1A USB Port Lithium-Ion/
Polymer Battery Charger
General Description
The AAT3688A BatteryManager™ is a highly inte-
grated single cell lithium-ion/polymer battery
charger IC designed to operate with USB port
inputs. It requires the minimum number of external
components.
The AAT3688A precisely regulates battery charge
voltage and current for 4.2V lithium-ion/polymer
battery cells. Depending on the USB port type, the
AAT3688A charge current can be programmed for
two separate levels up to 1A. An optional Charge
Reduction Loop is built in to allow users to charge
the battery with available current from a USB port,
while keeping the port voltage regulated.
Battery temperature and charge state are fully
monitored for fault conditions. In the event of an
over-voltage or over-temperature failure, the
device will automatically shut down, thus protecting
the charging device, control system, and the bat-
tery under charge. Status monitor output pins are
provided to indicate the battery charge status by
directly driving two external LEDs. A serial interface
output is available to report any one of 14 various
status states to a microcontroller.
The AAT3688A is available in a Pb-free, thermally-
enhanced, space-saving 12-pin 3x3mm TDFN
package and is rated over the -40°C to +85°C tem-
perature range.
AAT3688A
Features
•
•
•
BatteryManager
™
•
•
•
•
•
•
•
•
•
USB Charger
— Programmable up to 1A Max
4.0V to 5.5V Input Voltage Range
High Level of Integration With Internal:
— Charging Device
— Reverse Blocking Diode
— Current Sensing
Automatic Recharge Sequencing
Charge Reduction Loop for USB Charging
Battery Temperature Monitoring
Full Battery Charge Auto Turn-Off
Over-Voltage Protection
Emergency Thermal Protection
Power On Reset and Soft Start
Serial Interface Status Reporting
12-Pin 3x3mm TDFN Package
Applications
•
•
•
•
•
•
Cellular Telephones
Digital Still Cameras
Hand-Held PCs
MP3 Players
Personal Data Assistants (PDAs)
Other Lithium-Ion/Polymer Battery-Powered
Devices
Typical Application
Enable
USB Input
USB Hi/Lo Select
USB
USBSEL
USBH
R
SETH
R
SETL
USBL
BAT
TS
C2
10μF
EN
CHR
BATT+
AAT3688A
GND
BATT-
DATA
STAT1
STAT2
TEMP
Battery Pack
Serial Data
3688A.2006.12.1.7
1
1A USB Port Lithium-Ion/
Polymer Battery Charger
Pin Descriptions
Pin #
1
2
3
4
AAT3688A
Name
USB
BAT
GND
CHR
Type
In
In/Out
Ground
In/Out
Function
USB power supply input.
Battery charging and sensing.
Ground connection.
Resistor divider to set USB voltage regulation for charge reduction mode.
Leave this pin open for default 4.5V USB regulation point. Tie to USB pin to
disable this function.
Enable pin. Logic high enables the IC.
Connect to 10kΩ NTC thermistor.
Status report to microcontroller via serial interface, open-drain.
Battery charge status indicator pin to drive an LED: active low, open-drain.
Battery charge status indicator pin to drive an LED: active low, open-drain.
When USB is present, use this pin to toggle between USBH and USBL
charging levels.
Connect resistor here to set charge current for low-current USB port.
Connect resistor here to set charge current for high-current USB port.
Exposed paddle (bottom); connect to GND directly beneath package.
5
6
7
8
9
10
11
12
EP
EN
TS
DATA
STAT2
STAT1
USBSEL
USBL
USBH
In
In/Out
In/Out
Out
Out
In
In/Out
In/Out
Pin Configuration
TDFN33-12
(Top View)
USB
BAT
GND
CHR
EN
TS
1
2
3
4
5
6
12
11
10
9
8
7
USBH
USBL
USBSEL
STAT1
STAT2
DATA
2
3688A.2006.12.1.7
1A USB Port Lithium-Ion/
Polymer Battery Charger
AAT3688A Feature Options
Product
AAT3688A
AAT3688A-3
AAT3688A
Battery Recharge
Voltage Threshold
Always active
Active only after charge completed
Absolute Maximum Ratings
1
Symbol
V
P
V
P
V
N
T
J
T
LEAD
Description
USB Input Voltage, <30ms, Duty Cycle <10%
USB Input Voltage, Continuous
BAT, USBSEL, USBH, USBL, STAT1, STAT2, DATA, TS, CHR, EN
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads)
Value
-0.3 to 7.0
-0.3 to 6.1
-0.3 to V
P
+ 0.3
-40 to 150
300
Units
V
V
V
°C
°C
Thermal Information
2
Symbol
θ
JA
P
D
Description
Maximum Thermal Resistance
Maximum Power Dissipation
Value
50
2.0
Units
°C/W
W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions 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.
3688A.2006.12.1.7
3
1A USB Port Lithium-Ion/
Polymer Battery Charger
Electrical Characteristics
1
V
USB
= 5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= 25°C.
Symbol
Operation
USB
AAT3688A
Description
Conditions
Min
4.0
Typ
Max Units
5.5
V
V
mV
mA
µA
µA
4.242
3.15
4.64
2.1
1000
V
%
V
V
V
V
mA
%
V
V
Input Voltage Range
Under-Voltage Lockout
V
UVLO
Under-Voltage Lockout Hysteresis
I
OP
Operating Current
I
SLEEP
Sleep Mode Current
Reverse Leakage Current from
I
Leakage
BAT Pin
Voltage Regulation
V
BAT_EOC
1
End of Charge Voltage Accuracy
ΔV
BAT
/V
BAT
EOC Voltage Tolerance
V
MIN
Preconditioning Voltage Threshold
V
RCH
Battery Recharge Voltage Threshold
V
USB_CHR
USB Charge Reduction Regulation
V
CHR
CHR Pin Voltage Accuracy
Current Regulation
I
CH
Charge Current
Charge Current Regulation
ΔI
CH
/I
CH
Tolerance
V
USBH
USBH Pin Voltage
V
USBL
USBL Pin Voltage
K
IUH
Current Set Factor: I
CHARGE
/I
USBH
K
IUL
Current Set Factor: I
CHARGE
/I
USBL
Charging Devices
USB Charging Transistor
R
DS(ON)U
On Resistance
Rising Edge
CC Charge Current = 500mA
V
BAT
= 4.25V
V
BAT
= 4V, USB Pin Open
4.158
2.8
No Connection on CHR Pin
4.3
1.9
50
3.0
150
0.75
0.3
1.0
4.2
0.5
3.0
V
BAT_EOC
- 0.1
4.5
2.0
1.5
1.0
10
CC Mode
CC Mode
2.0
2.0
2000
2000
0.4
0.5
0.65
V
IN
= 5.5V
Ω
1. The AAT3688A output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -40°C to +85°C
temperature range is guaranteed by design.
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3688A.2006.12.1.7
1A USB Port Lithium-Ion/
Polymer Battery Charger
Electrical Characteristics
1
V
ADP
= 5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= 25°C.
Symbol
Description
Conditions
Min Typ
1.6
0.4
1.6
STAT Pin Sinks 4mA
8.0
4.4
10
50
7.5
35
80
330
15
2.3
10
0.4
0.4
AAT3688A
Max
Units
V
V
V
V
V
mA
V
%
%
Logic Control / Protection
V
USBSEL(H)
Input High Threshold
V
USBSEL(L)
Input Low Threshold
V
EN(H)
Input High Threshold
V
EN(L)
Input Low Threshold
V
STAT
Output Low Voltage
I
STAT
STAT Pin Current Sink Capability
V
OVP
Over-Voltage Protection Threshold
I
TK
/I
CHG
I
TERM
/I
CHG
I
TS
TS1
TS2
I_DATA
V
DATA(H)
V
DATA)(L)
SQ
PULSE
t
PERIOD
f
DATA
T
OVSD
Pre-Charge Current
Charge Termination Threshold Current
Current Source from TS Pin
2
TS Hot Temperature Fault
2
TS Cold Temperature Fault
2
DATA Pin Sink Current
Input High Threshold
Input Low Threshold
Status Request Pulse Width
System Clock Period
Data Output Frequency
Over-Temperature Shutdown Threshold
For
For
For
For
USBH Mode
USBL Mode
USBH Mode
USBL Mode
76
315
2.23
3.0
1.6
Threshold
Hysteresis
Threshold
Hysteresis
DATA Pin is Active Low State
85
349
2.36
µA
mV
V
mV
mA
V
V
ns
µs
kHz
°C
0.4
Status Request
200
50
20
145
1. The AAT3688A output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -40°C to +85°C
temperature range is guaranteed by design.
2. Current source from TS pin, TS hot temperature fault, and TS cold temperature fault limits are specified over the -5°C to +50°C ambient
temperature range.
3688A.2006.12.1.7
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