Skyworks AAT3698 1.6a linear li-ion battery charger in a 3x3 tdfn package Datasheet

DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
General Description
Features
The AAT3698-1/-2 BatteryManager™ is a single-cell lithium-ion (Li-Ion)/Li-Polymer battery charger IC designed
to operate from a USB port or AC adapter with an input
voltage of up to 7.0V. For increased safety, the AAT36981/-2 also includes over-voltage input protection (OVP)
up to 28V.
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•
The AAT3698-1/-2 precisely regulates battery voltage
for 4.2V Li-Ion/Polymer battery cells through a low
RDS(ON) switch. The charging current can be set by an
external resistor up to 1.6A. If an over-voltage condition
occurs from the input, the series switch quickly opens
and a fault flag is activated, preventing damage to the
battery and the charging circuitry.
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•
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•
•
•
•
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 AAT3698-1/-2 also includes a 5.0V LDO linear regulator with over-voltage protection that can supply loads
of up to 50mA.
USB or AC Adapter System Power Charger
3.0V ~ 7.0V Input Voltage Range
Fast Over-Voltage Protection Turn Off
OVP Trip Threshold: 7.25V (typ)
High Level of Integration with Internal:
▪ Power Device
▪ Reverse Current Blocking
▪ Current Sensing
5V/50mA LDO Output
Programmable Fast Charge Current from 50mA to
1.6A
Programmable Charge Termination Current
Charge Status Indicator
Power OK Indicator
Battery Absence Detection Input Pin
Automatic Termination and Recharge Sequencing
(AAT3698-1 Only)
Automatic Trickle Charge For Battery Pre-Conditioning
Emergency Thermal Shutdown Protection
Digitally Controlled Thermal Loop Regulation
Active Low Enable with Internal 200kΩ Pull-Down
Resistor
Output for Auto-Booting
14-pin 3x3mm TDFN Package
Applications
The AAT3698-1/-2 is available in the Pb-free, thermally
enhanced, space-saving 3x3mm TDFN33-14 package and
is rated over the -40°C to +85°C temperature range.
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•
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Bluetooth™ Headsets, Headphones, Accessories
Digital Still Cameras
Mobile Telephones
Personal Data Assistants (PDAs)
MP3 Players
Other Lithium-Ion/Polymer Battery-Powered Devices
Typical Application
10.9mm
IN
VIN
C1
1μF
NOBAT
BAT
INCHR
R1
EN
11.5mm
C4
ABI 1μF
ABO
IC
C2
1μF
ON/OFF
5V
Battery Pack
AAT3698-x
LDOOUT
R2
STAT
POK
LDOOUT
C3
1μF
ISET
TERM
GND
R3
R4
U1
C1
C2, C3
C4
R1
R2
R3
R4
AAT3698-x
GRM31MR71H105KA88
GRM188R61A225KE34
GRM21BR71C105KA01L
1.5kΩ, 5%, 1/4W, 0603
1.5kΩ, 5%, 1/4W, 0603
13.3kΩ, 1%, 1/4W, 0603
1.58kΩ, 1%, 1/4W, 0603
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
1
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Pin Description
Pin #
Name
Type
1
2
3
4
5
6
INCHR
IN
LDOOUT
POK
STAT
ABO
I/O
I
O
O
O
O
7
TERM
I
8
9
GND
EN
I
I
10
ISET
I
11
IC
I
12
NOBAT
I
13
14
EP
ABI
BAT
I
O
Function
OVP output switch and battery charger input; decouple to GND with 1μF capacitor.
Input from USB port or adapter connector.
5V/50mA LDO output through OVP device; bypass to GND with 1μF capacitor.
Power OK flag pin; open drain, active low.
Charge status indicator pin; open drain, active low.
Auto booting output.
Connect the RTERM resistor between the TERM pin and ground to set the charge termination
current. When the TERM pin is connected to INCHR, charge current termination level is set
to 10% of the programmed fast charge current.
Power ground.
Enable pin, active low. Internally connected to ground through a 200kΩ pull-down resistor.
Connect RSET resistor to this pin to set charging current. Connect a 10kΩ resistor from this
pin to the system to monitor this pin's voltage.
Internally connected; connect this pin to ground.
No battery detection input. If the NOBAT pin is left unconnected, charging is disabled. Internally pulled to LDOOUT pin through a 1.6MΩ pull-up resistor.
Auto booting input. Internally connected to ground through a 200kΩ pull-down resistor.
Connect to Li-Ion battery.
Exposed paddle; connect to ground.
Pin Configuration
TDFN33-14
(Top View)
INCHR
IN
LDOOUT
POK
STAT
ABO
TERM
2
1
14
2
13
3
12
4
11
5
10
6
9
7
8
BAT
ABI
NOBAT
IC
ISET
EN
GND
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Absolute Maximum Ratings1
Symbol
VIN
VP
VN
TJ
TA
TLEAD
Description
IN continuous
INCHR, EN, STATB, POK, ABI, NOBAT
BAT, ISET, TERM, LODOUT, ABO, 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 VINCHR + 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 (TDFN33-14)
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
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
3
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Electrical Characteristics1
VIN = 5V, RSET = 3.16kΩ, VENB = VNOBAT = 0V, CIN = 1μF, CINCHR = 1μF, CBAT = 1μF, CLDOOUT = 1μF, TERM = ABI = IC = open,
TA = -40 to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
Description
Operation
VIN_MAX
Input Over-Voltage Protection Range
VIN
Normal Operating Input Voltage Range
IOP
Operating Current
ISD
Charge Function Shutdown Supply Current
IBAT_LEAK
Leakage Current from BAT Pin
Over-Voltage Protection
Over-Voltage Protection Trip Voltage
VOVP
VOVP_HYS
Hysteresis
VIN_BAT_OS
VIN – VBAT Offset Voltage
Drop Out Voltage Between IN and INCHR Pins
VINCHR_DO
Battery Charger
VUVLO
Under-Voltage Lockout Threshold
VUVLO_HYS
Hysteresis
Drop Out Voltage Between INCHR and BAT
VCHG_DO
Pins
VBOVP
Battery Over-Voltage Protection Threshold
BAT Pin Voltage Regulation
Constant Regulated Output Voltage2
VCO(REG)
VCO/VCO
Constant Output Voltage Tolerance
Battery Recharge Voltage Threshold
(AAT3698-1 only)
VMIN
Preconditioning Voltage Threshold
Current Regulation
Charge Current Programmable Range
ICC_RANGE
VRCH
ICH_CC
Constant-Current Mode Charge Current
VISET
ISET Pin Voltage
ICH_TRK%
KISET
VTERM
VEXTERM_DIS
VEXTERM_EN
ITERM
ICH_TERM%
Trickle Charge Current Ratio
Conditions
Min
Typ
Max
Units
300
190
2
28
7.0
450
250
5
V
V
μA
μA
μA
7.25
200
300
200
200
7.45
V
mV
2.8
200
3.0
3.0
VBAT = 4.3V, RSET = 15.8kΩ
VENB = 5V, VBAT = 4.3V
VBAT = 4V, IN Pin Open
VIN Rising Edge
7.05
VIN Rising, VBAT = 4V
VIN Falling, VBAT = 4V
VIN = 5V, IBAT = 500mA, RSET = 1.58kΩ
VIN Rising Edge
2.6
VIN = 4.2V, IBAT = 500mA, RSET =
1.58kΩ
RISET = 31.6kΩ, IBAT = 10mA
RISET = 31.6kΩ, IBAT = 10mA, TA= 25°C
RISET = 31.6kΩ, IBAT = 10mA, TA= -40
to +85°C
RSET = 15.8kΩ, VBAT = 3.6V
RSET = 3.16kΩ, VBAT = 3.6V
RSET = 1.58kΩ, VBAT = 3.6V
TA = 25°C
VBAT = 3.6V
TA = -40 to +85°C
RSET = 3.16kΩ, VBAT = 2.0V
mV
mV
4.4
V
4.20
V
+0.5
-1
+1
%
2.4
VCO(REG)
- 0.1
2.6
2.8
V
100
-15%
-10%
-10%
1.97
1.9
1600
+15%
+10%
+10%
2.03
2.1
mA
100
500
1000
2
2
5
10
20
TERM Pin Voltage Range
External Termination Disable Threshold3
External Termination Enable Threshold4
TERM Pin Output Current
RSET = 15.8kΩ, VBAT = 3.6V
RSET = 3.16kΩ, VBAT = 3.6V
From off to full charge
VIN = 5V, measured on TERM pin
VIN = 5V, measured on TERM pin
VTERM = 0.2V
-10%
15
3.5
+10%
Charge Termination Threshold Current Ratio
VTERM = 0.2V or tied to INCHR pin
5
10
20
Charge Current Set Factor: ICH_CC/IISET
V
mV
100
-0.5
VBAT falling
VBAT rising
mV
mA
V
V
% of
ICH_CC
790
790
0
4.8
2.0
V
V
V
μA
% of
ICH_CC
1. The AAT3698-1/-2 is guaranteed to meet performance specifications over the -40 to +85°C operating temperature range and is assured by design, characterization and correlation with statistical process controls.
2. When no battery is connected, the BAT pin output voltage is regulated at 4.2V.
3. Internal Termination function is selected when VTREM > VEXTREM_DIS.
4. External Termination function is selected when VTREM < VEXTREM_EN.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Electrical Characteristics (continued)1
VIN = 5V, RSET = 3.16kΩ, VENB = VNOBAT = 0V, CIN = 1μF, CINCHR = 1μF, CBAT = 1μF, CLDOOUT = 1μF, TERM = ABI = IC = open,
TA = -40 to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
Description
Logic Control / Battery Protection
VEN(H)
Input High Threshold
VEN(L)
Input Low Threshold
REN
Input Pull Down Resistor
VNOBAT(H)
Input High Threshold
VNOBAT(L)
Input Low Threshold
RNOBAT
Input Pull Up Resistor
VABI(H)
Input High Threshold
VABI(L)
Input Low Threshold
RABI
Input Pull Down Resistor
VABO(H)
Output High Voltage
VABO(L)
Output Low Voltage
VSTAT
Output Low Voltage
ISTAT_OFF
STAT Pin Leakage Current
VPOK
Output Low Voltage
IPOK_OFF
POK Pin Leakage Current
TOVPRES
Over-Voltage Response Time
OVP Switch OVP Release Turn-On
Delay Time
POK OFF Delay Time from OverTDLY_POK
Voltage
POK ON Delay Time from OverTREDLY_POK
Voltage
OVP Switch Startup Turn-On Delay
TOVPSTARTON
Time
Thermal Protection
THREG
Thermal Loop Regulation
Chip Thermal Shutdown
THSHDN
Temperature
5V LDO
TOVPON
VLDOOUT
LDOOUT Voltage Tolerance
VDO
IOUT_LIM
VLDOOUT_LR
VLDOOUT_DM LR
VLDOOUT_DM LD
Dropout Voltage from IN
LDO Output Current Limit
Line Regulation
Dynamic Line Regulation
Dynamic Load Regulation
Conditions
Min
Typ
Max
1.2
0.4
200
1.2
0.4
1600
VIN = 0V, VBAT = 4.2V
VIN = 0V, VBAT = 4.2V
1.2
0.4
200
VBAT = 4.2V, IABO = -5mA (sourcing)
VBAT = 4.2V, IABO = 5mA (sinking)
VBAT – 1V
0.4
0.4
1
0.4
1
VSTAT = 5.5V, VEN = 5V
IPOK = 5mA
VPOK = 5.5V, VIN = 7V
VIN voltage step up from 6V to 8V, RLOAD =
100Ω, CINCHR = 1μF
VIN voltage step down from 8V to 6V, RLOAD =
100Ω, CINCHR = 1μF
VIN voltage step up from 6V to 8V, RLOAD =
100Ω, CINCHR = 1μF
VIN voltage step down from 8V to 6V, RLOAD =
100Ω, CINCHR = 1μF
VIN voltage step up from 0V to 5V, RLOAD =
100Ω, CINCHR = 1μF
Threshold
Hysteresis
TA = 25°C
VIN = 5.5V, ILDOOUT
= 0mA to 30mA
TA = -40 to +85°C
IOUT = 30mA, VIN = 5.0V
VIN = 5.5V, VLDOOUT = 4.5V
VIN = 5.4V to 6.4V, ILDOOUT = 30mA
IOUT = 30mA, VIN = 5.4V to 6.4V, TR/TF = 2μs
IOUT = 1mA to 30mA, TR = <5μs, VIN = 5.5V
4.9
4.75
55
Units
V
V
k
V
V
k
V
V
k
V
V
V
μA
V
μA
0.1
μs
60
μs
0.1
μs
1.5
μs
220
μs
110
140
15
ºC
ºC
5.0
5.0
160
90
5.1
5.25
300
125
10
200
60
V
mV
mA
mV
mV
mV
1. The AAT3698-1/-2 is guaranteed to meet performance specifications over the -40 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
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
5
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Constant Charging Current vs.
RSET Resistor Values
Operating Current vs. RSET Resistor Values
2400
10000
Operating Current (mA)
Constant Charging Current (mA)
Typical Characteristics−Battery Charger
1000
100
10
1
0.1
1
10
Preconditioning Mode
Constant Current Mode
2100
1800
1500
1200
900
600
300
0
0.1
100
1
10
RSET (KΩ
Ω)
Battery Charging Current vs. Temperature
Battery Charging Current vs. Temperature
(RSET = 3.16KΩ; ICH_CC = 500mA)
Battery Charge Current (mA)
Battery Charge Current (mA)
(RSET = 1.58KΩ; ICH_CC = 1000mA)
1100
1080
1060
1040
1020
1000
980
960
940
920
900
-40
-15
10
35
60
85
550
540
530
520
510
500
490
480
470
460
450
-40
-15
10
Temperature (°C)
950
900
850
VBAT = 3.3V
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.1V
800
750
5.2
5.5
5.8
6.1
Input Voltage (V)
6
6.4
6.7
7.0
Battery Charging Current (mA)
Battery Charging Current (mA)
1000
4.9
85
(RSET = 3.16KΩ)
1050
4.6
60
Battery Charging Current vs. Input Voltage
(RSET = 1.58KΩ)
4.3
35
Temperature (°C)
Battery Charging Current vs. Input Voltage
700
4.0
100
RSET (KΩ
Ω)
560
540
520
500
480
460
VBAT = 3.3V
VBAT = 3.6V
VBAT = 3.9V
VBAT = 4.1V
440
420
400
4.0
4.3
4.6
4.9
5.2
5.5
5.8
6.1
6.4
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
6.7
7.0
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Characteristics−Battery Charger
Shutdown Current vs. Input Voltage
1200
RSET = 1.5KΩ
RSET = 1.96KΩ
1000
RSET = 2.61KΩ
RSET = 3.16KΩ
300
RSET = 7.87KΩ
Shutdown Current (μA)
Battery Charging Current (mA)
Battery Charging Current vs. Battery Voltage
800
600
400
200
0
2.2
2.5
2.8
3.1
3.4
3.7
4.0
260
220
180
85°C
25°C
-40°C
140
100
5.0
4.3
5.5
Battery Voltage (V)
Preconditioning Charge Current
vs. Temperature
7.0
(RSET = 3.16KΩ; ICH_CC = 500mA)
Preconditioning Charge
Current (mA)
Preconditioning Charge
Current (mA)
(RSET = 1.58KΩ; ICH_CC = 1000mA)
106
102
98
94
55
54
53
52
51
50
49
48
47
46
45
-15
10
35
60
85
-40
-15
Temperature (°C)
10
35
60
85
Temperature (°C)
Constant Output Voltage vs. Temperature
Constant Output Voltage vs. Temperature
(RSET = 1.58KΩ; ICH_CC = 1000mA)
(RSET = 3.16KΩ; ICH_CC = 500mA)
4.31
Constant Output Voltage (V)
Constant Output Voltage (V)
6.5
Preconditioning Charge Current
vs. Temperature
110
90
-40
6.0
Input Voltage (V)
4.28
4.25
4.22
4.19
4.16
4.13
4.10
-40
-15
10
35
Temperature (°C)
60
85
4.31
4.28
4.25
4.22
4.19
4.16
4.13
4.10
-40
-15
10
35
60
85
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
7
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Characteristics−Battery Charger
Enable Low Voltage vs. Input Voltage
Enable High Voltage vs. Input Voltage
0.910
Enable High Voltage (V)
Enable Low Voltage (V)
0.80
0.78
0.76
0.74
0.72
85°C
25°C
-40°C
0.70
0.68
5.0
5.2
5.4
5.6
5.8
6.0
6.2
6.4
6.6
6.8
0.905
0.900
0.895
0.890
85°C
25°C
-40°C
0.885
0.880
5.0
7.0
5.2
5.4
Input Voltage (V)
6.0
6.2
6.4
6.6
6.8
7.0
Battery Recharge Voltage Threshold
vs. Temperature
(RSET = 1.58KΩ; ICH_CC = 1000mA; AAT3698-1)
(RSET = 3.16KΩ; ICH_CC = 500mA; AAT3698-1)
4.20
Battery Recharge
Voltage Threshold (V)
4.20
Battery Recharge
Voltage Threshold (V)
5.8
Input Voltage (V)
Battery Recharge Voltage Threshold
vs. Temperature
4.18
4.16
4.14
4.12
4.10
4.08
4.06
4.04
4.02
4.00
-40
5.6
-15
10
35
60
4.18
4.16
4.14
4.12
4.10
4.08
4.06
4.04
4.02
4.00
-40
85
Temperature (°C)
-15
10
35
60
85
Temperature (°C)
Typical Characteristics−OVP
OVP On Time
OVP Response Time
(RLOAD = 100Ω)
(RLOAD = 100Ω)
6.0
5.0
6
4
2
0
-2
Time (50μs/div)
8
Input Voltage (top) (V)
Input Voltage (top) (V)
7.0
9.0
8.0
7.0
6.0
6
5.0
4
2
0
-2
Time (50μs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
INCHR Voltage (bottom) (V)
8.0
INCHR Voltage (bottom) (V)
9.0
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Characteristics−OVP
OVP Trip Point Threshold Voltage
vs. Temperature
POK ON Delay Time
(RLOAD = 100Ω)
Input Voltage (top) (V)
9.0
7.20
7.15
7.10
7.05
7.00
6.95
-40
Rising Threshold
Falling Threshold
-15
10
8.0
7.0
6
6.0
4
2
0
-2
-4
35
60
POK Voltage (bottom) (V)
OVP Trip Point
Threshold Voltage (V)
7.25
85
Temperature (°C)
Time (2μs/div)
LDO Load Transient
LDO Load Transient
(VIN = 5.4V; IOUT = 1mA to 30mA; COUT = 1μF)
(VIN = 5.4V; IOUT = 10mA to 30mA; COUT = 1μF)
300
40
250
20
200
20
0
100
50
0
Output Current
(top) (mA)
60
40
0
150
-20
100
-40
50
-60
0
-50
-80
-50
-100
-100
-100
Time (100μs/div)
Output Voltage
(bottom) (mV)
60
Output Voltage
(bottom) (mV)
Output Current
(top) (mA)
Typical Characteristics−LDO
Time (100μs/div)
LDO Line Transient
(VIN = 5.4V to 6.4V; IOUT = 30mA; COUT = 1μF)
6
5
5.1
5
4.9
4.8
Output Voltage
(bottom) (V)
Input Voltage
(top) (V)
7
4.7
4.6
Time (100μs/div)
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9
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Typical Characteristics−LDO
LDO Output Voltage vs. Temperature
(IOUT = 10mA)
(IOUT = 10mA)
0.500
5.010
0.400
LDO Output Voltage (V)
LDO Output Voltage Error (%)
LDO Output Voltage Accuracy vs. Temperature
0.300
0.200
0.100
0.000
-0.100
-0.200
-0.300
-0.400
-0.500
-40
-15
10
35
60
5.005
5.000
4.995
4.990
4.985
4.980
-40
85
-15
Temperature (°C)
LDO Output Voltage Accuracy vs. Input Voltage
LDO Output Voltage Error (%)
Output Voltage Error (%)
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
85°C
25°C
-40°C
-0.6
-0.8
5.6
5.8
6.0
6.2
60
85
(VIN = 5.5V)
1.0
5.4
35
LDO Output Voltage Accuracy vs. Output Current
(IOUT = 30mA)
-1.0
5.2
10
Temperature (°C)
6.4
6.6
6.8
7.0
1
85°C
25°C
-40°C
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0.1
1.0
Input Voltage (V)
10
100
Output Current (mA)
Dropout Voltage vs. Output Current
Dropout Voltage vs. Temperature
(IOUT = 30mA)
250
Dropout Voltage (mV)
Dropout Voltage (mV)
250
200
150
100
85°C
25°C
-40°C
50
0
0
5
10
15
20
25
Output Current (mA)
10
30
35
200
150
100
50
0
-40
-15
10
35
60
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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85
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Functional Block Diagram
Reverse
Blocking
OVP
Switch
BAT
IN
OVP
Control
LDOOUT
5V LDO
INCHR
1600kΩ
TERM
NOBAT
Current
Sense
ISET
BATS
BAT
POK
EN
Charge
Control
200kΩ
ABO
UVLO
ABI
OVP Flag
200kΩ
POK
POK
STAT
+
-
IN
BAT
GND
Functional Description
Preconditioning Charge
The AAT3698-1/-2 is a high performance battery charger
IC which is designed to charge single-cell Lithium-Ion or
Polymer batteries with up to 1.6A of current from an
external power source. It is a stand-alone charging solution requiring minimum input components. The AAT36981/-2 also includes a fast turn-off over-voltage protection
(OVP) circuit with +28V which consists of a low-resistance MOSFET in series with the charge control circuit.
The AAT3698-1/-2 also features under-voltage lockout
protection, power OK, charge status monitoring, and a
5.0V LDO with 50mA output through the OVP switch.
Battery charging commences only after the AAT3698-1/2 checks several conditions in order to maintain a safe
charging environment. The input supply must be above
the minimum operating voltage (VMIN) 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 AAT3698-1/-2 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 AAT3698-1/-2 begins preconditioning the cell (trickle charging) by charging at 10%
of the programmed constant current. For example, if the
programmed fast charge current is 1000mA, then the
preconditioning (trickle) charge current is 100mA.
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 Profile
Figure 1 illustrates the entire battery charging operation
profile, which consists of three (AAT3698-2) or four
(AAT3698-1) phases:
1.
2.
3.
4.
Preconditioning (Trickle) Charge
Constant Current Charge (CC)
Constant Voltage Charge (CV)
Automatic Recharge (AAT3698-1 only)
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11
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Constant Current Fast Charge
Battery cell preconditioning charge continues until the
battery voltage reaches the preconditioning voltage
threshold (VMIN). At this point, the AAT3698-1/-2 begins
the constant current charge phase. The current level for
this mode is programmed using a single resistor from the
ISET pin to ground. The programmed current can be set
from a minimum of 100mA up to a maximum of 1.6A.
Constant Voltage Charge
Constant current charging will continue until the battery
voltage reaches the constant output voltage, VCO. The
AAT3698-1/AAT3698-2 then transitions to constant voltage mode, in which the charge IC regulates the battery
voltage to a constant output voltage (factory programmed
to 4.2V). The charging current decreases during this
phase. The charger regulates battery voltage at 4.2V and
continues to charge the battery until the charge current
reaches the termination level set by RTERM. When the
charge current reaches its termination level ITERM, charging is terminated.
AAT3698-1
The charger turns off the series pass device even if the
EN pin is held low and the device automatically enters a
power-saving sleep state. During this time, the series
pass device blocks current in both directions, preventing
the battery from discharging through the IC. The device
remains in sleep mode even if the charger source is disconnected. When the battery terminal voltage drops
below the VRCH threshold, the AAT3698-1 resumes charging operation if no fault is detected.
AAT3698-2
The charger regulates the battery voltage at 4.2V and
continues to charge the battery with a current lower
than the charge termination current until a logic high is
applied to the EN pin to stop charging.
V CO(REG)
ICH _CC
V MIN
Battery
Voltage
ICH _TRK
I CH _TERM
Charger Turns OFF when
I CH_CC = I CH_TERM (AAT3698-1)
Battery
Current
STAT
Preconditioning Charge
Constant Current Charge
STAT
Turns
OFF
Charger Turns OFF when
EN = high (AAT3698-2)
Constant Voltage Charge
EN
Figure 1: AAT3698-1/-2 Battery Charging Profile.
12
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DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Enable / Disable
Power Fail
STAT = POK = high
POK = high
POK = low
Charger Off
Any States
STAT = high,
POK = low
EN = high or VIN ≤ VBAT or VBOVP ≤ VBAT
EN = low & VIN ≥ VBAT ≤ VBOVP
Charge Complete
Pre-Charge
STAT = high, POK = low
Charge Off for AAT3698-1
Charge On for AAT3698-2
STAT = POK = low
VBAT < VMIN
VBAT < VRCH
(AAT3698-1 only)
VBAT ≥ VMIN
Fast Charge
VBAT ≥ VCO(REG)
STAT = POK = low
IBAT = ITERM
Voltage Mode
Charge
STAT = POK = low
TLOOP
TLOOP
Figure 2: Charger Operational State Diagram.
Charge Status Output
The AAT3698-1/-2 provides battery charging status via
the charge status indication pin (STAT). This pin is internally connected to an N-channel open-drain MOSFET,
which can be used as a logic signal or to drive an external LED. The STAT pin pulls high to indicate charge
completion. The charge completion occurs only when the
EN pin is pulled high or the charge current reaches its
charge termination current level. The status pin indicates
the conditions as described in Table 1.
Charge Status
VIN > VUVLO
VIN > VOVP
The charge current is below its termination level
EN pin is pulled high
Battery is charging and the charge current is above
its termination level.
Table 1: LED Status Indicator.
STAT
High
High
High
High
Low
The AAT3698-1/-2 provides an enable function to turn the
charger IC on and off. The enable (EN) pin is internally
pulled down with 200kΩ. When EN is pulled down or left
floating, the device begins normal operation. When EN is
pulled to a logic high level, the AAT3698-1/-2's charging
circuit will be shut down and forced into sleep state. The
over-voltage protection/LDO circuit remains active even
in sleep state. In sleep state, charging is halted regardless
of the battery voltage or charging state. When the device
is re-enabled, the charge control circuit automatically
resets and resumes charging functions with the appropriate charging mode based on the battery charge state and
measured cell voltage at the BAT pin.
Under-Voltage Lockout (UVLO)
The AAT3698-1/-2 has a typical under-voltage lockout
threshold of 3V. When the input voltage is less than the
UVLO level, OVP and the charger are turned off. The
UVLO is designed with 150mV hysteresis to ensure circuit
stability.
Over-Voltage Protection
In normal operation, the OVP protection device 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, VOVP, the switch immediately turns off and disconnects the load and the charger from the power source
and preventing damage to any downstream components.
Simultaneously, the fault flag is raised, alerting the system. If an over-voltage condition is applied at the time of
the device enable, the switch remains open (OFF).
Power OK Output Flag
The Power OK flag (POK) is an active-low open-drain
power good reporting output. A pull-up resistor should
be connected from POK to another system power voltage. In the event of an under-voltage or over-voltage
condition, POK will be de-asserted. After the over-voltage fault is released, POK will be asserted. POK will be
also de-asserted when VIN is lower than VBAT when
EN is low. When EN is high, POK is asserted only after
UVLO and OVP conditions.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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13
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Power Status
VIN < VBAT
VUVLO ≤ VBAT
POK
VIN < VUVLO
VIN > VOVP
+ VIN_BAT_OS, EN = low
+ VIN_BAT_OS ≤ VIN ≤ VOVP
High
High
High
Low
protection threshold (VBOVP). If an over-voltage condition
is sensed by the BATS pin, the AAT3698-1/-2 charge
control shuts down the device until the voltage at the
BAT pin drops below VBOVP. The AAT3698-1/-2 resumes
normal charging operation after the over-voltage condition is removed.
Table 2: POK Flag Indicator.
Digital Thermal Loop Control
Automatic Booting
An auxiliary OR gate provides a booting enable signal
from two inputs, an internal power OK signal and an
external ABI signal. The ABO states are listed in Table 3.
VBAT
POK
ABI
ABO
Yes
Yes
Yes
No
Low
High
High
X
X
High
Low
X
High
High
Low
Low
Table 3: Automatic Booting.
Battery Detection
When the NOBAT pin is set to logic high level, the charger is disabled. When it is set to logic low level, the
charger is enabled. This pin is internally pulled to the
LDOOUT pin through a 1.6MΩ resistor.
The AAT3698-1/-2 includes a thermal management system. The system is activated when the die temperature
reaches its preset internal temperature threshold (110°C)
and maintains the die temperature by reducing the constant charge current.
Over-Temperature Shutdown
The AAT3698-1/-2 has a thermal protection control circuit which shuts down charging functions if the internal
die temperature exceeds the preset thermal limit threshold (140°C). Once the internal die temperature falls
below the thermal limit, normal operation resumes in the
previous charging state.
Linear Dropout Regulator
The AAT3698-1/-2's linear dropout regulator output
(LDOOUT) provides 5V output with 30mA typical load
current capabilities.
Battery Over-Voltage Protection
IC Input
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
The AAT3698-1/-2 has an IC input pin that is internally
connected to ground through a 100kΩ resistor. Float or
ground this pin for normal operation.
14
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DATA SHEET
AAT3698
Application Information
Constant Charge Current
The constant current charge level is user programmed
with a set resistor connected between the ISET pin and
ground. The tolerance of the set resistor determines the
accuracy of the constant charge current as well as the
preconditioning trickle charge current. For this reason, a
1% tolerance metal film resistor is recommended for the
set resistor function. The constant charge current level
from 100mA to 1.6A is set by selecting the appropriate
resistor value from Table 4.
Constant Charging Current (mA)
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
VISET
· KISET = VISET · GMOUT
RISET
Where:
GMOUT =
ICH_CC_TYP KISET
=
= 250ms
VISET
RSET
1000
100
10
1
0.1
50
100
200
400
500
600
800
1000
1580
31.6
15.8
7.87
3.92
3.16
2.67
1.96
1.58
1.00
Table 4: RSET Values
Figure 3 shows the relationship of constant charging current and set resistor values for the AAT3698-1/-2.
100
Charge Termination Current
The charge termination current level is programmed by
an external resistor (RTERM) connected between the TERM
pin and ground. Use the resistor values listed in Table 5
to set the desired charge termination current.
RTERM (KΩ)
ICH_TERM (%)
6.65
13.3
26.7
40.2
53.6
5%
10%
20%
30%
40%
Table 5: Charge Termination Current
Programming Resistor Values.
50%
40%
ICH_TERM (%)
Set Resistor Value
(kΩ)
10
Figure 3: Constant Charging Current vs.
Set Resistor Values.
When RSET = 3.16kΩ and KISET = 790.
Typical Constant Charge
Current (mA)
1
RSET (KΩ
Ω)
The approximate charge current (ICH_CC_typ) can be found
using the following formula:
ICH_CC_TYP =
10000
30%
20%
10%
0%
0
10
20
30
40
50
60
RTERM (kΩ
Ω)
Figure 4: Charge Termination Current vs. RTERM.
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15
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Use the following formula to set the charge termination
current, ICH_TERM.
ICH_TERM =
15μA · RTERM
· ICH_CC
2V
ICH_TERM is set by default to 10% of ICH_CC when the TERM
pin is connected to the INCHR pin.
When the charge current reaches the termination current,
the STAT pin will be set to high impedance, but the charge
termination current will continue to flow until the EN pin
is toggled high. To set charge termination current threshold to the lowest level, connect the TERM pin to ground.
Battery Connection
A single cell Li-Ion/Polymer battery should be connected
between the BAT pin and ground.
Status Indicator Display
Example:
RB(STAT) =
5.5V - 2.0V
= 1.75kΩ
2mA
Note: Red LED forward voltage (VF) is typically 2.0V @
2mA.
When connecting to the USB supply with a green LED:
RB(STAT) =
VUSB - VF(LED)
ILED(STAT)
Example:
RB(STAT) =
5.0V - 3.2V
= 900Ω
2mA
Note: Green LED forward voltage (VF) is typically 3.2V @
2mA.
Capacitor Selection
Input Capacitor (IN)
Simple system charging status can be displayed using a
single LED in conjunction with the AAT3698-1/-2's STAT
pin. 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
INCHR or other system power supply that does not
exceed 7V, 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 lowcost green or red LEDs. Driving an individual status LED
with over 8mA is not recommended.
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.
The required ballast resistor value can be estimated
using the following formulas:
Charger Input Capacitor (INCHR)
When connecting to the adapter supply with a red LED:
RB(STAT) =
16
VADP - VF(LED)
ILED(STAT)
Typically, 50V rated capacitors are required for the application to prevent any surge voltage. Ceramic capacitors
selected as small as 1206 are available which can meet
these requirements. Capacitors with other voltage rating
can also be used for known input voltage applications.
A 1μF decoupling capacitor is recommended to be placed
between INCHR and GND. This capacitor should be located as closely and routed as directly as practically possible
to the device's INCHR pin with a good ground return path
for maximum device over-voltage protection performance.
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201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Charger Output Capacitor (BAT)
The AAT3698-1/-2 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 at any distance from the charger output.
If the AAT3698-1/-2 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 (LDOOUT)
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, multilayer ceramic capacitors in the 1.0μF to
10μF range are recommended for best performance.
Applications utilizing the exceptionally low output noise
and optimum power supply ripple rejection of the
AAT3698-1/-2 should use a value of 2.2μF or greater 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 AAT3698-1/-2, 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 AAT3698-1/-2 TDFN33-14 package, solder the
exposed paddle of the IC to 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 via holes on the thermal landing
would help transfer heat to the PCB effectively.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
17
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
18
Figure 5: AAT3698-1/-2 Evaluation Board
Top Side Layout.
Figure 6: AAT3698-1/-2 Evaluation Board
Mid1 Layer Layout.
Figure 7: AAT3698-1/-2 Evaluation Board
Mid2 Layer Layout.
Figure 8: AAT3698-1/-2 Evaluation Board
Bottom Side Layout.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
5V
TP6
JP2
NOBAT
U1
VIN
GND
1
2
C1
1μF
2
IN
1
INCHR
NOBAT
12
BAT
14
TP1
9
JP1
5V
D1
R1
Red LED
D2
TP2
EN
ABI
IC
11
Green LED
4
POK
ISET
R2
5
STAT
GND
TERM
TP4
ABI
R6 (optional)
3
LDOOUT
10
TP3
C3
1μF
7
R3
13.3k
AAT3698-TDFN33-14
8
C1
C2, C3, C4
+5
R5 (optional)
6
13
LDOOUT
+5
TP5
AAT3698-X
ABO
EN
BAT
BATGND
ABO
C2
1μF
INCHR
1
2
C4
1μF
R4
3.16k
1206 X7R 1μF 50V GRM31MR71H105KA88
0603 X5R 1μF 10V GRM188R61A105KE34
Figure 7: AAT3698-1/-2 Evaluation Board Schematic.
Component
Part Number
Description
Manufacturer
U1
C1
C2, C3, C4
R1, R2
R3
R4
R5
R6
D1
D2
JP1, JP2
AAT3698IWO-1/-2
GRM31MR71H105KA88
GRM188R61A105KE34
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
Chip Resistor
LST-C190CKT
LST-C190GKT
PRPN401PAEN
1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-14 Package
Ceramic 1μF/50V, 10%, X7R, 1206
Ceramic 1μF/10V, 10%, X5R, 0603
1.5kΩ, 5%, 1/4W, 0603
13.3kΩ, 1%, 1/4W, 0603
1.58kΩ, 1%, 1/4W, 0603
10kΩ, 1%, 1/4W, 0603
0Ω, 5%, 1/4W, 0603
Red LED, 0603
Green LED, 0603
Conn. Header, 2mm zip
Skyworks
Murata
Murata
Vishay
Vishay
Vishay
Vishay
Vishay
Lite-On Inc.
Lite-On Inc.
Sullins Electronics
Table 6: AAT3698-1/-2 Evaluation Board Bill of Materials (BOM).
Product
Constant Regulated
Output Voltage (V)
Automatic Charge Termination
and Recharge Sequencing
when IBAT ≤ ITERM
Input OVP
Trip Point (V)
Preconditioning
Voltage Threshold (V)
AAT3698-1
AAT3698-2
4.2
4.2
Yes
No
7.25
7.25
2.6
2.6
Table 7: AAT3698 Options.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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19
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Ordering Information
Product
Package
Marking1
Part Number (Tape and Reel)2
AAT3698-1
AAT3698-2
TDFN33-14
TDFN33-14
A5XYY
D6XYY
AAT3698IWO-4.2-1-T1
AAT3698IWO-4.2-2-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.
Package Information
TDFN33-14
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"
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
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