SGS Thomson Microelectronics LD2981CM30TR, LD2981CM50TR, LD2981CM48TR, LD2981CM38TR, LD2981CM33TR Datasheet

	LD2981
	SERIES
	VERY LOW DROP
	VOLTAGE REGULATORS WITH INHIBIT

■ ULTRA LOW DROPOUT VOLTAGE

(0.2V AT 100mA LOAD, 7mV AT 1mA LOAD)

■VERY LOW QUIESCENT CURRENT

(MAX 1μA WHEN IS IN SHUTDOWN MODE)

■OUTPUT CURRENT UP TO 100 mA

■LOGIC-CONTROLLED ELECTRONIC SHUTDOWN

■OUTPUT VOLTAGES OF 2.85; 3.0; 3.2; 3.3; 3.8; 4.85; 5.0V

■INTERNAL CURRENT AND THERMAL LIMIT

■AVAILABLEIN ± 0.75% TOLLERANCE (AT 25oC, A VERSION)

■OUTPUT LOW NOISE VOLTAGE 160μVrms

■ONLY 4.7μF FOR STABILITY

■TEMPERATURE RANGE: -40 TO 125 oC

■SMALLEST PACKAGE SOT23-5L AND SOT-89

■FAST DYNAMIC RESPONCE TO LINE AND LOAD CHANGES

DESCRIPTION

The LD2981 series are 100mA fixed-output voltage regulator. The ultra drop-voltage and the ultra low quiescent current make them particularly suitable for low noise, low power applications and in battery powered systems.

SCHEMATIC DIAGRAM

SOT23-5L SOT-89

In sleep mode quiescent current is less than 1μA when INHIBIT pis is pulled low. Shutdown Logic Control function is available on pin n.3 (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. Typlical application are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.

April 2000

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LD2981

ABSOLUTE MAXIMUM RATING

Symbol	Parameter	Value			Unit
VIN	DC Input Voltage		16		V
VI NH	INHBIT Input Voltage		16		V
Io	Output Current	Internally		limited	mA
Ptot	Power Dissipation	Internally		limited	mW
Tst g	Storage Temperature Range	- 55	to	150	o C
Top	Operating Junction Temperature Range	- 40	to	125	o C

THERMAL DATA

Symbol	Parameter	SOT-89	SOT23-5L	Unit
Rthjca se	Thermal Resistance Junction-case	15	81	oC/W

CONNECTION DIAGRAM (top view)

SOT23-5L

SOT-89

(*) Inhibit pin is not internally pulled-up then it must not be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18V

ORDERING NUMBERS

AB VERSION			C VERSION	Output Voltage
SOT23-5L	SOT-89	SOT23-5L	SOT-89
LD2981ABM28TR	LD2981ABU28TR	LD2981CM28TR	LD2981CU28TR	2.85 V
LD2981ABM30TR	LD2981ABU30TR	LD2981CM30TR	LD2981CU30TR	3.0 V
LD2981ABM32TR	LD2981ABU32TR	LD2981CM32TR	LD2981CU32TR	3.2 V
LD2981ABM33TR	LD2981ABU33TR	LD2981CM33TR	LD2981CU33TR	3.3 V
LD2981ABM38TR	LD2981ABU38TR	LD2981CM38TR	LD2981CU38TR	3.8 V
LD2981ABM48TR	LD2981ABU48TR	LD2981CM48TR	LD2981CU48TR	4.85 V
LD2981ABM50TR	LD2981ABU50TR	LD2981CM50TR	LD2981CU50TR	5.0 V

APPLICATION CIRCUIT

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									LD2981
ELECTRICAL CHARACTERISTICS FOR LD2981AB (refer to the test circuits, TJ = 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				2.828	2.85	2.872	V
		1	< Io < 100 mA		-40 < TJ < 125 oC	2.822		2.878	V
		1	< Io < 100 mA,			2.779		2.921	V
Vo	Output Voltage	VIN = 4 V				2.977	3	3.023	V
		1	< Io < 100 mA		-40 < TJ < 125 oC	2.970		3.030	V
		1	< Io < 100 mA,			2.925		3.075	V
Vo	Output Voltage	VIN = 4.2 V				3.176	3.2	3.224	V
		1	< Io < 100 mA		-40 < TJ < 125 oC	3.168		3.232	V
		1	< Io < 100 mA,			3.12		3.28	V
Vo	Output Voltage	VIN = 4.3 V				3.275	3.3	3.325	V
		1	< Io < 100 mA,		-40 < TJ < 125 oC	3.267		3.333	V
		1	< Io < 100 mA,			3.217		3.383	V
Vo	Output Voltage	VIN = 4.8 V				3.771	3.8	3.829	V
		1	< Io < 100 mA,		-40 < TJ < 125 oC	3.762		3.838	V
		1	< Io < 100 mA,			3.705		3.895	V
Vo	Output Voltage	VIN = 5.85 V				4.813	4.85	4.887	V
		1	< Io < 100 mA,		-40 < TJ < 125 oC	4.801		4.899	V
		1	< Io < 100 mA,			4.729		4.971	V
Vo	Output Voltage	VIN = 6 V				4.962	5	5.038	V
		1	< Io < 100 mA,		-40 < TJ < 125 oC	4.950		5.050	V
		1	< Io < 100 mA,			4.875		5.125	V
Io ut	Output Current Limit					150			mA
Vo	Line Regulation	VO(NOM) +1 < VIN < 16V, Io = 1 mA					0.003	0.014	%/Vin
		-40 < TJ < 125 oC						0.032
Id	Quiescent Current	ON MODE							μA
		Io = 0 mA		-40 < TJ < 125 oC			80	100
		Io = 0 mA						150	μA
		Io = 1 mA		-40 < TJ < 125 oC			100	150	μA
		Io = 1 mA						200	μA
		Io = 25 mA		-40 < TJ < 125 oC			250	400	μA
		Io = 25 mA						800	μA
		Io = 100 mA		-40 < TJ < 125 oC			800	1300	μA
		Io = 100 mA						2600	μA
		OFF MODE							μA
		VINH < 0.3 V		-40 < TJ < 125 oC				0.8
		VINH < 0.15 V						2	μA
SVR	Supply Voltage Rejection	f = 1 KHz, Cout = 10 μF					63		dB
Vd	Dropout Voltage	Io = 0 mA		-40 < TJ < 125 oC			1	3	mV
		Io = 0 mA						5	mV
		Io = 1 mA		-40 < TJ < 125 oC			7	10	mV
		Io = 1 mA						15	mV
		Io = 25 mA		-40 < TJ < 125 oC			70	100	mV
		Io = 25 mA						150	mV
		Io = 100 mA		-40 < TJ < 125 oC			200	250	mV
		Io = 100 mA						375	mV
Vil	Control Input Logic Low	LOW = Output OFF -40 < TJ < 125 oC						0.18	V
Vih	Control Input Logic High	HIGH = Output ON			-40 < TJ < 125 oC	2			V
Ii	Control Input Current	VINH = 0 V ,		-40 < TJ < 125 oC			0	-1	μA
		VINH = 5 V,		-40 < TJ < 125 oC			5	15	μA
eN	Output Noise Voltage (RMS)	BW = 300 Hz to 50 KHz, Cout = 10 μF					160		μV
ISC	Short Circuit Current	RL = 0				150			mA

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LD2981

ELECTRICAL CHARACTERISTICS FOR LD2981C (refer to the test circuits, TJ = 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				2.814	2.85	2.886	V
		1	< Io < 100 mA		-40 < TJ < 125 oC	2.793		2.907	V
		1	< Io < 100 mA,			2.750		2.950	V
Vo	Output Voltage	VIN = 4 V				2.962	3	3.038	V
		1	< Io < 100 mA		-40 < TJ < 125 oC	2.940		3.060	V
		1	< Io < 100 mA,			2.895		3.105	V
Vo	Output Voltage	VIN = 4.2 V				3.160	3.2	3.240	V
		1	< Io < 100 mA		-40 < TJ < 125 oC	3.136		3.264	V
		1	< Io < 100 mA,			3.088		3.312	V
Vo	Output Voltage	VIN = 4.3 V				3.259	3.3	3.341	V
		1	< Io < 100 mA,		-40 < TJ < 125 oC	3.234		3.366	V
		1	< Io < 100 mA,			3.184		3.416	V
Vo	Output Voltage	VIN = 4.8 V				3.752	3.8	3.848	V
		1	< Io < 100 mA,		-40 < TJ < 125 oC	3.724		3.876	V
		1	< Io < 100 mA,			3.667		3.933	V
Vo	Output Voltage	VIN = 5.85 V				4.789	4.85	4.911	V
		1	< Io < 100 mA,		-40 < TJ < 125 oC	4.753		4.947	V
		1	< Io < 100 mA,			4.680		5.020	V
Vo	Output Voltage	VIN = 6 V				4.937	5	5.063	V
		1	< Io < 100 mA,		-40 < TJ < 125 oC	4.900		5.100	V
		1	< Io < 100 mA,			4.825		5.175	V
Io ut	Output Current Limit					150			mA
Vo	Line Regulation	VO(NOM) +1 < VIN < 16V, Io = 1 mA					0.003	0.014	%/Vin
		-40 < TJ < 125 oC						0.032
Id	Quiescent Current	ON MODE							μA
		Io = 0 mA		-40 < TJ < 125 oC			80	100
		Io = 0 mA						150	μA
		Io = 1 mA		-40 < TJ < 125 oC			100	150	μA
		Io = 1 mA						200	μA
		Io = 25 mA		-40 < TJ < 125 oC			250	400	μA
		Io = 25 mA						800	μA
		Io = 100 mA		-40 < TJ < 125 oC			800	1300	μA
		Io = 100 mA						2600	μA
		OFF MODE							μA
		VINH < 0.3 V		-40 < TJ < 125 oC				0.8
		VINH < 0.15 V						2	μA
SVR	Supply Voltage Rejection	f = 1 KHz, Cout = 10 μF					63		dB
Vd	Dropout Voltage	Io = 0 mA		-40 < TJ < 125 oC			1	3	mV
		Io = 0 mA						5	mV
		Io = 1 mA		-40 < TJ < 125 oC			7	10	mV
		Io = 1 mA						15	mV
		Io = 25 mA		-40 < TJ < 125 oC			70	100	mV
		Io = 25 mA						150	mV
		Io = 100 mA		-40 < TJ < 125 oC			200	250	mV
		Io = 100 mA						375	mV
Vil	Control Input Logic Low	LOW = Output OFF -40 < TJ < 125 oC						0.18	V
Vih	Control Input Logic High	HIGH = Output ON			-40 < TJ < 125 oC	2			V
Ii	Control Input Current	VINH = 0 V ,		-40 < TJ < 125 oC			0	-1	μA
		VINH = 5 V,		-40 < TJ < 125 oC			5	15	μA
eN	Output Noise Voltage (RMS)	BW = 300 Hz to 50 KHz, Cout = 10 μF					160		μV
ISC	Short Circuit Current	RL = 0				150			mA

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