Datasheet

February 2011 Doc ID 7362 Rev 16 1/17
17
LK112xx
Low noise low drop voltage regulator with shutdown function
Features
■ Output current up to 150 mA
■ Low dropout voltage (350 mV at I
OUT
= 50 mA)
■ Very low quiescent current:
– 0.1 µA in OFF mode and max. 250 µA in
ON mode at I
OUT
= 0 mA
■ Low output noise:
– typ. 30 µV at I
OUT
= 60 mA and 10 Hz < f <
80 kHz
■ Wide range of output voltages
■ Internal current and thermal limit
■ Operative input voltage from:
–V
OUT
+ 0.5 to 14 V (for V
OUT
> 2 V) or from
2.5 V to 14 V (for V
OUT
< 2 V)
Description
The LK112xx 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 µVrms. An internal
PNP pass transistor is used to achieve a low
dropout voltage. The LK112xx has a very low
quiescent current in ON MODE while in OFF
MODE the I
q
is reduced down to 100 nA max. The
internal thermal shutdown circuitry limits the
junction temperature to below 150 °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.
SOT23-5L
Table 1. Device summary
Part numbers
LK112XX15 LK112XX25 LK112XX50 LK112XX60
LK112XX18 LK112XX33 LK112XX55 LK112XX80
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