LP38842-ADJ_15 Datasheet, PDF (8/15 Pages) Texas Instruments – 1.5A Ultra Low Dropout Adjustable Linear Regulators Stable with Ceramic Output Capacitors

LP38842-ADJ
SNVS304A – FEBRUARY 2005 – REVISED APRIL 2013
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UNDER VOLTAGE LOCKOUT
The bias voltage is monitored by a circuit which prevents the regulator output from turning on if the bias voltage
is below approximately 3.8V.
SHUTDOWN OPERATION
Pulling down the shutdown (S/D) pin will turn-off the regulator. The S/D pin must be actively terminated through a
pull-up resistor (10 kΩ to 100 kΩ) for a proper operation. If this pin is driven from a source that actively pulls high
and low (such as a CMOS rail to rail comparator), the pull-up resistor is not required. This pin must be tied to Vin
if not used.
POWER DISSIPATION/HEATSINKING
Heatsinking for the SO PowerPAD-8 package is accomplished by allowing heat to flow through the ground slug
on the bottom of the package into the copper on the PC board. The heat slug must be soldered down to a
copper plane to get good heat transfer. It can also be connected through vias to internal copper planes. Since
the heat slug is at ground potential, traces must not be routed under it which are not at ground potential. Under
all possible conditions, the junction temperature must be within the range specified under operating conditions.
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