SGS Thomson Microelectronics LK112SM37TR, LK112SM36TR, LK112SM33TR, LK112SM32TR, LK112SM31TR Datasheet

LK112S

SERIES

LOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION

■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<f<80KHz

■WIDE RANGE OF OUTPUT VOLTAGES

■INTERNAL CURRENT AND THERMAL LIMIT

■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

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LK112S SERIES

ABSOLUTE MAXIMUM RATINGS

Symbol	Parameter²	Value	Unit
VI	DC Input Voltage	16	V
VSHDN	Shutdown Input Voltage	16	V
IO	Output Current	Internally limited
Tstg	Storage Temperature Range	-55 to +150	°C
Top	Operating Junction Temperature Range	-30 to +80	°C

CONNECTION DIAGRAM (top view)	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.
SOT23-5L	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, V IN=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	ON MODE (except ISHDN)					175		250	μA
		OFF MODE	VI = 8V		VSHDN = 0V		0		0.1	μA
VO	Output Voltage	IO = 30mA				(see table)
VO	Line Regulation	VI = VO+1V to VO+6V,			VO ≤ 5.6V		0.7		20	mV
		VI = VO+1V to VO+6V,			VO > 5.6V		0.8		40	mV
VO	Load Regulation	IO = 1 to 60mA					15		30	mV
		IO = 1 to 200mA					30		90	mV
Vd	Dropout Voltage	IO = 60 mA (see Note 2)					0.17		0.24	V
		IO = 200 mA (see Note 2)					0.35		0.5	V
ISC	Short Circuit Current					200				mA
SVR	Supply Voltage Rejection	VI = VO+1.5V		CBYP = 0.1μF			55			dB
		CO = 10μF	f = 400Hz		IO = 30mA
eN	Output Noise Voltage	B= 10Hz to 80KHz		CBYP = 0.1μF			30			μVrms
		CO = 10μF VI = VO+1.5V,IO = 60mA
ISHDN	Shutdown Input Current	VSHDN = 1.8V		Output ON			12		35	μA
VSHDN	Shutdown Input Logic	Output ON				1.8			0.6	V
		Output OFF								V
VO/Tj	Output Voltage	IO = 10mA					0.09			mV/°C
	Temperature Coefficient
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
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				LK112S SERIES
ORDERING NUMBERS AND OUTPUT VOLTAGE
Part Number	Output Voltage	VOUT Min	VOUT 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

(*) Available on request

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LK112S SERIES

TYPICAL CHARACTERISTICS (unless otherwise specified Tj = 25°C, C I=1μF, CO=2.2μF, CBYP=100nF)

Figure 1 : Output Voltage vs Temperature Figure 4 : Load Regulation vs Temperature

Figure 2 : Output Voltage vs Temperature

Figure 5 : Dropout Voltage vs Temperature

Figure 3 : Line Regulation vs Temperature

Figure 6 : Short Circuit Currennt vs Dropout

Voltage

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