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LT8641
4
Rev B
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TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage
EFFICIENCY
POWER LOSS
1MHz, L = 3.3μH
2MHz, L = 2.2μH
3MHz, L = 1.5μH
LOAD CURRENT (A)
0.5
1
1.5
2
2.5
3
3.5
60
65
70
75
80
85
90
95
100
0
0.3
0.7
1.0
1.3
1.6
1.9
2.3
2.6
EFFICIENCY (%)
POWER LOSS (W)
vs Frequency
12V
IN
to 5V
OUT
Efficiency
8641 G01
L = WE–LHMI7050
EFFICIENCY
POWER LOSS
L = WE–LHMI7050
1MHz, L = 2.2µH
2MHz, L = 1.5µH
3MHz, L = 1µH
LOAD CURRENT (A)
0.5
1
1.5
2
2.5
3
3.5
60
65
70
75
80
85
90
95
100
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
EFFICIENCY (%)
POWER LOSS (W)
vs Frequency
12V
IN
to 3.3V
OUT
Efficiency
8641 G02
f
SW
= 1MHz
L = WE–LHMI7050, 4.7µH
EFFICIENCY
POWER LOSS
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
LOAD CURRENT (A)
0
0.5
1
1.5
2
2.5
3
3.5
50
55
60
65
70
75
80
85
90
95
100
0
0.3
0.5
0.8
1.0
1.3
1.5
1.8
2.0
2.3
2.5
EFFICIENCY (%)
POWER LOSS (W)
Efficiency at 5V
OUT
8641 G03
f
SW
= 1MHz
L = WE–LHMI7050, 2.2µH
EFFICIENCY
POWER LOSS
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
LOAD CURRENT (A)
0
0.5
1
1.5
2
2.5
3
3.5
50
55
60
65
70
75
80
85
90
95
100
0
0.3
0.5
0.8
1.0
1.3
1.5
1.8
2.0
2.3
2.5
EFFICIENCY (%)
POWER LOSS (W)
Efficiency at 3.3V
OUT
8641 G04
f
SW
= 1MHz
L = WE–LHMI7050, 4.7µH
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
LOAD CURRENT (mA)
0.01
0.1
1
10
100
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
Efficiency at 5V
OUT
8641 G05
LOAD CURRENT (mA)
0.01
0.1
1
10
100
20
30
40
50
60
70
80
90
100
EFFICIENCY (%)
Efficiency at 3.3V
OUT
8641 G06
f
SW
= 1MHz
L = WE–LHMI7050, 4.7µH
V
IN
= 12V
V
= 24V
V
IN
= 36V
V
IN
= 48V
V
OUT
= 3.3V
I
LOAD
= 1.5A
L = WE–LHMI7050, 4.7µH
V
IN
= 12V
V
IN
= 24V
SWITCHING FREQUENCY (MHz)
0.5
1.0
1.5
2.0
2.5
3.0
80
82
84
86
88
90
92
94
96
EFFICIENCY (%)
Efficiency vs Frequency
8641 G07
V
OUT
= 5V
I
LOAD
= 10mA
L = WE–LHMI7050
V
IN
= 12V
V
IN
= 24V
INDUCTOR VALUE (µH)
1
2
3
4
5
6
7
8
9
10
65
70
75
80
85
90
95
100
EFFICIENCY (%)
vs Inductor Value
Burst Mode Operation Efficiency
8641 G08
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
801
803
805
807
809
811
813
815
817
819
REFERENCE VOLTAGE (mV)
Reference Voltage
8641 G09
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