Datasheet

LT8614
4
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TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency at 3.3V
OUT
Efficiency vs Frequency
Burst Mode Efficiency
vs Inductor Value
Reference Voltage
EN Pin Thresholds Load Regulation
Efficiency at 5V
OUT
Efficiency at 3.3V
OUT
Efficiency at 5V
OUT
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
100
85
1
2
2.5
8614 G01
60
90
95
80
0.5 1.5
3
3.5
4
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
f
SW
= 1MHz
L = 4.7µH
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
100
85
1
2
8614 G02
60
90
95
80
3
0.5 1.5
2.5
3.5
4
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
f
SW
= 1MHz
L = 2.2µH
LOAD CURRENT (mA)
0.01 0.1
40
EFFICIENCY (%)
50
60
70
80
1 10 100 1000
8614 G03
30
20
10
0
90
100
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
f
SW
= 1MHz
L = 4.7µH
LOAD CURRENT (mA)
0.01 0.1
40
EFFICIENCY (%)
50
60
70
80
1 10 100 1000
8614 G04
30
20
10
0
90
100
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
f
SW
= 1MHz
L = 4.7µH
SWITCHING FREQUENCY (MHz)
0.25
98
96
94
92
90
88
86
84
1.75 2.75
8614 G05
0.75 1.25
2.25
EFFICIENCY (%)
V
OUT
= 5V
I
LOAD
= 1A
L = 8.6µH
V
IN
= 12V
V
IN
= 24V
INDUCTOR VALUE (µH)
0
65
EFFICIENCY (%)
70
75
80
85
90
95
2 4 6 8
8614 G06
10
V
OUT
= 5V
I
LOAD
= 10mA
V
IN
= 12V
V
IN
= 24V
TEMPERATURE (°C)
–50
REFERENCE VOLAGE (V)
0.971
0.973
0.975
150
8614 G07
0.969
0.967
0.965
0.961
0
50
100
–25
25
75
125
0.963
0.979
0.977
TEMPERATURE (°C)
–50
EN THRESHOLD (V)
0.99
1.01
150
8614 G08
0.97
0.95
0
50
100
–25
25
75
125
1.03
0.98
1.00
0.96
1.02
EN RISING
EN FALLING
LOAD CURRENT (A)
0
–0.15
CHANGE IN V
OUT
(%)
–0.10
–0.05
0
0.05
1 2
3
4
8614 G09
0.10
0.15
0.5 1.5
2.5
3.5
V
OUT
= 5V
V
IN
= 12V
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