LT1084_15 Datasheet, PDF (8/22 Pages) Linear Technology – 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators

LT1083/LT1084/LT1085
Typical Performance Characteristics
Minimum Operating Current
10
9
8
7
6
5
T_J = 150°C
4
T_J = 25°C
3
2
1
T_J = –55°C
0
0 5 10 15 20 25 30 35
INPUT/OUTPUT DIFFERENTIAL (V)
LT1083/4/5 ADJ G10
LT1083
Ripple Rejection
100
90
V_RIPPLE ≤ 3V_P-P
V_RIPPLE
≤ 0.5V_P-P
80
(V_IN – V_OUT) ≥ 3V
70
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 = 7A
0
10
100
1k
10k
100k
FREQUENCY (Hz)
1083/4/5 ADJ G13
LT1084
Ripple Rejection
100
90
V_RIPPLE ≤ 3V_P-P V_RIPPLE ≤ 0.5V_P-P
80
(V_IN – V_OUT) ≥ 3V
70
60
50 ^{(VIN – VOUT) ≥ VDROPOUT}
40
30
20 CADJ = 200µF AT FREQUENCIES < 60Hz
10
C_ADJ = 25µF AT FREQUENCIES > 60Hz
I_OUT = 5A
0
10
100
1k
10k
100k
FREQUENCY (Hz)
1083/4/5 ADJ G16
Temperature Stability
1.27
1.26
1.25
1.24
1.23
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1083/4/5 ADJ G11
LT1083
Ripple Rejection vs Current
100
90
f_R = 120Hz
V_RIPPLE ≤ 3V_P-P
80
70 ^fR ^{= 20kHz}
V_RIPPLE ≤ 0.5V_P-P
60
50
40
30
20 VOUT = 5V
10
C_ADJ = 25µF
C_OUT = 25µF
0
01 2 34 56 7 8
OUTPUT CURRENT (A)
1083/4/5 ADJ G14
LT1084
Ripple Rejection vs Current
100
90
f_R = 120Hz
V_RIPPLE ≤ 3V_P-P
80
70 ^fR ^{= 20kHz}
V_RIPPLE ≤ 0.5V_P-P
60
50
40
30
20 VOUT = 5V
10
C_ADJ = 25µF
C_OUT = 25µF
0
0
1
2
3
4
5
OUTPUT CURRENT (A)
1083/4/5 ADJ G17
8
For more information www.linear.com/LT1083
Adjust Pin Current
100
90
80
70
60
50
40
30
20
10
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1083/4/5 ADJ G12
LT1083
Maximum Power Dissipation*
100
90
80
70
LT1083MK
60
50
40
30
LT1083CP
20
10
LT1083CK
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 G15
LT1084
Maximum Power Dissipation*
60
50
LT1084MK
40
30
LT1084CT
20
LT1084CP
10
LT1084CK
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 G18
108345fh