LK112S STMicroelectronics, LK112S Datasheet

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LK112S

Manufacturer Part Number
LK112S
Description
LOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION
Manufacturer
STMicroelectronics
Datasheet

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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 30 V
pass transistor is used to achieve a low dropout
voltage.
SCHEMATIC DIAGRAM
February 2003
OUTPUT CURRENT UP TO 200mA
LOW DROPOUT VOLTAGE (500mV MAX AT
I
VERY LOW QUIESCENT CURRENT: 0.1 A
IN OFF MODE AND MAX 250 A IN ON
MODE AT I
LOW OUTPUT NOISE: TYP 30 V AT
I
WIDE RANGE OF OUTPUT VOLTAGES
INTERNAL CURRENT AND THERMAL LIMIT
V
OUT
OUT
OUT
=200mA)
=60mA AND 10Hz<f<80KHz
TOLERANCE
OUT
=0mA
LOW NOISE LOW DROP VOLTAGE REGULATOR
2% (AT 25°C)
rms
. An internal PNP
WITH SHUTDOWN FUNCTION
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.
SOT23-5L
LK112S
SERIES
1/11

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LK112S Summary of contents

Page 1

... TOLERANCE 2% (AT 25°C) OUT 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 ...

Page 2

... LK112S SERIES ABSOLUTE MAXIMUM RATINGS Symbol V DC Input Voltage I V Shutdown Input Voltage SHDN I Output Current O T Storage Temperature Range stg T Operating Junction Temperature Range op CONNECTION DIAGRAM (top view) SOT23-5L ELECTRICAL CHARACTERISTICS FOR LK112 (T V =1.8V 2 SHDN I O Symbol ...

Page 3

... LK112SM30TR 3.0V LK112SM31TR (*) 3.1V LK112SM32TR 3.2V LK112SM33TR 3.3V LK112SM34TR (*) 3.4V LK112SM35TR (*) 3.5V LK112SM36TR 3.6V LK112SM37TR (*) 3.7V LK112SM38TR 3.8V LK112SM39TR (*) 3.9V LK112SM40TR 4.0V LK112SM41TR (*) 4.1V LK112SM42TR (*) 4.2V LK112SM43TR (*) 4.3V LK112SM44TR (*) 4.4V LK112SM45TR (*) 4.5V LK112SM46TR (*) 4.6V LK112SM47TR 4.7V LK112SM48TR (*) 4.8V LK112SM49TR (*) 4.9V LK112SM50TR 5.0V LK112SM55TR (*) 5.5V LK112M60TR 6.0V LK112SM80TR 8.0V (*) Available on request V Min V Max OUT OUT 1.24V 1.36V 1.34V 1.46V 1.44V 1.56V 1.54V 1.66V 1.64V 1.76V 1.74V 1 ...

Page 4

... LK112S SERIES TYPICAL CHARACTERISTICS (unless otherwise specified T Figure 1 : Output Voltage vs Temperature Figure 2 : Output Voltage vs Temperature Figure 3 : Line Regulation vs Temperature 4/11 = 25° =2 Figure 4 : Load Regulation vs Temperature Figure 5 : Dropout Voltage vs Temperature Figure 6 : Short Circuit Currennt vs Dropout Voltage =100nF) BYP ...

Page 5

... 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 5/11 ...

Page 6

... LK112S SERIES Figure 13 : Supply Voltage Rejection vs Temperature Figure 14 : Quiescent Current vs Temperature Figure 15 : Quiescent Current vs Input Voltage 6/11 Figure 16 : Quiescent Current vs Shutdown Voltage Figure 17 : Quiescent Current vs Output Current Figure 18 : Reverse Current vs Reverse Voltage ...

Page 7

... Figure 22 : Start-up Transient V =3.5V =100nF BY Figure 23 : Line Transient V =3.5 to 4.5V =100nF Figure 24 : Line Transient =2. =3.5 to 4.5V =10nF LK112S SERIES =2.5V 1.8V SHDN L I =2.5V, V =1.8V, I =30mA SHDN =2.5V, V =1.8V, I =30mA SHDN O ...

Page 8

... LK112S SERIES Figure 25 : Line Transient V =3.5 to 4.5V, V =2.5V, V =1.8V SHDN C =1nF Figure 26 : Load Transient V =3 =2.5V, V =1.8V, I =50 to 100mA SHDN =10nF =250ns 8/11 Figure 27 : Load Transient =30mA =3.5V = Figure 28 : Load Transient ...

Page 9

... SOT23-5L MECHANICAL DATA mm. DIM. MIN. A 0.90 A1 0.00 A2 0.90 b 0.35 C 0.09 D 2.80 E 2. 0.35 TYP MAX. MIN. 1.45 35.4 0.15 1.30 35.4 0.50 13.7 0.20 3.00 110.2 3.00 102.3 1.75 .95 1.9 0.55 13.7 LK112S SERIES mils TYP. MAX. 57.1 0.0 51.2 19.7 3.5 118.1 118.1 59.0 68.8 37.4 74.8 21.6 5.9 7.8 9/11 ...

Page 10

... LK112S SERIES Tape & Reel SOT23-xL MECHANICAL DATA DIM. MIN 12 3.13 Bo 3.07 Ko 1.27 Po 3.9 P 3.9 10/11 mm. TYP MAX. MIN. 180 13.0 13.2 0.504 0.795 2.362 14.4 3.23 3.33 0.123 3.17 3.27 0.120 1.37 1.47 0.050 4.0 4.1 0.153 4.0 4.1 0.153 inch TYP. MAX. 7.086 0.512 0.519 0.567 0.127 0.131 0.124 0.128 0.054 0.0.58 0.157 ...

Page 11

... STMicroelectronics - Printed in Italy - All Rights Reserved Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. STMicroelectronics GROUP OF COMPANIES © http://www.st.com LK112S SERIES 11/11 ...

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