DATA SHEET
AAT3673
1.6A Dynamic Battery Charger and Power Manager
Pin Descriptions
Pin # Name Type Function
Connect a resistor from this pin to GND to set the ADP fast charge constant current. The programmed
constant current level should be less than the ADP current limit set by ADPLIM specification (ILIM_ADP).
Adapter input, source of system load and battery charging. Connect a 1μF (minimum) ceramic ca-
pacitor as close as possible between ADP and GND.
Input for the over-voltage protection bypass node. Connect a 1μF (minimum) ceramic capacitor be-
tween this pin and GND.
1
2
3
ADPSET
ADP
I
I
I
BYP
This open-drain MOSFET device is for charger status reporting. If used for status indication display,
connect an LED Cathode to this node with a series ballast resistor. Connect the LED anode to OUT or
BYP.
AAT3673-1/-2/-4/-5: This open-drain MOSFET device is for charger status reporting. If used for sta-
tus indication display, connect an LED cathode to this node with a series ballast resistor. Connect the
LED anode to OUT or BYP.
AAT3673-3/-6: The EN2 pin (internal pull-up) is used together with the EN1 pin; see Table 2 in the
"Functional Description" section of this datasheet.
4
STAT1
STAT2
O
O
5
6
7
EN2
I
GND
I/O
Common ground connection.
AAT3673-1/-2/-4/-5: Input enable (internal pull-up). Low to enable the ADP switch and battery
charging path; high to disable the ADP switch and battery charging function. See Table 1 in the
"Functional Description" section of this datasheet.
EN
I
AAT3673-3/-6: The EN1 pin (internal pull-up) is used together with the EN2 pin; see Table 2 in the
"Functional Description" section of this datasheet.
Enable Input power to OUT, the dynamic power path from the ADP input to the system load. Active
low input (internal pull-up).
EN1
ENO
I
I
8
9
Battery load switch enable, active low. Battery load switch control the power path between the bat-
tery cell and OUT (internal pull-up).
Battery pack (+) connection. For best operation, a 1μF (minimum) ceramic capacitor should be
ENBAT
BAT
I
10, 11
I/O
placed as close as possible between BAT and GND.
Adaptor mode charge reduction voltage threshold programming pin. The ADP charge reduction
threshold may be adjusted from the default value by placing a voltage divider between this pin to
VADP and GND to this pin.
Connect a resistor between this pin and GND to program the charge termination current threshold.
The charge termination current level can be disabled by connecting this pin to BYP.
12
13
CHRADP
TERM
I
I
Battery temperature sensing input. For typical applications, connect a 10kΩ resistor from BYP to this
pin and a 10kΩ NTC thermistor located inside the battery pack under charge to this pin and GND to
sense battery over temperature conditions during the charge cycle. To disable the TS function, con-
nect this pin to GND.
System dynamic power output supplied from the ADP input, BAT or both. Connect a 10μF ceramic
capacitor between this pin and GND.
14
15
TS
I
OUT
O
Battery charge timer input pin, connect a capacitor on this pin to set the ADP charge timers. Typi-
cally, a 0.1μF ceramic capacitor is connected between this pin and GND. To disable the timer circuit
function, connect this pin directly to GND.
16
EP
CT
EP
I
I/O
Exposed paddle (package bottom). Connect to GND plane under the device.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2
201881B
• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
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