SGS Thomson Microelectronics LD2979Z50, LD2979Z38, LD2979Z33, LD2979Z32, LD2979Z30 Datasheet

	LD2979
	SERIES
	VERY LOW DROP
	VOLTAGE REGULATORS WITH INHIBIT

■VERY LOW DROPOUT VOLTAGE (0.2V TYP. AT 50mA LOAD)

■VERY LOW QUIESCENT CURRENT (TYP. 500μA AT50mA LOAD)

■OUTPUT CURRENT UP TO 50 mA

■LOGIC-CONTROLLED ELECTRONIC SHUTDOWN

■OUTPUT VOLTAGES OF 2.85; 3.0; 3.2; 3.3; 3.8; 5.0V

■INTERNAL CURRENT AND THERMAL LIMIT

■SUPPLY VOLTAGE REJECTION: 63dB (TYP)

■ONLY 1μF FOR STABILITY

■SELECTION AT 25 oC

■TEMPERATURE RANGE: -25 TO 125 oC

■PACKAGE AVAILABLE:SOT23-5L AND TO-92

DESCRIPTION

SOT23-5L

TO-92

The LD2979 series are very Low Drop regulators available in SOT23-5L and TO-92.

The very low drop-voltage and the very low quiescent current make them particularly suitable for low noise, low power applications and in battery powered systems.

Shutdown Logic Control function is available on five pin version (TTL compatible). This means

that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption.

SCHEMATIC DIAGRAM

April 2000

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LD2979

ABSOLUTE MAXIMUM RATING

Symbol	Parameter	Value			Unit
VIN	DC Input Voltage		16		V
VI NH	DC Inhibit Input Voltage		VI N		V
Io	Output Current	Internally		limited	mA
Ptot	Power Dissipation	Internally		limited	mW
Tst g	Storage Temperature Range	- 40	to	150	o C
Top	Operating Junction Temperature Range	- 25	to	125	o C

CONNECTION DIAGRAM (top view)

BOTTOM

VIEW

	SOT23-5L		TO-92
SYMBOL	NAME AND FUNCTION		PIN NUMBER
		SOT23-5L	TO-92
VI N	Input Voltage	1	3
GND	Ground	2	2
INHIBIT	Control Switch ON/OFF (*)	3	-
NC	Not to be connected	4	-
VOUT	Output Voltage	5	1

(*) Only for the version in SOT23-5L package: Inhibit pin is not internally pulled-up then it must not be left floating. Connect to a positive voltage higher than 2V to able the device.

ORDERING NUMBERS

	SOT23-5L	TO-92	Output Voltage
LD2979M28	LD2979Z28		2.85 V
LD2979M30	LD2979Z30		3.0 V
LD2979M32	LD2979Z32		3.2 V
LD2979M33	LD2979Z33		3.3 V
LD2979M38	LD2979Z38		3.8 V
LD2979M50	LD2979Z50		5.0 V

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LD2979

ELECTRICAL CHARACTERISTICS FOR LD2979 (refer to the test circuits, Ta = 25 oC, VIN = VO(NOM) +1, CO = 1 μF, IO = 1mA, Vinh = 2V(*)) (unless otherwise specified)

Symbol	Parameter	Test Conditions				Min.	Typ.	Max.	Unit
Vo	Output Voltage	VIN = 3.85 V		-25 < Ta < 125 oC		2.793	2.85	2.907	V
		1 < Io < 50 mA,				2.736		2.964	V
Vo	Output Voltage	VIN = 4 V		-25 < Ta < 125 oC		2.940	3	3.060	V
		1 < Io < 50 mA,				2.880		3.120	V
Vo	Output Voltage	VIN = 4.2 V		-25 < Ta < 125 oC		3.136	3.2	3.264	V
		1 < Io < 50 mA,				3.072		3.328	V
Vo	Output Voltage	VIN = 4.3 V		-25 < Ta < 125 oC		3.234	3.3	3.366	V
		1 < Io < 50 mA,				3.168		3.432	V
Vo	Output Voltage	VIN = 4.8 V		-25 < Ta < 125 oC		3.724	3.8	3.876	V
		1 < Io < 50 mA,				3.648		3.952	V
Vo	Output Voltage	VIN = 6 V		-25 < Ta < 125 oC		4.9	5	5.1	V
		1 < Io < 50 mA,				4.8		5.2	V
Io ut	Output Current Limit					100			mA
Vo	Line Regulation	VO(NOM) +1 < VIN < 16V,			Io = 1 mA			0.028	%/Vin
		-25 < Ta < 125 oC						0.064
Id	Quiescent Current	ON MODE							μA
		Io = 0 mA	-25 < Ta < 125 oC				80	110
		Io = 0 mA						170	μA
		Io = 50 mA	-25< Ta < 125 oC				500	700	μA
		Io = 50 mA						1300	μA
		OFF MODE (*)							μA
		Vihn < 0.18 V	-25 < Ta < 125 oC				0
		Vihn < 0.18 V						1	μA
SVR	Supply Voltage Rejection	Io = 50 mA,	f = 120 Hz,		Cout = 10 μF		63		dB
Vd	Dropout Voltage	Io = 0 mA	-25 < Ta < 125 oC				6	12	mV
		Io = 0 mA						18	mV
		Io = 1 mA	-25 < Ta < 125 oC				30	60	mV
		Io = 1 mA						90	mV
		Io = 10 mA	-25< Ta < 125 oC				100	200	mV
		Io = 10 mA						300	mV
		Io = 50 mA	-25< Ta < 125 oC				200	400	mV
		Io = 50 mA						600	mV
Vil	Control Input Logic Low	-25 < Ta < 125 oC (*)			Device Off			0.18	V
Vih	Control Input Logic High	-25 < Ta < 125 oC (*)			Device On	2			V
Ii	Control Input Current	Vinhibit = 0 V (*)		-25 < Ta < 125 oC (*)			0	-1	μA
		Vinhibit = 5 V,					5	15	μA
eN	Output Noise Voltage (RMS)	BW = 300 Hz to 50 KHz, Cout = 10 μF					160		μV

(*) Note: Only for types in SOT23-5L

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