LT1083_05 Datasheet, PDF (6/16 Pages) Linear Technology – 7.5A, 5A, 3A Low Dropout Positive Adjustable Regulators

LT1083/LT1084/LT1085
TYPICAL PERFORMANCE CHARACTERISTICS
LT1085
Ripple Rejection
100
V_RIPPLE ≤ 3V_P-P
90
80
70
V_RIPPLE
≤ 0.5V_P-P
(V_IN – V_OUT) ≥ 3V
60
(V_IN – V_OUT) ≥ V_DROPOUT
50
40
30
20 CADJ = 200µF AT FREQUENCIES < 60Hz
10
C_ADJ = 25µF AT FREQUENCIES > 60Hz
I_OUT = 3A
0
10
100
1k
10k
FREQUENCY (Hz)
100k
1083/4/5 ADJ G19
LT1083
Load Transient Response
0.6
0.4
0.2
C_ADJ = 0
C_ADJ = 1µF
0
–0.2
C_IN = 1µF
–0.4
C_OUT = 10µF TANTALUM
8
V_OUT = 10V
6
V_IN= 13V
4
PRELOAD = 100mA
2
0
0
50
100
TIME (µs)
1083/4/5 ADJ G22
LT1083
Line Transient Response
150
100
C_ADJ = 0
50
C_ADJ = 1µF
0
– 50
–100
– 150
14
13
V_OUT = 10V
I_IN = 0.2A
C_IN = 1µF TANTALUM
C_OUT = 10µF TANTALUM
12
0
100
200
TIME (µs)
1083/4/5 ADJ G25
6
LT1085
Ripple Rejection vs Current
100
90
80 f_R = 120Hz
70 ^{VRIPPLE ≤ 3VP-P}
60
f_R = 20kHz
50 V_RIPPLE ≤ 0.5V_P-P
40
30
20 VOUT = 5V
10
C_ADJ = 25µF
C_OUT = 25µF
0
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
1083/4/5 ADJ G20
LT1084
Load Transient Response
0.6
0.4
C_ADJ = 0
0.2
C_ADJ = 1µF
0
–0.2
–0.4
C_IN = 1µF
C_OUT = 10µF TANTALUM
–0.6
6
4
V_OUT = 10V
2
V_IN = 13V
PRELOAD=100mA
0
0
50
100
TIME (µs)
1083/4/5 ADJ G23
LT1084
Line Transient Response
60
40
C_ADJ = 0
20
C_ADJ = 1µF
0
–20
–40
–60
V_OUT = 10V
I_IN = 0.2A
14
C_IN = 1µF TANTALUM
C_OUT = 10µF TANTALUM
13
12
0
100
200
TIME (µs)
1083/4/5 ADJ G26
LT1085
Maximum Power Dissipation*
50
40
LT1085MK
30
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
LT1085
Load Transient Response
0.3
0.2
C_ADJ = 0
0.1
C_ADJ = 1µF
0
–0.1
–0.2
C_IN = 1µF
C_OUT = 10µF TANTALUM
–0.3
3
2
V_OUT = 10V
V_IN = 13V
1
PRELOAD = 100mA
0
0
50
100
TIME (µs)
1083/4/5 ADJ G24
LT1085
Line Transient Response
60
40
C_ADJ = 0
20
C_ADJ = 1µF
0
–20
–40
–60
V_OUT = 10V
I_IN = 0.2A
14
C_IN = 1µF TANTALUM
C_OUT = 10µF TANTALUM
13
12
0
100
200
TIME (µs)
1083/4/5 ADJ G27
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