ST LD1086 User Manual

LD1086XX

LD1086

SERIES

1.5A LOW DROP POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED

■TYPICAL DROPOUT 1.3V AT 1.5A

■THREE TERMINAL ADJUSTABLE OR FIXED OUTPUT VOLTAGE 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 3.6V, 5V, 8V, 9V, 12V.

■GUARANTEED OUTPUT CURRENT UP TO 1.5A

■OUPUT TOLERANCE ±1% AT 25°C AND

±2% IN FULL TEMPERATURE RANGE

■INTERNAL POWER AND THERMAL LIMIT

■WIDE OPERATING TEMPERATURE RANGE -40°C TO 125°C

■PACKAGE AVAILABLE : TO-220, D2PAK, D2PAK/A, DPAK

■PINOUT COMPATIBILITY WITH STANDARD ADJUSTABLE VREG

TO-220

DPAK

D2PAK

D2PAK/A

DESCRIPTION

The LD1086 is a LOW DROP Voltage Regulator able to provide up to 1.5A of Output Current. Dropout is guaranteed at a maximum of 1.5V at the maximum output current, decreasing at lower loads. The LD1086 is pin to pin compatible with the 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 regulators, where a part of the output current is wasted as quiescent current, the LD1086 quiescent current flows into the load, so increase efficiency. Only a 10µF minimum capacitor is need for stability. The device is supplied in TO-220, D2PAK, D2PAK/A and DPAK. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ±1% at 25°C.

SCHEMATIC DIAGRAM

October 2002

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LD1086 SERIES

ABSOLUTE MAXIMUM RATINGS

Symbol	Parameter²	Value	Unit
VI	DC Input Voltage	30	V
IO	Output Current	Internally Limited	mA
PD	Power Dissipation	Internally Limited	mW
Tstg	Storage Temperature Range	-55 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	TO-220	D2PAK	DPAK	Unit
Rthj-case	Thermal Resistance Junction-case	3	3	8	°C/W
Rthj-amb	Thermal Resistance Junction-ambient	50	62.5		°C/W

APPLICATION CIRCUITS

R2

VO = VREF (1 + ¾¾)

R1

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LD1086 SERIES

CONNECTION DIAGRAM (top view)

TO-220	D2PAK
DPAK	D2PAK/A

ORDERING CODES

TO-220	D2PAK (*)	D2PAK/A (*)	DPAK (*)	OUTPUT VOLTAGE
LD1086V15	LD1086D2T15	LD1086D2M15	LD1086DT15	1.5 V
LD1086V18	LD1086D2T18	LD1086D2M18	LD1086DT18	1.8 V
LD1086V25	LD1086D2T25	LD1086D2M25	LD1086DT25	2.5 V
LD1086V28	LD1086D2T28	LD1086D2M28	LD1086DT28	2.85 V
LD1086V33	LD1086D2T33	LD1086D2M33	LD1086DT33	3.3 V
LD1086V36	LD1086D2T36	LD1086D2M36	LD1086DT36	3.6 V
LD1086V50	LD1086D2T50	LD1086D2M50	LD1086DT50	5.0 V
LD1086V80	LD1086D2T80	LD1086D2M80	LD1086DT80	8.0 V
LD1086V90	LD1086D2T90	LD1086D2M90	LD1086DT90	9.0 V
LD1086V12	LD1086D2T12	LD1086D2M12	LD1086DT12	12.0 V
LD1086V	LD1086D2T	LD1086D2M	LD1086DT	ADJ

(*) Available in Tape & Reel with the suffix "R" for fixed version and "-R" for adjustable version.

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LD1086 SERIES

ELECTRICAL CHARACTERISTICS OF LD1086#15 (VI=4.5V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)

Symbol	Parameter	Test Conditions		Min.	Typ.	Max.	Unit
VO	Output Voltage (note 1)	IO = 0 mA	TJ = 25°C	1.485	1.5	1.515	V
		IO = 0 to 1.5A	VI = 3.4 to 30V	1.47	1.5	1.53	V
VO	Line Regulation	IO = 0 mA	VI = 3.1 to 18V TJ = 25°C		0.2	4	mV
		IO = 0 mA	VI = 3.1 to 15V		0.4	4	mV
VO	Load Regulation	IO = 0 to 1.5A	TJ = 25°C		0.5	8	mV
		IO = 0 to 1.5A			1	16	V
Vd	Dropout Voltage	IO = 1.5A			1.3	1.5	V
Iq	Quiescent Current	VI ≤ 30V			5	10	mA
Isc	Short Circuit Current	VI - VO = 5V		1.5	2		A
		VI - VO = 25V		0.05	0.02		A
	Termal Regulation	TA = 25°C, 30ms pulse			0.01	0.04	%/W
SVR	Supply Voltage Rejection	f = 120 Hz,	CO = 25 μF, IO = 1.5A	60	82		dB
		VI = 6.5 ± 3V
eN	RMS Output Noise Voltage	TA = 25°C f =10Hz to 10KHz			0.003		%
	(% of VO)
S	Temperature Stability				0.5		%
S	Long Term Stability	TA = 125°C 1000Hrs			0.5		%

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

ELECTRICAL CHARACTERISTICS OF LD1086#18 (VI=4.8V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)

Symbol	Parameter	Test Conditions		Min.	Typ.	Max.	Unit
VO	Output Voltage (note 1)	IO = 0 mA	TJ = 25°C	1.782	1.8	1.818	V
		IO = 0 to 1.5A	VI = 3.4 to 30V	1.764	1.8	1.836	V
VO	Line Regulation	IO = 0 mA	VI = 3.4 to 18V TJ = 25°C		0.2	4	mV
		IO = 0 mA	VI = 3.4 to 15V		0.4	4	mV
VO	Load Regulation	IO = 0 to 1.5A	TJ = 25°C		0.5	8	mV
		IO = 0 to 1.5A			1	16	V
Vd	Dropout Voltage	IO = 1.5A			1.3	1.5	V
Iq	Quiescent Current	VI ≤ 30V			5	10	mA
Isc	Short Circuit Current	VI - VO = 5V		1.5	2		A
		VI - VO = 25V		0.05	0.02		A
	Termal Regulation	TA = 25°C, 30ms pulse			0.01	0.04	%/W
SVR	Supply Voltage Rejection	f = 120 Hz,	CO = 25 μF, IO = 1.5A	60	82		dB
		VI = 6.8 ± 3V
eN	RMS Output Noise Voltage	TA = 25°C f =10Hz to 10KHz			0.003		%
	(% of VO)
S	Temperature Stability				0.5		%
S	Long Term Stability	TA = 125°C 1000Hrs			0.5		%

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

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LD1086 SERIES

ELECTRICAL CHARACTERISTICS OF LD1086#25 (VI=5.5V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)

Symbol	Parameter	Test Conditions		Min.	Typ.	Max.	Unit
VO	Output Voltage (note 1)	IO = 0 mA	TJ = 25°C	2.475	2.5	2.525	V
		IO = 0 to 1.5A	VI = 4.1 to 30V	2.45	2.5	2.55	V
VO	Line Regulation	IO = 0 mA	VI = 4.1 to 18V TJ = 25°C		0.2	4	mV
		IO = 0 mA	VI = 4.1 to 18V		0.4	4	mV
VO	Load Regulation	IO = 0 to 1.5A	TJ = 25°C		0.5	8	mV
		IO = 0 to 1.5A			1	16	V
Vd	Dropout Voltage	IO = 1.5A			1.3	1.5	V
Iq	Quiescent Current	VI ≤ 30V			5	10	mA
Isc	Short Circuit Current	VI - VO = 5V		1.5	2		A
		VI - VO = 25V		0.05	0.2		A
	Termal Regulation	TA = 25°C, 30ms pulse			0.008	0.04	%/W
SVR	Supply Voltage Rejection	f = 120 Hz,	CO = 25 μF, IO = 1.5A	60	81		dB
		VI = 7.5 ± 3V
eN	RMS Output Noise Voltage	TA = 25°C f =10Hz to 10KHz			0.003		%
	(% of VO)
S	Temperature Stability				0.5		%
S	Long Term Stability	TA = 125°C 1000Hrs			0.5		%

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

ELECTRICAL CHARACTERISTICS OF LD1086#285 (VI=5.85V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)

Symbol	Parameter	Test Conditions		Min.	Typ.	Max.	Unit
VO	Output Voltage (note 1)	IO = 0 mA	TJ = 25°C	2.821	2.85	2.879	V
		IO = 0 to 1.5A	VI = 4.5 to 30V	2.793	2.85	2.907	V
VO	Line Regulation	IO = 0 mA	VI = 4.5 to 18V TJ = 25°C		0.2	6	mV
		IO = 0 mA	VI = 4.5 to 18V		0.5	6	mV
VO	Load Regulation	IO = 0 to 1.5A	TJ = 25°C		1	12	mV
		IO = 0 to 1.5A			2	20	V
Vd	Dropout Voltage	IO = 1.5A			1.3	1.5	V
Iq	Quiescent Current	VI ≤ 30V			5	10	mA
Isc	Short Circuit Current	VI - VO = 5V		1.5	2		A
		VI - VO = 25V		0.05	0.2		A
	Termal Regulation	TA = 25°C, 30ms pulse			0.01	0.04	%/W
SVR	Supply Voltage Rejection	f = 120 Hz,	CO = 25 μF, IO = 1.5A	60	80		dB
		VI = 7.85 ± 3V
eN	RMS Output Noise Voltage	TA = 25°C f =10Hz to 10KHz			0.003		%
	(% of VO)
S	Temperature Stability				0.5		%
S	Long Term Stability	TA = 125°C 1000Hrs			0.5		%

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

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LD1086 SERIES

ELECTRICAL CHARACTERISTICS OF LD1086#33 (VI=6.3V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)

Symbol	Parameter			Test Conditions			Min.	Typ.	Max.	Unit
VO	Output Voltage (note 1)	IO		= 0 mA	TJ = 25°C		3.267	3.3	3.333	V
		I	O	= 0 to 1.5A‘		V = 4.9 to 30V	3.234	3.35	3.366	V
						I
VO	Line Regulation	IO		= 0 mA	VI = 4.9 to 18V TJ = 25°C			0.5	6	mV
		IO		= 0 mA	VI = 4.9 to 18V			1	6	mV
VO	Load Regulation	IO		= 0 to 1.5A		TJ = 25°C		1	10	mV
		IO		= 0 to 1.5A				7	25	V
Vd	Dropout Voltage	IO		= 1.5A				1.3	1.5	V
Iq	Quiescent Current	VI		≤ 30V				5	10	mA
Isc	Short Circuit Current	VI		- VO = 5V			1.5	2		A
		VI - VO = 25V					0.05	0.2		A
	Termal Regulation	TA = 25°C, 30ms pulse						0.008	0.04	%/W
SVR	Supply Voltage Rejection	f = 120 Hz,			CO = 25 μF, IO = 1.5A		60	79		dB
		VI		= 8.3 ± 3V
eN	RMS Output Noise Voltage	TA = 25°C			f =10Hz to 10KHz			0.003		%
	(% of VO)
S	Temperature Stability							0.5		%
S	Long Term Stability	TA = 125°C			1000Hrs			0.5		%

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

ELECTRICAL CHARACTERISTICS OF LD1086#36 (VI=6.6V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)

Symbol	Parameter	Test Conditions		Min.	Typ.	Max.	Unit
VO	Output Voltage (note 1)	IO = 0 mA	TJ = 25°C	3.564	3.6	3.636	V
		IO = 0 to 1.5A	VI = 5.2 to 30V	3.528	3.6	3.672	V
VO	Line Regulation	IO = 0 mA	VI = 5.2 to 18V TJ = 25°C		0.5	10	mV
		IO = 0 mA	VI = 5.2 to 18V		1	10	mV
VO	Load Regulation	IO = 0 to 1.5A	TJ = 25°C		3	15	mV
		IO = 0 to 1.5A			7	25	V
Vd	Dropout Voltage	IO = 1.5A			1.3	1.5	V
Iq	Quiescent Current	VI ≤ 30V			5	10	mA
Isc	Short Circuit Current	VI - VO = 5V		1.5	2		A
		VI - VO = 25V		0.05	0.2		A
	Termal Regulation	TA = 25°C, 30ms pulse			0.01	0.04	%/W
SVR	Supply Voltage Rejection	f = 120 Hz,	CO = 25 μF, IO = 1.5A	60	78		dB
		VI = 8.6 ± 3V
eN	RMS Output Noise Voltage	TA = 25°C f =10Hz to 10KHz			0.003		%
	(% of VO)
S	Temperature Stability				0.5		%
S	Long Term Stability	TA = 125°C 1000Hrs			0.5		%

NOTE 1: See short-circuit current curve for available output current at fixed dropout.

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