AAT3672 Datasheet, PDF (14/27 Pages) Skyworks Solutions Inc. – 1.6A Dynamic Battery Charger and Power Manager

DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Control Inputs
EN
ENO
ENBAT
0
0
0
1
0
0
0
1
0
1
1
0
0
0
1
1
0
1
0
1
1
1
1
1
ADP - OUT
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
Pass Devices
ADP - BAT
OFF
ON
OFF
ON
OFF
ON
OFF
ON
BAT - OUT
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Table 1: AAT3672-1 and AAT3672-2 Battery and Adapter Dynamic Path Control Table.
EN1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
Control Inputs
EN2
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
ENO
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
ENBAT
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
ADP-OUT
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
Pass Devices
ADP-BAT
OFF
ON
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
Table 2: AAT3672-3 Battery and Adapter Dynamic Path Control Table.
BAT-OUT
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
Constant Voltage Charging
The charge control system transitions to a regulated con-
stant voltage phase from the constant current fast charge
mode when the battery voltage reaches the end of charge
regulation threshold (V_CO(REG)). The regulation voltage
level is factory programmed to 4.2V (±1%). The charge
current in the constant voltage mode drops as the bat-
tery cell under charge reaches its maximum capacity.
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 (V_RCH). The charge termina-
tion current is programmed via the R_TERM resistor which
is connected between the TERM pin and ground. Use the
values listed in Table 3 to set the desired charge termi-
nation current. The programmed charge termination
current will remain at the same set level regardless of
which fast charge ADP, USBH or USBL constant current
mode is selected.
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
I_{CH_TERM} = K_{I_TERM} · _RTERM
or
2V
R_TERM = K_{I_TERM} · _{ICH_TERM}
K_{I_TERM} = 2000 (typical).
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
14
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012