SGS Thomson Microelectronics LD1085V120, LD1085V, LD1085D2T90, LD1085D2T80, LD1085D2T50 Datasheet

	LD1085
	SERIES
	3A LOW DROP FIXED AND ADJUSTABLE
	POSITIVE VOLTAGE REGULATORS

■TYPICAL DROPOUT VOLTAGE 1.3V AT 3A

■THREE TERMINAL ADJUSTABLE OR FIXED OUTPUT VOLATGE 1.8V,2.5V, 2.85V, 3.3V, 3.6V, 5V, 8V, 9V, 12V

■GUARANTEED OUTPUT CURRENT UP TO 3A

■OUTPUT TOLERANCE ±1% AT 25oC AND

±2% IN FULL TEMPERATURE RANGE

■INTERNAL POWER AND THERMAL LIMIT

■WIDE OPERATING TEMPERATURE RANGE -40oC TO 125oC

■PACKAGE AVAILABLE: TO-220 D2PAK

■PINOUT COMPATIBILITY WITH STANDARD ADJUSTABLE VOLTAGE REGULATORS

DESCRIPTION

The LD1085 is a LOW DROP Voltage Regulator able to provide up to 3A of Output Current. Dropout is guaranteed at a maximum of 1.5V at the maximum output current, decreasing at lower loads. The LD1085 is pin compatible with older 3-terminal adjustable regulators, but has better performances in term of drop and output tolerance. A 2.85V output version is suitable for SCSI-2 active termination. Unlike PNP

D2PAK/A

TO-220

D2PAK

regulators, where a part of the output current is wasted as quiescent current, the LD1085 quiescent current flow into the load, so increase efficency. Only a 10 μF minimum capacitor is need for stability. The device is supplied in TO-220, D2PAK and D2PAK/A packages. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 1% at 25oC.

BLOCK DIAGRAM

May 2000

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LD1085 SERIES

ABSOLUTE MAXIMUM RATINGS

Symbol	Parameter	Value			Unit
VIN	DC Input Voltage		30		V
IOUT	Output Current	Internally		Limited	mA
Pto t	Power Dissipation	Internally		Limited	mW
Tstg	Storage Temperature Range	-50	to	150	o C
To p	Operating Junction Temperature Range	-40	to	125	o C

Absolute Maximum Ratings are those value beyond which damage to the device may occur. Functional operation under these condition is not implied. Over the above suggested Max Power Dissipation a Short Circuit could definetively damage the device.

THERMAL DATA

Symbol	Parameter	TO-220	D2PAK	Unit
Rthjca se	Thermal Resistance Junction-case	3	3	oC/W
Rthjamb	Thermal Resistance Junction-ambient	50	62.5	oC/W

APPLICATION CIRCUIT FOR FIXED AND ADJUSTABLE VERSION

VO = VREF (1 + R2)

R1

CONNECTION DIAGRAM AND ORDERING NUMBERS (top view)

TO-220		D2PAK	D2PAK/A
TO-220	D2PAK (**)	D2PAK/A (**)	Output Voltage
LD1085V18	LD1085D2T18	LD1085D2M18	1.8V
LD1085V25	LD1085D2T25	LD1085D2M25	2.5V
LD1085V28	LD1085D2T28	LD1085D2M28	2.85V
LD1085V33	LD1085D2T33	LD1085D2M33	3.3V
LD1085V36	LD1085D2T36	LD1085D2M36	3.6V
LD1085V50	LD1085D2T50	LD1085D2M50	5V
LD1085V80	LD1085D2T80	LD1085D2M80	8V
LD1085V90	LD1085D2T90	LD1085D2M90	9V
LD1085V120	LD1085D2T120	LD1085D2M120	12V
LD1085V	LD1085D2T	LD1085D2M	1.25 to 28V

(**) Available in Tape & Reel with the suffix ºRº for fixed version and º-Rº for adjustable version.

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LD1085 SERIES

ELECTRICAL CHARACTERISTICS FOR LD1086#18 (refer to the test circuits,
Tj = -40 to 125 oC, VIN = 4.8 V,		CIN = CO = 10 μF unless otherwise specified)
Symbol	Parameter	Test Conditions			Min.	Typ.	Max.	Unit
VO	Output Voltage	IO = 0 mA	Tj = 25 oC		1.782	1.8	1.818	V
VO	Output Voltage (Note 1)	IO = 0 to 3 A	VIN = 3.4 to 30 V		1.764	1.8	1.836	V
VO	Line Regulation	VIN = 3.4 to 18 V		IO = 0 mA Tj = 25 oC		0.2	4	mV
VO	Line Regulation	VIN = 3.4 to 18 V		IO = 0 mA		0.4	4	mV
VO	Load Regulation	IO = 0 to 3 A	Tj = 25 oC			2	10	mV
VO	Load Regulation	IO = 0 to 3 A				4	20	mV
Vd	Dropout Voltage	IO = 3 A				1.3	1.5	V
Id	Quiescent Current	VIN ≤ 30 V				5	10	mA
ISC	Short Circuit Current	VIN - VO = 5V			3.2	4.5		A
		VIN - VO = 25V			0.2	0.5
	Thermal Regulation	Ta = 25 oC	30ms Pulse			0.008	0.04	%/W
SVR	Supply Voltage Rejection	IO = 3 A f = 120 Hz CO = 25μF			60	75		dB
		VIN = 5.3 ± 1V
eN	Output Noise Voltage	B = 10Hz to 10KHz Ta = 25 oC				0.003		%
S	Temperature Stability					0.5		%
S	Long Term Stability	1000 hrs Ta = 125 oC				0.5		%

Note1: See short-circuit curve for available output current at fixed dropout.

ELECTRICAL CHARACTERISTICS FOR LD1085#25 (refer to the test circuits,
Tj = -40 to 125 oC, VIN = 5.5 V,		CIN = CO = 10 μF unless otherwise specified)
Symbol	Parameter	Test Conditions			Min.	Typ.	Max.	Unit
VO	Output Voltage	IO = 0 mA	Tj = 25 oC		2.475	2.5	2.525	V
VO	Output Voltage (Note 1)	IO = 0 to 3 A	Vin = 4.1 to 30 V		2.45	2.5	2.55	V
VO	Line Regulation	Vin = 4.1 to 18 V		IO = 0 mA Tj = 25 oC		0.2	5	mV
VO	Line Regulation	Vin = 4.1 to 18 V		IO = 0 mA		0.4	5	mV
VO	Load Regulation	IO = 0 to 3 A	Tj = 25 oC			2	10	mV
VO	Load Regulation	IO = 0 to 3 A				4	20	mV
Vd	Dropout Voltage	IO = 3 A				1.3	1.5	V
Id	Quiescent Current	Vin ≤ 30 V				5	10	mA
ISC	Short Circuit Current	VIN - VO = 5V			3.2	4.5		A
		VIN - VO = 25V			0.2	0.5
	Thermal Regulation	Ta = 25 oC	30ms Pulse			0.008	0.04	%/W
SVR	Supply Voltage Rejection	IO = 3 A f = 120 Hz CO = 25μF			60	72		dB
		Vin = 7.5 ± 3V
eN	Output Noise Voltage	B = 10Hz to 10KHz Ta = 25 oC				0.003		%
S	Temperature Stability					0.5		%
S	Long Term Stability	1000 hrs Ta = 125 oC				0.5		%

Note1: See short-circuit curve for available output current at fixed dropout.

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LD1085 SERIES

ELECTRICAL CHARACTERISTICS FOR LD1085#285 (refer to the test circuits,
Tj = -40 to 125 oC, VIN = 5.85 V,		CIN = CO = 10 μF unless otherwise specified)
Symbol	Parameter	Test Conditions			Min.	Typ.	Max.	Unit
VO	Output Voltage	IO = 0 mA	Tj = 25 oC		2.821	2.85	2.879	V
VO	Output Voltage (Note 1)	IO = 0 to 3 A	VIN = 4.5 to 30 V		2.793	2.85	2.907	V
VO	Line Regulation	VIN = 4.5 to 18 V		IO = 0 mA Tj = 25 oC		0.2	6	mV
VO	Line Regulation	VIN = 4.5 to 18 V		IO = 0 mA		0.5	6	mV
VO	Load Regulation	IO = 0 to 3 A	Tj = 25 oC			3	15	mV
VO	Load Regulation	IO = 0 to 3 A				7	20	mV
Vd	Dropout Voltage	IO = 3 A				1.3	1.5	V
Id	Quiescent Current	VIN ≤ 30 V				5	10	mA
ISC	Short Circuit Current	VIN - VO = 5V			3.2	4.5		A
		VIN - VO = 25V			0.2	0.5
	Thermal Regulation	Ta = 25 oC	30ms Pulse			0.008	0.04	%/W
SVR	Supply Voltage Rejection	IO = 3 A f = 120 Hz CO = 25μF			60	72		dB
		VIN = 7.85 ± 3V
eN	Output Noise Voltage	B = 10Hz to 10KHz Ta = 25 oC				0.003		%
S	Temperature Stability					0.5		%
S	Long Term Stability	1000 hrs Ta = 125 oC				0.5		%

Note1: See short-circuit curve for available output current at fixed dropout.

ELECTRICAL CHARACTERISTICS FOR LD1085#33 (refer to the test circuits,
Tj = -40 to 125 oC, VIN = 6.3 V,		CIN = CO = 10 μF unless otherwise specified)
Symbol	Parameter	Test Conditions			Min.	Typ.	Max.	Unit
VO	Output Voltage	IO = 0 mA	Tj = 25 oC		3.267	3.3	3.333	V
VO	Output Voltage (Note 1)	IO = 0 to 3 A	VIN = 4.9 to 30 V		3.234	3.3	3.366	V
VO	Line Regulation	VIN = 4.9 to 18 V		IO = 0 mA Tj = 25 oC		0.5	6	mV
VO	Line Regulation	VIN = 4.9 to 18 V		IO = 0 mA		1	6	mV
VO	Load Regulation	IO = 0 to 3 A	Tj = 25 oC			3	15	mV
VO	Load Regulation	IO = 0 to 3 A				7	20	mV
Vd	Dropout Voltage	IO = 3 A				1.3	1.5	V
Id	Quiescent Current	VIN ≤ 30 V				5	10	mA
ISC	Short Circuit Current	VIN - VO = 5V			3.2	4.5		A
		VIN - VO = 25V			0.2	0.5
	Thermal Regulation	Ta = 25 oC	30ms Pulse			0.008	0.04	%/W
SVR	Supply Voltage Rejection	IO = 3 A f = 120 Hz CO = 25μF			60	72		dB
		VIN = 8.3 ± 3V
eN	Output Noise Voltage	B = 10Hz to 10KHz Ta = 25 oC				0.003		%
S	Temperature Stability					0.5		%
S	Long Term Stability	1000 hrs Ta = 125 oC				0.5		%

Note1: See short-circuit curve for available output current at fixed dropout.

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LD1085 SERIES

ELECTRICAL CHARACTERISTICS FOR LD1085#36 (refer to the test circuits,
Tj = -40 to 125 oC, VIN = 5.85 V,		CIN = CO = 10 μF unless otherwise specified)
Symbol	Parameter	Test Conditions			Min.	Typ.	Max.	Unit
VO	Output Voltage	IO = 0 mA	Tj = 25 oC		3.564	3.6	3.636	V
VO	Output Voltage (Note 1)	IO = 0 to 3 A	VIN = 5.2 to 30 V		3.528	3.6	3.672	V
VO	Line Regulation	VIN = 5.2 to 18 V		IO = 0 mA Tj = 25 oC		0.5	10	mV
VO	Line Regulation	VIN = 5.2 to 18 V		IO = 0 mA		1	10	mV
VO	Load Regulation	IO = 0 to 3 A	Tj = 25 oC			3	15	mV
VO	Load Regulation	IO = 0 to 3 A				7	20	mV
Vd	Dropout Voltage	IO = 3 A				1.3	1.5	V
Id	Quiescent Current	VIN ≤ 30 V				5	10	mA
ISC	Short Circuit Current	VIN - VO = 5V			3.2	4.5		A
		VIN - VO = 25V			0.2	0.5
	Thermal Regulation	Ta = 25 oC	30ms Pulse			0.008	0.04	%/W
SVR	Supply Voltage Rejection	IO = 3 A f = 120 Hz CO = 25μF			60	72		dB
		VIN = 8.6 ± 3V
eN	Output Noise Voltage	B = 10Hz to 10KHz Ta = 25 oC				0.003		%
S	Temperature Stability					0.5		%
S	Long Term Stability	1000 hrs Ta = 125 oC				0.5		%

Note1: See short-circuit curve for available output current at fixed dropout.

ELECTRICAL CHARACTERISTICS FOR LD1085#50 (refer to the test circuits, Tj = -40 to 125 oC, VIN = 8 V, CIN = CO = 10 μF unless otherwise specified)

Symbol	Parameter	Test Conditions			Min.	Typ.	Max.	Unit
VO	Output Voltage	IO = 0 mA	Tj = 25 oC		4.95	5	5.05	V
VO	Output Voltage (Note 1)	IO = 0 to 3 A	VIN = 6.6 to 30 V		4.9	5	5.1	V
VO	Line Regulation	VIN = 6.6 to 20 V		IO = 0 mA Tj = 25 oC		0.5	10	mV
VO	Line Regulation	VIN = 6.6 to 20 V		IO = 0 mA		1	10	mV
VO	Load Regulation	IO = 0 to 3 A	Tj = 25 oC			5	20	mV
VO	Load Regulation	IO = 0 to 3 A				10	35	mV
Vd	Dropout Voltage	IO = 3 A				1.3	1.5	V
Id	Quiescent Current	VIN ≤ 30 V				5	10	mA
ISC	Short Circuit Current	VIN - VO = 5V			3.2	4.5		A
		VIN - VO = 25V			0.2	0.5
	Thermal Regulation	Ta = 25 oC	30ms Pulse			0.008	0.04	%/W
SVR	Supply Voltage Rejection	IO = 3 A f = 120 Hz CO = 25μF			60	72		dB
		VIN = 10 ± 3V
eN	Output Noise Voltage	B = 10Hz to 10KHz Ta = 25 oC				0.003		%
S	Temperature Stability					0.5		%
S	Long Term Stability	1000 hrs Ta = 125 oC				0.5		%

Note1: See short-circuit curve for available output current at fixed dropout.

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