AAT3672 Datasheet, PDF (17/27 Pages) Skyworks Solutions Inc. – 1.6A Dynamic Battery Charger and Power Manager

DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
control circuit. The constant current provided to charge
the timing capacitor is very small, and this pin is suscep-
tible to noise and changes in capacitance value.
Therefore, the timing capacitor should be physically
located on the printed circuit board layout as close as
possible to the CT pin. Since the accuracy of the internal
timer is dominated by the capacitance value, a 10% tol-
erance or better ceramic capacitor is recommended.
Ceramic capacitor materials, such as X7R and X5R
types, are a good choice for this application.
System Operation Flowchart
Power On
Reset
Yes
UVLO
VADP > VUVLO
No
Yes
Switch
On
No
Sleep
Mode
Thermal
Loop Enable
No
Enable
Dynamic Charge
VENBAT > VEN
Yes
Connect
ADP to BAT
and OUT
Power
Share
No
Current
Limit Test
IOUT > ILIM
Yes
Reduce
Charging
Current to BAT
No
IOUT + IBAT > ILIM?
Yes
Fault Condition
Yes
Monitor
OV, OT, OC
No
Shutdown
Mode
Battery
Yes _{Temperature Sense.} No
VTS1 < TS < VTS2
Battery
Temperature
Fault
No
Recharge Test
VRCH > VBAT?
Yes
Preconditioning
Test
VMIN > VBAT
Yes
No
Low Current
Conditioning
Charge
Device
No Temperature
Monitor
TJ > 110°C
Yes
Expire
Charge Timer
(Enable on
Charger reset)
Thermal Loop
Current Reduction
Set
Current
Phase Test
VCO(REG) > VBAT
Yes
No
Constant Current
Charging Mode
Voltage
Phase Test
IBAT > ITERM
No
Yes
Constant Voltage
Charge Mode
Charge
Complete
Voltage
Regulation
Enable
Charge
Reduction
Mode
Yes
Input Voltage
Level Test
No
VADP < VCHR_TH
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
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