Datasheet

LM3463
SNVS807A –MAY 2012–REVISED MAY 2013 www.ti.com
Generally, the system startup time t
ST
is the longest when the ISR pin is left open (t
ST-1
). The amount of the
decreasing of the startup time is inversely proportional to the current being drawn from the ISR pin, thus
determined by the value of the resistor, R
ISR
. The rate of decreasing of the startup time is governed by the
following equation.
(8)
The practical startup time varies according to the settings of the V
DHC_READY
, V
FB
, C
DHC
and R
ISR
with respect to
the following equations.
(9)
where
(10)
Sinking higher than 100 µA from the ISR pin could damage the device. The value of the R
ISR
should be no lower
than 13 kΩ to prevent potential damages.
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