LK112 STMicroelectronics, LK112 Datasheet

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LK112

Manufacturer Part Number
LK112
Description
LOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION
Manufacturer
STMicroelectronics
Datasheet

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DESCRIPTION
The LK112 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
June 2003
OUTPUT CURRENT UP TO 150mA
LOW DROPOUT VOLTAGE (350mV 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 VOLTGAES
INTERNAL CURRENT AND THERMAL LIMIT
OUT
OUT
=150mA)
=60mA AND 10Hz<f<80KHz
OUT
=0mA
LOW NOISE LOW DROP VOLTAGE REGULATOR
rms
. An internal PNP
WITH SHUTDOWN FUNCTION
The LK112 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
SERIES
LK112
1/12

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LK112 Summary of contents

Page 1

... OUT WIDE RANGE OF OUTPUT VOLTGAES INTERNAL CURRENT AND THERMAL LIMIT DESCRIPTION The LK112 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

... LK112 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 THERMAL DATA Symbol Parameter R Thermal Resistance Junction-case thj-case R Thermal Resistance Junction-ambient thj-amb CONNECTION DIAGRAM (top view) ...

Page 3

... ELECTRICAL CHARACTERISTICS FOR LK112 (T V =1.8V 2 SHDN I O Symbol Parameter I Quiescent Current d V Output Voltage O V Line Regulation O V Load Regulation O V Dropout Voltage d I Output Current Limit O SVR Supply Voltage Rejection eN Output Noise Voltage I Shutdown Input Current SHDN ...

Page 4

... LK112M29TR (*) 2.9V LK112M30TR 3.0V LK112M31TR (*) 3.1V LK112M32TR 3.2V LK112M33TR 3.3V LK112M34TR (*) 3.4V LK112M35TR (*) 3.5V LK112M36TR 3.6V LK112M37TR (*) 3.7V LK112M38TR 3.8V LK112M39TR (*) 3.9V LK112M40TR 4.0V LK112M41TR (*) 4.1V LK112M42TR (*) 4.2V LK112M43TR (*) 4.3V LK112M44TR (*) 4.4V LK112M45TR (*) 4.5V LK112M46TR (*) 4.6V LK112M47TR 4.7V LK112M48TR (*) 4.8V LK112M49TR (*) 4.9V LK112M50TR 5.0V LK112M55TR (*) 5.5V LK112M60TR 6.0V LK112M80TR 8.0V (*) Available on request 4/12 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 ...

Page 5

... TYPICAL CHARACTERISTICS (unless otherwise specified T Figure 1 : Output Voltage vs Temperature Figure 2 : Output Voltage vs Temperature Figure 3 : Line Regulation vs Temperature = 25° =2 Figure 4 : Load Regulation vs Temperature Figure 5 : Dropout Voltage vs Temperature Figure 6 : Short Circuit Currennt vs Dropout Voltage LK112 SERIES =100nF) BYP 5/12 ...

Page 6

... LK112 SERIES Figure 7 : Output Voltage vs Input Voltage Figure 8 : Shutdown Voltage vs Temperature Figure 9 : Shutdown Current vs Shutdown Voltage 6/12 Figure 10 : Supply Voltage Rejection vs Temperature Figure 11 : Supply Voltage Rejection vs Output Current Figure 12 : Supply Voltage Rejection vs Frequency ...

Page 7

... 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 LK112 SERIES 7/12 ...

Page 8

... LK112 SERIES Figure 19 : Stability Figure 20 : Spectrum Noise Figure 21 : Start-up Transient V =3.5V, V =2.5V 1.8V SHDN C =4 =10nF O BY 8/12 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 ...

Page 9

... Figure 27 : Load Transient =30mA =3.5V = Figure 28 : Load Transient = =4 =2 LK112 SERIES =2.5V, V =1.8V, I =50 to 100mA SHDN O =100nF =250ns =3.8V, V =1.8V, I =50 to 100mA SHDN O =10nF =250ns ...

Page 10

... LK112 SERIES DIM. MIN. A 0.90 A1 0.00 A2 0.90 b 0.35 C 0.09 D 2. 2.60 L 0.10 10/12 SOT23-5L MECHANICAL DATA mm. TYP MAX. 1.45 0.10 1.30 0.50 0.20 3.00 1.75 0.95 3.00 0.60 . mils MIN. TYP. 35.4 0.0 35.4 13.7 3.5 110.2 59.0 37.4 102.3 3.9 7049676C MAX. 57.1 3.9 51.2 19.7 7.8 118.1 68.8 118.1 23.6 ...

Page 11

... Tape & Reel SOT23-xL MECHANICAL DATA mm. DIM. MIN 12 3.13 Bo 3.07 Ko 1.27 Po 3.9 P 3.9 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 LK112 SERIES 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 0.161 0.157 0.161 11/12 ...

Page 12

... LK112 SERIES Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...

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