SGS Thomson Microelectronics LD2985BM33R, LD2985BM32R, LD2985BM31R, LD2985BM30R, LD2985BM28R Datasheet

LD2985

SERIES

VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION

■VERY LOW DROPOUT VOLTAGE (280mV AT 150mA AND 7mV AT 1mA LOAD)

■VERY LOW QUIESCENT CURRENT (2mA TYP. AT 150mA LOAD AND 80μA AT NO LOAD)

■OUTPUT CURRENT UP TO 150mA

■LOGIC CONTROLLED ELECTRONIC SHUTDOWN

■OUTPUT VOLTAGE OF 1.5, 1.8, 2.5, 2.8, 2.85, 3, 3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5V

■INTERNAL CURRENT AND THERMAL LIMIT

■AVAILABLE IN ± 1% TOLLERANCE (AT 25°C, A VERSION)

■LOW OUTPUT NOISE VOLTAGE 30μVrms

■SMALLEST PACKAGE SOT23-5L

■TEMPERATURE RANGE: -40°C TO 125°C

DESCRIPTION

The LD2985 is a 150mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1µA when INHIBIT pin is pulled low. Shutdown Logic Control Function

SOT23-5L

is available on pin 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.

An external capacitor, CBYP=10nF, connected between bypass pin and GND reduce the noise to 30µVrms.

Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.

SCHEMATIC DIAGRAM

July 2003

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LD2985 SERIES

ABSOLUTE MAXIMUM RATINGS

Symbol	Parameter	Value	Unit
VI	DC Input Voltage	16	V
VINH	INHIBIT Input Voltage	16	V
IO	Output Current	Internally limited
Ptot	Power Dissipation	Internally limited
Tstg	Storage Temperature Range	-65 to +150	°C
Top	Operating Junction Temperature Range	-40 to +125	°C

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

THERMAL DATA

Symbol	Parameter	SOT23-5L	Unit
Rthj-case	Thermal Resistance Junction-case	81	°C/W

CONNECTION DIAGRAM (top view)	PIN DESCRIPTION
	Pin N°	Symbol	Name and Function
	1	IN	Input Port
	2	GND	Ground Pin
	3	INHIBIT	Control switch ON/OFF. Inhibit is not
			internally pulled-up; it cannot be left
			floating. Disable the device when
			connected to GND or to a positive
			voltage less than 0.18V
	4	Bypass	Bypass Pin: Capacitor to be
SOT23-5L			connected to GND in order to
			improve the thermal noise
			performances.
	5	OUT	Output Port
ORDERING CODES
A VERSION	B VERSION		OUTPUT VOLTAGES
LD2985AM15R	LD2985BM15R		1.5V
LD2985AM18R	LD2985BM18R		1.8V
LD2985AM25R	LD2985BM25R		2.5V
LD2985AM28R	LD2985BM28R		2.8V
LD2985AM285R	LD2985BM285R		2.85V
LD2985AM30R	LD2985BM30R		3.0V
LD2985AM31R	LD2985BM31R		3.1V
LD2985AM32R	LD2985BM32R		3.2V
LD2985AM33R	LD2985BM33R		3.3V
LD2985AM35R	LD2985BM35R		3.5V
LD2985AM36R	LD2985BM36R		3.6V
LD2985AM38R	LD2985BM38R		3.8V
LD2985AM40R	LD2985BM40R		4.0V
LD2985AM47R	LD2985BM47R		4.7V
LD2985AM50R	LD2985BM50R		5.0V
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LD2985 SERIES

ELECTRICAL CHARACTERISTICS FOR LD2985A (TJ = 25°C, V I=VO+1V, IO=1mA, VSHDN=2V, CI = 1μF, CO = 1μF, unless otherwise specified)

Symbol	Parameter	Test Conditions		Min.	Typ.	Max.	Unit
VOp	Operating Input Voltage			2.5		16	V
VO	Output Voltage	VI = 2.5V		1.485	1.5	1.515	V
		IO = 1 to 50mA		1.462		1.538	V
		IO = 1 to 50mA	TJ= -40 to 125°C	1.447		1.553	V
VO	Output Voltage	VI = 2.8V		1.782	1.8	1.818	V
		IO = 1 to 150mA		1.755		1.845	V
		IO = 1 to 150mA	TJ= -40 to 125°C	1.737		1.863	V
VO	Output Voltage	VI = 3.5V		2.475	2.5	2.525	V
		IO = 1 to 150mA		2.4375		2.5625	V
		IO = 1 to 150mA	TJ= -40 to 125°C	2.4125		2.5875	V
VO	Output Voltage	VI = 3.8V		2.772	2.8	2.828	V
		IO = 1 to 150mA		2.730		2.870	V
		IO = 1 to 150mA	TJ= -40 to 125°C	2.702		2.898	V
VO	Output Voltage	VI = 3.85V		2.821	2.85	2.879	V
		IO = 1 to 50mA		2.778		2.921	V
		IO = 1 to 50mA	TJ= -40 to 125°C	2.750		2.950	V
VO	Output Voltage	VI = 4.0V		2.970	3.0	3.030	V
		IO = 1 to 150mA		2.925		3.075	V
		IO = 1 to 150mA	TJ= -40 to 125°C	2.895		3.105	V
VO	Output Voltage	VI = 4.1V		3.069	3.1	3.131	V
		IO = 1 to 150mA		3.022		3.1775	V
		IO = 1 to 150mA	TJ= -40 to 125°C	2.9915		3.2085	V
VO	Output Voltage	VI = 4.2V		3.168	3.2	3.232	V
		IO = 1 to 150mA		3.120		3.280	V
		IO = 1 to 150mA	TJ= -40 to 125°C	3.088		3.312	V
VO	Output Voltage	VI = 4.3V		3.267	3.3	3.333	V
		IO = 1 to 150mA		3.2175		3.3825	V
		IO = 1 to 150mA	TJ= -40 to 125°C	3.1845		3.4155	V
VO	Output Voltage	VI = 4.5V		3.465	3.5	3.535	V
		IO = 1 to 150mA		3.412		3.587	V
		IO = 1 to 150mA	TJ= -40 to 125°C	3.377		3.622	V
VO	Output Voltage	VI = 4.6V		3.564	3.6	3.636	V
		IO = 1 to 150mA		3.510		3.690	V
		IO = 1 to 150mA	TJ= -40 to 125°C	3.474		3.726	V
VO	Output Voltage	VI = 4.8V		3.762	3.8	3.838	V
		IO = 1 to 150mA		3.705		3.895	V
		IO = 1 to 150mA	TJ= -40 to 125°C	3.667		3.933	V
VO	Output Voltage	VI = 5.0V		3.96	4	4.04	V
		IO = 1 to 150mA		3.9		4.1	V
		IO = 1 to 150mA	TJ= -40 to 125°C	3.86		4.14	V

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LD2985 SERIES

Symbol	Parameter		Test Conditions		Min.	Typ.	Max.	Unit
VO	Output Voltage	VI = 5.7V			4.653	4.7	4.747	V
		IO = 1 to 150mA			4.582		4.817	V
		IO = 1 to 150mA		TJ= -40 to 125°C	4.5355		4.8645	V
VO	Output Voltage	VI = 6.0V			4.95	5	5.05	V
		IO = 1 to 150mA			4.875		5.125	V
		IO = 1 to 150mA		TJ= -40 to 125°C	4.825		5.175	V
ISC	Short Circuit Current	RL = 0				400		mA
VO/ VI	Line Regulation	VI = VO+1V to 16V, IO = 1mA				0.003	0.014	%/VI
		VI = VO+1V to 16V, IO = 1mA					0.032	%/VI
		TJ= -40 to 125°C
Vd	Dropout Voltage	IO = 0				1	3	mV
		IO = 0	TJ= -40 to 125°C				5	mV
		IO = 1mA				7	10	mV
		IO = 1mA	TJ= -40 to 125°C				15	mV
		IO = 10mA				40	60	mV
		IO = 10mA TJ= -40 to 125°C					90	mV
		IO = 50mA				120	150	mV
		IO = 50mA TJ= -40 to 125°C					225	mV
		IO = 150mA				280	350	mV
		IO = 150mA TJ= -40 to 125°C					575	mV
Id	Quiescent Current	IO = 0				80	100	μA
		IO = 0	TJ= -40 to 125°C				150	μA
		IO = 1mA				100	150	μA
		IO = 1mA	TJ= -40 to 125°C				200	μA
		IO = 10mA				200	300	μA
		IO = 10mA TJ= -40 to 125°C					400	μA
		IO = 50mA				600	900	μA
		IO = 50mA TJ= -40 to 125°C					1200	μA
		IO = 150mA				2000	3000	μA
		IO = 150mA TJ= -40 to 125°C					4000	μA
		OFF MODE	VINH<0.18V			0		μA
		OFF MODE	VINH<0.18V				2	μA
		TJ= -40 to 125°C
SVR	Supply Voltage Rejection	CBYP = 0.01μFCO = 10μF f = 1KHz				45		dB
VIL	Control Input Logic Low	TJ= -40 to 125°C					0.15	V
VIH	Control Input Logic High	TJ= -40 to 125°C			2			V
IiNH	Control Input Current	TJ= -40 to 125°C		VSHDN = 5V		5	15	μA
		TJ= -40 to 125°C		VSHDN = 0V		0	-1	μA
eN	Output Noise Voltage	B= 300Hz to 50KHz				30		μV
		CBYP = 0.01μF		CO = 10μF

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