Battery Charging Until Charge
Termination by Enable Pin
▪ Automatic: Battery Charging is Terminated with
Transition to Sleep State
12-pin 3x3mm TDFN Package
Applications
•
•
•
•
•
Bluetooth™ Headsets, Headphones, Accessories
Digital Still Cameras
Mobile Telephones
MP3 Players
Personal Data Assistants (PDAs)
1. Please refer to Table 9 on page 19 for complete list of options.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
1
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Application
IN
VADP
BATT+
1μF
OVPFLG
BAT
BATS
OVPFLG
IC
INCHR
10μF
BATT-
INCHR
2.2μF
Battery
Pack
AAT3696
STAT
LDOOUT
LDOOUT
2.2μF
EN
ON/OFF
10kΩ
MODE
GND
System
ISET
RSET
Pin Descriptions
Pin #
Name
Type
1
INCHR
I/O
2
3
4
5
IN
LDOOUT
OVPFLG
STAT
I
O
O
O
6
MODE
I
7
8
9
10
11
12
GND
EN
ISET
IC
BATS
BAT
I/O
I
I
I
I
O
EP
Function
Output of over-voltage protection (OVP) stage and input to battery charger. Decouple to GND
with 2.2μF capacitor.
Input from USB port or AC adapter.
4.9V/30mA LDO output through OVP device. Bypass to GND with 2.2μF capacitor.
Over-voltage fault flag, open drain, active low.
Charge status indicator pin, open drain, active low.
MODE selection pin (internal connect with a 200kΩ pull-up resistor to INCHR). Factory default
at 10% termination current if MODE is open or connect to INCHR. Continues to charge if
MODE is connect to GND.
Power ground.
Active low enable pin (internal connect with a 200kΩ pull-down resistor).
Connect RSET resistor here to set adaptor or USB charging current.
Internally connected through 100kΩ resistor to GND. Leave this pin open.
Battery voltage remote sense input.
Connect to Li-Ion battery.
Exposed paddle (bottom); The exposed thermal pad (EP) should be connected to board
ground plane and pin 7. The ground plane should include a large exposed copper pad under
the package for thermal dissipation (see package outline).
Pin Configuration
TDFN33-12
(Top View)
INCHR
IN
LDOOUT
OVPFLG
STAT
MODE
2
1
12
2
11
3
10
4
9
5
8
6
7
BAT
BATS
IC
ISET
EN
GND
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Absolute Maximum Ratings1
Symbol
VIN
VP
VN
TJ
TA
TLEAD
Description
IN continuous
INCHR, EN, STAT, OVPFLG, MODE
BAT, BATS, LDOOUT, ISET, IC
Junction Temperature Range
Operating Temperature Range
Maximum Soldering Temperature (at Leads)
Value
Units
-0.3 to 30
-0.3 to 7.5
-0.3 to VP + 0.3
-40 to 150
-40 to 85
300
V
V
V
°C
°C
°C
Value
Units
50
2
°C/W
W
Thermal Information2
Symbol
JA
PD
Description
Maximum Thermal Resistance (TDFN33-12)
Maximum Power Dissipation
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on an FR4 board.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
3
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Electrical Characteristics1
VIN = 5V, TA = -40 to +85°C, RSET = 3.16kΩ, VMODE = 0V, BAT = BATS, unless otherwise noted. Typical values are at TA
= 25°C
Symbol
Description
Conditions
Min
Typ
Max
Units
V
0.5
28
6.5
6.05
0.6
mA
160
220
μA
0
1
μA
6.75
6.25
100
7.0
6.45
V
Operation
Input Over-Voltage Protection Range
VIN_MAX
VIN
Normal Operating Input Voltage Range
2, 3
Operating Current
Charge Function Shutdown Supply
ISD
Current (OVP function still active)
Leakage Current from BAT Pin
IBAT
Over-Voltage Protection
IOP
VOVPT
Over-Voltage Protection Trip Point2, 3
Hysteresis
Dropout Voltage between IN and INCHR
VDO_OVP
Pins
Battery Charger
Under-Voltage Lockout Threshold
VUVLO
UVLO Hysteresis
Dropout Voltage between INCHR and BAT
VDO_CHARGE
Pins
VBOVP
Battery Over-Voltage Protection Threshold
Voltage Regulation
VCO (REG)
Constant Output Voltage2, 3
Refer to Table 4
Refer to Table 4
RSET = 15.8 kΩ, VEN = 0V, VIN = 5V
3.0
3.0
VIN =VEN = 5.5V
VBAT = 4V, IN Pin Open
VIN Rising Edge; Refer to Table 4
VIN Rising Edge; Refer to Table 4
6.5
6.05
VIN = 5V, [email protected] = 1000mA, RSET = 1kΩ
VIN Rising edge
VIN = 4.2V, [email protected] = 1000mA, RSET = 1kΩ
Refer to Table 4
Refer to Table 4
TA = 25°C
TA = -40°C to +85°C
VCO/VCO
Constant Output Voltage Tolerance
VRCH
Battery Recharge Voltage Threshold
MODE = High
VMIN
Preconditioning Voltage Threshold2, 3
Refer to Table 4
Refer to Table 4
Current Regulation
Charge Current Programmable Range
ICC_RANGE
ICH_CC
Constant-Current Mode Charge Current
VISET
ISET Pin Voltage
KIISET
Charge Current Set Factor: ICH_CC/IISET
RSET = 15.8kΩ, VBAT = 3.6V
RSET = 3.16kΩ, VBAT = 3.6V
RSET = 1.58kΩ, VBAT = 3.6V
RSET = 1kΩ, VBAT = 3.6V
TA = 25°C
TA = -40°C to +85°C
VBAT = 3.6V
ICH_TRK
Trickle Charge Current
VBAT = 2.3V
ICH_TERM
Charge Termination Threshold Current
mV
200
2.5
2.8
150
100
-15%
-10%
-10%
-15%
1.98
1.9
mV
3.0
V
mV
200
mV
4.4
V
4.20
4.375
V
-0.5
-1
2.4
2
V
+0.5
+1
VCO(REG)
- 0.1
2.6
2.2
110
500
1000
1500
2
2
790
%
%
V
2.8
2.4
1600
+15%
+10%
+10%
+15%
2.02
2.1
12
10
V
mA
mA
mA
mA
mA
V
%
ICH_CC
%
ICH_CC
1. The AAT3696 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization and correlation with statistical process controls.
2. Only options -1, -2, -5, and -6 are available.
3. Please refer to Table 9 on page 19 for complete list of options.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Electrical Characteristics1
VIN = 5V, TA = -40 to +85°C, RISET = 3.16kΩ, VMODE = 0V, BAT = BATS, unless otherwise noted. Typical values are at TA
= 25°C
Symbol
Description
Logic Control / Battery Protection
VEN(H), VMODE(H)
Input High Threshold
VEN(L), VMODE(L)
Input Low Threshold
VSTAT
Output Low Voltage
ISTAT
STAT Pin Current Sink Capability
VOVPFLG
Output Low Voltage
IOVPFLG
OVPFLG Pin Current Sink Capability
OVPFLG Assertion Delay Time from OverTDLY_OVPFLG
Voltage
TRESPOV
Over-Voltage Protection Response Time
TOVPR
OVP Switch Turn-On Rise Time
TSHDN
Chip Thermal Shutdown Temperature
Conditions
VIN = 5V
Min
Typ
Max
Units
0.4
0.4
8
0.4
8
V
V
V
mA
V
mA
1.2
STAT pin sinks 4mA
OVPFLG pin sinks 4mA
From assertion of over-voltage
condition (OV)
VIN voltage step up from 6V to 8V,
RLOAD = 100Ω, CINCHR = 1μF
RLOAD = 100Ω, CINCHR = 1μF
Threshold
Hysteresis
1
μs
0.5
μs
100
140
15
μs
ºC
Options -1, -3, -5, -7, -9, -11, -13, -15
TRELDLY_OVPFLG_40μs
TOVPON_40μs
OVPFLG Release Delay Time
OVP Switch OVP Release Delay Time
TOVPSTARTON_40μs
OVP Switch Start Up Delay Time
From release of over-voltage
condition (OV)
VIN voltage step down from 8V to
6V, RLOAD = 100Ω, CINCHR = 1μF
VIN voltage step up from 0V to 5V,
RLOAD = 100Ω, CINCHR = 1μF
1.5
μs
40
μs
150
250
μs
Options -2, -4, -6, -8 , -10, -12, -14, -16
TRELDLY_OVPFLG_80ms
TOVPON_80ms
OVPFLG Release Delay Time
OVP Switch OVP Release Delay Time
TOVPSTARTON_80ms
OVP Switch Start Up Delay Time
From release of over-voltage
condition (OV)
VIN voltage step down from 8V to
6V, RLOAD = 100Ω, CINCHR = 1μF
VIN voltage step up from 0V to 5V,
RLOAD = 100Ω, CINCHR = 1μF
80
ms
80
ms
80
ms
Low Dropout Regulator (LDO)
VOUT
LDO Output Voltage Tolerance
VDO
ILIM
LDO Dropout Voltage
LDO Current Limit
VOUT/VOUT*VIN
LDO Line Regulation
VOUT(Line)
LDO Dynamic Line Regulation
VOUT(Load)
LDO Dynamic Load Regulation
TA = 25°C
TA = -40°C
to 85°C
VIN = 5V, ILDOOUT = 50mA
ILDOOUT = 30mA, VIN =4.9V
VOUT = 0V
VIN = 5V to 6V or 5.4V to 6.4V,
ILDOOUT = 10mA
ILDOOUT = 30mA, VIN = 5V to 6V or
5.4V to 6.4V, TR/TF = 2μs
ILDOOUT = 1mA to 30mA, TR <5μs;
VIN = VOUT(NOM) +1V
ILDOOUT = 1mA to
30mA, VIN = 5.1V
4.802
4.9
4.998
4.729
4.9
5.071
V
200
75
300
mV
mA
0.09
%/V
4.4
25
mV
60
mV
1. The AAT3696 is guaranteed to meet performance specifications over the -40°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 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
5
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Constant Charging Current vs.
Set Resistor Values
Operating Current vs. Set Resistor Values
2400
10000
Operating Current (μA)
Constant Charging Current (mA)
Typical Characteristics−Battery Charger
1000
100
10
1
0.1
1
10
Constant Current Mode
Preconditioning Mode
2100
1800
1500
1200
900
600
300
0
0.1
100
1
10
RSET (KΩ
Ω)
100
RSET (KΩ
Ω)
Constant Charging Current vs. Battery Voltage
Constant Charging Current vs. Temperature
RSET = 1.58KΩ
RSET = 1.96KΩ
1000
RSET = 2.67KΩ
RSET = 3.92KΩ
Constant Charging Current (mA)
Constant Charging Current (mA)
(RSET = 1.58KΩ)
1200
RSET = 7.87KΩ
800
600
400
200
0
2.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
1010
1006
1002
998
994
990
-40
-15
Constant Charging Current vs. Input Voltage
950
900
850
VBAT = 3.3V
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.1V
4.5
5.0
5.5
Input Voltage (V)
6
6.0
6.5
Constant Charging Current (mA)
Constant Charging Current (mA)
1000
700
4.0
60
85
(RSET = 3.16KΩ)
1050
750
35
Constant Charging Current vs. Input Voltage
(RSET =1.58KΩ)
800
10
Temperature (°C)
Battery Voltage (V)
580
560
540
520
500
480
460
VBAT = 3.3V
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.1V
440
420
400
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
6.5
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Characteristics−Battery Charger
Preconditioning Voltage Threshold
vs. Temperature
Preconditioning Charge Current
vs. Temperature
(RSET = 1.58KΩ; ICH_CC = 1000mA)
Preconditioning Charge
Current (mA)
Preconditioning Voltage
Threshold (V)
(RSET = 1.58KΩ)
2.63
2.62
2.61
2.60
2.59
2.58
2.57
2.56
2.55
-40
-15
10
35
60
120
115
110
105
100
95
90
85
80
-40
85
-15
Temperature (°C)
Constant Output Voltage vs. Temperature
Constant Output Voltage V)
Constant Output Voltage (V)
4.215
4.210
4.205
4.200
4.195
4.190
4.185
10
35
60
85
4.208
4.206
4.204
4.202
4.200
4.198
4.196
4.194
4.192
4.190
5.0
5.3
5.6
5.9
6.2
6.5
Input Voltage (V)
Enable Input Low Voltage vs. Input Voltage
Enable Input High Voltage vs. Input Voltage
0.900
0.81
0.78
0.75
0.72
0.69
0.66
85°C
25°C
-40°C
0.63
4.5
5.0
5.5
Input Voltage (V)
6.0
6.5
Enable High Voltage (V)
0.84
Enable Low Voltage (V)
85
4.210
Temperature (°C)
0.60
4.0
60
(RSET =1.58KΩ)
4.220
-15
35
Constant Output Voltage vs. Input Voltage
(RSET = 1.58KΩ)
4.180
-40
10
Temperature (°C)
0.899
0.898
0.897
0.896
0.895
0.894
0.893
85°C
25°C
-40°C
0.892
0.891
0.890
4.0
4.5
5.0
5.5
6.0
6.5
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
7
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Characteristics−OVP
OVPFLG Assertion Delay Time
OVPFLG Assertion Delay Time
(RLOAD = 100Ω, OVP Trip Point 6.75V)
(RLOAD = 100Ω, OVP Trip Point 6.25V)
8
8
7
4
3
2
Input Voltage
(top) (V)
5
6
5
4
3
2
1
1
0
0
Time (1μs/div)
OVPFLG Release Delay Time
OVPFLG Release Delay Time
(RLOAD = 100Ω, OVP Trip Point 6.75V)
(RLOAD = 100Ω, OVP Trip Point 6.25V)
8
7
7
5
4
3
2
OVPFLG Voltage
(bottom) (V)
6
Input Voltage
(top) (V)
8
OVPFLG Voltage
(bottom) (V)
Input Voltage
(top) (V)
Time (1μs/div)
6
5
4
3
2
1
1
0
0
Time (50μs/div)
Time (50μs/div)
OVP Switch Release Delay Time
OVP Switch Release Delay Time
(RLOAD = 100Ω, All 40μs Delay Options)
(RLOAD = 100Ω, All 80ms Delay Options)
12
8
8
10
6
6
4
6
4
2
Input Voltage
(top) (V)
10
8
4
6
2
4
0
2
0
0
-2
Time (10μs/div)
8
Time (50ms/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
INCHR Voltage
(bottom) (V)
10
INCHR Voltage
(bottom) (V)
Input Voltage
(top) (V)
OVPFLG Voltage
(bottom) (V)
OVPFLG Voltage
(bottom) (V)
Input Voltage
(top) (V)
7
6
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Characteristics−OVP
Over-Voltage Protection Response Time
(RLOAD = 100Ω, All 80ms Delay Options)
(RLOAD = 100Ω, All 40μs Delay Options)
10
8
8
4
2
8
0
6
4
6
4
2
8
0
6
4
2
2
0
0
Time (50ms/div)
Time (10μs/div)
OVP Trip Point vs. Temperature
Battery Recharge Voltage Threshold
vs. Temperature
(RSET = 1.58KΩ)
3696-1, -2
3696-5, -6
6.80
6.60
6.40
6.20
-15
10
35
Temperature (°C)
60
85
4.110
Battery Recharge
Voltage Threshold (V)
OVP Trip Point (V)
7.00
6.00
-40
INCHR Voltage
(bottom) (V)
6
Input Voltage
(top) (V)
10
INCHR Voltage
(bottom) (V)
Input Voltage
(top) (V)
Over-Voltage Protection Response Time
4.105
4.100
4.095
4.090
4.085
4.080
4.075
4.070
-40
-15
10
35
60
85
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
9
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Characteristics−LDO
(ILDOOUT = 30mA)
Output Voltage Accuracy (%)
LDO Output Voltage Accuracy vs. Input Voltage
(ILDOOUT = 10mA)
Output Voltage Accuracy (%)
LDO Output Voltage Accuracy vs. Input Voltage
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
85°C
25°C
-40°C
-0.15
-0.20
5.1
5.3
5.5
5.7
5.9
6.1
6.3
6.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
85°C
25°C
-40°C
-0.3
-0.4
5.1
5.3
5.5
Input Voltage (V)
LDO Output Voltage Accuracy vs. Temperature
Output Voltage Accuracy (%)
Output Voltage Accuracy (%)
0.800
0.600
0.400
0.200
0.000
-0.200
-0.400
-0.600
-0.800
10
35
60
85
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-40
-15
10
Output Voltage Accuracy (%)
Output Voltage (V)
4.890
4.880
4.870
4.860
4.850
4.840
4.830
4.820
4.810
4.800
Temperature (°C)
10
60
85
(VIN = 5.1V; VLDOOUT = 4.9V)
4.900
35
35
LDO Output Voltage Accuracy vs. Output Current
(ILDOOUT = 10mA)
10
6.5
Temperature (°C)
LDO Output Voltage vs. Temperature
-15
6.3
1.0
Temperature (°C)
-40
6.1
(ILDOOUT = 30mA)
1.000
-15
5.9
LDO Output Voltage Accuracy vs. Temperature
(ILDOOUT = 10mA)
-1.000
-40
5.7
Input Voltage (V)
60
85
0.1
85°C
25°C
-40°C
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
0
5
10
15
20
25
Output Current (mA)
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30
35
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Characteristics−LDO
LDO Load Transient
LDO Load Transient
(VIN = 5.4V; ILDOOUT = 1mA to 30mA; COUT = 1μF)
(VIN = 5.4V; ILDOOUT = 10mA to 30mA; CLDOOUT = 1μF)
60
20
0
100
50
0
Output Current
(top) (mA)
40
20
0
100
50
0
-50
-50
-100
-100
Time (100μs/div)
Output Voltage
(bottom) (mV)
40
Output Voltage
(bottom) (mV)
Output Current
(top) (mA)
60
Time (100μs/div)
LDO Line Transient
LDO Dropout Voltage vs. Output Current
8
6
5
5.1
4
5
4.9
4.8
4.7
4.6
Output Voltage
(bottom) (V)
Input Voltage
(top) (V)
7
LDO Dropout Voltage (mV)
(VIN = 5.4V to 6.4V; ILDOOUT = 30mA; CLDOOUT = 1μF)
300
250
200
150
100
85°C
25°C
-40°C
50
0
0
Time (100μs/div)
5
10
15
20
25
30
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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11
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Functional Block Diagram
INCHR
OVP
Switch
Reverse Blocking
BAT
IN
OVPFLG
LDOOUT
OVP
Sense and
Control
Current
Compare
CV/
Pre-charge
Constant
Current
UVLO
4.9V/30mA
LDO
Charge
Control
B ATS
Over-Temp
Protect
MODE
ISET
IC
STAT
EN
Charge
Status
GND
Functional Description
Preconditioning Charge
The AAT3696 is a high performance battery charger IC
designed to charge single-cell Lithium-Ion or Polymer
batteries with up to 1.6A of current from external power
source. It is a stand alone charging solution requiring
minimum input components. Also included a fast turn-off
over-voltage protection (OVP) circuits with +28V and
this OVP consist of a low resistance P-channel MOSFET
in series with the charge control MOSFET. The AAT3696
also designed with of under-voltage lockout protection,
over-voltage monitor, fast shut-down circuitry with a
fault output flag, and a 4.9V LDO with 30mA output
through the OVP switch.
Battery charging commences only after the AAT3696
checks several conditions in order to maintain a safe
charging environment. The input supply must be above
the minimum operating voltage, or under-voltage lockout threshold (VUVLO) and the enable pin must be low for
the charging sequence to begin. When these conditions
have been met and a battery is connected to the BAT
pin, the AAT3696 checks the state of the battery and
determines which charging mode to apply. If the battery
voltage is below the preconditioning voltage threshold
(VMIN), then the AAT3696 begins preconditioning the cell
(trickle charging) by charging at 10% of the programmed
constant current. For example, if the programmed fast
charge current is 1600mA, then the preconditioning
(trickle charge) current is 160mA. Battery cell preconditioning is a safety precaution for deeply discharged cells
and will also reduce the power dissipation in the internal
series pass transistor when the voltage across the device
is at greatest potential.
Battery Charging Operation
Figure 1 illustrates the entire battery charging profile or
operation, which consist of three phases:
1.
2.
3.
4.
12
Preconditioning (Trickle) Charge
Constant Current Charge
Constant Voltage Charge
Automatic Recharge when MODE = High
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DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Constant Current Charge
Battery cell preconditioning charge continues until the
battery voltage reaches the preconditioning voltage
threshold (VMIN). At this point, the AAT3696 begins constant current charge. The current level for this mode is
programmed using a single resistor from the ISET pin to
ground. The programmed current can be set at a minimum 100mA up to a maximum of 1.6A.
The AAT3696 has two charge termination control selections which can be set by the MODE pin.
MODE = 0 (Ground or logic low)
The charger regulates battery voltage at 4.2V or 4.375V
optional voltage and continues to charge the battery
with a current lower than the programmed charge termination current until the AAT3696 is disabled by applying logic high to the EN pin to stop charging.
Constant Voltage Charge
MODE = 1 (INCHR or logic high)
Constant current charge will continue until the battery
voltage reaches the constant output voltage threshold,
VCO (REG). The AAT3696 will then transition to constant
voltage mode, where the charge IC regulates the battery
voltage at constant output voltage (factory programmed
to 4.2V or 4.375V). The charging current at this phase
will decrease until the charge termination current or
10% of the programmed constant current is reached.
The charger turns off the series pass device and automatically goes into a power-saving sleep state. During
this time, a series pass device blocks the current in both
directions, preventing the battery from discharging
through the IC. The AAT3696 will remain in sleep mode
until the battery voltage drops below the VRCH threshold
or the charger is enabled or input power is recycled. The
AAT3696 will resume charging operation if no fault is
detected.
VCO(REG)
VRCH
ICH_CC
VMIN
Charger Turns OFF
When MODE = High
Battery Voltage
Charger Stays ON
When MODE = Low
Charger Turns ON
ICH_TRK
ICH_TERM
Battery Current
Preconditioning Charge
Constant Current Charge
Constant Voltage Charge
Battery Recharge
EN
Figure 1: Current vs. Voltage Profile during Charging Phases.
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13
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Charger Operational Flowchart
ADP
Voltage
Power
Input
S
Voltage
ADP
> VADPP
VIN>VUVLO
?
Power
Sleep
On
Sleep
Reset
Mode
Mode
No
Yes
Yes
Fault Conditions
Monitoring?
BOV, OT
No
Power
Select
EN = High
?
No
Yes
OVP Condition
Monitoring
VIN > VOVP
Charge Suspended
Yes
Shut
Disconnect
Input
ShutDown
Down
fromMode
charger
Mode
No
Preconditioning
Test
VV
VBAT
MIN >>V
MIN
Yes
Preconditioning
Shut
ShutDown
Down
(Trickle
Charge)
Mode
Mode
BAT
No
No
Recharge Test
V BAT < VRCH
Yes
Current Phase Test
VCO(REG) > V BAT
Yes
Constant
Shut
Down
ShutCurrent
Down
Charge
Mode
Mode
Mode
VCH >VBAT
No
Voltage Phase Test
IBAT > ITERM
Yes
Constant
Shut
Down
ShutVoltage
Down
Charge
Mode
Mode
Mode
IBAT> MIN
I
No
Mode = 0 ?
IBAT> MIN
I
Yes
Continuously
Shut
ShutDown
Down
Charging
at
Mode
Mode
Constant
Voltage
No
Charge
Charge
Completed
Completed
14
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DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Charge Status Output
The AAT3696 provides battery charging status via a status pin, STAT. This pin is internally connected to an
N-channel open-drain MOSFET, which can be used as a
logic signal, or drive an external LED. The charge status
indication pin (STAT) pulls high indicating charge completion or charge termination, regardless of the selection
of the charge termination mode, as long as the charge
termination current is reached.
The status pin indicates the following conditions described
in Table 1:
Charge Status
Status
Battery is charging
Charging is completed
When EN is high
Low
High
High
Table 1: LED Status Indicator.
Enable/Disable
The AAT3696 provides an enable function to control the
charger IC on and off. The enable (EN) pin is internally
pulled down with 200kΩ. When EN is pulled down or left
floating, normal device operation commences. When it is
pulled to a logic high level, the AAT3696 charging circuit
will be shut down and forced into sleep state but the
over-voltage protection circuit remains in active state.
Charging will be halted regardless of the battery voltage
or charging state. When the device is re-enabled, the
charge control circuit will automatically reset and
resume charging functions with the appropriate charging
mode based on the battery charge state and measured
cell voltage at the BAT pin.
Low Dropout Regulator
The AAT3696 includes a low dropout regulator with input
range from 5V to the OVP trip point which is 6.75V or
6.25V and is always enabled. The LDO output VOUT is set
to 4.9V and supplies a continuous current up to 30mA.
The LDO output needs to be decoupled with 2.2μF to
ground for stability reasons.
Over-Voltage Protection
In normal operation, an OVP switch acts as a load
switch, connecting the power source from IN to INCHR.
This switch is designed with very low resistance to minimize the voltage drop between the power source and
the charger and to reduce the power dissipation. When
the voltage on the power source exceeds the OVP trip
point, 6.75V or 6.25V respectively, the switch immediately becomes open (OFF) and disconnect the load and
the charger from the power source therefore, preventing
damage to any downstream components. Simultaneously,
the fault flag is raised, alerting the system. If an overvoltage condition is applied at the time of the device
enable, the switch remains open (OFF).
Under-Voltage Lockout (UVLO)
The AAT3696 has a 3V (maximum) under-voltage lockout level (UVLO). When the input voltage is less than the
UVLO level, the OVP switch and the charger are turned
off. It is designed with 150mV hysteresis to ensure circuit stability.
Over-Voltage Fault Flag Output
The over-voltage fault flag (OVPFLG) is an active-low
open-drain fault reporting output. A pull-up resistor
should be connected from to I/O voltage of the system.
In the event of an over-voltage condition OVPFLG will be
asserted immediately with approximately 1μs inherited
internal circuit delay. After the over-voltage fault is
released, OVPFLG will be de-asserted with 1.5μs delay
(optional of 80ms delay).
Battery Over-Voltage Protection
An over-voltage event is defined as a condition where
the voltage at the BAT pin exceeds the maximum battery
charge voltage and is set by the battery over-voltage
protection threshold (VBOVP). If an overvoltage condition
occurs sensed by the BATS pin, the AAT3696 charge
control will shut down the device until voltage at the BAT
pin drops below VBOVP. The AAT3696 will resume normal
charging operation after the over-voltage condition is
removed.
Over-Temperature Shutdown
The AAT3696 has a thermal protection control circuit
which will shut down charging functions if the internal
die temperature exceed the preset thermal limit threshold of 140°C. Once the internal die temperature falls
below the thermal limit, normal operation will resume
the previous charging state.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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15
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Application Information
Battery Connection and
Battery Voltage Sensing
Constant Charge Current
Battery Connection (BAT)
The constant current charge level is user programmed
with a set resistor connected between the ISET 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 2.
Charge current setting formula:
ICH_CC (typ) =
VISET
· KIISET
RSET
Constant Charge
Current (mA)
Set Resistor Value (kΩ)
110
200
400
500
600
800
1000
1500
15.8
7.87
3.92
3.16
2.67
1.96
1.58
1.00
Figure 2 shows the relationship of constant charging current and set resistor values for the AAT3696.
Charging Current vs. Set Resistor Values
Charging Current (mA)
10000
1000
100
10
1
10
100
RSET (kΩ
Ω)
Figure 2: Constant Charging Current
vs. Set Resistor Values.
Note: The ISET pin is very sensitive and if a total capacitive load of more than 20pF is connected, it may start
oscillating.
16
Battery Voltage Sensing (BATS)
The BATS pin is provided to employ an accurate voltage
sensing capability to measure the positive terminal voltage at the battery cell being charged. This function
reduces measured battery cell voltage error between the
battery terminal and the charge control IC. The AAT3696
charge control circuit will base charging mode states
upon the voltage sensed at the BATS pin. The BATS pin
must be connected to the battery terminal for correct
operation. If the battery voltage sense function is not
needed, the BATS pin should be terminated directly to
the BAT pin. If there is concern of the battery sense
function inadvertently becoming an open circuit, the
BATS pin may be terminated to the BAT pin using a 10kΩ
resistor. Under normal operation, the connection to the
battery terminal will be close to 0Ω; if the BATS connection becomes an open circuit, the 10kΩ resistor will provide feedback to the BATS pin from the BAT connection
with a voltage sensing accuracy loss of 1mV or less.
Status Indicator Display
Table 2: RSET Values.
1
0.1
A single cell Li-Ion/Polymer battery should be connected
between BAT input and ground.
Simple system charging status states can be displayed
using one LED in conjunction with the STAT pin on the
AAT3696. This pin has a simple switch connecting the
LED’s cathode to ground. Refer to Table 1 for LED display
definitions. The LED anodes should be connected to VIN,
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
STAT pin. LED current consumption will add to the overall thermal power budget for the device package, so it is
wise to keep the LED drive current to a minimum. 2mA
should be sufficient to drive most low cost green or red
LED. It is not recommended to exceed 8mA when driving
an individual status LED.
The required ballast resistor value can be estimated
using the following formulas:
When connecting to the adapter supply with a red LED:
RB(STAT) =
VADP - VFLED
ILED(STAT)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Charger Input Capacitor
Example:
RB(STAT) =
5.5V - 2.0V
= 1.75kΩ
2mA
Red LED forward voltage (VF) is typically 2.0V @ 2mA.
When connecting to the USB supply with a green LED:
RB(STAT) =
VUSB - VFLED
ILED(STAT)
Example:
RB(STAT) =
5.0V - 3.2V
= 900Ω
2mA
Green LED forward voltage (VF) is typically 3.2V @ 2mA.
IC Input
The AAT3696 has an IC input pin which is internally connected to ground through a 100kΩ resistor.
Capacitor Selection
Input Capacitor
A 1μF or larger capacitor is typically recommended for
CIN. CIN should be located as close to the device IN pin
as practically possible. Ceramic, tantalum, or aluminum
electrolytic capacitors may be selected for CIN. There is
no specific capacitor equivalent series resistance (ESR)
requirement for CIN. However, for higher current operation, ceramic capacitors are recommended for CIN 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.
A 2.2μF decoupling capacitor is recommended to be
placed between INCHR and GND.
Charger Output Capacitor
The AAT3696 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. If
the AAT3696 is used in applications where the battery
can be removed from the charger, such as desktop
charging cradles, an output capacitor greater than 10μF
may be required to prevent the device from cycling on
and off when no battery is present.
Linear Regulator Output Capacitor
For proper load voltage regulation and operational stability, a capacitor is required between LDOOUT and GND.
The output capacitor connection to the LDO regulator
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
AAT3696 should use 2.2μF or greater values for the
LDO’s output capacitor.
Printed Circuit Board
Layout Recommendations
For proper thermal management and to take advantage
of the low RDS(ON) of the AAT3696, 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
AAT3696 TDFN3x3 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 the heat
being transferred to the PCB effectively.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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17
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Figure 3: AAT3696 Evaluation Board Top Layer.
Figure 4: AAT3696 Evaluation Board Bottom Layer.
LDO
+5
R3
D1
Red LED
EN
4V - 28V
VIN
GND
1k
R2
Green LED 1k
D2
JP1
5
8
2
1
2
C1
1μF
MODE
6
7
JP2
C4
2.2μF
U1
4
OVPFLG
STAT
EN
IC
LDOOUT
BATS
BAT
10
3
11
INCHR
IN
MODE
GND
AAT3696
1
2
12
INCHR
ISET
1
9
C3
10μF
C2
2.2μF
R1
1.6k
Figure 5: AAT3696 Evaluation Board Schematic.
18
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BAT
GND
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Component
Part Number
Description
Manufacturer
U1
R1
R2, R3
C1
C2, C4
C3
JP1, JP2
D1
D2
AAT3696IWP
Chip Resistor
Chip Resistor
GRM31MR71H105KA88
GRM188R61A225KE34
GRM21BR71A106KE51L
PRPN401PAEN
LTST-C190CKT
LTST-C190GKT
1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 Package
1.6kΩ, 1%, 1/4W; 0603
1kΩ, 5%, 1/4W; 0603
Ceramic 1μF 50V 10% X7R 1206
Ceramic 2.2μF 10V 10% X5R 0603
Ceramic 10μF 10V 10% X7R 0805
Conn. Header, 2mm zip
Red LED; 0603
Green LED; 0603
Skyworks
Vishay
Vishay
Murata
Murata
Murata
Sullins Electronics
Lite-On Inc.
Lite-On Inc.
Table 3: AAT3696 Evaluation Board Bill of Materials (BOM).
AAT3696 Feature Options
Product
Constant Voltage
Regulation (V)
OVP Trip Point
(V)
OVP Turn On Delay Time
(μs)
Preconditioning Voltage
Threshold (V)
AAT3696-1
AAT3696-2
AAT3696-3
AAT3696-4
AAT3696-5
AAT3696-6
AAT3696-7
AAT3696-8
AAT3696-9
AAT3696-10
AAT3696-11
AAT3696-12
AAT3696-13
AAT3696-14
AAT3696-15
AAT3696-16
4.2
4.2
4.375
4.375
4.2
4.2
4.375
4.375
4.2
4.2
4.375
4.375
4.2
4.2
4.375
4.375
6.75
6.75
6.75
6.75
6.25
6.25
6.25
6.25
6.75
6.75
6.75
6.75
6.25
6.25
6.25
6.25
40
80,000
40
80,000
40
80,000
40
80,000
40
80,000
40
80,000
40
80,000
40
80,000
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
Table 4: AAT3696 Options.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201897B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
19
DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2, 3
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
TDFN33-12
6EXYY
6FXYY
AAT3696IWP-1-T1
AAT3696IWP-2-T1
AAT3696IWP-3-T1
AAT3696IWP-4-T1
AAT3696IWP-5-T1
AAT3696IWP-6-T1
AAT3696IWP-7-T1
AAT3696IWP-8-T1
AAT3696IWP-9-T1
AAT3696IWP-10-T1
AAT3696IWP-11-T1
AAT3696IWP-12-T1
AAT3696IWP-13-T1
AAT3696IWP-14-T1
AAT3696IWP-15-T1
AAT3696IWP-16-T1
6GXYY
6HXYY
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.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. For detailed description of all options, refer to Table 4 on page 19.
20
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DATA SHEET
AAT3696
1.6A Li-Ion Battery Charger in a 3x3 TDFN Package
Package Information
TDFN33-121
Index Area
0.40 ± 0.05
Detail "A"
0.45 ± 0.05
2.40 ± 0.05
3.00 ± 0.05
0.1 REF
C0.3
3.00 ± 0.05
1.70 ± 0.05
Top View
Bottom View
0.23 ± 0.05
Pin 1 Indicator
(optional)
0.05 ± 0.05
0.23 ± 0.05
0.75 ± 0.05
Detail "A"
Side View
All dimensions in millimeters.
1. 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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