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LTC3853 Scheda tecnica(PDF) 5 Page - Linear Technology

Il numero della parte LTC3853
Spiegazioni elettronici  Triple Output, Multiphase Synchronous Step-Down Controller
PDF  36 Pages
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LTC3853 Scheda tecnica(HTML) 5 Page - Linear Technology

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LTC3853
5
3853fc
For more information www.linear.com/LTC3853
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current
and Mode
Efficiency and Power Loss
vs Input Voltage
Efficiency vs Output Current
and Mode
Load Step
(Burst Mode Operation)
Load Step
(Forced Continuous Mode)
INPUT VOLTAGE (V)
0
75
80
85
15
25
3853 G03
70
65
60
5
10
20
90
95
100
1.0
0.8
1.2
1.4
0.4
0.6
0.2
0
1.6
1.8
2.0
30
VOUT = 3.3V
IOUT = 2A
FIGURE 15 MODIFIED
WITH DCR SENSING
EFFICIENCY
POWER LOSS
40µs/DIV
VOUT
100mV/DIV
AC COUPLED
IL
2A/DIV
ILOAD
2A/DIV
3853 G04
VIN = 12V
VOUT = 3.3V
ILOAD = 0A TO 3A
FIGURE 15 CIRCUIT
40µs/DIV
VOUT
100mV/DIV
AC COUPLED
IL
2A/DIV
ILOAD
2A/DIV
3853 G05
VIN = 12V
VOUT = 3.3V
ILOAD = 0A TO 3A
FIGURE 15 CIRCUIT
Inductor Current at Light Load
Load Step
(Pulse Skip Mode)
40µs/DIV
VOUT
100mV/DIV
AC COUPLED
IL
2A/DIV
ILOAD
2A/DIV
3853 G06
VIN = 12V
VOUT = 3.3V
ILOAD = 0A TO 3A
FIGURE 15 CIRCUIT
1µs/DIV
Burst Mode
OPERATION
2A/DIV
FORCED
CONTINUOUS
MODE
2A/DIV
PULSE SKIPPING
MODE
2A/DIV
3853 G07
VIN = 12V
VOUT = 1.8V
ILOAD = 100mA
FIGURE 15 CIRCUIT
LOAD CURRENT (A)
0.01
0.1
1
10
40
50
60
70
80
30
20
10
0
90
100
3853 G01
BURST
DCM
CCM
VIN = 12V
VOUT = 1.8V
FIGURE 15 MODIFIED
WITH DCR SENSING
LOAD CURRENT (A)
0.01
0.1
1
10
40
50
60
70
80
30
20
10
0
90
100
3853 G02
BURST
DCM
CCM
VIN = 12V
VOUT = 3.3V
FIGURE 15 MODIFIED
WITH DCR SENSING



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