EUP7182
Fault Detection
The EUP7182 provides a
FAULT
pin that goes low
during out of regulation conditions like current limit and
thermal shutdown, or when it approaches dropout. The
latter monitors the input-to-output voltage differential
and compares it against a threshold that is slightly above
the dropout voltage. This threshold also tracks the
dropout voltage as it varies with load current. Refer to
Fault Detect vs. Load Current curve in the typical
characteristics section.
The
FAULT
pin requires a pull-up resistor since it is an
open-drain output. This resistor should be large in value
to reduce energy drain. A100kΩ pull-up resistor works
well for most applications.
Shutdown
The EUP7182 goes into sleep mode when the
SHDN
pin
is in a logic low condition. During this condition, the
pass transistor, error amplifier, and bandgap are turned
off, reducing the supply current to 60nA typical. The
SHDN
pin may be directly tied to V
IN
to keep the part
on.
Fast Start-up
The EUP7182 provides fast start-up time for better
system efficiency. The start-up speed is maintained when
using the optional noise bypass capacitor.
DS7182 Ver 1.0 Oct.2007
6