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LT1083/LT1084/LT1085

108345fe

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Load Regulation

(VIN – VOUT) = 3V

10mA

≤ IOUT ≤ IFULL LOAD

TJ = 25°C (Notes 2, 3, 4, 6)

0.1

0.3

●

0.2

0.4

Dropout Voltage

∆VREF = 1%, IOUT = IFULLLOAD (Notes 5, 6, 8)

●

1.3

1.5

Current Limit

LT1083

(VIN – VOUT) = 5V

●

8.0

9.5

(VIN – VOUT) = 25V

●

0.4

1.0

LT1084

(VIN – VOUT) = 5V

●

5.5

6.5

(VIN – VOUT) = 25V

●

0.3

0.6

LT1085

(VIN – VOUT) = 5V

●

3.2

4.0

(VIN – VOUT) = 25V

●

0.2

0.5

Minimum Load Current

(VIN – VOUT) = 25V

●

510

Thermal Regulation

TA = 25°C, 30ms Pulse

LT1083

0.002

0.010

%/W

LT1084

0.003

0.015

%/W

LT1085

0.004

0.020

%/W

Ripple Rejection

f = 120Hz, CADJ = 25µF, COUT = 25µF Tantalum

IOUT = IFULL LOAD, (VIN – VOUT) = 3V (Notes 6, 7, 8)

●

Adjust Pin Current

TJ = 25°C55

µA

●

120

µA

Adjust Pin Current Change

10mA

≤ IOUT ≤ IFULL LOAD

1.5V

≤ (VIN – VOUT) ≤ 25V (Note 6)

●

0.2

µA

Temperature Stability

●

0.5

Long Term Stability

TA = 125°C, 1000 Hrs

0.3

RMS Output Noise (% of VOUT)TA = 25°C

10Hz =

≤ f ≤ 10kHz

0.003

Thermal Resistance Junction-to-Case

Control Circuitry/Power Transistor

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

M, T Packages

0.7/3.0

°C/W

ELECTRICAL CHARACTERISTICS

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

dissapation (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 voltage

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.

Note 6: For LT1083 IFULL LOAD is 5A for – 55°C ≤ TJ < – 40°C and 7.5A for

TJ ≥ –40°C.

Note 7: 1.7V

≤ (VIN – VOUT) ≤ 25V for LT1084 at –55°C ≤ TJ ≤ –40°C.

Note 8: Dropout is 1.7V maximum for LT1084 at – 55

°C ≤ TJ ≤ –40°C.

The

● denotes the specifications which apply over the full operating

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

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