Datasheet

3
LT1585A/LT1585A-3.3
1585afa
PARAMETER CONDITIONS MIN TYP MAX UNITS
Ripple Rejection LT1585A f = 120Hz, C
OUT
= 100µF Tant., (V
IN
– V
OUT
) = 3V,
I
OUT
= 5A
LT1585A-3.3 f = 120Hz, C
OUT
= 100µF Tant., V
IN
= 6.3V,
I
OUT
= 5A
60 72 dB
Thermal LT1585A T
A
= 25°C, 30ms Pulse
Regulation LT1585A-3.3 T
A
= 25°C, 30ms Pulse
0.004 0.02 %/W
Temperature Stability 0.5 %
Long-Term Stability T
A
= 125°C, 1000 Hrs. 0.03 1.0 %
RMS Output Noise T
A
= 25°C, 10Hz f 10kHz 0.003 %
(% of V
OUT
)
Thermal Resistance LT1585A T Package: Control Circuitry/Power Transistor 0.7/3.0 °C/W
Junction to Case
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.
Note 3: I
FULL LOAD
is defined as the maximum value of output load current
as a function of input-to-output voltage. I
FULL LOAD
is equal to 5A for the
LT1585A/LT1585A-3.3. The LT1585A has constant current limit with
changes in input-to-output voltage.
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
TEMPERATURE (°C)
0.20
OUTPUT VOLTAGE DEVIATION (%)
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
DROPOUT VOLTAGE (V)
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
SHORT-CIRCUIT CURRENT (A)
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
ELECTRICAL CHARACTERISTICS
The denotes specificatons which apply over the specified temperature range, otherwise specifications are at T
A
= 25°C.