AAT3672 Datasheet, PDF (19/27 Pages) Skyworks Solutions Inc. – 1.6A Dynamic Battery Charger and Power Manager

DATA SHEET
AAT3672
1.6A Dynamic Battery Charger and Power Manager
Charge current setting formula:
I_{CH_CC_ADP} (typ) =
V_ADP
R_SET
· KI_{I_CC_ADP}
Constant Charge
Current (mA)
100
200
300
400
500
800
1000
1600
Set Resistor Value (kΩ)
665
324
215
162
127
76.8
57.6
36.5
Table 3: R_SET Values.
For the AAT3672-3, the two enable inputs select between
four possible operating modes: two internally fixed
charging current modes (USB Low =100mA or USB high
= 500mA), an externally programmable charging cur-
rent mode, and a shutdown mode. The STAT1 function-
ality is identical for all three options.
EN1
0
0
1
1
EN2
0
1
0
1
Operating Mode
USB Low, 100mA charging current
USB High, 500mA charging current
Using R_ADP to program charging current
Shutdown mode
Table 4: AAT3672-3 Operating Modes.
Figure 4 shows the relationship of constant charging cur-
rent and set resistor values for the AAT3672.
10000
1000
Constant Current
Pre-Conditioning
100
10
1
10
100
1000
10000
R_ADP (kΩ)
Figure 4: Constant Charging Current
vs. Set Resistor Values.
Battery Connection (BAT)
A single cell Li-Ion/Polymer battery should be connected
between BAT input and ground.
Battery Charge Status Indication
Charge Status Indicator Outputs
There are three device options. All options include
recharge sequence after adapter is inserted. The AAT3672-
1 and AAT3672-2 have two status (STAT1 and STAT2)
pins and one enable pin (EN); the AAT3672-3 has one
status pin (STAT1) and two enable pins (EN1 and EN2)
Charge State
Pre-Charge
Fast-Charge
End of Charge (Charge complete)
Charge Disabled, Sleep Mode or
Fault Condition
No Battery (with Charge Enabled)
STAT1
ON
ON
OFF
STAT2
ON
OFF
ON
OFF
OFF
Flash (1Hz, Flash (1Hz,
40% duty) 40% duty)
Table 5: AAT3672-1 LED Status Indicators.
Charge State
Pre-Charge or Fast-Charge
End of Charge (Charge Complete,
Charge Disabled, or Sleep Mode)
Fault Condition
No Battery (with Charge Enabled)
STAT1
ON
OFF
OFF
Flash (1Hz,
40% duty)
STAT2
OFF
OFF
ON
OFF
Table 6: AAT3672-2 LED Status Indicators.
Charge State
Pre-Charge or Fast-Charge
End of Charge (Charge Complete, Charge
Disabled, Sleep Mode, or Fault Condition)
No Battery (with Charge Enabled)
STAT1
ON
OFF
Flash (1Hz,
40% duty)
Table 7: AAT3672-3 LED Status Indicators.
Fault condition can be one of the following:
• Battery over-voltage (OV)
• Battery temperature sense hot or cold
• Battery charge timer time-out
• Chip thermal shutdown
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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