Datasheet

LTC3859
8
3859fa
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step (Boost)
Burst Mode Operation
Load Step (Boost)
Pulse-Skipping Mode
Load Step (Boost)
Forced Continuous Mode
Inductor Current at Light Load
(Boost) Soft Start-Up (Boost)
Boost Regulated Feedback
Voltage vs Temperature
Effi ciency and Power Loss
vs Output Current (Boost)
Effi ciency
vs Output Current (Boost) Effi ciency vs Input Voltage (Boost)
OUTPUT CURRENT (A)
0.0001
EFFICIENCY (%)
POWER LOSS (mW)
100
90
70
50
30
10
80
60
40
20
0
10000
100
1
1000
10
0.1
1100.01
3859 G10
0.10.001
FIGURE 12 CIRCUIT
V
IN
= 5V, V
OUT
= 10V, V
BIAS
= V
IN
CCM EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
BURST LOSS
BURST
EFFICIENCY
CCM LOSS
PULSE-SKIPPING
LOSS
OUTPUT CURRENT (A)
0.0001
EFFICIENCY (%)
100
90
70
50
30
10
80
60
40
20
0
1100.01
3859 G11
0.10.001
V
IN
= 5V
FIGURE 12 CIRCUIT
V
BIAS
= V
IN
V
OUT
= 10V
V
IN
= 8V
INPUT VOLTAGE (V)
2
EFFICIENCY (%)
100
99
97
95
91
92
93
98
96
94
90
67891043
3859 G12
5
FIGURE 12 CIRCUIT
V
BIAS
= V
IN
V
OUT
= 10V
I
LOAD
= 2A
200µs/DIV
V
OUT
100mV/
DIV
AC-
COUPLED
I
L
5A/DIV
3859 G13
V
OUT
= 10V
V
IN
= 5V
FIGURE 12 CIRCUIT
200µs/DIV
V
OUT
100mV/DIV
AC-COUPLED
I
L
5A/DIV
3859 G14
V
OUT
= 10V
V
IN
= 5V
FIGURE 12 CIRCUIT
200µs/DIV
V
OUT
100mV/DIV
AC-COUPLED
I
L
5A/DIV
3859 G15
V
OUT
= 10V
V
IN
= 5V
FIGURE 12 CIRCUIT
2µs/DIV
FORCED
CONTINUOUS
MODE
Burst Mode
OPERATION
5A/DIV
PULSE-
SKIPPING
MODE
3859 G16
V
OUT
= 10V
V
IN
= 7V
I
LOAD
= 1mA
FIGURE 12 CIRCUIT
2ms/DIV
V
OUT3
2V/DIV
GND
3859 G17
V
IN
= 5V
FIGURE 12 CIRCUIT
TEMPERATURE (°C)
–45
REGULATED FEEDBACK VOLTAGE (V)
1.212
1.209
1.203
1.191
1.194
1.197
1.206
1.200
1.188
30 55 80 105 130–20
3859 G18
5