SGS Thomson Microelectronics LK112SM37TR, LK112SM36TR, LK112SM33TR, LK112SM32TR, LK112SM31TR Datasheet
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LK112S
SERIES
LOW NOISE LOW DROP VOLTAGE REGULATOR
WITH SH UTDOWN FUNCTI ON
■ OUTPUT CURRENT UP TO 200mA
■ LOW DROPOUT VOLTAGE (500mV MAX AT
I
=200mA)
OUT
■ VERY LOW QUIESCENT CURRENT: 0.1µA
IN OFF MODE AND MAX 250µA IN ON
MODE AT I
■ LOW OUTPUT NOISE: TYP 30µV AT
I
=60mA AND 10Hz<f<80KHz
OUT
■ WIDE RANGE OF OUTPUT VOLTAGES
■ INTERNAL CURRENT AND THERMAL LIMIT
■ V
TOLERANCE ± 2% (AT 25°C)
OUT
OUT
=0mA
DESCRIPTION
The LK112S is a low d ropout li near regul ator 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 30µV
. An internal PNP
rms
pass transistor is used t o 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
1/11February 2003
LK112S SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter² Value Unit
V
V
SHDN
I
T
T
CONNECTION DIAGRAM (top view) PIN DESCRIPTION
DC Input Voltage
I
Shutdown Input Voltage
Output Current
O
Storage Temperature Range
stg
Operating Junction Temperature Range
op
SOT23-5L
16 V
16 V
Internally limited
-55 to +150 °C
-30 to +80 °C
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 OU T Output Port
5 IN Input Port
ELECTRICAL CHARACTERISTICS FOR LK112 (T
V
=1.8V, CI = 1 µF, CO = 2.2µ F, C
SHDN
BYPASS
= 0.1µF unless otherwise specified)
= 25°C, VIN=V
j
+1V (see Note 1), I
OUT
OUT
=0mA,
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
Quiescent Current ON MODE (except I
d
OFF MODE V
Output Voltage IO = 30mA (see table)
V
O
∆V
∆V
SVR Supply Voltage Rejection V
Line Regulation VI = VO+1V to VO+6V, VO ≤ 5.6V 0.7 20 mV
O
= VO+1V to VO+6V, VO > 5.6V 0.8 40 mV
V
I
Load Regulation IO = 1 to 60mA 15 30 mV
O
= 1 to 200mA 30 90 mV
I
O
V
Dropout Voltage IO = 60 mA (see Note 2) 0.17 0.24 V
d
= 200 mA (see Note 2) 0.35 0.5 V
I
O
Short Circuit Current 200 mA
I
SC
= VO+1.5V C
I
C
= 10µF f = 400Hz IO = 30mA
O
eN Output Noise Voltage B= 10Hz to 80KHz C
C
= 10µFVI = VO+1.5V,IO = 60mA
O
I
SHDN
V
∆V
Note 1: fo r version wi th output vol tage less than 2V VIN=2.4V
Note 2: only for version with output voltage more than 2.1V
Shutdown Input Current V
Shutdown Input Logic Output ON
SHDN
Output Voltage
O/Tj
Temperature Coefficient
= 1.8V Output ON 12 35 µA
SHDN
Output OFF
IO = 10mA 0.09 mV/°C
= 8V V
I
) 175 250 µA
SHDN
= 0V 0 0.1 µA
SHDN
BYP
BYP
= 0.1µF
= 0.1µF
55 dB
30 µVrms
1.8
0.6
V
V
2/11
ORDERING NUMBERS AND OUTPUT VOLTAGE
LK112S SERIES
Part Number Output Voltage
Min V
V
OUT
OUT
Max
Test Voltage
LK112SM13TR 1.3V 1.24V 1.36V 2.4V
LK112SM14TR (*) 1.4V 1.34V 1.46V 2.4V
LK112SM15TR 1.5V 1.44V 1.56V 2.4V
LK112SM16TR 1.6V 1.54V 1.66V 2.4V
LK112SM17TR (*) 1.7V 1.64V 1.76V 2.4V
LK112SM18TR 1.8V 1.74V 1.86V 2.4V
LK112SM19TR (*) 1.9V 1.84V 1.96V 2.4V
LK112SM20TR (*) 2.0V 1.94V 2.06V 3.0V
LK112SM21TR 2.1V 2.04V 2.16V 3.1V
LK112SM22TR (*) 2.2V 2.14V 2.26V 3.2V
LK112SM23TR (*) 2.3V 2.24V 2.36V 3.3V
LK112SM24TR (*) 2.4V 2.34V 2.46V 3.4V
LK112SM25TR 2.5V 2.44V 2.56V 3.5V
LK112SM26TR (*) 2.6V 2.54V 2.66V 3.6V
LK112SM27TR (*) 2.7V 2.64V 2.76V 3.7V
LK112SM28TR 2.8V 2.74V 2.86V 3.8V
LK112SM29TR (*) 2.9V 2.84V 2.96V 3.9V
LK112SM30TR 3.0V 2.94V 3.06V 4.0V
LK112SM31TR (*) 3.1V 3.04V 3.16V 4.1V
LK112SM32TR 3.2V 3.14V 3.26V 4.2V
LK112SM33TR 3.3V 3.24V 3.36V 4.3V
LK112SM34TR (*) 3.4V 3.335V 3.465V 4.4V
LK112SM35TR (*) 3.5V 3.435V 3.565V 4.5V
LK112SM36TR 3.6V 3.535V 3.655V 4.6V
LK112SM37TR (*) 3.7V 3.630V 3.770V 4.7V
LK112SM38TR 3.8V 3.725V 3.875V 4.8V
LK112SM39TR (*) 3.9V 3.825V 3.975V 4.9V
LK112SM40TR 4.0V 3.920V 4.080V 5.0V
LK112SM41TR (*) 4.1V 4.020V 4.180V 5.1V
LK112SM42TR (*) 4.2V 4.120V 4.280V 5.2V
LK112SM43TR (*) 4.3V 4.215V 4.385V 5.3V
LK112SM44TR (*) 4.4V 4.315V 4.485V 5.4V
LK112SM45TR (*) 4.5V 4.410V 4.590V 5.5V
LK112SM46TR (*) 4.6V 4.510V 4.690V 5.6V
LK112SM47TR 4.7V 4.605V 4.795V 5.7V
LK112SM48TR (*) 4.8V 4.705V 4.895V 5.8V
LK112SM49TR (*) 4.9V 4.800V 5.000V 5.9V
LK112SM50TR 5.0V 4.900V 5.100V 6.0V
LK112SM55TR (*) 5.5V 5.390V 5.610V 6.5V
LK112M60TR 6.0V 5.880V 6.120V 7.0V
LK112SM80TR 8.0V 7.840V 8.160V 9.0V
(*) Avai l abl e on reque st
3/11
LK112S SERIES
TYPICAL CHARACTERISTICS (unless otherwise specified Tj = 25°C, CI=1µF, CO=2.2µF, C
Figure 1 : Output Voltage vs Temp erature
Figure 2 : Output Voltage vs Temp erature
Figure 4 : Load Regulation vs Temperature
Figure 5 : Dropout Voltage vs Temperature
BYP
=100nF)
Figure 3 : Line Regulation vs Temperature
4/11
Figure 6 : Short Circuit Currennt vs Dropout
Voltage
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