AAT3693 Advanced Analogic Technologies, Inc., AAT3693 Datasheet - Page 14

• Manufacturer Part Number: AAT3693
• Description: 1.6a Lithium-ion/polymer Battery Charger In 2.2x2.2 Tdfn
• Manufacturer: Advanced Analogic Technologies, Inc.

The charge termination current I
grammed by connecting a resistor from TERM to GND.
Use the values listed in Table 2 to set the desired charge
termination current.
Note: Low = LED ON; High = LED OFF
14
BatteryManager
Figure 3: Charge Termination Current vs. R
No Battery (with Charge Enabled)
50%
40%
30%
20%
10%
Table 3: LED Status Indicator (STATx Pulled Up to a Voltage Source with Resistors and LED).
Table 2: Charge Termination Current
0%
R
Event Description
0
TERM
Charge Complete
Battery Charging
Programming Resistor Values.
Fault Condition
6.65
13.3
26.7
40.2
53.6
(KΩ)
10
TM
20
R
TERM
30
(kΩ Ω )
CH_TERM
I
40
CH_TERM
1.6A Lithium-Ion/Polymer Battery Charger in 2.2x2.2 TDFN
10%
20%
30%
40%
5%
All Options
can be pro-
50
(%)
STAT1
Flash
High
High
Low
w w w . a n a l o g i c t e c h . c o m
TERM
60
.
Options AA, AB, AE, AF,
If the desired end of charge termination current level is
not listed in Table 2, the TERM resistor value may be
calculated by the following equation:
When the charge current drops to the programmed
charge termination current level in the constant voltage
mode, the device terminates charging and goes into a
sleep state. The charger will remain in this sleep state
until the battery voltage decreases to a level below the
battery recharge voltage threshold (V
In such cases where the AAT3693 input voltage drops,
the device will enter sleep state and automatically
resume charging once the input supply has recovered
from the fault condition. Consuming very low current in
sleep state, the AAT3693 minimizes battery drain when
it is not charging. This feature is particularly useful in
applications where the input supply level may fall below
the battery charge or under-voltage lockout level.
Charge Status Outputs
The AAT3693 provides battery charge status via two
status pins. These pins are internally connected to an
N-channel open-drain MOSFET, which can be used drive
external LEDs. The status pins can indicate the following
conditions.
AI, AJ, BM and BN
STAT2 Type 1
Flash
High
High
Low
I
CH_TERM
PRODUCT DATASHEET
=
15μA · R
Options AC, AD, AG, AH,
2V
AAT3693
AK, AL, BO and BP
TERM
STAT2 Type 2
· I
RCH
Flash
CC
High
High
Low
).
3693.2009.04.1.1