Datasheet

LTC3862-1
5
38621f
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency vs Output Current
Effi ciency and Power Loss
vs Input Voltage
Load Step Inductor Current at Light Load
Quiescent Current
vs Input Voltage
Quiescent Current vs Temperature
Shutdown Quiescent Current
vs Input Voltage
Shutdown Quiescent Current
vs Temperature
TEMPERATURE (°C)
–50
SHUTDOWN CURRENT (µA)
30
40
50
25 75 150
38621 G08
20
10
0
–25 0
50
100 125
V
IN
= 12V
LOAD CURRENT (mA)
EFFICIENCY (%)
38621 G01
100
80
85
90
95
60
65
70
75
40
45
50
55
10 1000 1000100
V
OUT
= 72V
V
IN
= 32V
V
IN
= 24V
V
IN
= 9V
INPUT VOLTAGE (V)
0
EFFICIENCY (%)
POWER LOSS (mW)
95
96
97
98
99
100
40
38621 G02
94
93
92
91
90
89
88
5000
4500
4000
3500
3000
2500
2000
1500
10 20 30
V
ON
= 72V
I
OUT
= 0.5A
EFFICIENCY
POWER LOSS
38621 G03
I
LOAD
1A/DIV
500mA
TO 1A
I
LOAD1
2A/DIV
I
LOAD2
2A/DIV
V
OUT
1V/DIV
V
IN
= 24V
V
OUT
= 72V
400µs/DIV
38621 G04
SW1
50V/DIV
SW2
50V/DIV
I
LOAD1
1A/DIV
I
LOAD2
1A/DIV
V
IN
= 24V
V
OUT
= 72V
I
LOAD
= 100mA
1µs/DIV
INPUT VOLTAGE (V)
8
QUIESCENT CURRENT (mA)
2.8
3.2
3.6
4.0
4.4
4.8
5.2
5.6
36
38621 G05
2.4
2.0
1.6
1.2
0.8
0.4
0
12 16 20 24 3228
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (mA)
1.85
1.90
150
38621 G06
1.80
1.75
1.70
1.65
1.60
1.55
1.50
–25 0 25 50 100 12575
INPUT VOLTAGE (V)
8
SHUTDOWN CURRENT (µA)
40
45
50
36
38621 G07
35
30
20
15
10
5
0
12 16 20 24 3228