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LK112SM15TRSTN/a2500avaiLOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION
LK112SM18TRSTN/a3000avaiLOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION
LK112SM25TRSTN/a3000avaiLOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION
LK112SM28TRSTN/a811avaiLOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION
LK112SM30TRSTMN/a20avaiLOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION
LK112SM33TRSTMN/a20avaiLOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION
LK112SM50TRSTMICN/a36000avaiLOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION


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LK112SM15TR-LK112SM18TR-LK112SM25TR-LK112SM28TR-LK112SM30TR-LK112SM33TR-LK112SM50TR
LOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION
1/11February 2003 OUTPUT CURRENT UP TO 200mA LOW DROPOUT VOLTAGE (500mV MAX AT
IOUT=200mA) VERY LOW QUIESCENT CURRENT: 0.1μA
IN OFF MODE AND MAX 250μA IN ON
MODE AT IOUT=0mA LOW OUTPUT NOISE: TYP 30μV AT
IOUT=60mA AND 10Hz
DESCRIPTION
The LK112S 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 30μVrms. An internal PNP
pass transistor is used to achieve a low dropout
voltage.
The LK112S 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°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.
LK112S
SERIES

LOW NOISE LOW DROP VOLTAGE REGULATOR
WITH SHUTDOWN FUNCTION
SCHEMATIC DIAGRAM
LK112S SERIES
2/11
ABSOLUTE MAXIMUM RATINGS
CONNECTION DIAGRAM (top view) PIN DESCRIPTION
ELECTRICAL CHARACTERISTICS FOR LK112 (Tj = 25°C, VIN=VOUT+1V (see Note 1), IOUT=0mA,
SHDN =1.8V, CI = 1 μF, CO = 2.2μF, C BYPASS = 0.1μF unless otherwise specified)
Note 1: for version with output voltage less than 2V VIN=2.4V
Note 2: only for version with output voltage more than 2.1V
LK112S SERIES
3/11
ORDERING NUMBERS AND OUTPUT VOLTAGE

(*) Available on request
LK112S SERIES
4/11
TYPICAL CHARACTERISTICS (unless otherwise specified T
j = 25°C, CI =1μF, CO =2.2μF, C BYP =100nF)
Figure 1 : Output Voltage vs Temperature


Figure 2 : Output Voltage vs Temperature


Figure 3 : Line Regulation vs Temperature


Figure 4 : Load Regulation vs Temperature


Figure 5 : Dropout Voltage vs Temperature


Figure 6 : Short Circuit Currennt vs Dropout

Voltage
LK112S SERIES
5/11
Figure 7 : Output Voltage vs Input Voltage


Figure 8 : Shutdown Voltage vs Temperature


Figure 9 : Shutdown Current vs Shutdown

Voltage
Figure 10 : Supply Voltage Rejection vs

Temperature
Figure 11 : Supply Voltage Rejection vs Output

Current
Figure 12 : Supply Voltage Rejection vs

Frequency
LK112S SERIES
6/11
Figure 13 : Supply Voltage Rejection vs

Temperature
Figure 14 : Quiescent Current vs Temperature


Figure 15 : Quiescent Current vs Input Voltage


Figure 16 : Quiescent Current vs Shutdown

Voltage
Figure 17 : Quiescent Current vs Output Current


Figure 18 : Reverse Current vs Reverse Voltage


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