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LK112SM31TR 반도체 회로 부품 판매점

LOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION



STMicroelectronics 로고
STMicroelectronics
LK112SM31TR 데이터시트, 핀배열, 회로
LK112S
SERIES
LOW NOISE LOW DROP VOLTAGE REGULATOR
WITH SHUTDOWN FUNCTION
s OUTPUT CURRENT UP TO 200mA
s LOW DROPOUT VOLTAGE (500mV MAX AT
IOUT=200mA)
s VERY LOW QUIESCENT CURRENT: 0.1µA
IN OFF MODE AND MAX 250µA IN ON
MODE AT IOUT=0mA
s LOW OUTPUT NOISE: TYP 30µV AT
IOUT=60mA AND 10Hz<f<80KHz
s WIDE RANGE OF OUTPUT VOLTAGES
s INTERNAL CURRENT AND THERMAL LIMIT
s VOUT TOLERANCE ± 2% (AT 25°C)
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.
SOT23-5L
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.
SCHEMATIC DIAGRAM
February 2003
1/11


LK112SM31TR 데이터시트, 핀배열, 회로
LK112S SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol
VI
VSHDN
IO
Tstg
Top
Parameter²
DC Input Voltage
Shutdown Input Voltage
Output Current
Storage Temperature Range
Operating Junction Temperature Range
Value
16
16
Internally limited
-55 to +150
-30 to +80
Unit
V
V
°C
°C
CONNECTION DIAGRAM (top view)
SOT23-5L
PIN DESCRIPTION
Pin N° Symbol
Name and Function
1 SHDN Shutdown Input: Disables the
regulator when is connected to GND
or to positive voltage less than 0.6V
2 GND Ground Pin: Internally connected to
the die attach flag to decrease the
total thermal resistance and increase
the package ability to dissipate
power.
3 Bypass Bypass Pin: Bypass with 0.1µF to
improve the Vref thermal noise
performances.
4 OUT Output Port
5 IN Input Port
ELECTRICAL CHARACTERISTICS FOR LK112 (Tj = 25°C, VIN=VOUT+1V (see Note 1), IOUT=0mA,
VSHDN=1.8V, CI = 1 µF, CO = 2.2µF, CBYPASS = 0.1µF unless otherwise specified)
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
Id Quiescent Current
VO Output Voltage
VO Line Regulation
VO Load Regulation
Vd Dropout Voltage
ISC Short Circuit Current
SVR Supply Voltage Rejection
eN Output Noise Voltage
ISHDN Shutdown Input Current
VSHDN Shutdown Input Logic
VO/Tj Output Voltage
Temperature Coefficient
ON MODE (except ISHDN)
OFF MODE VI = 8V
VSHDN = 0V
IO = 30mA
VI = VO+1V to VO+6V,
VO 5.6V
VI = VO+1V to VO+6V,
VO > 5.6V
IO = 1 to 60mA
IO = 1 to 200mA
IO = 60 mA (see Note 2)
IO = 200 mA (see Note 2)
VI = VO+1.5V
CBYP = 0.1µF
CO = 10µF f = 400Hz IO = 30mA
B= 10Hz to 80KHz CBYP = 0.1µF
CO = 10µF VI = VO+1.5V,IO = 60mA
VSHDN = 1.8V
Output ON
Output ON
Output OFF
IO = 10mA
175 250
0 0.1
(see table)
0.7 20
0.8 40
15 30
30 90
0.17 0.24
0.35 0.5
200
55
µA
µA
mV
mV
mV
mV
V
V
mA
dB
30 µVrms
12 35 µA
1.8 V
0.6 V
0.09 mV/°C
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
2/11




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LK112SM31TR regulator

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LK112SM31TR

LOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION - STMicroelectronics