3

LT1585A/LT1585A-3.3

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Ripple Rejection

LT1585A

LT1585A-3.3

q

60

72

dB

Thermal

LT1585A

Regulation

LT1585A-3.3

0.004

0.02

%/W

Temperature Stability

q

0.5

%

Long-Term Stability

0.03

1.0

%

RMS Output Noise

0.003

%

Thermal Resistance

LT1585A

T Package: Control Circuitry/Power Transistor

0.7/3.0

°C/W

Junction to Case

ELECTRICAL CHARACTERISTICS

temperature range.

Note 1: 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 2: Line and load regulation are guaranteed up to the maximum power

dissipation 28.8W for the LT1585A in T package. Power dissipation is

determined by input/output differential and the output current. Guaranteed

maximum output power will not be available over the full input/output

voltage range.

LT1585A/LT1585A-3.3. The LT1585A has constant current limit with

changes in input-to-output voltage.

TEMPERATURE (

°C)

–0.20

–0.10

0

0.10

–0.15

–0.05

0.05

–25

25

75

125

LT1585A • TPC03

175

–50

–75

0

50

100

150

∆I = 5A

LT1585A Load Regulation

vs Temperature

OUTPUT CURRENT (A)

0

1.1

1.3

1.5

4

LT1585A • TPC01

0.9

0.7

1.0

1.2

1.4

0.8

0.6

0.5

1

2

3

5

T = –5

°C

T = 125

°C

T = 25

°C

GUARANTEED

TEST POINTS

LT1585A Dropout Voltage

vs Output Current

TEMPERATURE (

°C)

–75

5.0

5.5

125

LT1585A • TPC02

4.5

4.0

–25

25 50

175

6.0

75

–50

0

150

100

LT1585A Short-Circuit Current

vs Temperature