LT1083/LT1084/LT1085
TYPICAL PERFORMANCE CHARACTERISTICS
LT1085
Ripple Rejection
100
90
80
RIPPLE REJECTION (dB)
70
60
50
40
30
20
10
0
10
100
1k
10k
FREQUENCY (Hz)
100k
C
ADJ
= 200µF AT FREQUENCIES < 60Hz
C
ADJ
= 25µF AT FREQUENCIES > 60Hz
I
OUT
= 3A
(V
IN
– V
OUT
)
≥
V
DROPOUT
V
RIPPLE
≤
3V
P-P
V
RIPPLE
≤
0.5V
P-P
RIPPLE REJECTION (dB)
100
90
80
70
60
50
40
30
20
10
0
0
0.5
2.0
1.0
1.5
OUTPUT CURRENT (A)
2.5
3.0
V
OUT
= 5V
C
ADJ
= 25µF
C
OUT
= 25µF
f
R
= 120Hz
V
RIPPLE
≤
3V
P-P
(V
IN
– V
OUT
)
≥
3V
POWER (W)
LT1083
Load Transient Response
0.6
OUTPUT VOLTAGE
DEVIATION (V)
OUTPUT VOLTAGE
DEVIATION (V)
0.2
0
–0.2
–0.4
C
ADJ
= 0
C
ADJ
= 1µF
0.2
0
–0.2
–0.4
–0.6
C
ADJ
= 1µF
OUTPUT VOLTAGE
DEVIATION (V)
0.4
C
IN
= 1µF
C
OUT
= 10µF TANTALUM
V
OUT
=10V
V
IN
=13V
PRELOAD=100mA
LOAD CURRENT (A)
6
4
2
0
0
LOAD CURRENT (A)
6
4
2
0
0
50
TIME (µs)
100
1083/4/5 ADJ G23
LOAD CURRENT (A)
8
50
TIME (µs)
LT1083
Line Transient Response
150
OUTPUT VOLTAGE
DEVIATION (V)
OUTPUT VOLTAGE
DEVIATION (mV)
50
0
–50
C
ADJ
= 1µF
20
0
–20
–40
–60
C
ADJ
= 1µF
OUTPUT VOLTAGE
DEVIATION (mV)
100
C
ADJ
= 0
–100
V
OUT
= 10V
I
IN
= 0.2A
C
IN
= 1µF TANTALUM
C
OUT
= 10µF TANTALUM
–150
INPUT
DEVIATION (V)
INPUT
DEVIATION (V)
14
13
12
0
14
13
12
0
INPUT
DEVIATION (V)
100
TIME (µs)
6
U W
1083/4/5 ADJ G19
LT1085
Ripple Rejection vs Current
50
LT1085
Maximum Power Dissipation*
40
LT1085MK
30
f
R
= 20kHz
V
RIPPLE
≤
0.5V
P-P
20
LT1085CT
10
LT1085CK
0
50 60 70 80 90 100 110 120 130 140 150
CASE TEMPERATURE (°C)
* AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
LT1083/4/5 ADJ G21
1083/4/5 ADJ G20
LT1084
Load Transient Response
0.6
0.4
C
ADJ
= 0
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
3
2
1
0
LT1085
Load Transient Response
C
ADJ
= 0
C
ADJ
= 1µF
C
IN
= 1µF
C
OUT
= 10µF TANTALUM
C
IN
= 1µF
C
OUT
= 10µF TANTALUM
V
OUT
= 10V
V
IN
= 13V
PRELOAD=100mA
V
OUT
= 10V
V
IN
= 13V
PRELOAD=100mA
0
50
TIME (µs)
100
1083/4/5 ADJ G24
100
1083/4/5 ADJ G22
LT1084
Line Transient Response
60
40
C
ADJ
= 0
60
40
20
0
–20
–40
–60
14
13
12
LT1085
Line Transient Response
C
ADJ
= 0
C
ADJ
= 1µF
V
OUT
= 10V
I
IN
= 0.2A
C
IN
= 1µF TANTALUM
C
OUT
= 10µF TANTALUM
V
OUT
= 10V
I
IN
= 0.2A
C
IN
= 1µF TANTALUM
C
OUT
= 10µF TANTALUM
200
1083/4/5 ADJ G25
100
TIME (µs)
200
1083/4/5 ADJ G26
0
100
TIME (µs)
200
1083/4/5 ADJ G27
108345fe
LINER [ LINEAR TECHNOLOGY ]
