LT1963 datasheet(6/18 Pages) LINER

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LT1083/LT1084/LT1085 Fixed

1083ffe

For more information www.linear.com/LT1083

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Quiescent Current

LT1084-3.3

VIN = 18V

5.0

10.0

LT1085-3.3

VIN = 18V

5.0

10.0

LT1085-3.6

VIN = 18V

5.0

10.0

LT1083/4/5-5

VIN ≤ 20V

5.0

10.0

LT1083/4/5-12

VIN ≤ 25V

5.0

10.0

Thermal Regulation

LT1083-5/12

TA = 25°C, 30ms pulse

LT1084-3.3/5/12

LT1085-3.3/3.6/5/12

0.002

0.003

0.004

0.010

0.015

0.020

%/W

Ripple Rejection

f = 120Hz, COUT = 25µF Tantalum, IOUT = IFULL_LOAD (Note 4)

LT1084-3.3

f = 120Hz, COUT = 25µF Tantalum, IOUT = 5A, VIN = 6.3V

LT1085-3.3

f = 120Hz, COUT = 25µF Tantalum, VIN = 6.3V, IOUT = 3A

LT1085-3.6

f = 120Hz, COUT = 25µF Tantalum, VIN = 6.6V, IOUT = 3A

LT1083/4/5-5

VIN = 8V (Note 6)

LT1083/4/5-12

VIN = 15V (Note 6)

Temperature Stability

0.5

Long Term Stability

TA = 125°C, 1000 Hrs.

0.03

1.0

RMS Output Noise

(% of VOUT)

TA = 25°C,

10Hz = ≤ f ≤ 10kHz

0.003

Thermal Resistance

Junction-to-Case

Control Circuitry/Power Transistor (See Applications Information)

LT1083

K Package

P Package

0.6/1.6

0.5/1.6

°C/W

LT1084

K Package

P Package

T Package

0.75/2.3

0.65/2.3

0.65/2.7

°C/W

LT1085

K Package

T Package

DD Package

0.9/3.0

0.7/3.0

°C/W

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

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 IFULL_LOAD

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 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.

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

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

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