Linear Technology LT1086MK-5, LT1086MK-12, LT1086MK, LT1086MH, LT1086CH Datasheet

LT1086 Series

1.5A Low Dropout Positive

Regulators Adjustable and

Fixed 2.85V, 3.3V, 3.6V, 5V, 12V

FEATURES

■3-Terminal Adjustable or Fixed 2.85V, 3.3V, 3.6V, 5V, 12V

■Output Current of 1.5A, (0.5A for LT1086H)

■Operates Down to 1V Dropout

■Guaranteed Dropout Voltage at Multiple Current Levels

■Line Regulation: 0.015%

■Load Regulation: 0.1%

■100% Thermal Limit Functional Test

APPLICATIOUS

■SCSI-2 Active Terminator

■High Efficiency Linear Regulators

■Post Regulators for Switching Supplies

■Constant Current Regulators

■Battery Chargers

■Microprocessor Supply

DESCRIPTIOU

The LT ®1086 is designed to provide 1.5A with higher efficiency than currently available devices. All internal circuitry is designed to operate down to 1V input-to- output differential and the dropout voltage is fully specified as a function of load current. Dropout is guaranteed at a maximum of 1.5V at maximum output current, decreasing at lower load currents. On-chip trimming adjusts the reference/ouput voltage to 1%. Current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions.

The LT1086 is pin compatible with older 3-terminal adjustable regulators. A 10μF output capacitor is required on these new devices; however, this is usually included in most regulator designs.

A 2.85V output version is offered for SCSI-2 active termination. For surface mount applications see the LT1117- 2.85 data sheet. For high current or lower dropout requirements see the LT1123-2.85 data sheet.

Unlike PNP regulators, where up to 10% of the output current is wasted as quiescent current, the LT1086 quiescent current flows into the load, increasing efficiency.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIOU

LT1086 Dropout Voltage

	5V to 3.3V Regulator			(V)	2	INDICATES GUARANTEED TEST POINT
				DIFFERENTIAL		–55°C £ TJ £ 150°C
VIN ³ 4.75V	IN	LT1086-3.3 OUT	3.3V AT 1.5A			0°C £ TJ £ 125°C
		GND		INPUT/OUTPUT
	10µF*		10µF		1
	TANTALUM		TANTALUM					TJ = – 55°C
								TJ = 25°C
				MINIMUM				TJ = 150°C
		LT1086 • TA01
	*MAY BE OMITTED IF INPUT SUPPLY IS WELL
	BYPASSED WITHIN 2" OF THE LT1086				0	0.5	1
					0			1.5
						OUTPUT CURRENT (A)
								LT1086 • TA02

1

LT1086 Series

ABSOLUTE WAXIWUW RATINGSU

Power Dissipation...............................	Internally Limited
Input Voltage (Note 1) .............................................	30V
Operating Input Voltage
Adjustable Devices ...........................................	25V
2.85V Devices ..................................................	18V
3.3V, 3.6V, and 5V Devices ...............................	20V
12V Devices ......................................................	25V
Operating Junction Temperature Range
“C” Grades	0°C to 125°C
Control Section ...............................
Power Transistor .............................	0°C to 150°C
“I” Grades	– 40°C to 125°C
Control Section ..........................
Power Transistor ........................	– 40°C to 150°C

PACKAGE/ORDER IUFORWATIOU

					ORDER
		BOTTOM VIEW			PART NUMBER
			ADJ
	2				LT1086CH
VIN		1 3		VOUT	LT1086MH
				(CASE)
		H PACKAGE
3-LEAD TO-39 METAL CAN
		θJA = 150°C/W
		BOTTOM VIEW			ORDER
					PART NUMBER
VIN				CASE
				IS OUTPUT
	2				LT1086CK
					LT1086CK-5
	1				LT1086CK-12
ADJ (GND)*					LT1086IK
		K PACKAGE			LT1086IK-5
	2-LEAD TO-3 METAL CAN				LT1086IK-12
		θJA = 35°C/W
					LT1086MK
					LT1086MK-5
					LT1086MK-12
*For fixed versions.

“M” Grades	– 55°C to 150°C
Control Section ..........................
Power Transistor ........................	– 55°C to 200°C
Storage Temperature Range .................	– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................	300°C

Note 1: Although the device’s maximum operating voltage is limited, (18V for a 2.85V device, 20V for a 5V device, and 25V for adjustable and

12V devices) the devices are guaranteed to withstand transient input voltages up to 30V. For input voltages greater than the maximum operating input voltage some degradation of specifications will occur. For fixed voltage devices operating at input/output voltage differentials greater than 15V, a minimum external load of 5mA is required to maintain regulation.

PRECOUDITIOUIUG

100% Thermal Shutdown Functional Test.

			FRONT VIEW							ORDER
	TAB IS		3				VIN			PART NUMBER
			2				VOUT			LT1086CM
	OUTPUT
										LT1086CM-3.3
							(GND)*
			1				ADJ			LT1086CM-3.6
			M PACKAGE
			3-LEAD PLASTIC DD							LT1086IM
			θJA = 30°C/W**
										LT1086IM-3.3
** WITH PACKAGE SOLDERED TO 0.5IN2 COPPER AREA
OVER BACKSIDE GROUND PLANE OR INTERNAL POWER										LT1086IM-3.6
PLANE. θJA CAN VARY FROM 20°C/W TO >40°C/W
DEPENDING ON MOUNTING TECHNIQUE.
										ORDER
			FRONT VIEW							PART NUMBER
										LT1086CT
TAB IS			3						VIN
			2						VOUT	LT1086CT-2.85
OUTPUT
			1						ADJ	LT1086CT-3.3
									(GND)*	LT1086IT
			T PACKAGE
			3-LEAD PLASTIC TO-220							LT1086IT-5
			θJA = 50°C/W
										LT1086IT-12
										LT1086CT-3.6
										LT1086CT-5
										LT1086CT-12

2

LT1086 Series

ELECTRICAL CHARACTERISTICS

PARAMETER	CONDITIONS			MIN	TYP	MAX	UNITS
Reference Voltage	LT1086, LT1086H	IOUT = 10mA, TJ = 25°C, (VIN – VOUT) = 3V		1.238	1.250	1.262	V
(Note 2)		10mA £ IOUT £ 1.5A, (0.5A for LT1086H), 1.5V £ (VIN – VOUT) £ 15V	●	1.225	1.250	1.270	V
Output Voltage	LT1086-2.85	IOUT = 0mA, TJ = 25°C, VIN = 5V		2.82	2.85	2.88	V
(Note 2)		0V £ IOUT £ 1.5A, 4.35V £ VIN £ 18V	●	2.79	2.85	2.91	V
	LT1086-3.3	VIN = 5V, IOUT = 0mA, TJ = 25°C		3.267	3.300	3.333	V
		4.75V £ VIN £ 18V, 0V £ IOUT £ 1.5A	●	3.235	3.300	3.365	V
	LT1086-3.6	VIN = 5V, IOUT = 0mA, TJ = 25°C		3.564	3.600	3.636	V
		5V £ VIN £ 18V, 0 £ IOUT £ 1.5A	●	3.500		3.672	V
		4.75V £ VIN £ 18V, 0 £ IOUT £ 1A, TJ ³ 0°C		3.500		3.672	V
		VIN = 4.75V, IOUT = 1.5A, TJ ³ 0°C		3.300		3.672	V
	LT1086-5	IOUT = 0mA, TJ = 25°C, VIN = 8V		4.950	5.000	5.050	V
		0 £ IOUT £ 1.5A, 6.5V £ VIN £ 20V	●	4.900	5.000	5.100	V
	LT1086-12	IOUT = 0mA, TJ = 25°C, VIN = 15V		11.880	12.000	12.120	V
		0 £ IOUT £ 1.5A, 13.5V £ VIN £ 25V	●	11.760	12.000	12.240	V
Line Regulation	LT1086, LT1086H	ILOAD = 10mA, 1.5V £ (VIN – VOUT) £ 15V, TJ = 25°C			0.015	0.2	%
			●		0.035	0.2	%
	LT1086-2.85	IOUT = 0mA, TJ = 25°C, 4.35V £ VIN £ 18V			0.3	6	mV
			●		0.6	6	mV
	LT1086-3.3	4.5V £ VIN £ 18V, IOUT = 0mA, TJ = 25°C			0.5	10	mV
			●		1.0	10	mV
	LT1086-3.6	4.75V £ VIN £ 18V, IOUT = 0mA, TJ = 25°C			0.5	10	mV
			●		1.0	10	mV
	LT1086-5	IOUT = 0mA, TJ = 25°C, 6.5V £ VIN £ 20V			0.5	10	mV
			●		1.0	10	mV
	LT1086-12	IOUT = 0mA, TJ = 25°C, 13.5V £ VIN £ 25V			1.0	25	mV
			●		2.0	25	mV
Load Regulation	LT1086, LT1086H	(VIN – VOUT) = 3V, 10mA £ IOUT £ 1.5A, (0.5A for LT1086H)
		TJ = 25°C (Notes 1, 2)			0.1	0.3	%
			●		0.2	0.4	%
	LT1086-2.85	VIN = 5V, 0 £ IOUT £ 1.5A, TJ = 25°C (Notes 1, 2)			3	12	mV
			●		6	20	mV
	LT1086-3.3	VIN = 5V, 0 £ IOUT £ 1.5A, TJ = 25°C (Notes 1, 2)			3	15	mV
			●		7	25	mV
	LT1086-3.6	VIN = 5.25V, 0 £ IOUT £ 1.5A, TJ = 25°C (Notes 1, 2)			3	15	mV
		VIN = 5V, 0 £ IOUT £ 1A, TJ = 25°C	●		6	25	mV
					2	15	mV
			●		4	25	mV
	LT1086-5	VIN = 8V, 0 £ IOUT £ 1.5A, TJ = 25°C (Notes 1, 2)			5	20	mV
			●		10	35	mV
	LT1086-12	VIN = 15V, 0 £ IOUT £ 1.5A, TJ = 25°C (Notes 1, 2)			12	36	mV
			●		24	72	mV
Dropout Voltage	LT1086/-2.85/-3.3/-3.6/-5/-12 DVOUT, DVREF = 1%, IOUT = 1.5A (Note 3)		●		1.3	1.5	V
(VIN – VOUT)
	LT1086H	DVREF = 1%, IOUT = 0.5A (Note 3)	●		0.95	1.25	V

3

LT1086 Series

ELECTRICAL CHARACTERISTICS

PARAMETER	CONDITIONS			MIN	TYP	MAX	UNITS
Current Limit	LT1086/-2.85/-3.3/-3.6/-5/-12 (VIN – VOUT) = 5V		●	1.50	2.00		A
		(VIN – VOUT) = 25V	●	0.05	0.15		A
	LT1086H	(VIN – VOUT) = 5V	●	0.50	0.700		A
		(VIN – VOUT) = 25V	●	0.02	0.075		A
Minimum Load Current	LT1086/LT1086H	(VIN – VOUT) = 25V (Note 4)	●		5	10	mA
Quiescient Current	LT1086-2.85	VIN ≤ 18V	●		5	10	mA
	LT1086-3.3	VIN ≤ 18V	●		5	10	mA
	LT1086-3.6	VIN ≤ 18V	●		5	10	mA
	LT1086-5	VIN ≤ 20V	●		5	10	mA
	LT1086-12	VIN ≤ 25V	●		5	10	mA
Thermal Regulation	TA = 25°C, 30ms pulse				0.008	0.04	%/W
Ripple Rejection	f = 120Hz, COUT = 25μF Tantalum, IOUT = 1.5A, (IOUT = 0.5A for LT1086H)
	LT1086, LT1086H	CADJ = 25μF, (VIN – VOUT) = 3V	●	60	75		dB
	LT1086-2.85	VIN = 6V	●	60	72		dB
	LT1086-3.3	VIN = 6.3V	●	60	72		dB
	LT1086-3.6	VIN = 6.6V	●	60	72		dB
	LT1086-5	VIN = 8V	●	60	68		dB
	LT1083-12	VIN = 15V	●	54	60		dB
Adjust Pin Current	LT1086, LT1086H	TJ = 25°C			55		μA
			●			120	μA
Adjust Pin Current	LT1086, LT1086H	10mA ≤ IOUT ≤ 1.5A, (0.5A for LT1086H)
Change		1.5V ≤ (VIN – VOUT) ≤ 15V	●		0.2	5	μA
Temperature Stability			●		0.5		%
Long Term Stability	TA = 125°C, 1000 Hrs.				0.3	1	%
RMS Output Noise	TA = 25°C, 10Hz = ≤ f ≤ 10kHz				0.003		%
(% of VOUT)
Thermal Resistance	H Package: Control Circuitry/Power Transistor					15/20	°C/W
Junction-to-Case	K Package: Control Circuitry/Power Transistor					1.7/4.0	°C/W
	M Package: Control Circuitry/Power Transistor					1.5/4.0	°C/W
	T Package: Control Circuitry/Power Transistor					1.5/4.0	°C/W

The ● denotes the specifications which apply over the full operating temperature range.

Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead ≈1/8" from the package.

Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W (3W for the LT1086H). Power dissipation is determined

by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. See Short-Circuit Current curve for available output current.

Note 3: Dropout voltage is specified over the full output current range of the device. Test points and limits are shown on the Dropout Voltage curve. Note 4: Minimum load current is defined as the minimum output current required to maintain regulation. At 25V input/output differential the device is guaranteed to regulate if the output current is greater than 10mA.

4

		LT1086 Series
TYPICAL PERFORWAUCE CHARACTERISTICS
LT1086 Short-Circuit Current		Minimum Operating Current
	LT1086 Load Regulation	(Adjustable Device)

	2.5							0.10									10
			TJ = 150°C						DI = 1.5A							MINIMUM OPERATING CURRENT (mA)	9
							OUTPUT VOLTAGE DEVIATION (%)
SHORT-CIRCUIT CURRENT (A)	2.0							0.05									8
				TJ = 25°C
																	7
				TJ = –55°C				0
	1.5																6
								–0.05									5
	1.0							–0.10									4
																	3
	0.5		GUARANTEED					–0.15									2
	0	OUTPUT CURRENT						–0.20									1
		5	10	15	20	25	30		–25	0	25	50	75	100	125	150	0
	0							–50

INPUT/OUTPUT DIFFERENTIAL (V)	TEMPERATURE (°C)
LT1086 • TPC01	LT1086 • TPC02

		TJ = 150°C
		TJ = 25°C
		TJ = –55°C
0	5	10	15	20	25	30	35

INPUT/OUTPUT DIFFERENTIAL (V)

LT1086 • TPC03

OUTPUT VOLTAGE CHANGE (%)

Temperature Stability

2

1

0

–1

–2	–25	0	25	50	75	100	125	150
–50

TEMPERATURE (°C)

LT1086 • TPC04

ADJUST PIN CURRENT (μA)

Adjust Pin Current

100

90

80

70

60

50

40

30

20

10

0

–50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C)

LT1086 • TPC05

LT1086 Maximum Power

Dissipation*

	20
	15				LT1086MK
(W)						LT1086CT
POWER	10				LT1086CK
	5
	0	60	70	80	90	100 110 120 130 140 150
	50
			CASE TEMPERATURE (°C)

*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE

LT1086 • TPC06

RIPPLE REJECTION (dB)

LT1086 Ripple Rejection

100
90								V	RIPPLE £ 3VP-P										VRIPPLE £ 0.5VP-P
80
																	(VIN – VOUT) ³ 3V
70
60
		(VIN – VOUT) ³ VDROPOUT
50
40
30
20		CADJ = 200mF AT FREQUENCIES < 60Hz
10		CADJ = 25mF AT FREQUENCIES > 60Hz
		IOUT = 1.5A
0
		100
10															1k									10k							100k

FREQUENCY (Hz)

LT1086 • TPC07

LT1086 Ripple Rejection vs Current

	100
	90				fR = 120Hz
					VRIPPLE £ 3VP-P
(dB)	80
	70				fR = 20kHz
REJECTION	60				VRIPPLE £ 0.5VP-P
	50
RIPPLE	40
	30

20 VOUT = 5V

10CADJ = 25mF COUT = 25mF

0

0

0.25

0.5

0.75

1.0

1.25

1.5

OUTPUT CURRENT (A)

LT1086 • TPC08

RIPPLE REJECTION (dB)

LT1086-5 Ripple Rejection

80 VRIPPLE £ 3VP-P VRIPPLE £ 0.5VP-P

70

(VIN – VOUT) ³ 3V

60

50

(VIN – VOUT) ³ VDROPOUT

40

30

20

10

IOUT = 1.5A

0

10

100

1k

10k

100k

FREQUENCY (Hz)

LT1086 • TPC09

5