LTC3862 Datasheet, PDF (5/40 Pages) Linear Technology – Multi-Phase Current Mode Step-Up DC/DC Controller

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3862
Efficiency vs Output Current
100
V_OUT = 48V
95
90
85
V_IN = 35V
80
75
V_IN = 24V
70
65
V_IN = 12V
60
55
50
10
100
1000
LOAD CURRENT (mA)
10000
3862 G01
Efficiency and Power Loss vs
Input Voltage
96
4000
EFFICIENCY
95
3500
94
3000
93
POWER LOSS
2500
92
91
V_OUT = 48V
I_OUT = 1A
90
0
10
20
30
INPUT VOLTAGE (V)
2000
1500
40
3862 G02
Load Step
I_LOAD
5A/DIV
1A TO 5A
I_L1
5A/DIV
I_L2
5A/DIV
V_OUT
500mV/DIV
V_IN = 24V
V_OUT = 48V
500μs/DIV
Inductor Current at Light Load
SW1
50V/DIV
SW2
50V/DIV
3862 G03
I_L1
2A/DIV
I_L2
2A/DIV
V_IN = 12V
V_OUT = 48V
I_LOAD = 100mA
1μs/DIV
3862 G04
Quiescent Current vs Input
Voltage
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
4 8 12 16 20 24 28
INPUT VOLTAGE (V)
32 36
3862 G05
Quiescent Current vs Temperature
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3862 G06
Shutdown Quiescent Current vs
Input Voltage
45
40
35
30
25
20
15
10
5
0
4 8 12 16 20 24 28 32 36
INPUT VOLTAGE (V)
3862 G07
Shutdown Quiescent Current vs
Temperature
50
V_IN = 12V
40
30
20
10
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3862 G08
3862fb
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