Linear Technology LT1085MK-5, LT1085IM-3.6, LT1085CK-12, LT1084MK-5, LT1084CT-5 Datasheet

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Linear Technology LT1085MK-5, LT1085IM-3.6, LT1085CK-12, LT1084MK-5, LT1084CT-5 Datasheet

FEATURES

■Three-Terminal 3.3V, 3.6V, 5V and 12V

■Output Current of 3A, 5A or 7.5A

■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

■Adjustable Versions Available

APPLICATIOUS

■High Efficiency Linear Regulators

■Post Regulators for Switching Supplies

■Constant Current Regulators

■Battery Chargers

DEVICE	OUTPUT CURRENT*

LT1083	7.5 Amps
LT1084	5.0 Amps
LT1085	3.0 Amps

*For a 1.5A low dropout regulator see the LT1086 data sheet.

LT1083/LT1084/LT1085 Fixed

3A, 5A, 7.5A Low Dropout

Positive Fixed Regulators

DESCRIPTIOU

The LT®1083 series of positive adjustable regulators are designed to provide 3A, 5A and 7.5A 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 output voltage to 1%. Current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions.

The LT1083 series devices are pin compatible with older three-terminal regulators. A 10 F output capacitor is required on these new devices; however, this is usually included in most regulator designs.

Unlike PNP regulators, where up to 10% of the output current is wasted as quiescent current, the LT1083 quiescent current flows into the load, increasing efficiency.

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

TYPICAL APPLICATIOU

5V, 7.5A Regulator

VIN ≥ 6.5V

LT1083-5

5V AT 7.5A

10 F

22 F*

TANTALUM

LT1083/4/5 TA01

*REQUIRED FOR STABILITY

INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V)

Dropout Voltage vs Output Current

0	IFULLLOAD/2	IFULLLOAD
	OUTPUT CURRENT (A)
		1083/4/5	TA02

LT1083/LT1084/LT1085 Fixed

ABSOLUTE

WAXIWUW

RATIUGS (Note 1)

Power Dissipation ..............................	Internally Limited
Input Voltage* ........................................................	30V
Operating Input Voltage
3.3V, 3.6V Devices ...........................................	20V
5V Devices .......................................................	20V
12V Devices .....................................................	25V
Operating Junction Temperature Range
“C” Grades	0°C to 125°C
Control Section ..............................	0°C to 125°C
Power Transistor ............................	0°C to 150°C
“M” Grades	–55°C to 150°C
Control Section ..........................	–55°C to 150°C
Power Transistor ........................	–55°C to 200°C

Storage Temperature Range ................	– 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................	300°C

*Although the devices maximum operating voltage is limited, (20V for a 3V, 5V device, and 25V for a 12V device) 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 input/output voltage differentials greater than 15V, a minimum external load of 5mA is required to maintain regulation.

PRECOUDITIOUIUG

100% Thermal Limit Functional Test.

PACKAGE/ORDER IUFORWATIOU

VIN

CASE IS

ORDER PART NUMBER

OUTPUT

LT1083CK-5

LT1084MK-5

LT1083CP-5

FRONT VIEW

LT1083CK-12

LT1084MK-12

TAB IS

LT1083CP-12

LT1083MK-5

LT1085CK-5

OUTPUT

LT1084CP-5

VIN

LT1083MK-12

LT1085CK-12

LT1084CP-12

GND

LT1084CK-5

LT1085MK-5

VOUT

K PACKAGE

LT1084CK-12

LT1085MK-12

GND

2-LEAD TO-3 METAL CAN

θJA = 35°C/W

P PACKAGE

OBSOLETE NOT

RECOMMENDED

3-LEAD TO-3P PLASTIC

θJA = 45°C/W

FOR NEW

DESIGNS

LT1084CT-3.3

FRONT VIEW

LT1085CM-3.3

TAB IS

VIN

LT1084CT-5

LT1085CM-3.6

FRONT VIEW

LT1084CT-12

LT1085IM-3.6

OUTPUT

TAB IS

VOUT

VIN

LT1085CT-3.3

OUTPUT

LT1085CT-3.6

GND

VOUT

LT1085CT-5

M PACKAGE

GND

LT1085CT-12

3-LEAD PLASTIC DD

θJA = 30°C/W*

T PACKAGE

*WITH PACKAGE SOLDERED TO 0.52IN2

3-LEAD PLASTIC TO-220

COPPER AREA OVER BACKSIDE GROUND

θJA = 50°C/W

PLANE OR INTERNAL POWER PLANE. θJA CAN

VARY FROM 20°C/W TO > 40°C/W DEPENDING

ON MOUNTING TECHNIQUE.

Consult factory for parts specified with wider operating temperature ranges.

LT1083/LT1084/LT1085 Fixed

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Output Voltage

LT1084-3.3

IOUT

= 0mA, TJ = 25°C, VIN

= 8V (K Package Only)

3.270

3.300

3.330

4.8V

≤ VIN ≤ 15V, 0 ≤ IOUT

≤ IFULLOAD (Notes 3, 4, 9)

●

3.235

3.300

3.365

LT1085-3.3

VIN = 5V, IOUT = 0mA, TJ = 25°C (K Package Only)

3.270

3.300

3.330

4.8V ≤ VIN ≤ 15V, 0 ≤ IOUT ≤ IFULLOAD (Notes 3, 4, 9)

●

3.235

3.300

3.365

LT1085-3.6

VIN = 5V, IOUT = 0mA, TJ

= 25°C (K Package Only)

3.564

3.600

3.636

5V ≤ VIN

≤ 15V, 0 ≤ IOUT

≤ IFULLOAD (Note 9)

●

3.500

3.672

5V ≤ VIN

≤ 15V, 0 ≤ IOUT

≤ IFULLOAD, TJ ≥ 0°C (Notes 3, 4, 9)

3.528

3.672

LT1085-3.6

5V ≤ VIN ≤ 15V, 0 ≤ IOUT ≤ 2.5A (Notes 3, 4, 9)

●

3.528

3.672

VIN = 4.75V, IOUT = 3A, TJ ≥ 0°C

3.350

3.672

VIN = 4.75V, IOUT = 2.5A, TJ ≥ 0°C

3.450

3.672

VIN = 4.75V, IOUT = 1.5A, TJ > 0°C

3.528

3.672

LT1083/4/5-5

IOUT = 0mA, TJ = 25°C, VIN

= 8V (K Package Only)

4.950

5.000

5.050

0 ≤ IOUT ≤ IFULLOAD, 6.5V

≤ VIN ≤ 20V (Notes 4, 6, 7, 9)

4.900

5.000

5.100

LT1083/4/5-12

IOUT = 0mA, TJ = 25°C, VIN

= 15V (K Package Only)

11.880

12.000

12.120

0 ≤ IOUT ≤ IFULLOAD, 13.5V

≤ VIN ≤ 25V (Notes 4, 6, 7, 9)

11.760

12.000

12.240

Line Regulation

LT1084-3.3

IOUT = 0mA, TJ = 25°C, 4.8V ≤ VIN ≤ 15V

0.5

●

1.0

LT1085-3.3

4.8V ≤ VIN ≤ 15V, IOUT = 0mA, TJ= 25°C

0.5

●

1.0

LT1085-3.6

4.8V ≤ VIN ≤ 15V, IOUT = 0mA, TJ= 25°C

0.5

●

1.0

LT1083/4/5-5

IOUT = 0mA, TJ = 25°C, 6.5V ≤ VIN ≤ 20V (Notes 2, 3)

0.5

●

1.0

LT1083/4/5-12

IOUT = 0mA, TJ = 25°C, 13.5V ≤ VIN ≤ 25V (Notes 2, 3)

1.0

●

2.0

Load Regulation

LT1084-3.3

VIN = 5V, 0 ≤ IOUT ≤ 5A, TJ = 25°C

●

LT1085-3.3

VIN = 5V, 0 ≤ IOUT ≤ 3A, TJ = 25°C

●

LT1085-3.6

VIN = 5.25V, 0 ≤ IOUT ≤ 3A, TJ = 25°C

●

LT1083/4/5-5

VIN = 8V, 0 ≤ IOUT ≤ IFULLLOAD, TJ = 25°C (Notes 2, 3, 4, 6)

●

LT1083/4/5-12

VIN = 15V, 0 ≤ IOUT ≤ IFULLLOAD, TJ = 25°C (Notes 2, 3, 4, 6)

●

Dropout Voltage

LT1084/5-3.3

VOUT = 33mV, IOUT = IFULL LOAD (Notes 5, 6)

●

1.3

1.5

LT1085-3.6

VOUT = 36mV, IOUT = IFULL LOAD (Notes 5, 6)

●

1.3

1.5

LT1083/4/5-5

VOUT = 50mV, IOUT = IFULL LOAD (Notes 5, 6)

●

1.3

1.5

LT1083/4/5-12

VOUT = 120mV, IOUT = IFULL LOAD (Notes 5, 6)

●

1.3

1.5

Current Limit

LT1083-5

VIN = 10V

●

8.0

9.5

LT1083-12

VIN = 17V

●

8.0

9.5

LT1084-3.3

VIN = 8V

●

5.5

6.5

LT1084-5

VIN = 10V

●

5.5

6.5

LT1084-12

VIN = 17V

●

5.5

6.5

LT1085-3.3/3.6

VIN = 8V

●

3.2

4.0

LT1085-5

VIN = 10V

●

3.2

4.0

LT1085-12

VIN = 17V

●

3.2

4.0

Note 6: For LT1083 IFULL LOAD TJ ≥ – 40°C.

LT1083/LT1084/LT1085 Fixed

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

PARAMETER	CONDITIONS			MIN	TYP	MAX	UNITS
Quiescient Current	LT1084-3.3	VIN = 18V	●		5.0	10.0	mA
	LT1085-3.3	VIN = 18V	●		5.0	10.0	mA
	LT1085-3.6	VIN = 18V	●		5.0	10.0	mA
	LT1083/4/5-5	VIN ≤ 20V	●		5.0	10.0	mA
	LT1083/4/5-12	VIN ≤ 25V	●		5.0	10.0	mA
Thermal Regulation	LT1083-5/12	TA = 25°C, 30ms pulse			0.002	0.010	%/W
	LT1084-3.3/5/12				0.003	0.015	%/W
	LT1085-3.3/3.6/5/12				0.004	0.020	%/W
Ripple Rejection	f = 120Hz, COUT = 25 F Tantalum, IOUT = IFULLLOAD (Note 4)
	LT1084-3.3	f = 120Hz, COUT = 25 F Tantalum, IOUT = 5A, VIN = 6.3V	●	60	72		dB
	LT1085-3.3	f = 120Hz, COUT = 25 F Tantalum, VIN = 6.3V, IOUT = 3A	●	60	72		dB
	LT1085-3.6	f = 120Hz, COUT = 25 F Tantalum, VIN = 6.6V, IOUT = 3A	●	60	72		dB
	LT1083/4/5-5	VIN = 8V (Note 6)	●	60	68		dB
	LT1083/4/5-12	VIN = 15V (Note 6)	●	54	60		dB
Temperature Stability			●		0.5		%

Long Term Stability	TA = 125°C, 1000 Hrs.				0.03	1.0	%
RMS Output Noise	TA = 25°C,
(% of VOUT)	10Hz = ≤ f ≤ 10kHz				0.003		%
Thermal Resistance	Control Circuitry/Power Transistor (See Applications Information)						°C/W
Junctrion-to-Case	LT1083	K Package				0.6/1.6	°C/W
		P Package				0.5/1.6	°C/W

	LT1084	K Package				0.75/2.3	°C/W
		P Package				0.65/2.3	°C/W
		T Package				0.65/2.7	°C/W
	LT1085	K Package				0.9/3.0	°C/W
		T Package				0.7/3.0	°C/W
		DD Package				0.7/3.0	°C/W

Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.

Note 2: See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing.

Note 3: Line and load regulation are guaranteed up to the maximum power dissipation (60W for the LT1083, 45W for the LT1084 (K, P), 30W for the LT1084 (T) and 30W for the LT1085). 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.

Note 4: IFULL LOAD is defined in the current limit curves. The IFULLLOAD curve is defined as the minimum value of current limit as a function of

input to output voltage. Note that the 60W power dissipation for the LT1083 (45W for the LT1084 (K, P), 30W for the LT1084 (T), 30W for the LT1085) is only achievable over a limited range of input to output voltage.

Note 5: Dropout voltage is specified over the full output current range of the device. Test points and limits are shown on the Dropout Voltage curve.

is 5A for – 55°C ≤ TJ ≤ – 40°C and 7.5A for

Note 7: 1.7V ≤ (VIN – VOUT) ≤ 25V for LT1084 at – 55°C ≤ TJ ≤ – 40°C. Note 8: Dropout voltage 1.7V maximum for LT1084 at

– 55°C ≤ TJ ≤ – 40°C.

Note 9: Full load current is not available at all input-output voltages. See Notes 3, 4, 6.

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