LK112
SERIES
LOW NOISE LOW DROP VOLTAGE REGULATOR
WITH SHUTDOWN FUNCTION
s
s
s
s
s
s
OUTPUT CURRENT UP TO 150mA
LOW DROPOUT VOLTAGE (350mV AT
I
OUT
=150mA)
VERY LOW QUIESCENT CURRENT: 0.1碌A(chǔ)
IN OFF MODE AND MAX 250碌A(chǔ) IN ON
MODE AT I
OUT
=0mA
LOW OUTPUT NOISE: TYP 30碌V AT
I
OUT
=60mA AND 10Hz<f<80KHz
WIDE RANGE OF OUTPUT VOLTGAES
INTERNAL CURRENT AND THERMAL LIMIT
SOT23-5L
DESCRIPTION
The LK112 is a low dropout linear regulator with a
built in electronic switch. The internal switch can
be controlled by TTL or CMOS logic levels. The
device is ON state when the control pin is pulled to
a logic high level. An external capacitor can be
used connected to the noise bypass pin to lower
the output noise level to 30碌V
rms
. An internal PNP
pass transistor is used to achieve a low dropout
voltage.
The LK112 has a very low quiescent current in ON
MODE while in OFF MODE the Iq is reduced
down to 100nA max. The internal thermal
shutdown circuitry limits the juntion temperature to
below 150擄C. The load current is internally
monitored and the device will shutdown in the
presence of a short circuit or overcurrent condition
at the output.
SCHEMATIC DIAGRAM
June 2003
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