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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 Tj = 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
