AAT3698 Datasheet, PDF (14/21 Pages) Skyworks Solutions Inc. – 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Power Status
V_IN < V_UVLO
V_IN > V_OVP
V_IN < V_BAT + V_{IN_BAT_OS}, EN = low
V_UVLO ≤ V_BAT + V_{IN_BAT_OS} ≤ V_IN ≤ V_OVP
Table 2: POK Flag Indicator.
POK
High
High
High
Low
Automatic Booting
An auxiliary OR gate provides a booting enable signal
from two inputs, an internal power OK signal and an
external ABI signal. The ABO states are listed in Table 3.
V_BAT
Yes
Yes
Yes
No
POK
Low
High
High
X
ABI
X
High
Low
X
ABO
High
High
Low
Low
Table 3: Automatic Booting.
Battery Detection
When the NOBAT pin is set to logic high level, the char-
ger is disabled. When it is set to logic low level, the
charger is enabled. This pin is internally pulled to the
LDOOUT pin through a 1.6MΩ resistor.
Battery Over-Voltage Protection
An over-voltage event is defined as a condition where
the voltage at the BAT pin exceeds the maximum battery
charge voltage and is set by the battery over-voltage
protection threshold (V_BOVP). If an over-voltage condition
is sensed by the BATS pin, the AAT3698-1/-2 charge
control shuts down the device until the voltage at the
BAT pin drops below V_BOVP. The AAT3698-1/-2 resumes
normal charging operation after the over-voltage condi-
tion is removed.
Digital Thermal Loop Control
The AAT3698-1/-2 includes a thermal management sys-
tem. The system is activated when the die temperature
reaches its preset internal temperature threshold (110°C)
and maintains the die temperature by reducing the con-
stant charge current.
Over-Temperature Shutdown
The AAT3698-1/-2 has a thermal protection control cir-
cuit which shuts down charging functions if the internal
die temperature exceeds the preset thermal limit thresh-
old (140°C). Once the internal die temperature falls
below the thermal limit, normal operation resumes in the
previous charging state.
Linear Dropout Regulator
The AAT3698-1/-2's linear dropout regulator output
(LDOOUT) provides 5V output with 30mA typical load
current capabilities.
IC Input
The AAT3698-1/-2 has an IC input pin that is internally
connected to ground through a 100kΩ resistor. Float or
ground this pin for normal operation.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012