Datasheet
LT8609/LT8609A/LT8609B
5
Rev. H
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Efficiency (5V Output, Burst Mode
Operation)
Efficiency (3.3V Output, 2MHz,
Burst Mode Operation)
Efficiency (3.3V Output, 2MHz,
Burst Mode Operation)
Efficiency (5V Output, 2MHz,
Burst Mode Operation)
Efficiency (5V Output, 2MHz,
Burst Mode Operation) FB Voltage
L = 8.2µH
f
SW
= 700kHz
I
OUT
(mA)
0.001
0.01
0.1
1
10
100
1k
10k
0
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
8609 G04
V
IN
= 12V
V
IN
= 24V
I
OUT
(A)
0
0.5
1
1.5
2
2.5
3
50
55
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
8609 G05
V
IN
= 12V
V
IN
= 24V
L = 2.2µH
f
SW
= 2MHz
I
OUT
(mA)
0.001
0.01
0.1
1
10
100
1k
10k
0
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
8609 G06
V
IN
= 12V
V
IN
= 24V
L = 2.2µH
f
SW
= 2MHz
L = 2.2µH
f
SW
= 2MHz
I
OUT
(A)
0
0.5
1
1.5
2
2.5
3
50
55
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
8609 G07
V
IN
= 12V
V
IN
= 24V
I
OUT
(mA)
0.001
0.01
0.1
1
10
100
1k
10k
0
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
8609 G08
V
IN
= 12V
V
IN
= 24V
L = 2.2µH
f
SW
= 2MHz
TEMPERATURE (°C)
–50
–10
30
70
110
150
775
776
777
778
779
780
781
782
783
784
785
FB REGULATION VOLTAGE (mV)
8609 G09
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency (3.3V Output,
Burst Mode Operation)
Efficiency (3.3V Output,
Burst Mode Operation)
Efficiency (5V Output, Burst
Mode Operation)
L = 8.2µH
f
SW
= 700kHz
I
OUT
(A)
0
0.5
1
1.5
2
2.5
3
50
55
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
8609 G01
V
IN
= 12V
V
IN
= 24V
L = 8.2µH
f
SW
= 700kHz
I
OUT
(mA)
0.001
0.01
0.1
1
10
100
1k
10k
0
10
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
8609 G02
V
IN
= 12V
V
IN
= 24V
I
OUT
(A)
0
0.5
1
1.5
2
2.5
3
50
55
60
65
70
75
80
85
90
95
100
EFFICIENCY (%)
8609 G03
L = 8.2µH
f
SW
= 700kHz
V
IN
= 12V
V
IN
= 24V
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