LTC3788 Linear Technology, LTC3788 Datasheet - Page 5

• Manufacturer Part Number: LTC3788
• Description: Dual Output Synchronous Boost Controller
• Manufacturer: Linear Technology

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TYPICAL PERFORMANCE CHARACTERISTICS
LOAD STEP
500mV/DIV
INDUCTOR
CURRENT
2A/DIV
5A/DIV
V
100
100
OUT
99
98
97
96
95
94
93
90
92
91
90
80
70
60
40
30
20
10
50
0
0.01
Effi ciency and Power Loss
vs Output Current
0
V
V
FIGURE 9 CIRCUIT
Effi ciency vs Input Voltage
Load Step
Burst Mode Operation
I
FIGURE 9 CIRCUIT
IN
OUT
V
LOAD
OUT
= 12V
= 24V
BURST EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
CCM EFFICIENCY
= 2A
= 12V
5
OUTPUT CURRENT (A)
V
INPUT VOLTAGE (V)
0.1
OUT
10
200μs/DIV
= 24V
15
V
V
FIGURE 9 CIRCUIT
IN
OUT
1
= 12V
= 24V
20
BURST LOSS
PULSE-SKIPPING
LOSS
CCM LOSS
3788 G05
3788 G03
10
25
10000
1000
100
10
1
0.1
3788 G01
LOAD STEP
LOAD STEP
500mV/DIV
500mV/DIV
INDUCTOR
INDUCTOR
CURRENT
CURRENT
2A/DIV
5A/DIV
2A/DIV
5A/DIV
V
V
100
OUT
0.00001
OUT
20
10
90
80
70
60
50
40
30
0
Effi ciency and Power Loss
vs Output Current
V
V
FIGURE 9 CIRCUIT
V
V
FIGURE 9 CIRCUIT
Load Step
Forced Continuous Mode
Load Step
Pulse-Skipping Mode
IN
OUT
IN
OUT
= 12V
= 12V
0.0001 0.001
= 24V
= 24V
BURST EFFICIENCY
BURST LOSS
OUTPUT CURRENT (A)
200μs/DIV
200μs/DIV
0.01
V
V
Burst Mode OPERATION
FIGURE 9 CIRCUIT
IN
OUT
= 12V
= 24V
0.1
1
3788 G06
3788 G04
3788 G02
10
1000
100
10
1
0.1
10000
LTC3788
5
3788f