AAT3783 Datasheet, PDF (12/20 Pages) Advanced Analogic Technologies – 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection

PRODUCT DATASHEET
AAT3783
BatteryManager^TM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
Over-Current Protection
The AAT3783 over-current protection provides fault-
condition protection that limits the charge current to
approximately 1.6A under all conditions, even if the ISET
pin gets shorted to ground.
FLT Blanking Time
The FLT output is an active-low open-drain fault (OV)
reporting output. A pull-up resistor should be connected
from FLT to the logic I/O voltage of the host system. FLT
will be asserted immediately an over-voltage fault occurs
(only about a 1μs inherited internal circuit delay). A
10ms blanking is applied to the FLT signal prior to de-
assertion.
Enable / Disable
The AAT3783 provides an enable function to control the
OVP stage and charger on and off independently.
ENOVP is an active-low enable input. ENOVP is driven
low, connected to ground, or left floating for normal
device operation. Taking ENOVP high turns off the
MOSFET of the OVP stage. In the case of an over-voltage
or UVLO condition, toggling ENOVP will not override the
fault condition and the switch will remain off.
OVP Turn-On Delay Time
On initial power-up, if V_IN < UVLO or if V_OVP > 6.5V the
PMOS is held off. If UVLO < V_IN, V_OVP < 6.5V, and ENOVP
is low, the device enters startup after a 10ms internal
delay.
12
www.analogictech.com
3783.2007.12.1.0