Datasheet

July 2008 Rev 11 1/17
17
LK112Sxx
Low noise low drop voltage regulator with shutdown function
Features
Output current up to 200 mA
Low dropout voltage (500 mV max at
I
OUT
= 200 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
V
OUT
tolerance ± 2% (at 25 °C)
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 LK112Sxx 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 LK112Sxx has a very low quiescent current
in ON MODE while in OFF MODE the Iq 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
LK112SXX13 LK112SXX24 LK112SXX36 LK112SXX45
LK112SXX14 LK112SXX26 LK112SXX37 LK112SXX46
LK112SXX18 LK112SXX28 LK112SXX38 LK112SXX47
LK112SXX19 LK112SXX29 LK112SXX39 LK112SXX48
LK112SXX20 LK112SXX31 LK112SXX41 LK112SXX49
LK112SXX21 LK112SXX33 LK112SXX42 LK112SXX50
LK112SXX22 LK112SXX34 LK112SXX43
LK112SXX23 LK112SXX35 LK112SXX44
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