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| LTC3853 Datasheet, PDF (5/36 Pages) Linear Technology – Triple Output, Multiphase Synchronous Step-Down Controller | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3853
Efï¬ciency vs Output Current
and Mode
100
90
80
70
BURST
60
50
DCM CCM
40
30
20
10
0
1.00E-02
VIN = 12V
VOUT = 1.8V
FIGURE 15 MODIFIED
WITH DCR SENSING
1.00E-01
1.00E+00
LOAD CURRENT (mA)
1.00E+01
3853 G01
Efï¬ciency vs Output Current
and Mode
100
90
80
BURST
70
60
50
CCM
40
DCM
30
20
10
0
1.00E-02
VIN = 12V
VOUT = 3.3V
FIGURE 15 MODIFIED
WITH DCR SENSING
1.00E-01
1.00E+00
LOAD CURRENT (mA)
1.00E+01
3853 G02
Efï¬ciency and Power Loss
vs Input Voltage
100
2.0
95
1.8
1.6
90
EFFICIENCY
1.4
85
1.2
80
1.0
75
POWER LOSS
0.8
0.6
70
65
VOUT = 3.3V
IOUT = 2A
0.4
FIGURE 15 MODIFIED 0.2
WITH DCR SENSING
60
0
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
3853 G03
Load Step
(Burst Mode Operation)
Load Step
(Forced Continuous Mode)
ILOAD
2A/DIV
ILOAD
2A/DIV
IL
2A/DIV
VOUT
100mV/DIV
AC COUPLED
VIN = 12V
40μs/DIV
VOUT = 3.3V
ILOAD = 0A TO 3A
FIGURE 15 CIRCUIT
3853 G04
IL
2A/DIV
VOUT
100mV/DIV
AC COUPLED
VIN = 12V
40μs/DIV
VOUT = 3.3V
ILOAD = 0A TO 3A
FIGURE 15 CIRCUIT
3853 G05
Load Step
(Pulse Skip Mode)
ILOAD
2A/DIV
IL
2A/DIV
VOUT
100mV/DIV
AC COUPLED
VIN = 12V
40μs/DIV
VOUT = 3.3V
ILOAD = 0A TO 3A
FIGURE 15 CIRCUIT
3853 G06
Inductor Current at Light Load
FORCED
CONTINUOUS
MODE
2A/DIV
Burst Mode
OPERATION
2A/DIV
PULSE SKIPPING
MODE
2A/DIV
VIN = 12
1μs/DIV
VOUT = 1.8V
ILOAD = 100mA
FIGURE 15 CIRCUIT
3853 G07
3853f
5
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