AAT3672 Datasheet, PDF (15/27 Pages) Skyworks Solutions Inc. – 1.6A Dynamic Battery Charger and Power Manager

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
V_{CO( REG)}
V_RCH
I _{CH_CC}
Termination
Phase
Recharge Phase
I _{CH_ CC}
Termination
Phase
V_MIN
V_UVLO
I_{CH_ TKL}
I_{CH_ TERM}
when
V_BAT =
V_{CO( REG)}
I_{CH_ TERM}
when
V_BAT =
V_{CO( REG)}
Figure 1: Current vs. Voltage and Charger Time Profile.
I_TERM (mA)
320
174
125
95
77
64
58
50
49
42
37
R_TERM (kΩ)
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 sup-
ply 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 sup-
ply 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 con-
trolled. 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 cur-
rent is set by the R_SET resistor (fast charge current set-
ting, I_{CH_CC}) and is split between the system load (I_BAT-
OUT^{) and the battery charge current (I}BAT^{). The charge}
current is dynamically adjusted as the system load
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
15