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LT8705 Datasheet(PDF) 5 Page - Linear Technology

Part # LT8705
Description  60V PolyPhase Synchronous Boost Controller
PDF  38 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT8705 Datasheet(HTML) 5 Page - Linear Technology

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LTC3784
5
3784fb
For more information www.linear.com/LTC3784
Typical perForMance characTerisTics
Load Step
Burst Mode Operation
Load Step
Forced Continuous Mode
Load Step
Pulse-Skipping Mode
Efficiency and Power Loss
vs Output Current
Efficiency and Power Loss
vs Output Current
Efficiency vs Load Current
Inductor Currents at Light Load
Soft Start-Up
Regulated Feedback Voltage
vs Temperature
OUTPUT CURRENT (A)
40
50
60
70
80
10
3784 G01
30
20
10
0
90
100
10
100
1000
1
0.1
10000
0.01
0.1
1
BURST EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
FORCED CONTINUOUS
MODE EFFICIENCY
BURST LOSS
PULSE-SKIPPING
LOSS
FORCED CONTINUOUS
MODE LOSS
VIN = 12V
VOUT = 24V
FIGURE 10 CIRCUIT
OUTPUT CURRENT (A)
40
50
60
70
80
3784 G02
30
20
10
0
90
100
10
100
1000
1
0.1
10000
0.01
0.1
1
10
BURST EFFICIENCY
BURST LOSS
VIN = 12V
VOUT = 24V
Burst Mode OPERATION
FIGURE 10 CIRCUIT
0.0001 0.001
0.00001
INPUT VOLTAGE (V)
0
90
92
94
96
5
10
15
20
98
100
91
93
95
97
99
25
3784 G03
VOUT = 12V
VIN = 12V
ILOAD = 2A
FIGURE 10 CIRCUIT
VOUT = 24V
VOUT
500mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD STEP
5A/DIV
VIN = 12V
VOUT = 24V
LOAD STEP FROM 100mA TO 5A
FIGURE 10 CIRCUIT
200µs/DIV
3784 G04
VOUT
500mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD STEP
5A/DIV
VIN = 12V
VOUT = 24V
LOAD STEP FROM 100mA TO 5A
FIGURE 10 CIRCUIT
200µs/DIV
3784 G05
VOUT
500mV/DIV
INDUCTOR
CURRENT
5A/DIV
LOAD STEP
5A/DIV
VIN = 12V
VOUT = 24V
LOAD STEP FROM 100mA TO 5A
FIGURE 10 CIRCUIT
200µs/DIV
3784 G06
PULSE-
SKIPPING
MODE
Burst Mode
OPERATION
5A/DIV
FORCED
CONTINUOUS
MODE
VIN = 12V
VOUT = 24V
ILOAD = 200µA
FIGURE 10 CIRCUIT
5µs/DIV
3784 G07
0V
VOUT
5V/DIV
VIN = 12V
VOUT = 24V
FIGURE 10 CIRCUIT
2ms/DIV
3784 G08
TEMPERATURE (°C)
–60
1.209
15
3784 G09
1.200
1.194
–35 –10
40
1.191
1.188
1.212
1.206
1.203
1.197
65 90
140
115
TA = 25°C unless otherwise noted.



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